Question # 1

The units of modulus of elasticity are same as that of

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Stress

Strain

Force

None

The ratio of shearing stress/shearing strain is called as

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modulus

Pascal modulus

Hooke's modulus

shear modulus

A typical diffraction grating has lines per centimeter is about

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500 to 6000

400 to 5000

450 to 5500

425 to 5670

The distance between two concentric wave fronts is

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A wave length

A half wavelength

Zero

None of these

In case of point source of light, shape of wavefront is:

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Spherical

Cylindrical

Plane

None of these

Which one of the following is polymer

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Polythene

Polystyrene

Nylon

All

The substances in which, atom are so oriented that their field support each other and the atoms behave like tiny magnets, are called

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

Bulk modulus for tungsten is

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50

100

150

200

In petrol engine, the second stroke is the

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Compression

In take

Power

None of these

Newtons first law of motion says a body will

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Remains at rest

Continuous move to with uniform velocity

Have no unbalanced external force act

All of these

In an inelastic collision

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Both K.E and momentum are conserved

Both K.E and momentum are not conserved

Momentum is conserved and K.E is not conserved

K.E is conserved and momentum is not conserved

For atomic nucleus, the binding energy per nucleon with increase in mass number:

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Increases continuously

Remains same

Decrease continuously

First increases and then decreases with increase in mass number

Which of the following is dimensionally correct

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Pressure = energy per unit area

Pressure = energy per unit volume

Pressure = force per unit volume

Pressure = Momentum per unit volume per unit time

The maximum kinetic energy of emitted photoelectrons depends upon:

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The intensity of incident light

Frequency of the incident light

Temperature of the surface

All of above

Choose the correct statement

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Rays are normal to wave front

Rays may be normal to wave front

Rays are not normal to wave front

There is no relationship between rays and wave fronts

Law of conservation of momentum has been verified for the

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Cosmological level

Microscopic level

Submicroscopic level

a and c

Which of the following curve in P - V diagram represent adiabatic process

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The acceleration produced in the body varies

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Directly with the applied force

Inversely to the mass of the body

Both

None of these

When the velocity of a body is increasing, the acceleration produced is

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No acceleration produced

Negative acceleration

Positive acceleration

None of these

The momentum of particle is numerically equal to its kinetic energy.What will be the velocity of the particle?

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4 m/s

1 m/s

2 m/s

None of these

At the top of the trajectory of a projectile,the acceleration is

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The maximum

The minimum

Zero

g

In case when there is no total displacement and average velocity, then the motion is described by

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Variable velocity

Instantaneous velocity

Initial velocity

None of these

Two sources of light are said to be coherent when the waves produced by them have

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Equal wavelength

Equal amplitude

Equal wavelength and constant phase difference

Amplitude and wavelength are same

Which property of waves proves that light is a transverse wave?

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diffraction

interference

polarization

reflection

The rotational analogue of force is

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Torque

Momentum

Moment of inertia

None of these

The law of conservation of energy is the base of

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Stoke's theorem

Carnot's theorem

Bernoulli's theorem

None of these

Find the potential at a point, where a charge of 1 × 10^-3 coulomb is placed at a distance of 10 m is

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1 mV

1.9 KV

1.6 KV

.15 KV

A straight current carrying conductor experiences maximum forces in a uniform magnetic field when it is placed:

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Parallel to the field

Perpendicular o the field

At an angle of 45 to the field

None of these

When we jump out of a boat standing in water moves

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Forward

Backward

Sideways

None of these

If the instantaneous velocity of a body does not change, the body is said to be moving with

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average velocity

uniform velocity

instantaneous velocity

variable velocity

If stress is increased beyond the elastic limit and change in solid is permanent this behaviour is called

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Elasticity

Plasticity

Conductivity

Insulator

When a ray of light enters a denser medium from a rarer medium,its:

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Wavelength increases

Velocity increases

Frequency decreases

Wavelength decreases

Cladding in an optical fiber is used to

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Absorb unneccessary light

Produce total internal reflection

Transmit light

Filter light

The flow is said to be streamline or laminar when very particle

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Moves in different direction

Moves along the same path as

Slowly moves in one direction

None of these

Approximate power of flash light in watts: (2 cells)

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1.2

1.5

1.55

1.56

To demonstrate the phenomenon of interference we require two sources that emit radiation

