Question # 1

A container has a small hole in the bottom.Air can go through this hole,but water cannot,this can be best explained by the statement that

Choose an answer

Water contains hydrogen atoms,air does not

Water molecules are larger than molecules in the air

Water molecules are smaller than molecules in the air

Surface tension of the water prevents it from

A particle of mass 0.5 g moving along x-axis is located at x₁= 15 m at t₁=5 s and x₂=33 m at t₂=13 s. Its average velocity is

Choose an answer

6 m s^-1

2.45 m s^-1

2.25 m s^-1

4.45 m s^-1

The total internal reflection takes place for glass-air boundary is then the angle is

Choose an answer

Equal to 41.8^o

Greater than 41.8^o

Less than 41.8^o

None of these

Power of a lens is equal to

Choose an answer

Focal length in meters

Reciprocal of focal length expressed in meters

Double the focal length

Half the focal length

In a diffraction fringes pattern the fringes are

Choose an answer

Equally spaced

Wider near the centre and narrower away from it

Narrower near the centre and Wider away from it

None of these

According o Einsteins theory space time is

Choose an answer

Just coordinates

A straight line

Curved

None of these

For a fixed force, larger is the mass of a body

Choose an answer

Greater acceleration

Small acceleration

Same acceleration

None of these

Two masses m₁ and m₂ have equal momentum their kinetic energies are in ratio of

Choose an answer

m₂: m₁

m²1 : m₂²

m₁: m₂

m₂^{2 :}m²1

The terms phase difference and path difference are:

Choose an answer

Same

Different

Equal

None of these

In a full wave rectifier with input frequency 50Hz. The frequency of pulsating D)C) received as an output across the load is

Choose an answer

50 Hz

100 Hz

500 Hz

zero

In light waves, the components of electric and magnetic fields are

Choose an answer

parallel to each other

anti-parallel to each

right angle to each other

none of them

Inkjet printer can produce

Choose an answer

Black and white copy

Coloured copy

Both

None of these

The terminal velocity of for a water droplet of radius 10^-5 m is of the order of

Choose an answer

1 cm/s

1 mm/s

1 nm/s

1 μm/s

Graham Bell photo phone used a modulated beam of

Choose an answer

Reflected sun light

Refracted sun light

Diffracted sun light

None of these

If the earth were to stop rotating, the value of 'g', the acceleration during to gravity at Delhi

Choose an answer

Increases

Decreases

Remains unchanged

Becomes zero

The ratio of stress/strain is called as

Choose an answer

Modulus of elasticity

Bulk modulus

Shear modulus

Young's modulus

The two vectors to be combined have magnitude 60 N and 35 N. Pick the correct answer from those given below and tell why is it the only one of the three that is correct.

(i) 100 N

(ii) 70 N

(iii) 20 N

Choose an answer

(i) is correct

(ii) 20 N

(iii) is correct

(ii) may be correct

The curie temperature of iron is called

Choose an answer

250°C

500°C

750°C

1000°C

If m means mass of gases ejected per second from a rocket and v shows the change in velocity, then mv is named as:

Choose an answer

Force

Energy

Work

Impulse

The law of thermodynamics which discusses the condition under which heat energy is converted into and equivalent amount of work is:

Choose an answer

1st

2nd

3rd

None of these

In petrol engine, the first stroke is the

Choose an answer

Power stroke

In take stroke

Exhaust stroke

None of these

The forbidden energy band gaps in conductors semiconductors and EG,EG₂ and EG₃respectively The relation among them is

Choose an answer

EG₁ = EG₂ = EG₃

EG₁ < EG₂ < EG₃

EG₁ > EG₂ > EG₃

EG₁ < EG₂ > EG₃

A diffraction grating of length 2cm has 4000 lines The grating element is

Choose an answer

0.5 x 10^-2 cm

5 x 10⁴

5 x 10^-4

0.5 x 10^-4 cm

When we consider the average velocity of a body, then the body is moving in

Choose an answer

straight line

curved line

may be in a straight or curved path

none of them

Remanance or Retentivity is the phenomenon in which the material still remains strongly magnetized when curve is

