Question # 1

In quadratic equation f(x) = ax²,if a >0, then the graph of parabola

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Opens up

Opens down

close up

symmetric w.r.t.x.axis

If A is a skew-symmetric matrix of order n and P, any square matrix of order n.prove that P' AP is

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Skew-symmetric

Symmetric

Null

Diagonal

If Z = (1,2), then Z^-1= ?

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(0.2, 0.4)

(-0.2, 0.4)

(0.2, -0.4)

(-0.2, -0.4)

If A, G, H are the arithmetic, geometric and harmonic means between a and b respectively then A, G, H are in

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A. P.

G. P.

H. P.

None of these

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How many arrangements of the letters of the word MI SSI PPI, taken all together can be made?

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A ________ divides the plane into left and right half planes.

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Vertical line

Horizontal line

Non vertical line

Inequality

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Lies between 4 and 7

Lies between 5 and 9

Has no value between 4 and 7

Has no value between 5 and 9

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What is the conjugate of -7 -2i?

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-7 + 2i

7 + 2i

7 -2i

None of these

Period of tan 4x is ______

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A quadrilateral whose diagonals are perpendicular bisector of each other is

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Square

Rectangle

Rhombus

Parallelogram

Trapezium

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Set of whole number

Rational Numbers

Complex numbers

Whole numbers

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Period of Sine and Cosine function is

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π

2π

-π

-2π

The number of tangents to the circle x2+ y2 -8x -6y +9 =0 which pass through the point (3,-2) is

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2

1

0

None of these

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Principle of equality of fractions

Rule for product of fraction

Rule for quotient of fraction

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The set of real numbers is a subset of

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The set of natural numbers

The set of rational numbers

The set of integers

The set of complex numbers

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perpendicular vectors

concurrent vectors

parallel vectors

none of these

If aand bare two vectors then a+b =

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b + a

b - a

ab

a^ b

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The graph of a quadratic function is

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Circle

Ellipse

Parabola

Hexagon

The property used in -3 <-2 ⇒0 <1

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Commutative property

Additive property of inequality

Additive inverse

Additive identity

If | x | < 1, then the first two terms of (1 - x)^1/2are

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What is the probability of being born on Wednesday?

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1/7

1/2

1/3

1/8

If n is any positive integer then 2ⁿ> 2(n + 1) is true for all

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none of these

Geometrically the modulus of a complex number represents its distance from the

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Point (1,0)

Point (0,1)

Point (1,1)

Point (0,0)

If distance of (a,b) from x-axis is 2 then

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a = 2

b = 2

a = b

b = 4

A function of the form p(x)/Q(x) is called:

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Rational function

Logarithmic function

Exponential function

Hyperbolic function

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1/x

-x

2x

0.5 x

if f(x) = x³ -3x² +5x -1, then f(-√2)=

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7+7√2

3+3√2

-7-7√2

-3-3√2

If origin is the mid point of (a,3) and (5,b) then

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a = -5 , b = -3

a = 5 , b =3

a = -5 , b = 3

a = 5 , b = -3

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Both the roots of the equation (x - b) (x - c) + (x - c)(x - a) + (x - a)(x - b) = 0 are always

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Positive

Negative

Real

None of these

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A fraction in which the degree of the numerator is greater than or equal to the degree of the denominator is called

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A proper fraction

An improper fraction

An equation

An identity

(1, 2) is in the solution of the inequality

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2x + y > 8

2x + y < 6

2x - y > 1

2x + 3y < 2

The area bounded by y = x (x2 - 4) and below x - axis is

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4

0

-4

8

The points (5, 0, 2), (2, -6, 0), (4, -9, 6) and (7, -3, 8) are vertices of a

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Square

Rhombus

Rectangle

Parallelogram

24 can be written as a product of

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Odd factors

Even factors

Whole factors

Prime factors

The periods of the function f(x) = x[x] is

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1

2

Non periodic

None of these

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a tan(ax + b) + c

- a tan(ax + b) + c

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The set of all positive even integers is

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Not a group

A group w.r.t subtraction

A group w.r.t division

A group w.r.t multiplication

The area under the curve y = 1/x² between x = 1 and x =4 is:

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-25

0.75

-0.35

-10

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sin x + c

-sin x + c

cos x + c

-cos x + c

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A prime number

An integer

A whole number

An irrational number

Domain of 1+cot2θ=csc2θ is

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[0,π]

R-{x/x=nπ,n∈ z}

(-∞,+∞)

[-1,1]