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Of same frequency

Different wavelength

Of the same frequency and having definite phase relationship

Of nearly the same frequency

The total linear momentum of an isolated system remains

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Constant

Variable

Zero

None of these

Experimental demonstration of wave nature of light was given in 1801 by

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New ton

Maxwell

Thomas young

Huygen

Planck's constant has the dimensions of:

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Energy

Momentum

Frequency

Angular momentun

The renewable energy source is a biomass which is a

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Rare source

Unlimited source

Potential source

None of these

Bats navigate and find food by:

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Ultrasonic

Echolocation

Refraction

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

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less than the momentum of shell

equal to the momentum of shell

greater than the momentum of shell

none of them

In case of linear deformation, the ratio of the tensile stress to the tensile strain is called

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Young's modulus

Bulk modulus

shear modulus

all of them

It is a common characteristic of all types of wave motion that

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Particles move up and down

Particles move back and forth

Energy is transferred without the transport of particles

A material medium transmits the disturbance

A single converging lens placed close to the eye to see magnified image is called

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A telescope

Compound microscope

Simple microscope

None of these

For fast moving particles, such as atomic particles in an accelerator, the following branch of physics is applicable

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newtonian mechanics

classical mechanics

relativistic mechanics

all of them

__________ is a cubic pattern having one extra atom or molecule at the centre of each of the six faces of the cube

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Simple cube

Face centered cube

Body centered cube

None of these

The Dimension of length is

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[L]⁰

[L]^-1

[L]

None of these

The irregular flown of fluid is called

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Normal flow

Streamline flow

Turbulent flow

None of these

The rotational analogue of mass in linear motion is

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Torque

Angular momentum

Moment of inertia

Weight

The resultant of two forces.one double the other in magnitude,is perpendicular to the smaller of the two forces.The angle between the two forces is

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120°

60°

90°

150°

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

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acceptor

donor

either of them

none of them

In diesel engine no sparking device and no need of

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Heavy current unit

Spark plug

Instant starting

None of these

Propagation of light in an optical fibre requires

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Total internal reflection

Continuous refraction

Both

None of these

When a crystal is subjected to stress, it tends to break or fracture along definite direction which is characteristic of a simple. This is called

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Cleavage

Allotropy

Isotropy

None of these

The light signal in an optical fibre requires that the light should

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be partially confined within the fibre

be totally confined within the fibre

not be confined within the table

none of them

The original source of tides is

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Ocean

Sun

Earth

Moon

The ratio of diameters of two convex lenses is ______ the ratio of their focal lengths

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Greater than

Less than

Equal to

Square of

Torque is a

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Scalar quantity

Vector quantity

Physical quantity

None of these

A conductor of capacity 50 μF is charged to 10V.The energy stored is

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1.25 x 10^-3 J

3.75 x 10^-3 J

2.5 x 10^-3 J

5 x 10^-3 J

The maximum energy of the photoelectrons depends upon:

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Frequency of incident light

Intensity of incident light

Nature of metal

Both (a) & (c)

In case of streamed lined flow of liquid.the loss of energy is

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Maximum

Minimum

Infinite

Equal to what is in turbulent flow

Due to dispersion effects, white light source is useful for

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Long distance

Short distance

Very long distances

None of these

An are equal to radius of the circle subtended an angle of ______ at the center of circle

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1 rad

2 rad

π rad

1/2π rad

A shortsighted person can see clearly

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Near objects

Far objects

Objects at 25 cm

Objects at infinity

At what point/points in its path does a projectile have its maximum speed ?

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At the point of projection

At the point where its strikes the ground

Both

None of these

A person A is going up in a balloon while another person is going down into a mine.Both are measuring the gravitational field.

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The field measured by both A and B goes on increasing.