Choose an answer

Increase to maximum

Reduce to minimum

Reduce to zero

None of these

The unit of gain (G) for non-inverting amplifier is

Choose an answer

Ampere

ohm

Volt

None of these

A 120 m long train is moving in a direction with speed 20 m/s.A train B moving with 30 m/s in the opposite direction and 130 m long crosses the first train in a time

Choose an answer

6 s

36 s

38 s

None of these

Fire fighters have a jet attached to the head of their water pipes in order to

Choose an answer

Increase the mass flow per sec

Increase the volume flow per sec

Increase the velocity of water flowing out

Avoid wastage of water

When m₁>> m₂and V₂= 0, the result of their velocities are

Choose an answer

When torque acting on a system is zero which of the following is constant

Choose an answer

Force

Impulse

Angular momentum

Inertia

A charge of 10 C is moved along an equipotential surface having a potential of 2V. The work done is

Choose an answer

10 j

Zero

2 j

20 j

A current which demagnetize the material completely is called

Choose an answer

Applied current

Coercive current

Maximum current

None of these

Domains are present only in

Choose an answer

Diamagnetic material

Para magnetic material

Ferromagnetic material

All of these

The centripetal force for a car moving on a road is given by

Choose an answer

Friction due to tyres

Force of brakes

The driver of the car

Force by steering wheel

Alexander graham bell transmits a voice message via a

Choose an answer

Beam of light

Telescope

Compound microscope

Mirror

In time of flight, the body the covers the distance

Choose an answer

Maximum

Zero

Minimum

None of these

The minute hand of a large clock is 3.0 m long. What is its mean angular speed

Choose an answer

1.4 x 10^-4 rad s^-1

1.7 x 10^-3 rad s^-1

5.2 x 10^-3 rad s^-1

1.0 x 10^-1 rad s^-1

A boat which has a speed of 5 km/h in still water crosses a river of width 1 km along the shortest path in 15 minutes.The velocity of the river in km/s is:

Choose an answer

1

3

4

√41

Which of the following is the most common method to obtain polarized light?

Choose an answer

selective absorption

reflection from different surfaces

refraction through crystals

scattering by small particles

To produce same acceleration in the bodies of masses 10 kg and 20 kg the force applied in the second body should be

Choose an answer

Halved

Equal for both bodies

Doubled

Three times

If the slits in YDS experiment are made closer, fringe spacing will:

Choose an answer

Increase

Decrease

Remain same

None of above

Which of the following does not have the same units:

Choose an answer

Work

Heat

Kinetic energy

Power

A compound microscopes consists of objective of

Choose an answer

Very short focal length

Large focal length

Very large focal length

None of these

For keeping a body in circular motion,the force required is

Choose an answer

Centripetal

Centrifugal

Radial

Tangential

The cross product of two perpendicular vectors has magnitude

Choose an answer

Maximum value

Minimum value

Zero

None of these

When a strength changes the length of a body,it is called

Choose an answer

Tensile stress

Shear stress

Compressional stress

We are living in the age of

Choose an answer

Technology

Information technology

Space age

None of these

Which of the material is brittle ?

Choose an answer

Steel

Low carbon steel

High carbon steel

None of these

Inspite of different dispersion, all the wavelengths arrive at the other end of the fibre at the same time. With a step-index fibre overall time difference may be about

Choose an answer

40 ns

30 ns

32 ns

33 ns

One kilowatt hour is equal

Choose an answer

3.5 × 10⁵ J

3.6 × 10⁸ J

3.6 × 10⁶ J

3.5 × 10⁶ J

A ball is thrown with a speed of 30 ms^-1in a direction of 30° with the ground. What will be its horizontal range?

