Question # 1

If n is any positive integer then n! > 2^n-1for

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0

1

13

If a > 0,b > 0, c > 0 then the roots of the equation ax2+ bx + c =0 are

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Real and negative

Non-real with negative real parts

Real and positive

Nothing can be said

The consecutive terms of a progressions are 30, 24, 20. The next term of the progression is

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Four cards are drawn at random from a pack of 52 playing cards. The probability of getting all the four cars of the same suit is

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44/4165

22/4165

11/4165

None of these

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8

9

10

11

Z is the set of integers (Z.*) is a group with a * b = a +b +1, a,b ∈ G.then inverse of a is

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-a

a +1

-1-a

None of these

The maximum value of sinθcosθis

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1

1/2

1/4

1/6

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a sec(ax + b) + c

- a sec(ax + b) + c

The angle of depression of the point at a distance 70 meters from the foot of the tower from the top of the tower is 45^𝜊.The height of the tower is

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37m

97m

101m

70m

A circle which touches one side of a triangle externally and the other two sides produced is called ______

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In-circle

Circum cirle

Escribed circle

None of these

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A function from X to Y is written as

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f : X to Y

f : Y to Y

An A.P., a G.P. and a H.P. have the same first and last terms and the same odd numbers of terms, the middle terms of the three series are in

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A.P.

G.P.

H.P.

None of these

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π / 3

π / 4

π / 2

π

The function f : x→ y defined as f (x) =α∀x∈ X,α∈ y is called

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Constant function

Polynomial function

Identity function

Linear function

Find the next two terms of 7, 9, 12, 16,...

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18, 20

19, 22

20, 25

21, 27

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The negative square root of 9 can be written as:

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-√9

√9

√18

-√18

Let A and B be two sets. If every element of A is also an element of B then

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The law of tangents is ______

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A finite non-empty set

Null set

Both a and b

None of these

The sum if 1,3,5,7,9........ up to 20 terms is

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400

472

563

264

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0

90°

180°

360°

The maximum value of 12 sinθ-9 sin²θis x

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3

4

5

None of these

The multiplicative inverse of x such that x = 0 is

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-x

Does not exist

1/x

±1

the curve of the parabola y² = -4ax is symmetric with respect to

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x -axis

y - axis

Botha x and y- axis

None of thes

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none of these

The set of the first elements of the orders pairs forming a relations is called its

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Relation in B

Range

Domain

Relation in A

1st four terms of the expansion (1-x)^-2are

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1 + 2x + 3x²+ 4x³

3x²+ 2x + 1

1 + 3x + 4x²+ 5x³

None of these

Domain of 2 cos x is ______

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[-2, 2]

R

Negative real numbers

None of these

an - an-1 will be common difference in an A.P if

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n = 1∀n∈ N

n>1∧n∈N

n∈Z

None of the above

If a₁= 3, r = 2, then the nth term of the G.P. is

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2.3^n-1

3.2ⁿ

3.2ⁿ⁺¹

3.2^n-1

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Reflexive property

Symmetric property

Transitive property

Additive property

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0

1

E-radius corresponding to < B is

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Roots of the equation 9x²- 12x + 4 = 0 are

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Real and equal

Real and distinct

Complex

None of these

The function ø(x) is ananti derivativeof function f (x),x∈Df if

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ø′(x) =∫f(x)dx

ø(x) =∫f(x)dx

ø′(x) =f(x)

ø(x) =∫′(x)dx

The element range of sequence are called

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Series

progression

Members

Terms

An expression involving any of the symbols <,>,< or > is called

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equation

inequality

linear equation

identity

The span of a standard parabola depends upon

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x

a

y

y2

The value of k (k > 0) for which the equation x²+ kx + 64 = 0 and x²- 8x + k = 0 both will have real roots is

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8

-16

-64

16

Choose an answer

Improper rational fraction

Rational fraction

Proper rational fraction

None of above

The set of points {(x,y)|y = f(x),∀x∈} is called

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Relation

Graph of f

Function

All are correct

2x³+ 3x + 9 is a ______

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Polynomial of degree 3

Quadratic equation

Cubic equation

Polynomial of degree 2

Z is a

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Infinite set

Finite set

Singleton set

Set of all integers

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The quadratic formula is

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0

1

none of these

A cone is generated by all lines through a fixed point and the circumference of

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a Circle

an ellipse

a Hyperbola

None of these

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5

-5

none

The parabola y²= x is symmetric about

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x-axis

y-axis

Both x and y-axis

The line y = x

cos (α+β) + cos (α-β) =

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4 cosαcosβ

2 cosαcosβ

2 sinαsinβ

2 sinαcosβ

The graph of a quadratic function is

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Circle

Straight line

Parabola

Triangle

The probability that a person A will be alive 15 years hence is 5/7 and the probability that another person B will be alive 15 years hence is 7/9. Find the probability that both will be alive 15 years hence