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15

9

7

8

Digit in the unit place of the number 183! + 3¹⁸³

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7

6

3

0

Minor of an element a_ijis denoted by

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M_ij

A_ij

|A|

None of these

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x³+ 2x²- 3x + 5 is ______

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An equation

A polynomial

Proper rational fractions

Improper rational fractions

The equation x2+ y2- 8x+ 6y+ 25= 0 represents

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A circle

A pair of straight lines

A point

None of these

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quadrant I

quadrant II

quadrant III

quadrant IV

If A(a,b) lies on 3x +2y =13 and point B(b,a) lies on x-y =5 then equation of AB is

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x- y= 5

x+ y+ =5

x+ y= -5

5x +5y =21

The first three terms in the expansion of (1 - x)^-1are

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1 + x + x²

1 - x - x²

-1 -x +x²

1 - x + x²

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(0.90)^1/2is equal to

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0.99

0.90

0.80

0.88

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The line 2x +√6y =2 is a tangent to the curve x2 -2y2 =4 The point of contact is

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(√6,1)

(2,3)

(7,-2√6)

(4,-√6)

Co-ordinate of a point on the parabola y² = 8x whose focal distance is 4 are:

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(2 , 4)

(-2 ,-4)

(-2, 4)

(2,-4)

∫sin(ax+b) dx is equal to:

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1/2a cos (ax + b)

-1/a cos (ax +b)

1/a cos (ax +b)

1/a ln (ax + b)

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The proposition S(k+1) is true when ______ is true∀K∈N

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S(n)

S(k)

S(1)

S(k-1)

Derivative of a w.r.t x is

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0

1

x

cos 315° = ______

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A square matrix A for which A^t= A is called a

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Column matrix

Symmetric matrix

Skew-symmetric matrix

Row matrix

If P is a proposition then its negative is denoted by

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How many types of an equation

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1

3

2

None

The magnitude of vector a=i-3j+5k is:

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3

√35

√17

√35

The locus of the centre of a circle which touches two given circles externally is:

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a hyperbola

an ellipse

a circle

a parabola

The surface generated by lines, consists of two parts, called:

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vertex

apex

nappes

axis

The middle term of [1/x-x]¹⁰is

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-152

-252

371

-421

The angle between the vectors 3i + j - k and 2i - j + k is

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Which of the following integrals can be evaluated

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If f(x) = x²then f(2) is

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-2

2

4

-4

A dice is rolled. The probability that the dots on the top are greater than 4 is

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1/6

1/3

1/2

1

A function whose domain is a subset of natural numbers is called ______

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Identity function

Sequence

Onto function

Series

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AB is a vertical pole and C is its middle point. The end A is on the level ground and P is any point on the level ground other than A. the portion CB subtends and angleβat P. If AP : AB = 2 : 1 thenβ=

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Name the property used in 4 + 9 = 9 + 4

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Associative property of addition

Commutative property of addition

Distributive property

Additive identity

∀x,y∈R and x> 0 , y>0, if x > y

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None of these

In R the number of identity element w.r.t '+' is

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One

Two

Three

Four

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From an empty set

1

2

>2

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If p and q are two statements then their biconditional 'p if q' is denoted by

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If a statement S(n) is true for n = 1 and the truth of S(n) for n = k implies the truth of S(n) for = k + 1, then S(n) is true for all

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Real numbers n

Integers n

Positive integers n

None of these

When we expand (a + 2b)⁵then

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a⁵+ 10a⁴b + 40a³b²+ 80a²b³+ 80ab⁴+ 32b⁵

a⁵+ a⁴b + a³b²+ a²b³+ ab⁴+ b⁵

5a⁵+ 4a⁴b + 3a³b²+ 2a²b³+ 1 ab⁴+ b⁵

None

x = sin^-13, then the value of sin x is

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√(3/2)

3

Not possible

-1

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The set {-1, 1} is closed under the binary operation of

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Addition

Multiplication

Subtraction

Division

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(-1, 2)

(-1, 1)

(1, 2)

{-1}

In Antarctica ozone depletion is due to the formation of following compound

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Acrolein

Peroxy acetyl nitrate

SO₂and SO₃

Chlorine nitrate

Which one of the following is used as antifreeze in the radiator

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Methanol

Ethanol

Ethylene glycol

Glycerin

In Millikan method for determination of charge on electron the air in the chamber is ionized by

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Protons

Electric field

X-rays

a - particles

Alkanes are least reactive towards:

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Acids and bases

Reducing agents

Oxidizing agents

All of these

Carboxylic acids having carboxyl group one is called:

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Mono carboxylic acid

Di-carboboxylic acid

Tri carboxilic acid

Tetra carboxylic acid

Vinyl acetylene combines with HCl to form:

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Polyacetylene

Benzene

Chloroprene

Divinyl acetylene

Spontaneous reaction is such in which the system decreases its ______

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Energy

Free energy

Entropy

All

E₁mechanism is generally shown by

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1° - RX

2° - RX

3° - RX

None of these

The Electro-negatively difference for ionic bond must be greater than

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1.6

1.7

1.8

1.0

The reaction between fat and NaOH is called:

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Esterification

Hydrogenolysis

Fermentation

Sponification

As it passes into food chain, the concentration of DDT

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Remains same

Decreases

Increases

Unpredictable

Write the name of following compound

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5 - methyle - 2- hexene

2 - methyle hexene

4 - ethyle - 2 - methyle hexene

3 - ethyle - 3 - methyl hexene

Determination of atomic masses and invention of system of writing symbols was made by:

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J. Berzelius

Democritus

Dalton

None of above

Which of the following metals is sometimes found in native state in nature?

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Al

Cu

Fe

Mg

Which of the following sulphates is not soluble in water

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Sodium sulphate

Potassium sulphate

Zinc sulphate

Barium sulphate

Aldehydes are produce in atmosphere by

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Oxidation of secondary alcohols

Reduction of alkenes

Reaction of oxygen atoms with hydrocarbons

Reaction of oxygen atoms with ozone

In an experiment the concentration of a reactant 'A' is doubled the rate increases four times. If concentration in tripled, then rate increases nint times. Thus the rate is proportional to ______ of concentration of 'A'

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Square root

Square

Twice

Cube

Which is used as a coagulant:

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Ferric Salts

Potash alum

a and b both

Chlorine

Water pollution is mainly due to

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Sulphure dioxide

Carbon dioxide

Oxygen

Industrial discharges

When rate of forward reaction is equal to rate of backward reaction, then the equilibrium established is called

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Chemical equilibrium

Static equilibrium

Dynamic equilibrium

None of these

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The heat released is enthalpy of neutralization

The heat released is enthalpy of atomization

The heat released is enthalpy of sublimation

The heat released is enthalpy of formation

Essentialα-amino acids are those which are necessary in the diet

Which one is an essentialα-amino acids

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Alanine

Aspartic acid

Glycine

Tryptophan

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)

Although hydrogen resemble with the elements of group lA, IVA and Vll but it is usually placed in

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Group IA

Group IV A

Group VII

Group VIII

Ethyl bromide on treatment with alcoholic KOH gives

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Ethylene

Ethanol

Acetic Acid

Ethane

The colour of transition metal complexes is due to

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d-d transitions of electrons

Para magnetic nature of transition elements

Ionization

Loss of s-electrons

According to modern theory of chemical bonding atoms form bonds as it leads to a:

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Increase in energy.

No energy change.

Decrease in energy.

First decrease then increase in energy.

The most acidic of the following compounds is

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P₂O₃

Sb₂O₃

B₂O₃

As₂O₃

Which is not the poplar reaction

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Iodine can oxidise iron

Bromine can oxidise iron

Iodine can oxidise bromine

Iron can oxidise bromine

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Shift reaction toward forward direction

Shift reaction backward

Lower the value of K_c

No change in reaction

Which is litharge or massicot?

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PbO

Pb₂O

Pb₃O₄

PbO₂

Which is not state function

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Temperature

Enthaply

Entropy

Internal energy

Cannizzzaro's reaction is not given by:

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Formaldehyde

Acetaldehyde

Benzaldehyde

Trimethyl

0.1 MHCI has pH = 1.0, it is about 100 times stronger than acetic acid. Then pH of acetic acid will be

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0.1

2.0

1.3

3.0

Compounds X, Y and Z, all react with PCI₅to release hydrogen chloride, but only one of them reacts eith 2,4-dinitrophenylhydrazine reagent. Which one of the following combinations could be X, Y and Z

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Ketones are reduced to

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Primary alcohol

Secondary alcohol

Tertiary alcohol

All of these

Sulphur dioxide affects

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Cell wall

Plasmodesmata

All membrane systems

Nucleus

Carboxylic acids on complete reduction in the presence of Hi and red phosphorus gives:

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Esters

Alcohols

Alkanes

Aldehydes

The substance having highest conductivity at room temperature among the following is

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0.1 N HCl

0.1 N NaCl

Graphite

Glass

According to the periodic law, the chemical properties of the elements are periodic functions of their