Choose an answer

40 m

60 m

80 m

100 m

The component of a vector has its direction as

Choose an answer

Same

Opposite

perpendicular

None of these

The substances which break just after the elastic limit is reached, are known as

Choose an answer

brittle substances

ductile substances

plastic substances

elastic substances

At systolic pressure, at the point the first surges of blood flow through the narrow stricture produces

Choose an answer

High flow speed

Sound heard

Initially turbulent

All of these

The travel time of light from Moon to Earth is

Choose an answer

2 min 10 sec

1 min

1 min 20 sec

3 min 30 sec

The motion of molecules in gases i:

Choose an answer

Orderly

Random

Circular

All of these

The saturation of the material reached when magnetic flux density changes from

Choose an answer

Zero to minimum value

Zero to maximum value

Maximum to zero value

Minimum to negative value

The value of the orbital radius measured for the centre of the Earth

Choose an answer

4.29 × 10⁵ km

4.23 × 10⁶ km

4.23 × 10⁴ km

4.23 × 10⁶ km

The velocity of light in vacuum can be changed by changing

Choose an answer

Frequency

Amplitude

Wavelength

None of these

The re conversion of light signals into electrical signals takes place due to

Choose an answer

Transmitter

Receiver

Generator

None of these

In the thin film, the path difference between the two reflecting waves depends upon

Choose an answer

thickness of film

nature of film

angle of incidence

all of them

When a stress changes the shape, it is called the

Choose an answer

compressional stress

tensile stress

shear stress

any one of them

The modulus of rigidity of a liquid is:

Choose an answer

Zero

1

Infinite

None of these

Thermal radiations are a type of:

Choose an answer

Mechanical waves

Electromagnetic waves

Alpha rays

Electrons

The two forces of a couple do not follow the rule that

Choose an answer

They act on the same angle

They act in the opposite directions

They have same directions

They cancel out each other

The binding energy per nucleon is:

Choose an answer

Greater for heavy nuclei

Least for heavy nuclei

Greatest for light nuclei

Greatest for medium nuclei

In coordinate axes the right ward forces are taken as

Choose an answer

Positive

Negative

Just units only

None of these

A result of the Bernoulli's equation is that the pressure will be low where the speed of the fluid is

Choose an answer

Low

High

Very high

None of these

The speed of a falcon in a dive is

Choose an answer

23 ms^-1

37 ms^-1

40 ms^-1

43 ms^-1

A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor The capacitor of the capacitor:

Choose an answer

Increases

Decreases

Remains unchanged

Becomes infinite

Weightlessness experienced by the spaceship is due to

Choose an answer

Absence of gravity

Absence of inertia

Free fall of spaceship

All of these

In projectile motion when a body is projected upward it must have

Choose an answer

Initial velocity

Angle θ < 90^o

Falling under gravity

All of these

Two lenses of power +12 and -2 diopters are placed in contact the power of combination is

Choose an answer

10 diopters

8 diopters

6 diopters

12 diopters

Ball pen functions on the principle of

Choose an answer

Viscosity

Boyle's law

Gravitational force

Surface tension

When crest of one wave falls on the crest of the other wave. This phenomenon is known as:

Choose an answer

Destructive interference

Diffraction

Polarization

Constructive interference

A visual representation of an electric field in terms of an electric field lines was proposed by

Choose an answer

Coulomb

Faraday

Gauss

Lenz

The cars usually have cylinders on the crankshaft are

Choose an answer

2

3

4

6

A convex lens of focal length 5 cm is used as magnifying glass Its magnifying power when the image is formed at infinity

Choose an answer

6

5

1.5

7

Substances which undergo plastic deformation until they break are called:

Choose an answer

Ductile

Brittle

Malleable

Soft

Hard

A valance band in solids is

Choose an answer

Always completely filled

Empty

Either completely or partially filled

None

The speed of efflux is equal to the velocity gained by the falling fluid under the action of gravity through a certain height is known as

Choose an answer

Equation of continuity

Bernoulli s equation

Torrucelli s Theorem

Venturi s relation

Focal length of convex lens is maximum for

Choose an answer

Blue light

Yellow light

Green light

Red light

A space ship has the radius of 9.8m. To produce an artificial gravity of 9.8m/sec² the spinning speed is

Choose an answer

9.8 m/sec

1 m/sec

19.6 m/sec

None of these

In launch mass of the rocket fuel is

Choose an answer

70%

80%

More than 80%

None of these

The capacity of a parallel plat capacitor depends on the

Choose an answer

Type of metal used

Thickness of plates

Potential applied across the plates

Separation between the plates

We can achieve polarization by

Choose an answer

Absorption

Reflection

Scttering

All of above

When a large number of atoms are brought close to one another to form a solid, each energy level of an isolated atom splits into sub-levels, called

Choose an answer

energy bands

energy shells

states

all of them

A diffraction pattern is obtained using a beam of red light What will happen if the red light is replaced by blue light?