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4/63

5/9

45/49

None of these

A sequence of number whose reciprocals form an arithmetic sequence is called

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Geometric sequence

Arithmetic series

Harmonic sequence

Harmonic series

The vertex of the equation y² = 4ax is:

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(2, -2)

(1,1)

(0 , 0)

(2 , 2)

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- cos x

sin x

- sin x

sec x

No term of a harmonic sequence can be

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0

1

2

3

The order of the matrix A is 3 x 5 and that of B is 2 x 3.The order of the matrix BA is

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2 x 3

3 x 2

2 x 5

5 x 2

Domain of sinθis

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Set of real numbers

Set of complex numbers

Set of natural numbers

Set of even numbers

The solution set of trigonometric equation contains

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one element

two elements

three elements

Infinite elements

If the circumference of a circle is divided into 360 congruent parts, the angle subtended by one part at the centre of the circle is

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1⁰

1'

1"

1 rad

If P, Q, R be the A.M., G.M., H.M. respectively between any two rational numbers a and b, then P - Q is

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sin^-1[-1/2] = ______

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A line segment whose end points lie on a circle is called

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The secant of the circle

The arc of the circle

The chord of the circle

The circumference of the circle

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2

4

8

16

Choose an answer

i =

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√1

√2

√-2

√-1

If n is any positive integer then 4ⁿ>3ⁿ+ 4 is true for all

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sin(a + β)+sin(a -β) =_____;

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2cosa cosβ

2sina cosβ

2cosa sinβ

-2sina sinβ

The general term of a sequence is denoted by

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a₁

a_n

n

s_n

Choose an answer

(x-1) is a factor of

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2x³-3x²+9

2x³-5x-8

48x^2-46x-9

x⁹-1

The set of real roots of the equation log_{(5x + 4)}(2x +3)³- log_{(2x + 3)}(10x²+ 23x + 12) = 1 is

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{-1}

{-3/5}

Empty set

{-1/3}

A square matrix A = [aij] is upper triangular when

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cij = 0

bij = 0

aij = 0 for all i > j

dij = 0

{0} is a

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Empty set

Singleton set

Zero set

Null Set

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0

-2

1

4

The roots of the equation ax²+ bx + c = 0 are complex/imaginary if

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b²- 4ac < 0

b²- 4ac = 0

b²- 4ac > 0

None of these

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110

220

1320

None of these

The range of function f(x)=-x2+2x-1 is

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R

(-∞,0]

(-∞,1]

[0,∞)

The identity element with respect to subtraction is

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0

-1

0 and 1

None of thes

If the trace of matrix A is 5, then the trace of the matrix 3A is

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3/5

5/3

8

15

Roots of the equation x²- 7x + 10 = 0 are

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{2, 5}

{-2, 5}

{2,5}

{-2,-5}

The period of|sin⁡2x| is

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π/2

-π/2

π

π/3

Choose an answer

1

12

5

29

If 2x^1/3+ 2x^-1/3= 5, then x is equal to

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1 or -1

2 or 1/2

8 or 1/8

4 or 1/4

(ABC)' =

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CBA'

CBA

C'B'A

C'B'A'

Choose an answer

perpendicular vectors

concurrent vectors

parallel vectors

none of these

In the expansion of (a + x)ⁿthe general term T_{r + 1}is

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Write the first four terms of the arithmetic sequence 5, 2, -1, ... is

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3

-4

7

1

If all members of a sequence are real numbers then it is called a

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Series

Function

Real sequence

Range

The point which is closet to the focus of a parabola is:

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vertex

Chord

Focus

Directix

The ellipse and hyperbola are called

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Concentric conics

Central conics

Both a b

None

If (2, 3) and (2, 5) are end points of a diameter of a circle, then the centre of the circle is

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(2, 4)

(4, 8)

(0, 2)

(0, -2)

Corrosion of iron can be prevented by coating the surface with

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Zn

Sn

Ni

Any of the above

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Coordination sphere may be:

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Cationic

Anionic

Neutral

All above

Which compound shows hydrogen bonding

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C₂H₆

C₂H₅CI

CH₃-O-CH₃

C₂H₅OH

Which of the following is not a synthetic polymer?