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Density

Atomic number

Atomic mass

Mass number

When alkyl halides are heated with aqueous solution of ammonia at about 100°C, amines are formed. This reaction is known as

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Williamsons synthesis

GHoffmans reaction

Wurtz reaction

Clemensen reaction

Law of mass action states that rate of chemical reaction is directly proportional to the product of active masses of the reactants. The term active mass means

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Mass in grams converted to products

Number of moles

Number of moles per dm³of reactants

Total pressures of the reactants

Coligative properties are the properties of

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Dilute solution which behave as nearly ideal solutions

Concentrated solutions which behave as nearly non-ideal solution

Both (i) and (ii)

Neither (i) and (ii)

Which one of the following will have the maximum dipole moment

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CH₃F

CH₃Cl

CH₃Br

CH₃l

N₂ + O₂ ⇌2NO

The unit of K_c for tis reaction will be:

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No unit

mol^-2 dm^-3

mol^-1 dm^-3

mol^-2 dm⁺³

The fibre which is made from vinylidine chloride polymer is called

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Rayon fibre

Azlon fibre

Acetate fibre

Saran fibre

What is formed when oxalic acid is dehydrated by conc. H₂SO₄?

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C + CO₂

CO

CO₂

CO + CO₂

Acid rains are produced by

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Excess NO₂and SO₂from burining fossil fuels

Excess production of NH₃by industry and coal gas

Excess release of carbon monoxide by incomplete combustion

Excess formation of CO₂by combustion and animal respiration

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With H₂/Ni CH₃(CH₂)₅CH₂OH

With H₂/Ni CH₃(CH₂)₅CH₃

With NaBH₄ CH₃(CH₂)₅CH₂OH

With NaBH₄ CH₃(CH₂)₅CHO

Reaction of Griganard's reagent with CO₂gives:

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Aldehyde

Pri-alcohol

Sec-alcohal

Carboxylic acid

Which of the following brings about the conversion of starch into maltose

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Maltase

Zymase

Diatase

Invertase

Which of the following will affect the rate :

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First step of reaction.

Last step of reaction.

Rate determining step.

Fastest step.

In physical and chemical properties, transition elements show

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Similarities

Dissimilarities

Both of these

Somestimes similarities, sometimes dissimilarities

A macroscopic property of a system which describes the initial and final state of the system is called

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Physical property

Chemical property

Energy property

State function

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Q and R Q and R

R only Q and R

Q and R R only

Q only R only

Energy of electron in the infinite Bohr orbit of H-atom is

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0 KJ/mole

1 KJ/mole

-1 KJ/mole

-1313.32 KJ/mole

In zero order reaction, the rate is independent of :

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Temperature of reaction

Concentration ofreactants

Concentration of products

None of these.

Sometimes a yellow turbidity appears while passing H₂S gas even in the absence of II group radicals. This is because

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Sulphur is present in the mixture as impurity

IV group radicals are precipitated as sulphides

Of the oxidation of H₂S gas by some acid radicals

III group radicals are precipitated as hydroxides

Pick out the wrong statement. In electrochemical cell

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Electrons are released at anode

Cathode is regarded as negative electrode

Chemical energy is converted into electrical energy

Salt bridge maintains the electrical neutrality of the solution

The wave number of the light emitted by a certain source is 2 x 10⁶m^-1. The wavelength of this light will be

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500 nm

500 m

200 nm

5 x 10⁷m

The stability of acromatic compounds decreases with ------- in the no. of its resonance structure

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Decrease

Increase

Remain constant

Partially decreases

Sulphuric acid generates nitronium ion by reacting with

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Nitric acid

Nitrogen gas

Nitrous acid

Potassium nitrate

Which of the following salt is soluble in water

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CaCO₃

CaSO₄

MgSO₄

BaSO₄

In the atomic emission spectrum the lines which appear bright, appear dark in absorption spectrum because

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The radiations emitted in emission spectrum are absorbed in absorption spectrum

Atomic emission spectrum is continuous

Atomic absorption spectrum is continuous

Distance between the lines increases

Which of the following is not a fertilizer

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Nitrophos

Dolomite

Super phosphate of lime

Urea

Biodegradable pollutant is

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Plastic

Asbestos

Sewage

Mercury

Choose an answer

1, 5-pentadiene

Penta-1, 4-diene

1, 1-pentadiene

1, 4-pentene

Splitting of spectral lines when atoms are subjected to strong electric field is called:

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Zeeman effect.

Stark effect

Photoelectric effect.

Compton effect.