The field measure by A Increases while the measured by B decreases

The field measured by A decreases while that measured by B decreases

The field measured by A decreases while that measured by B increases

Acceleration means the speed of the body is

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Increasing

Decreasing

Just stop

None of these

On reversing the direction of the applied force F,

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the magnitude of torque changes

the direction of torque remains unchanged

the direction of torque is reversed

both the direction and magnitude of torque change

First law of thermodynamics is merely a statement of law of conversation of:

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Energy

Angular momentum

Change

Linear momentum

The cars usually have cylinders on the crankshaft are

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2

3

4

6

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

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distance-time graphs

speed-time graphs

velocity-time graphs

acceleration-time graphs

The moment of inertia plays the same role in angular motion as in linear motion as

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Density

Weight

Mass

None of these

A ______ lens is used in the apparatus to get Newton,s rings

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Plano-concave

Plano-convex

Convexo-concave

Double convex

When the velocity of a body is decreasing, the acceleration produced is

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Positive acceleration

Negative acceleration

No acceleration produced

None of these

A convex lens is dipped in a liquid whose refractive index is equal to the material of the lens. Then its focal length will become

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Infinite

Zero

Extremely small

Extremely large

The phase difference between two points on a wave front will be

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0°

4π

2π

π/2

A system may be in equilibrium when

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the resultant force acting on it is zero

the resultant torque on it is zero

the sum of clockwise and anticlockwise moments (taken about the same point) are equal

all of them

A mental wire is stretched by suspending weight to if x is the longitudinal strain and y is young s modulus of elasticity then the elastic potential energy per unit volume is

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1/2 y x²

x² / 2y

y² / 2x

x² / 2y

By dimensional analysis, we can find

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Correctness of formula

Derivation of formula

Physical nature

All of these

The phenomenon of geothermal energy is a geyser. It is a hot spring that discharges

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Steam

Hot water

Both

None of these

Energy stored in the spring of watch is called

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Gravitational P.E.

Potential energy

Elastic potential energy

None of these

The half-life of a certain element is 3.5 days at STP. If the temperature is doubled and pressure is reduced to half then half-life of the same element will be:

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1.75 days

3.5 days

7 days

14 days

Mercury thermometer can be used to measure temperature up to

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260°C

100°C

360°C

450°C

Motion of rocket is based upon

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Newtons third law of motion

Law of conservation of momentum

Newtons law of gravitation

Both (a) and (b)

The concentration in solution can be determined by the property known as

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Solubility

Insolubility

Optical activity

None of these

Young's modulus for lead is

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10

11

15

19

The typical wavelength of light source in transmitter is

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1.1 μm

1.2 μm

1.3 μm

1.4 μm

The earth satellite is a

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Navy object

Revolving object

Accelerating object

Free falling object

Which of the following theory completely explain the three types of materials?

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Bohr model of electron distribution

Rutherford atomic model

Pauli's exclusion principle

energy band theory

A typical rocket consists of fuel

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more than 60% of launch mass

less than 60% of launch mass

less than 80% of launch mass

more than 80% of launch mass

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

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6.12 × 10^-3

6.18 × 10^-3

6.29 × 10^-3

6.79 × 10^-3

Light traveling through vacuum enters water which characteristic of light does not charge

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Velocity

Frequency

Wavelength

Amplitude

The forbidden energy gap in semiconductors

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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

Which one of the following has only bulk modulus?

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Diamond

Glass

Tungsten

Water

The electrons in the outermost shell of an atom are called

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Valence electrons

Tightly bound electrons

Free electrons

None of these

A motorcycle driver double its velocity when he is having a turn.The force exerted outwardly will by

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Double

Half

4 times

1/4 time

A stone is dropped from rest from the top of a tower 19.6m high.The distance traveled during the last second of its fall is (giving g = 9.8 m/s²)

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9.8 m

14.7 m

4.9 m

19.6 m

To decrease timing uncertainly

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Increase number of vibration

Decrease number of vibration

Increase length of pendulum

Decrease length of pendulum

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

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Wave nature of particle

Corpuscular nature of wave

Dual nature of particle

All of them

In full wave rectification, the output DC voltage across the load is obtained for.

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The positive half cycle of input AC only

The negative half cycle of input AC

The completes cycle of input AC only

All of the above

Which part of the spectrum is most visible?

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Red

Violet

Yellow

Yellow-green

A rocket carries its own fuel in the form of a

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Liquid and oxygen

Solid and oxygen

Both

None of these

The working of carburetor of a car uses

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Gravitational law

Equation of continuity

Bernoulli's theorem

Stock's law

The body is in equilibrium when it is in a state of

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Accelerated motion

Uniform motion

Rest or uniform motion

None of these

The equations for uniformly accelerated motion can also be applied to free fall motion of the objects by putting

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V_f= 0

Simple 'a'

a by g

None of these

The velocity of a projectile is maximum

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at the point of projection

just before striking the ground

none of them

both of them

In the relations d sinθ = nλ, shows that the value of θ depends upon 'n' so the images of different colours are much separated in

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Low orders

Middle orders

High order

None of these

The diffraction grating is used to measure

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wavelength of light

focal length of a lens

refractive index of prism

polarization of light

Which of the following is not an advantages of using optical fibres over copper cables?