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Polyethylene

PVC

Nylon

Cellophane

Group l-A elements react with water fastly than the reaction of group ll-A elements because

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l_Aelements are more soft then ll_A

l_Aelements are non-metals

l_Aelements have 1 electron in their outermost s-orbital and are strongly electropositive

l_Aelements make ionic bond

Which alloy contains 50% copper, 25% zinc and 25% nickel

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German silver

Gun metal

Bell metal

Brass

When methane reacts with Cl₂in the presence of diffused light the products obtained are?

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Chloroform only

Carbon tetrachloride only

Chloromethane and dichloromethane

Mixture of a,b,c

What is the most common catalyst used in hydrogenation of oils

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Cobalt

Nickel

Tungsten

Copper

In a primary alkyl halide, the halogen atom is attached to a carbon which is further attached to

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Only one carbon atom

Two carbon atoms

Three carbon atoms

one or no carbon atom

At room temperature formaldehyde is

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Gas

Liquid

Solid

None of the above

The addition of HCN to carbonyl compounds is an example of

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Nucleopihlic substituion

Electrophilic addition

Nueleophilic addition

Electrophilic substitution

Which one of the following gases is used for artificial ripening of fruits

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Ethene

Ethane

Methane

Propane

If a reactant or product of a reaction absorbs radiation, then physical method for determining the rate of reaction is

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Spectrometry

Refractometry

Conductivity measurement

Optical method

Transition elements are called so because:

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Form interstital sompounds

have high m.p

In between 's' and' 'p' block elements

All of these

Cannizzaro reaction is not given by

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Trimethyl acetaldehyde

Acetaldehyde

Benzaldehyde

Formaldehyde

The depression of freezing point is directly proportional to

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Mole fraction of the solution

Molarity of the solution

Molality of the solution

Molarity of the solvent

Which of the following is produced when an aqueous solution of butan-2-ol is refluxed with dil acidified KMnO₄

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Butanol

Butanoic acid

Butanone

Butane

What is formed when propanone is refluxed with an anhydrous solution of NaBH₄

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Propanal

Propan-1-ol

Propan-2-ol

Propane

Weakest acid among the followings is

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Acetic acid

Phenol

Water

Acetylene

Choose an answer

32

64

16

4

Which isomer of C₅H₁₁OH gives, one dehydration, the greastest number of different alkenes

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The increase in size of the anion is due to:

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Increase in electron-electron repulsion

Increase in valence shell electrons.

Decrease in valence shell electrons.

Both (a) and (b).

According to Lewis concept ethers behave as:

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Acid

Base

Acid as well as a base

None of them

Homologues differ from each other by an integral number of

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CH₂groups

CH₃groups

CH groups

CH₄groups

When fused PbBr2 is electrolyzed :

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Lead appears at anode.

Lead appears at cathode.

Bromine appears at cathode.

Lead appears at both electrodes.

Water pollution is mainly due to

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Sulphure dioxide

Carbon dioxide

Oxygen

Industrial discharges

The hydrocarbon which is used as an illuminating agent

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Methane

Methene

Methyne

B & C

A polymeric substance that is formed in the liquid state and then hardened to a rigid solid is called:

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Fibre

Plastic

Vanish

Polyamide resin

One kilocalrie is equal to

Choose an answer

4.184 x 10³J

4.184 x 10⁴J

4.184 x 10²J

None of these

C₆H₁₂O₆and C₁₂H₂₂O₁₁ are:

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Mono-atomic molecules

Diatomic molecules

Poly-atomic molecules

Hetero atomic molecules

The element caesium bears resemblance with

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Ca

Cr

Rubidium

None of the above

Bronze is an alloy which contains

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60% cu

70% cu

80% cu

99% cu

Matter is defined as any thing which occupies space and:

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Molecules

Mass

Compound

Molecules

The trade name of polytetrafluoroethylene (PTFE) is

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Teflon

PVC

Terelene

Polyester

An alcohol with molecular formula C_nH_2n+1OH has a chiral carbon atom but does not react with MnO^-₄/H⁺what is the least number of carbon atoms such an alcohol could possess