Ethanol is prepared in Pakistan form fermentation of:

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Starch

Sugar

Glucose

Molasses

The relative abundance of Pb isotopes is 1.5% Pb²⁰⁴, 23.6% Pb²⁰⁶, 22.6% Pb²⁰⁷, 52.3% Pb²⁰⁸The relative atomic mass of Pb is

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207.94

208.24

206.94

207.24

Platinum is poisoned by

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Arsenic

Silver

Argon

Zinc

96500 C electricity is passed through CuSO₄. The amount of copper precipitated is

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0.25 mole

0.5 mole

1.0 mole

2.00 mole

The temp. and pressure used for PVC polymerization is

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10°C and 10 atm

20°C and 20 atm

52°C and 9 atm

100°C and 10 atm

A filtration process could be very time consuming if it were not aided by a gentle suction which is developed:

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If the paper covers the funnel up to its circumstances

If the paper has got small sized pores in

If the stem of funnel is large so that it dips in to filtrate

If the paper fits tightly.

Which inorganic precipitate acts as semipermeable membrane?

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Calcium sulphate

Barium oxalate

Nickel phosphate

Copper ferrocyanide

The reaction of an alkyl halide with RCOOAg produces

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Ester

Ether

Aldehyde

Ketone

Alkanes are soluble in all except

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Benzene

Ether

Water

Carbon tetra chloride

The colour of transition metal complexes is due to:

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d-d transitions of electorns

Paramagnetic nature of transition

Ionization

Loss of s-electrons

Linear shape is associated with which set of hybrid orbitals

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sp

sp²

sp³

dsp²

The coinage metals are

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Ni, Pd, Pt

Cu, Ag, Au

Zn, Al, Pb

Fe, Si, Sn

Which of the following elements does not show variable oxidation states?

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Copper

Iron

Zinc

Titanium

Which one is a polymer compound?

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SO₂

CO₂

CH₄

PVC

The wave number of the line emitted is 109.678 x 10⁵m^-1in the Lyman series when electron transition occurs

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A molecular ion is formed by

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Passing a high energy electron beam through gaseous molecule

Dissolving a salt i dilute acid

Passing electric current through molten salt

Passing electricity through aqueous solutions

In a group form top to bottom, the hardness of alkali metals

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Remains unchanged

Increases

Decreases

None

Environmental pollution affects

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Biotic components

Plants only

Man only

Biotic and abiotic components of environment

Each vertical column of the periodic table includes elements with chemical characteristics that are in general

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Identical

Similar

Different

Similar as well as different

A solution of NaOH has pH = 13, then concentration of NaOH is

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10^-13M

10¹³M

10^-1M

10⁺¹M

The process in which orbitals of different energies and shapes mix with each other to give equivalent hybrid orbitals is called

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Isomerization

polymerization

Hybridization

Resonance

Which of the following will have the highest boiling point at 1 atm pressure?

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0.1 M NaCl

0.1 M Sucrose

0.1 M BaCl₂

0.1 M Glucose

Standard reduction of Zn = -0.76 V and that of Ni is -0.25 V. On coupling them by a salt bridge which of these will act as anode

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Salt bridge will act as anode

Zn will act as anode

Ni will act as anode

None of these

Which electronic configuration corresponds to an element of Group ||Z-A of the periodic table?

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1s², 2s² , 2p⁶, 3s², 3p¹

1s, 2s², 2p⁶, 3s², 3p⁶, 4s²

1s², 2s², 2p⁶

1s², 2s², 2p⁶, 3s², 3p³

What is the cause of water pollution

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Chemical and bacterial contents in live stock

The spilled oil in rivers and ponds

Wide spread use of pesticides

All of the above

The nature of positive ray depend on:

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The nature of electrode.

The nature of discharge tube.

The nature of residual gas.

All of above.

Polyester resins have special use in:

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Clothing

Paints

Emulsion

Floor covering

Butyric acid was named from butyrum means:

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Red out

Vinegar

Butter

Milk

All the elements of oxygen family are

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Non metals

Metalloids

Radioactive

Polymorphic

The formula of curprite is

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Cu₂S

Cus

Cu₂O

CuCO₃

Which element should have the greatest value for electronegativity when combined with hydrogen

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Na

Si

S

Cl

A combination of glucose and fructose is called:

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Sucrose

Table sugar

a and b

Lactose

The effect of applying a force on a moving body is to change

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its direction of motion only

its speed of motion only

both the direction and speed of motion

its inertia only

Wien's constant is measured in:

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Metre per kelviin

Metre kelvin

Kelvin per meter

Joules

Dynes

Referring to above figure, current in the coil P grows from zero to its maximum value:

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At the instant the switch is closed

At the instant the switch is opened

When switch is kept open

All of above

Neither of above

An axis of rotation

Choose an answer

Is a straight line

Is normal to the plane of rotation

Passes through pivot point O

All of them

The quantity F x t is called as

Choose an answer

momentum

velocity

acceleration

impulse

Which one is the least multiple:

Choose an answer

Pico

Femto

Nano

Atto

The force exerted by the fluid in a hydraulic pump on the piston is 10 cm², the fluid pressure on the piston is, in N/cm²

Choose an answer

20

200

2000

20,000

Radioactivity was discovered by:

Choose an answer

Becquerel

Marie curie

Pierre curie

All of them

None of these

The time period of pendulums of different lengths would be

Choose an answer

same

different

both of them

none of them

To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance

Choose an answer

5.07 pF

50 pF

0.507 pF

507 pF

The basic circuit element in a d.c. circuit is a/an

Choose an answer

Inductor

Resistor

Capacitor

Battery

The length contraction happens only

Choose an answer

Opposite to the direction of motion

along the direction of motion

perpendicular to the direction of motion

In any direction

The open loop gain of OP-AMP is of the order of

Choose an answer

10²

10³

10⁴

10⁵

Energy is not carried by

Choose an answer

Transverse progressive waves

Longitudinal vibration

Stationary waves

Electromagnetic

If the waves produced in a microwave oven are of wave-length 12 cm, then their frequency will be:

Choose an answer

2500 MHz

0.25 MHz

2500 KHz

None of these

Circular motion is an example of motion in:

Choose an answer

One dimension

Two dimensions

Three dimensions

None of these

Rate of flow can be expressed in

Choose an answer

litre/sec

litre-sec

sec/litre

sec/litre-m

The special theory of relativity is based on the

Choose an answer

one postulate

two postulates

three postulates

four postulates

The strength of magnetic field at certain points around a wire depends upon:

Choose an answer

Value of current passing

Distance from the current element

Color of the material

Both (A) and (B)

Both (B) and (C)

The maximum distance of body from mean position when body is executing SHM is called

Choose an answer

Time period

Displacement

Amplitude

Frequency

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

Choose an answer

2

3

5

6

The photon of radio-waves has energy of about

Choose an answer

1 Me V

1 Ke v

10^-10e v

10¹⁰e v

A ten ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts

Choose an answer

1310 W

670 W

810 W

1210 W

If both the inputs given to a gate ae 1 such that the output is 0, then it is:

Choose an answer

AND gate

NOR gate

OR gate

NOT gate

Both (A) and (C)

Boyle's law is applicable in

Choose an answer

Isochoric process

Isothermal process

Isobaric process

Isotonic process

For inducting emf in a coil the basic requirement is that:

Choose an answer

Flux should link the coil

Change in flux should link the coil

Coil should form a closed loop

Both B and C are true

An ideal voltmeter has:

Choose an answer

Zero resistance

Small resistance

Large resistance

Infinite resistance

Both A and B

When a vector is multiplied by a negative number, its direction:

Choose an answer

Remains the same

Changes

Changes by 180°

None of these

It is possible to recognize a person by hearing his voice even if he is hidden behind a solid wall. This is due to the fact that his voice

Choose an answer

Has a definite pitch

Has a definite quality

Has a definite capacity

Can penetrate the wall

When a mass 'm' is pulled slowly, the spring stretches by an amount x_o, then the work done will be

Choose an answer

W=Kx_o

W=1/2Kx_o

W=1/2Kx²_o

W=4Kx_o

The half life of uranium-238 is

Choose an answer

6.2 x 10⁹years

4.5 x 10⁹days

4.5 x 10⁹years

1.3 x 10⁶years

All trigonometric functions (sine, cosine, tangent etc) are positive in:

Choose an answer

1st quadrant

2nd quadrant

3rd quadrant

4th quadrant

Electric intensity at a place due to a charged conductor is a

Choose an answer

Scalar quantity

Vector quantity

Semi vector and semi scalar

Dimensionless quantity

Both A and D are true

The rate of decay of a radioactive substance

Choose an answer

decrease exponentially with time

decreases linearly with time

increases linearly with time

increases exponentially with time

A dirty carpet is to be cleaned by heating. This is in according with______law of motion.