Choose an answer

No change

Diffraction bands become narrower and crowded together

Bands become broader and farther apart

Bands disappear

Bending of light around sharp edges is known as

Choose an answer

Interference

Diffraction

Reflection

Dispersion

Keeping in view the Earth surface the value of g on the equator is

Choose an answer

Zero

Minimum

Maximum

None of these

If the distance of a surface from light source is doubled,then the luminance will become

Choose an answer

1/4 times

1/2 times

2 times

4 times

The forbidden energy gap in semiconductors

Choose an answer

Lies just below the valence band

Lies just above the conduction band

Is the same as the valence band

Lies between the valence band and conduction band

A limited region taken on a wavefront which is far away form the source is

Choose an answer

plane wavefront

circular wavefront

spherical wavefront

elliptical wavefront

Which of the following can become a good temporarily magnet?

Choose an answer

iron

steel

both of them

none of them

The charged nucleus of an atom itself spins, it's magnetic field

Choose an answer

equals the field produced by orbital electrons

greater than the field produced by orbital electrons

much weaker than the field produced by orbital electrons

none of them

Some charge is being given to a conductor.Then its potential

Choose an answer

Is maximum at surface

Is maximum at centre

Is remain same throughout the conductor

Is maximum somewhere between surface and centre

A science student takes 100 observations in an experiment Second time he takes 500 observations in the same experiment By doing so the possible error becomes

Choose an answer

5 times

1/5 times

Unchanged

None of these

Vector subtractions is made when vectors are just

Choose an answer

Added

First make it negative then add

Only make it negative

None of these

Electromagnetic waves emitted by hot bodies are called:

Choose an answer

Photoelectrons

Alpha rats

Thermal radiation

None of these

Amorphous materials have the properties of solids like

Choose an answer

No structure

Like liquid

Glassy

a and c

Three students measured the length of needle with a meter rod Which of the following is correct measurement

Choose an answer

0.2145 m

0.21 m

0.2142 m

None

The magnitude of X and Y component of P are 7 and 6.The magnitude of X and Y components of P + Q are 11 and 9 respectively. What is the magnitude of Q

Choose an answer

9

8

6

5

Viscosity of glycerin at 30^oC in Nsm^-2

Choose an answer

6.12 × 10^-3

6.18 × 10^-3

6.29 × 10^-3

6.79 × 10^-3

The total change in momentum of the isolated two ball system is

Choose an answer

Maximum

Minimum

Zero

None of these

The distance between the objective and eye-piece of a telescope in normal adjustment is

Choose an answer

f/₀-f_e

f₀+f_e

2f_e-f_e

None of these

The torque is zero when the angle between F and r is

Choose an answer

90^o

180^o

270^o

0^o

Torque is a physical quantity which is

Choose an answer

Scalar quantity

Vector quantity

Constant quantity

None of these

When the opposite faces of a rigid cube are subjected to shear stress, the shear strain produced is given by

Choose an answer

γ = Δa/a

tan θ

γ = θ

All of them

The transition from solid to liquid state is:

Choose an answer

Abrupt

Slow

Continuous

Discontinuous

Both A and D

The drag force increases as the speed of the object

Choose an answer

Decreases

Increases

Decreases rapidly

None of these

In YDS experiment, fringe spacing means the distance between two consecutive_____fringes:

Choose an answer

Bright

Dark

Any of A or B

None of these

First law of thermodynamic is generalization

Choose an answer

Law of conservation of mass

Law of conservation of energy

Law of heat exchange

None of these

When there are number of forces acting on a body and the body is

Choose an answer

At rest

Motion

Rest or moving with uniform velocity

None of these

Which of the following has no dimension

Choose an answer

Stress

Strain

Elastic modulus

Both strain and elastic modulus

Newtons first law of motion is also known as

Choose an answer

Law of motion

Law of mechanics

Law of inertia

None of these

A body of mass 1.0 kg is falling with an acceleration of 10 m/s² Its apparent weight will be (g = 10 m/s²)