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5

6

7

8

A sequence of how many nucleotides in massenger RNA makes a codon for an amino acid

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Three

Four

One

Two

Choose an answer

Electrophilic substitution

Free radical reduction

Isomerisation

Nucleophilic substitution

What mass of NaOH is required to prepare 2.5 dm³of 1.5 M NaOH solution

Choose an answer

130 g

140 g

150 g

160 g

1 mol of N₂O₄ was decomposed according to given equation in 1dm₃ container. At equilibrium x mole of N₂O₄ have dissociated. What is the value of K_C:

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2x/(1-x)²

4x²/(1-x)

4x/(1-x)

2x/(1-x)

Geographical survey of Pakistan estimates about billion tons of coal in Pakistan:

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182

183

184

185

The reactivity order of alkyl halides for a particular alkyl group is:

Choose an answer

F >Cl>Br>I

Cl>Br>F>l

l>Br>Cl>F

Br>l>Cl>F

Acetone reacts with HCN to form a cyanohydrin. It is an example of:

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Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

Direct conversion of solid intro vapours is called:

Choose an answer

Crystallization

Sublimation

Obligation

Vapourization

Choose an answer

Condensation

Electrophilic substitution

Free radical substitution

Nucleophilic substitution

Vant Hoff's factor of Ca(NO₃)₂is

Choose an answer

1

2

3

4

Water is often treated with chlorine to

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Increase oxygen content

Kill germs

Remove hardness

Remove suspended particles

An excess of aqueous silver nitrate is added to aqueous barium chloride and precipitate is removed by filtration. What are the main ion in filtrate?

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Ag⁺ and NO_3- only

Ag⁺ and Ba² and NO^-3

Ba² and NO^-3

Ba² and NO^-3and Cl-

Which element among the following belongs to Group IV-A of the periodic table?

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Barium

Iodine

Lead

Oxygen

Choose an answer

Forward reaction is favoured

Backward reaction is favoured

No effect

None of the above

Alkyl halides react with lithium dialkyl copper reagents to give

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Alkenes

Alkyl copper halides

Alkanes

Alkenyl halides

Surface and ground water sources are contaminated by various human activities. Which of the followings is not a human activity that causes contamination in fresh water

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Live stock waste

Oil leaks and spills

Disposal of industrial effluents

Rain

The quality of petroleum is determined by

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Decane number

Octane number

Nexane number

None of these

Charge on electron was discovered by:

Choose an answer

Millikan.

Crook.

Neil Bohr.

Rutherford.

In KO₂the oxidation state of oxygen is

Choose an answer

-2

-1

+1/2

-1/2

Which of the following elements is not present abundantly in earth's crust?

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Silicon

Aluminium

Sodium

Oxygen

Factors affecting quality of water:

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D.O

BOD

COD

All of these

The substances that are added to the soil to provide nutrient or assential elements required for plant growth, are called

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Additives

Fertilizer

Manures

Posticides

Aluminium oxide is:

Choose an answer

Acidic oxide

Basic oxide

Amphoteric oxided

None of these

Bakelite is a product formed form

Choose an answer

Reaction of formaldehyde with phenol

Reaction of polyethylene with phenol

Reaction of polypropylene with acid

It is a natural product

The general formula of amino acids is

Choose an answer

Partial pressure of a solution component is directly proportional to its mole fraction. This statement is known as

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Henry's law

Raoult's law

Distribution law

Ostwald's dilution law

On alkali and alkaline earth metals down the group, there is decreasing trend in

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m.p.

b.p.

Ionization potentiall

All of these

The nature of the positive rays depend on

Choose an answer

The nature of the electrode

The nature of the discharge tube

The nature of the residual gas

All of the above

Soil salinity can be measured by

Choose an answer

Calorimeter

Potometer

Porometer

Conducitvity meter

The element with atomic number 26 will be found in group

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2

8

6

10

Which one is used as a fuel for internal combustion engines in many European countries and Brazil

Choose an answer

C₂H₅OH

CH₃OH

CH₃COOH

C₂H₂

The saturated hydrocarbons usually end with suffix ______

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Ane

Ene

Yne

Oic

Atoms obey octet rule by sharing-electrons making covalent bonds according to

Choose an answer

Lewis and Kossal theory

Valance bond theory

VSEPR theory

Molecular orbital theory

A solution of two component is called

Choose an answer

Binary solution

Dilute solution

Original solution

Standard solution

Those amino acids which contain two carboxylic groups are called ______ amino acids