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signal attenuation

number of signals carried per wire

cost of installation

none of the above

The concept of entropy was introduced in the thermodynamics by

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kelvin

Clausius

Carnot

None of these

Why is the weight of an object approximately the same at all points on the earth?

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the gravitational field is uniform

equal force is exerted on the object at points equidistant from the centre

weight is unaltered by attitude

weight of an object varies with its distance from earth

Physical quantities having no dimensions are called

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Scalar

Numerics

Non physical Quantities

None of these

The temperature at which the reading of Fahrenheit thermometer will be double that of a centigrade thermometer is

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160°C

180°C

140°C

100°C

The Permitivity ε_o of free space has the value in S.I. units is

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8.85 × 10^-10 C² N^-1 m^-2

8.85 × 10^-11 C² N^-1 m^-2

8.85 × 10^-12 C² N^-1 m^-2

8.85 × 10^-13 C² N^-1 m^-2

When two axis are drawn at right to each other are called

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Coordinate axes system

Cartesian system

Rectangular coordinate system

All of these

The information carrying capacity in an optical fibre is called

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wavelength

frequency

bandwidth

none of them

An are equal to half of the radius subtend angle of ________ at the center of circle.

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.π rad

2π rad

1/2π rad

1/2 rad

Calculate the critical angle when core refractive index is 1.50 and cladding of refractive index 1.48

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70.3^o

80.9^o

80.6^o

89.6^o

The focal length of the lens of human eye

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Is fixed

Varies from zero to infinity

Can be increased only

Can be decreased only

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

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1/R

1/R²

R

R²

Five equal forces of 10N each are applied at one point and all are lying in one plane.If the angles between them are equal,the resultant force will be:

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Zero

10 N

20 N

10 √2 N

Travel time of light from sun to earth is

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8 hours 20 minutes

8 minutes 20 seconds

1 minutes 20 seconds

5 hour 20 seconds

The electrons in the outermost shell are called

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Super electrons

Valance electrons

Full valance

Upper deep up

A 70 kg man runs up a long height of stairs in 4.0 sec. The vertical height of the stairs is 4.5 m. Calculate its power output in watts

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7.1 × 10³ W

7.2 × 10² W

7.3 × 10² W

7.7 × 10² W

Inertial frame of references are those frame of references which are moving with

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increasing velocity

decreasing velocity

constant velocity

all of them

Radius of planet A is twice that of planet B and the density of A is one third that of B. the ratio of the acceleration due to gravity at the surface of A to that at the surface of B is

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2 : 3

3 : 2

3 : 4

4 : 3

Light waves are

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Transverse waves

Longitudinal waves

Compressional wave

None of these

A tank full of liquid has an orifice 4.9 m below the surface level in the tank, the velocity of out coming liquid is

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4.9 ms^-1

9.8 ms^-1

2 x 9.8 ms^-1

4 x 9.8 ms^-1

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

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Increases

Decreases

Remains unchanged

Becomes infinite

When the left is moving upwards with an acceleration 'a' then

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T - W = ma

W - T = ma

T = W

None of these

Two projectiles are fired from the same point with the same speed at angles of projection 60° and 30° respectively.Which one of the following is true?

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Their range will be same

Their maximum height will be same

Their landing velocity will be same

their time of flight will be same

A pulse of light in the optical fibres represents the number

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0

1

2

3

If the plane polarized light is incident on the second sheet of Polaroid, no light is emitted when their axes are

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Parallel to each other

Perpendicular to each other

In between two positions

None of these

2 d sin θ = nλ can be used to determine the

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Inter planar spacing

Wavelength

Incident angle

All of these

De-Broglie received the Nobel prize on his work on:

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Wave nature of particle

Corpuscular nature of wave

Dual nature of particle

All of them

According to Huygen's principle:

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Light travel in straight line

Light is a transvers wave

Light has dual nature

All point on the primary wavefront are the sources of secondary wavelets

The vertical velocity component changes with

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Distance

Time

Height

Angle

Which of the following four statements is false?