Choose an answer

1.0 kg wt

2.0 kg wt

0.5 kg wt

Zero

The speed at which light travels within the material depends upon

Choose an answer

Refractive index of medium

Wavelength

Frequency

Intensity

A second pendulum is mounted in a rocket.Its period of oscillation decreases when the rocket

Choose an answer

Comes down with uniform acceleration

Moves round the earth in a geostationary orbit

Moves up with a uniform velocity

Moves up with uniform acceleration

When an electron is accelerated through a P.D of one volt it will acquire energy equal to

Choose an answer

One joule

One erg

One electron volt

None of these

If the power of a lens is 4 diopters then is focal length is

Choose an answer

20 cm

25 cm

50 cm

400 cm

In full wave rectification, the output D.C. voltage across the load is obtainedfor

Choose an answer

The positive half cycle of input A.C. (C) The complete cycle of input A.C.

The negative half cycle of input A.C.

The complete cycle of

All of the above

One poise = ___________.

Choose an answer

0.1 Nsm^-2

0.1 Pascal second

1.01 x 10⁵N

both A and B

A copper ball of radius r is moving with a uniform velocity v in the oil. The dragging force acting on the ball is F. The dragging force on the copper ball of radius 2r moving with uniform velocity 2v in the oil is

Choose an answer

F

2F

4F

8F

When a silicon crystal is doped with a pentavalent element, then the atom of the pentavalent element is known as

Choose an answer

acceptor

donor

either of them

none of them

The maximum energy of the photoelectrons depends upon:

Choose an answer

Frequency of incident light

Intensity of incident light

Nature of metal

Both (a) & (c)

Two equal, antiparallel and non-collinear forces are called

Choose an answer

Net force

Couple

Torque

None of these

Tick which of the following is not state variable:

Choose an answer

Heat energy

Pressure

Entropy

Volume

The value of g is maximum at

Choose an answer

The equator

The poles

The center of earth

Between poles and equator

A body is in complete equilibrium when

Choose an answer

ΣF = 0

Στ = 0

SF = 0 and Στ = 0

None of these

Newton published laws of motion in his famous book "principia" in

Choose an answer

1867

1667

1676

1687

The electric field due to an infinitely long thin wire at a distance R varies as

Choose an answer

1/R

1/R²

R

R²

Random error occurs when repeated measurements of the quantity under the same conditions gives

Choose an answer

Equal values

Different values

Increasing values

None of these

SI unit of angular moment is

Choose an answer

Kgms^-1

Kgm²s^-2

Kgm²s^-1

Kgm³s^-1

In an interference fringes pattern the fringes are

Choose an answer

Equally spaced

Wider near the centre and narrower away from it

Narrower near the centre and wider away from it

None of these

In photo phone modulated beam of reflected sun light focused on a detector several hundred meters away with the divice

Choose an answer

Germanium

Selinium

Silicon

None of these

Which row is correct for fission and for fusion?

Choose an answer

Produces larger nuclei

Produces smaller nuclei

Minimum number of unequal forces whose vector sum can be zero is

Choose an answer

3

4

2

5

How many types of the optical fibres are

Choose an answer

One

Two

Three

Four

The internal energy is similar to the

Choose an answer

Gravitational potential energy

Kinetic energy

Mechanical energy

None of these

Which of the following statement about centripetal and centrifugal force is correct

Choose an answer

They are oppositely directed

They cancel each other

Both are on the same body

None of these

Energy per unit volume of a stretched wire is

Choose an answer

(1/2) x load x extension

Load x stress

Stress x strain

(1/2) x stress x strain

Approximate power of a car moving at a speed of 90 kmh^-1 in watts

Choose an answer

1.1 × 10⁵

1.2 × 10⁶

1.3 × 10⁷

1.4 × 10⁸

Which theory of gravitation is better

Choose an answer

Einsteins

Newtons

Lapalces

None of these

Which of the following parameter does not characterize the thermodynamic state of matter?