Choose an answer

Acidic

Basic

Neutral

None of these

The molecule of ethane possess which hybrization

Choose an answer

sp³

sp²

sp

sp²d

Who gave the concept of atomic number

Choose an answer

Newton

Mosley

Dalton

Newland

The rate of E₁reaction depends upon:

Choose an answer

The concentration of substrate

The concentration of nucleophile

The concentration of substrate as well as nucleophile

None of these

Which element has 4 unpaired electrons in 3d-orbital

Choose an answer

Chromium - 24

Manganese - 25

Iron - 26

Cobalt - 27

A certain current liberate 0.5 g of hydrogen in 2 h. How many grams of copper can be liberated by the same time in a copper sulphate solution?

Choose an answer

12.7 gm

15.9 gm

31.8 gm

63.5 gm

The relative atomic mass of chlorine is 35.5. What is the mass of 2 mol of chlorine gas

Choose an answer

142 g

71 g

35.5 g

18.75 g

A carbon atom carrying a postitive charge and attached to three other atoms of groups is called

Choose an answer

Caronium ion

Carbanion

Oconium ion

Carba ion

Soft drinks and baby feeding bottles are generally made up of

Choose an answer

Polyester

Polyurethane

Polyurea

Polystyrene

If we remove one hydrogen atom from an alkane we obtain a group called

Choose an answer

Acetyle group

Formyle group

Alkyle group

Ketyle group

The oxidation number of H is -1 in the compound

Choose an answer

H₂O

H₃BO₃

NaOH

NaH

At present oil refineries in Pakistan are:

Choose an answer

One

Two

Three

Four

Copper oxide is dedected by borax bead test with colour:

Choose an answer

Blue

Red

Yellow

Black

Monosaccharides and oligosacchradies are generally called as

Choose an answer

Crystals

Sugars

Liquids

Non-sugars

A compound having empirical formula C₃H₃O and its molecular mass is 110.02. Its molecular formula is

Choose an answer

C₃H₃O

C₆H₆O₂

C₉H₉O₃

C₃H₆O₂

Which functional group is present in glycerol tristearate

Choose an answer

Carboxylic acid

Alcohol

Aldehyde

Ester

A molecule in which sp²hybrid orbitals are used by the central atom in forming covalent bonds in

Choose an answer

He₂

SO₂

PCl₅

N₂

Which will have the maximum value of heat of hydration

Choose an answer

Na⁺

Cs⁺

Ba⁺²

Mg⁺²

Teflon, styron and neoprene are all

Choose an answer

Copolymers

Condensation polymers

Homopolymers

Monomers

The reaction between primary amine-chloroform and alcoholic caustic potash is called

Choose an answer

Wurtz reaction

Frankland reaction

Cannizzaro's reaction

Carbylamine reaction

Which reagent will distinguish a ketone from an aldehyde

Choose an answer

Br₂

2, 4-dinitrophenylhydrazine

NaBH₄

Tollen's reagent

The valence orbital configuration of an element with atomic number 23 is

Choose an answer

3d⁵

3d³, 4s²

3d³, 4s¹, 4p¹

3d²,4s²,4p¹

Which salt is used for preserving food

Choose an answer

CaCl₂

NaCl

Na₂SO₄

BaCl₂

How does the ionization energy of 1st group elements vary?

Choose an answer

Increases down the group

Decreases down the group

Remains unchanged

Variation is not regular

Self condensation of acetaldehyde in the presence of dilute alkalies gives

Choose an answer

An acetal

An aldol

Mesitylene

Propionaldehyde

Which statement about an atom is true ?

Choose an answer

The number of neutrons is not equal to number of electrons

Mass number is less than atomic number

All the elements have only one mass number

Mass number can be equal to atomic number

Basicity of orthoposphoric acid is

Choose an answer

2

3

4

5

Coal heated in the absence of air of about 500 - 1000°C is converted to

Choose an answer

Coke

Coal gas

Coal tar

All above

Benzene is obtained from benzene sulphonic acid by treating with

Choose an answer

HCl

NaOH

H₂O

NaHCO₃

For the above reaction the relationship b/w k_c and k_p will be :

Choose an answer

K_p = K_cRT

Kp = K_c(RT)_-1

K_p = K_c(RT)_-2

K_c = K_p

Which of the following is a polyamide?