Choose an answer

First

Second

Third

None of these

In velocity of a particle at an instant is 10 m/s and after 5s the velocity of the particle is 20 m/s. The velocity 3s before in m/s is

Choose an answer

8

4

6

7

Dimensions of velocity are

Choose an answer

[L]

[T]

[LT^-1]

[LT^-2]

In thermodynamics, internal energy is the function of

Choose an answer

temperature

pressure

state

none of them

Aerodynamics is a branch of:

Choose an answer

Hydrodynamics

Thermodynamics

Both of them

Statics

The machines which deals with the objects moving with velocities approaching that of light is called:

Choose an answer

Relativistic mechanics

Wave mechanics

Quantum

Statics mechanics

Michael Faraday is known by his work on

Choose an answer

Nuclear strong force

Gravitational force

Nuclear weak force

Electric force

None of these

Two vectors having different magnitudes:

Choose an answer

Have their directions opposite

May have their resultant zero

Cannot have their resultant zero

None of these

The R₁= infinity and R₂= 0, then the gain of non-inverting amplifier is

Choose an answer

zero

infinity

one

any one of these

A field in which the work done is moving a body along closed path is zero is called:

Choose an answer

Nuclear filed

Conservative field

Gravitational field

Non-conservative field

A piece of fuse wire melts when a current of 15 ampere flows through it. With this current. If it dissipates 22.5 W, the resistance of fuse wire will be

Choose an answer

Zero

10Ω

1Ω

0.10Ω

A wire is bent into a ring of radius R is given a charge q. The magnitude of the electrical field at the centre of the ring is

Choose an answer

Two

1/2

Zero

3/2

Nucleus consists of

Choose an answer

proton and neutron

protons and electron

electron and neutron

protons only

If every particle of the flow that passes a particular point, moves along the same path as followed by particles which passed the point earlier, then this flow is said to be

Choose an answer

turbulent

streamline

abrupt

none of them

Zirconia is classified as:

Choose an answer

Ceramic solid

Ionic compound

Metal

Either (A) or (B)

Either (B) or (C)

Substances that flow easily have

Choose an answer

large coefficient of viscosity

small coefficient of viscosity

either of them

none of them

The strength of magnetic field around the current conductor is

Choose an answer

Smaller near the conductor

Greater near the conductor

Greater at the large distance from the conductor

Constant near and away from the conductor

Rate of decay is actually described by.

Choose an answer

Half line

Decay constant

Mean life

Total life

None of these

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

Choose an answer

7.71 m s^-2

0.5m s^-2

0.15m s^-2

0.092m s^-2

In a moving coil galvanometer, the deflecting couple depends upon

Choose an answer

area of the coil

number of turns of coil

value of magnetic field

all of the above

Work done is lowering the bucket into the well is:

Choose an answer

Zero

Positive

Negative

None of these

A disc rolls down a hill and its speed at bottom is found to be 11.4 m/sec. Height of the hill is then nearly:

Choose an answer

10 m

12 m

13 m

15 m

The SI unit of magnetic induction is tesla which is equal to

Choose an answer

Newton/ampere-meter or N/A-m

Newton/ampere²-meter or N/A²-m

Newton/ampere²-meter² or N/A²-m²

Newton/ampere²-meter²or N/A²-m²

The unit of magnetic flux is

Choose an answer

Weber-m²

Weber-m³

Henry

Weber

Semi-conductor elements have atoms with

Choose an answer

2 valence electrons

3 valence electrons

4 valence electrons

5 valence electrons

The force acting on a charge moving in a magnetic field

Choose an answer

is perpendicular to the both magnetic field and direction of motion

is proportional to the magnetic of charges

vanishes when the motion is directly opposite to the direction of field

all of the above

A relationship between Gauses of magnetic induction and Tesla(T) is given by

Choose an answer

G 10^-3T

G = 10^-2T

G = 10^-4T

G = 10^-1T

The motion of a body in a straight line is the motion in

Choose an answer

one dimension

two dimension

three dimension

four dimension

In a capacitive circuit

Choose an answer

Current leads voltage by phase ofπ/2

Voltage leads current by phase ofπ/2

Current and voltage are in same phase

Sometime current and sometime voltage leads

An inertial frame of reference is that frame of reference in which

Choose an answer

a = 0

a > 0

a < 0

all of them

Crystal of germanium or silicon in its pure form at absolute zero acts as:

Choose an answer

A conductor

A semiconductor

an insulator

Both (A) and (C)

Both (A) and (B)

The fluid is incompressible, if itsdensity is

Choose an answer

zero

constant

very high

very small

Photoelectrons are emitted when ultraviolet light falls on:

Choose an answer

Casium

Silver

Potassium

Any of these

None of these

Amplitude in SHM is equivalent to ______ in circular motion

Choose an answer

Diameter

Radius

Circumference

None of these

If the stress increased beyond the elastic limit of the material. the deformation produced in the material will be

Choose an answer

permanent

temporary

either of them

none of them

Parallel vectors of same magnitudes:

Choose an answer

Are equal

Are unequal

When added give the some equal to zero

Give the answer equal to zero

An object undergoes SHM. Its maximum equilibrium positions:

Choose an answer

Maximum

Half of its maximum value

Zero

None

Step up transformer has a transformation ratio of 3:2. What is the voltage in secondary, if voltage in primary is 30V:

Choose an answer

45 V

15 V

90 V

300 V

Laplace formula is derived from

Choose an answer

Isothermal change

Adiabatic change

Isobaric change

None of these

Which one of the following is correct?

Choose an answer

V_o= 1.414 V_rms

I_ams= 1.414 I_o

VO = 10.70 Vrms

Both a and b

The nucleus left after the emission of some radiation is called:

Choose an answer

Parent nucleus

Daughter necleus

Mother necleus

Any of these

None of these

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

Choose an answer

Bohr

Rydberg

Planck

Rutherford

Coulomb

To see the minor details of the object by microscope, it should have:

Choose an answer

High magnifying power

High resolving power

Am objective of larger focal length

None of these

Nucleus of a hydrogen atom may contain:

Choose an answer

One neutron only

Two protons and one neutron

Two protons and two neutrons

Aany of above

One proton only

Root out of the conventional source of energy:

Choose an answer

Energy from biomass

Hydroelectric energy

Geothermal energy

None of these

The unit of flux density is also given by

Choose an answer

Weber/m²or Wb . m^-2

Weber/mor Wb . m

Weber/mor Wb . m^-1

Weber or Wb

The total energy of spring mass system is

Choose an answer

zero

changing with time

constant

none of them

The heat required to raise the temperature of one mole of the substance through 1 K is called

Choose an answer

heat capacity

specific heat capacity

molar specific heat

all of them

If the flow is incompressible and the flow is steady then the mass of the fluid through the pipe

Choose an answer

increases

decreases

becomes zero

is conserved

Work done is maximum when angle between force and displacement is:

Choose an answer

0°

90°

180°

None of these

Acceleration in a body is always produced in the directin of:

Choose an answer

Velocity

Weight

Force

Botha B and C

The property of light which does not change with the nature of the medium is:

Choose an answer

Frequency

Amplitude

Wavelength

None of these

An inkjet printer uses in its operation:

Choose an answer

Neutrons only

Mesons only

Positrons and photons

An electric charge

None of these

Graphs which are used to illustrate the variation of velocity of an object with time are called

Choose an answer

distance time graphs

speed time graphs

velocity time graphs

acceleration time graphs

Micheal Faraday and joseph Henry belong respectively to:

Choose an answer

USA and England

England and France

England and USA

USA and France

None of these

The Einstein's changes in length, mass and time are not observed in common life because

Choose an answer

We dont observer then seriously

The masses are too large

Their speed is too small than the speed of right

All of the above

Suppose the water flows out from a pipe at 3kg s^-1and its velocity changes from 5m s^-1to zero on striking the wall, then the force exerted by water on wall will be

Choose an answer

5 N

10 N

15 N

20 N

Neutron was disvovered by:

Choose an answer

Rutherford in 1920

Chadwick in 1922

Bohr in 1913

Compton in 1927

None of these

The total work done in moving the body up and then down through the same height in a gravitational field is equal to:

Choose an answer

mgh

Its wight

Weight X height

Zero

Electric flux is defined by the relation

Choose an answer

E.A.

E x A

E/A

none of these

The solids which has structure in-between order and disorder are called

Choose an answer

amorphous solids

polymeric solids

crystalline solids

all of them

Sadi carnot described an ideal heat engine in

Choose an answer

1820

1840

1860

1880

If the displacement of a body executing S.H.M is plotted against time, then the curve is known as

Choose an answer

frequency of S.H.M

period of S.H.M

wave form

none of them

Branch of physics which deals with the study of stars and galaxies is called:

Choose an answer

Solid state physics

Astrophysics

Molecular physics

Chemical physics

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

Choose an answer

2.9 s

3.0 s

6.6 s

9.6 s

Pair production is the phenomenon in which

Choose an answer

matter is converted into energy

energy is converted into matter

light is converted into electrical energy

electrical energy is converted into light

The wave nature of light was proposed by:

Choose an answer

Newton

Thomas Young

Huygen

None of these