Choose an answer

Work

Pressure

Temperature

Internal energy

If a gymnast sitting on a rotating table with his arms out stretched suddenly lowers his hands

Choose an answer

The angular velocity decreases

The moment of inertia decreases

The angular velocity remains constant

The angular momentum increases

In Michelson interferometer if the moveable mirror is moved through a distance of 8λ then the number of fringes shifted are

Choose an answer

4

8

16

32

Which one of the following waves cannot be polarized

Choose an answer

Radio waves

X-rays

Transverse waves in a string

Longitudinal waves in a gas

Unit of solid angle is

Choose an answer

Radian

Degree

Steradian

Revolution

If a force acts on a body whose action line does not pass through its centre of gravity.then the body will experience

Choose an answer

Angular acceleration

Linear acceleration

No acceleration

None of these

When satellite is moving in a circle, it has an aceleration

Choose an answer

mV²/r

ωr/V

V²/r

ωV/r

The percentage uncertainty in measuring the volume of sphere measured by calipers callipers is when r = 2.25 ± 0.01 cm with least count ± 0.01 cm

Choose an answer

46.7 ± 0.5 cm²

47.7 ± 0.5 cm³

47.7 ± 0.6 cm³

477.6 ± 0.6 cm³

The expression for the range of the projectile is

Choose an answer

Viscosity of air at 30^oC in Nsm^-2

Choose an answer

0.015 × 10^-3

0.019 × 10^-3

0.151 × 10^-3

0.0179 × 10^-3

Temperature of a system is defined as

Choose an answer

Initial K.E. of its molecules

Instantaneous K.E. of its molecules

Average K.E. of its molecules

All of these

The normal human eye can focus a sharp image of an object located anywhere form infinity to a certain point called

Choose an answer

Far point

Near point

distant point

None of these

Absolute zero is considered as that temperature at which:

Choose an answer

All liquids become gases

All gases become liquids

Water freezes

None of these

On a diffraction grating which thing acts as a slit

Choose an answer

the lines which are ruled on it

the spacing between the lines

either of them

none of them

Stress beyond which a permanent deformation is observed in a body is called

Choose an answer

Minimum stress

Maximum

Yield stress

Plastic stress

At the maximum height the V_fis

Choose an answer

Constant

Zero

Maximum

None of these

A component of a vector has its

Choose an answer

Normal value

Effective value

Given direction

b and c

Which is constant for a satellite in orbit?

Choose an answer

Velocity

K.E.

Angular Momentum

Potential Energy

Due to dispersion effects, white light source is useful for

Choose an answer

Long distance

Short distance

Very long distances

None of these

In the absence of any force acting on a body

Choose an answer

its momentum changes with distance

its momentum is conserved

its momentum is not conserved

its momentum changes with time

Once heat is transferred to an object, it is converted into the

Choose an answer

Entropy of the object

Internal energy of the object

Temperature of the object

None of these

The word fluid means

Choose an answer

To rise

To fall

To flow

To oppose

A certain engine coverts 20% of available heat energy into work. Then its efficiency will be:

Choose an answer

20%

80%

50%

None of these

In a soft iron, domains are

Choose an answer

easily oriented along external field and do not return to original random positions

easily oriented along external field and readily returns to originally random positions

do not oriented along external field and also do not returns to original random position

none of them

A monkey sits on the pan of spring scale kept in an elevator.The reading of the spring scale will be maximum when

Choose an answer

Elevator is stationary

Elevator cable break and it falls freely towards earth

Elevator accelerates downwards

Elevator accelerates upwards

Two monochromatic radiations X and Y are incident normally on a diffraction grating.The second order intensity maximum for X coincides with the third order intensity maximum for Y what is the ratio wavelength of X/wavelength of Y?