Choose an answer

Nylon

Orlon

Teflon

Terylene

The rear wheels of an automobile are rev/sec which is reduced to 38 rad/sec in 5 seconds when brakes are applied. Its angular acceleration is:

Choose an answer

5 rad/sec²

-10 rav/sec²

-10 rad/sec²

-5 rav/sec²

Time period of a simple pendulum depends upon the

Choose an answer

length of the pendulum

acceleration due to gravity

none of them

both of them

When a conductoris moved across a magnetic field:

Choose an answer

Emf induced its similar to that of a battery

Emf induced gives rise to induced current

An emf is induced across its ends

All are correct

None of these

Centripetal acceleration is also called _______ acceleration:

Choose an answer

Tangential

Radial

Angular

None of them

In a charged capacitor the energy is stored in

Choose an answer

Both in positive and negative charges

Positive charges

The edges of the capacitor plates

The electric field between the plates

The state in which ice, water and vapour coexists in equilibrium is called

Choose an answer

zero degree celsius

zero degree fahrenheit

absolute zero

373 K

Another mean of electric potential energy per unit charge is given by:

Choose an answer

Electric intensity

Potential gradient

Electric Flux

Potential difference

None of these

when the deformation produced in the material become permanent, this type of behaviour is called

Choose an answer

proportionality

elasticity

plasticity

none of them

If force and displacement are in opposite direction, the work done is taken as

Choose an answer

Positive work

Negative work

Zero work

Infinite work

Direction of motion ______ in circular motion:

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Changes off and on

Changes continuously

Does not change

None of them

The mechanics, which deals with the objects moving with velocities approaching that of light is called

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Relativistic mechanics

Wave mechanics

Quantum mechanics

Statics

At what temperature the adiabatic change is equivalent to the isothermal change?

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Zero degree Celsius

Zero Kelvin

Critical temperature

Above critical temperature

When two progressive waves of nearly same frequencies superimpose and give rise to beats, then

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Frequency of beat changes with time

Frequency of beat changes with location of observer

All particles of medium vibrate simple harmonically with frequency equal to the difference between frequencies of component waves

Amplitude of vibration of particles at any point changes simple harmonically with frequency equal to difference between two component waves

The current of 1 ampere is passing through a conductor. The charge passing through it in half a minute is:

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One coulomb

0.5 coulomb

30 coulomb

2 coulombs

None of these

Such an inductor coil which does not consume energy and is often employed for controlling a.c. without consumption of energy is called

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Choke

impedance

Semi-conductor

None

The waveform of alternating voltage is a:

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Square

Rectangular

Saw-tooth

Sinusoidal

None of these

A 5 kg mass is falling freely, the force acting on, it will be

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19.6 N

9.8 N

5 N

Zero

Which one of the following can act approximately as a source of monochromatic light;

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Neon lamp

Fluorescent tube

Sodium lamp

None of these

A body is executing free vibrations when it oscilates

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with the interference of an external force

without the interference of an external force

with the interference of an internal force

none of them

Heavy water is made of one oxygen atom and two atoms of:

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Protium

Deuterium

Tritium

Any of these

None of these

The work performed on an object does not depend on

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Force applied

Angle at which force is inclined to the displacement

Initial velocity of the object

Displacement

With the propagation of a longitudinal wave through a material medium, the quantities transmitted in the propagation direction are

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Energy, momentum and mass

Energy

Energy and mass

Energy and linear momentum

An object in SHM will have maximum speed when its displacement from equilibrium position is:

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Infinity

Maximum

Zero

Minimum

Micheal Faraday and joseph Henry belong respectively to:

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USA and England

England and France

England and USA

USA and France

None of these

The product of force and time is called change in:

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Momentum

Impulse

Force

Both a and b

The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart, with force of repulsion between the spheres to be 10^-19N, is

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25

225

625

1250

By CAT scans, we can detect the density difference of the order of:

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1%

20%

30%

50%

70%

A coil of constant area is placed in a constant magnetic field. An induced current is produced in the coil when

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The coil is distorted

The coil is rotated

The coil is neither distorted nor rotated

Both A and B

None of these

The basic circuit element in D.C. circuit is:

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A capacitor

A resistor

An inductor

Both (A) and (C)

Both (A) and (B)

Sound waves in air always

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Longitudinal

Transverse

Stationary

Electromagnetic

According to the second law, which is must to produce work

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a source contains a large amount of heat energy

two sources at the same temperature

two sources at the different temperatures

a source contains a small amount of energy

Which one of the following could be the frequency of ultraviolet radiation?