Choose an answer

1/2

2/3

3/2

2/1

X-rays interact with

Choose an answer

solid crystal

atoms in the crystal

nuclei of atoms in the crystal

electrons of atoms in the crystal

In thermodynamics, the change in internal energy depends upon:

Choose an answer

The path taken between initial and final states

The initial state only

The final state only

Initial and final states

Davisson and Germer received the Nobel prize for their work on:

Choose an answer

Wave nature of particle

Corpuscular nature of wave

Dual nature of particle

All of them

The direction of force experienced by a moving in a magnetic field will be:

Choose an answer

Parallel to the field

Opposite to the field

Parallel to its direction of motion

Perpendicular to both the field and the velocity vector

The dimensional formula for modulus of rigidity is:

Choose an answer

ML^-1T¹

ML^-2T²

MLT¹

ML^-1T^-2

Pure form of semiconductor is called

Choose an answer

Extrinsic semiconductor

Intrinsic semiconductor

N type

P type material

Of the following quantities, the one that is vector in character is an electric

Choose an answer

Charge

Field

Energy

Potential Difference

The whole range of colour printing uses just

Choose an answer

4 colours

3 colours

2 colours

Red, blue, gray

The emf of a cell of negligible internal resistance is 2V. It is connected to the series combination of 𝟐𝛀, 𝟑𝛀 𝐚𝐧𝐝 𝟓𝛀 resistance. The potential difference across 𝟑𝛀 resistance will be in volt:

Choose an answer

0.6

2/3

3

6

When the vectors are mutually perpendicular then the product is

Choose an answer

Maximum

Minimum

Zero

None of these

In projectile motion when a body is projected upward it must have

Choose an answer

Initial velocity

Angleθ<90°

Falling under gravity

All of these

The correct unit of power is

Choose an answer

Kilowatt

Dynes

Joule

Kilowatt-hour

If 5000 lines/cm are ruled on a diffraction grating, the element is:

Choose an answer

5 x 10^-5m

2 x 10^-6m

5 x 10^-6m

2 x 10^-5m

When a radioactive nucleus emits a 𝖰 −paritcles, the mass number of the atom:

Choose an answer

Increases by one

Decreases by one

Remains the same

Decreases by four

The number of different crystals systems based on the geometrical arrangement of their atoms and the resultant geometrical structures are

Choose an answer

5

7

9

14

Multimode step index fibre is useful for

Choose an answer

short distance

long distance

both a and b

none of them

For full wave rectification, the minimum number of diodes used is:

Choose an answer

1

2

3

4

The density of human blood is equal to that of

Choose an answer

Oil

Glycerin

Honey

Water

On Celsius scale boiling point of water is taken as

Choose an answer

0°C

100°C

180°C

None of these

The magnitude of work is

Choose an answer

W = Fd cos θ

W = Fd

W = dF cos θ

All of these

A rocket carries its own fuel in the form of a

Choose an answer

Liquid and oxygen

Solid and oxygen

Both

None of these

The percentage errors in the measurement of mass and speed are 3% and 4% respectively.The maximum error in the measurement of kinetic energy is:

Choose an answer

11%

10%

8%

9%

In torque when the force is kept constant and the moment arm increases, then the torque

Choose an answer

Increases

Decreases

Remains constant

None of these

Nm^-2is approximately called:

Choose an answer

Telsa

Weber

Pascal

Watt

Guass

When a shell explodes a mid-air, the total momentum of its fragments is

Choose an answer

less than the momentum of shell

equal to the momentum of shell

greater than the momentum of shell

none of them

Which of the following colors suffers maximum deviation in a prism?

Choose an answer

Yellow

Blue

Green

Orange

Newtons third law says, that the action and reactions are

Choose an answer

Equal but in the same direction

Equal but in opposite direction

May be unequal but in the same direction

May be unequal but in opposite direction

The volume of liquid flowing per second out of an orifice at the bottom of a tank does not depend upon

Choose an answer

The area of the orifice

The height of liquid above the orifice

The density of liquid

Both A and C

Two equal forces (P each) act at a point inclined to each other at an angle of 120°.The magnitude of their resultant is

Choose an answer

P/2

P/4

P

2P

The typical wavelength of light source in transmitter is

Choose an answer

1.1 μm

1.2 μm

1.3 μm

1.4 μm

The state of rest and state of motion are

Choose an answer

Irrelevant

Relative

Both

None of these

The temperature scale approved in SI units is:

Choose an answer

Calslus scale

Kelvin scale

Fehrenhelt scale

None of these