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1.0 x 10⁶Hz

1.0 x 10⁹Hz

1.0 x 10¹²Hz

1.0 x 10¹⁵Hz

Conventionally, all the distance p, q, f are measured from _____ of the lens:

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Focus

Optical center

Edges

None of these

The number of translation degress of freedom for a diatomic gas is

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2

3

5

6

The example of reversible process is

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an explosion

changes occur suddenly

slow compression of a gas

all of them

Velocity of particle executing SHM will be maximum at

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Extreme position

Mean position

b/w mean and extreme

None

In the doping process, the ratio of the doping atoms to the semi conductor atom is

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1 to 10

1 to 10³

1 to 10⁶

1 to 10⁹

If the values of instantaneous and average velocities are equal, the body is said to be moving with

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uniform acceleration

uniform speed

variable velocity

uniform velocity

The body passing a viscous medium affected by:

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One force only

Two forces only

Four forces

None of these

The reverse saturation current in a PN junction diode is only due to

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Majority carriers

Minority Carriers

Acceptor ions

Donor ions

A body starting from rest covers a distance of 0.45 Km and acquires a velocity of 300 Kmh^-1. its acceleration will be

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7.71 m s^-2

0.5m s^-2

0.15m s^-2

0.092m s^-2

What are the SI base units of the coefficient of viscosity

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Kg m s^-2

kgm² s^-2

Kg m s^-1

kg m^-1s^-1

Diameter of the nucleus s of the order of

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10^-10m

10^-12m

10^-15m

10^-18m

When the droplet moves with terminal velocity in a fluid, the net force acting on the droplet is:

Choose an answer

F_D-mg

Zero

mg-F_D

None of these

The positive charge moving in one direction is equivalent in all external affects to a:

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Negative charge is moving in the same direction

Positive charge is moving in the opposite direction

Negative charge moving in the opposite direction

Positive charges moving in the same direction

None of these

The decrease in velocity per unit time is called:

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Variable Acceleration

Average Acceleration

Retardation

None of these

Least distance of distinct vision of an old man possibly becomes:

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A little less than 25 cm

A little more than 25 cm

Much less than 25 cm

None of these

The electrode connected with the positive terminal of the current source is called

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cathode

anode

electrolyte

position

The earth's potential is taken as

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Negative

Positive

Zero

Infinite

Which of the following types of force can do no work on the particle on which it acts

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Frictional force

Gravitational force

Electric force

Centripetal force

Phenomenon of radioactivity is due to disintegration of

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nucleus

neutron

proton

molecule

The combined effect of resistance and reactance in a.c. circuit is called

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conductance

resistance

impedance

choke

The motion in a plane is the motion in

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one dimension

two dimension

three dimension

four dimension

The law of conservation of energy gives us

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equation of continuity

Bernoulli's theorem

both of them

none of them

In the formula B= µ̻ nl, the symbol n denotes:

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Total number of turns of solenoid

Number of turns per unit length

Number of turns per unit volume

Numbers of turns per unit area

Number of moles

Most practical application of electricity involve

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Charges at the rest

Charges in the motion

Electrons at rest

Atoms in motion

Molecules in motion

Resolving power in mth order diffraction for grating is given by:

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R = N/m

R = m/N

R = N x m

None of these

When half of the cycle of a body executing S.H.M is completed, then the phase of the vibration will be

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45°

90°

135°

180°

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity

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Fringe width will decrease

Fringe width will increase

Fringe width will remain unchanged

Fringe will become less intense

A beam of electrons is provided by an

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electron gun

Suppray

Injection

None of these

The length contraction happens only

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Opposite to the direction of motion

along the direction of motion

perpendicular to the direction of motion

In any direction

Angle between the ray of light and the corresponding wavefront is:

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0°

60°

90°

120°

The device in which induced emf is statically induced emf is:

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Transformer

AC generator

Alternator

Dynamo

The ratio of velocity of sound in air at 4 atm pressure and that at 1 atm pressure would be

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1 : 2

4 : 1

1 : 4

2 : 1

The unit of decay constant is

Choose an answer

sex

sec²

sec^-1

sec^-2

The current produced by moving a loop of wire across a magnetic field is called:

Choose an answer

Direct current

Magnetic current

Alternating current

Induced current

None of these

In an ideal gas, the molecules have:

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Kinetic energy only

Potential energy only

Both KE and PE

None of these

In which of the following components, pn-junction is used

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light emitting diode

photo diode

photo voltaic cell

all of these

Computer chips are made from

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Conductors

Semiconductors

Insulators

Both A and B

The consumption source if energy is:

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Energy from blomass

Hydroelectric energy

Geothermal energy

None of these

Blood pressure is measured in torr. Which of the following units could belong to torr?

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N m^-1

N m^-2

N m

N^-1m^-2

For a body executing S. H. M, its

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momentum remains constant

potential energy remains constant

kinetic energy remains constant

total energy remains constant

Maximum height of a bullet when fixed at 30 with horizontal is 11 m. Then height when it is fired at 60° is

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22 m

6 m

33 m

7.8 m

Acceleration of body executing SHM is always directed towards

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Extreme position

Mean position

Along the direction of motion

None

Amplitude is the displacement of the vibrating body from:

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One extreme position to the other extreme position

Mean position any one extreme position

Both A and B are correct

None of these

The terms phase difference and path difference are:

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Same

Different

Equal

None of these

The most abundant isotope of neon is

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neon-20

neon-21

neon-22

neon-23

In an adiabatic process the work is done at the expense of the

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energy supplied to the system

energy gained from the surroundings

internal energy

none of them

Light year is a unit of:

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Time

Distance

Velocity

Intensity of light

The cause of mirage observed in deserts in bright sunlight is due to

Choose an answer

Refraction of light

Reflection of light

Scattering of light

Total internal reflection of light

The value of current at resonance in series LCR circuit is affected by the value

Choose an answer

R only

C only

L only

R, C and L

When the bob of simple pendulum is at extreme position, its K.E. will be

Choose an answer

maximum

minimum

zero

all of them

Which of the following diodes can operate in the reverse biased condition

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photo diode

light emitting diode

photo voltaic cell

none of these

Electric field lines emerge from the charges in

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One dimension

Two dimensions

Three dimensions

Four dimensions

None of these

A stone is tied to the end of a 20 cm along string is whirled in a horizontal circle.

if centripetal acceleration is 9.8 m/sec², then its angular velocity in rad/sec is:

Choose an answer

22/7

7

14

21

Swimming is based on the principle of

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Newton's 1st law

Newton's 2nd law

Newton's 3rd law

All

When some compass needles are placed on a card board along a circle with the center at the wire, they will

Choose an answer

Point the direction of N-S

Set themselves tangential to the circle

Point in the direction of E-W

None of these

Point in direction of S-E

When the conductor moved across a magnetic field:

Choose an answer

Emf induced is similar to that of a battery

Emf induced gives rise to induced current

An emf induced across its ends

All are correct

None of these

Due to relative motion of observer and the frame of reference of events, time always:

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Dilates itself

Contracts itself

Stretches itself

Both (A) and (C)

None of these

To observe interference of light, the condition, which must be met with is that the sources must be:

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Monochromatic

Phase coherent

Both of above

None of above

With the increase of temperature viscosity

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Increase

Decrease

Remains same

Doubles

The substance in which atoms cooperate with each other in such a way so as to exhibit a strong magnetic effect, are called

Choose an answer

diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

The blood pressure of a person

Choose an answer

decrease with age

increase with age

has no effect with age

none of them

When an object moves with a uniform angular velocity, then its instantaneous angular velocity is equal to:

Choose an answer

Zero

Its average velocity

Its angular displacement

None of these

According to Stoke's law, drag force depends on

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Initial velocity

Final velocity

Terminal velocity

Instantaneous velocity

The restoring force is always directed towards:

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Rest position

Equilibrium position

Mean position

All of them

The magnetic force exerted on an electron moving with velocity 'v' at right angle to the magnetic field is given by

Choose an answer

F=eVB

F=e²V/B

F=e/VB

F=B²/ev

The results of spectra obtained by Blamer were expressed in 1896 by

Choose an answer

Bohr

Rydberg

Planck

Rutherford

Coulomb

Consider a photon of continuous X-ray and a photon of characteristics X-ray of same wavelength. Which of the following is/are different for the two photons

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Frequency

Penetrating power

Energy

Method of creation

Which one is not produced by sound waves in air?

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Polarization

Diffraction

Refraction

Reflection

When the pn-junction is forward biased. the current flows through it is of the order of

Choose an answer

mili-amperes

amperes

nano-amperes

micro-amperes