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A body can have zero velocity and still be accelerated

A body can have a constant velocity and still have a varying speed

A body can have a constant speed and still have a varying velocity

The direction of the velocity of a body can change when its acceleration is constant

When a force is applied on a body, several effects are possible. Which of the following effect could not occur?

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the body rotates

the body speeds up

the mass of the body decreases

the body changes its direction

Stoke s law holds for

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Cubical bodies

Cylindrical bodies

Spherical bodies

Elliptical bodies

When light travels from one medium to another which are separated by a sharp boundary the characteristic which does not change is

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Velocity

Wavelength

Frequency

Amplitude

Whenever a body moves from one position to another, the change in its position is called

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Motion

Displacement

Distance

None of these

Newton's rings are formed due to

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Refraction of light

Diffraction of light

Interference of light

None of these

A thief stole a box with valuable article of weight W and jumped down a wall of height h.Before he reached ground he experienced a load of

Choose an answer

2W

W

W/2

Zero

When the terminal velocity is reached the acceleration of body moving through a viscous medium is

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Zero

Positive

Negative

Depends upon other factors

The time of flight of a projectile motion equals to

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half of the time to reach maximum height

twice the time to reach maximum height

one fourth of time to reach maximum height

time to reach maximum height

The blood flow is laminar at

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Normal blood pressure

Systolic blood pressure

Diastolic blood pressure

High blood presure

Speed of light in vacuum is

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0 ms^-1

3 x 10⁸ms^-1

1.5 x 10⁸ms^-1

None of these

Which of the following cannot have an effect on the weight of an object?

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The distance of the object from a planet

The acceleration of the object

The placement of the object on a different planet

The mass of the object

If the object of different masses move with the same velocity, then it is more difficult to stop the

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lighter of the two

massive of the two

any one of them

both of them

A usual way to obtain a plane wave is to place point source of light at the focus of a

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concave lens

convex lens

both of them

either of them

When an atom is surrounded by large number of atoms their the energy levels are

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Distinct

Very close

Energy band

None of these

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

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0.2145 m

0.21 m

0.2142 m

None

The scattering of X-rays from atoms in a crystalline lattice gives rise to

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Interference

Diffraction

Reflection

None of these

Diameter of the atom is of the order of

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10^-10m

10^-12m

10^-15m

10^-9m

The ratio of SI units to CGS units of gravitational constant G will be

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10^-3

10

10²

10³

Dolphins have bodies to assist their movement in water are

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Irregular bodies

Closer to streamline body

Stream lined bodies

None of these

Glass and high carbon steel are the examples of

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brittle substances

ductile substances

plastic substances

elastic substances

In the expression F x t the fore F is

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total force

instantaneous force

average force

all of them

Direction of torque can be found out by

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head to tail rule

parallelogram rule

left hand rule

right hand rule

Two particles of equal masses are revolving in circular paths of radii r₁ and r₂respectively with the same speed The ratio of their centripetal force

Choose an answer

r₂/r₁

√(r₂/r₁)

(r₂/r₁)

(r₂/r₁)²

The medium in which speed of light is the same in all directions is called:

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Homogeneous

Heterogeneous

Non-homogeneous

Free space

The diameter of the milky way is

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10¹⁵ m

10¹⁷ m

10¹⁸ m

10²⁰ m

The activity of a radioactive sample is 1.6 curie and half-life is 2.5 days. Its activity after 10 days will be:

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0.8 Curie

0.1Curie

0.4 Curie

0.16 Curie

The function of colimator is

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To converge the incoming rays

To make the parallel rays from source

In which the source of light is kept

None of these

At higher temperature their vibrations become so great that structure suddenly breaks up and changes into

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Order to disorder

Solid into liquid

Melted

All of them

The initial velocity of a body moving along a straight line in 7 m/s.It has a uniform acceleration of 4 m/s².The distance covered by the body in the 5th second of its motion is

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25 m

35 m

50 m

85 m

A substance containing equal no. of opposite charges separated by a small distance is known as

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Super conductor

LED

Dipole

Insulator

The correct statement about poissons ratio is

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Its unit is N/m²

It is dimensionless

Its unit is Newton

Its dimensions MLT²

The more viscous liquids is

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Coal tar

Honey

Kerosene oil

Water

Who gave the idea of light as wave ?

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Newton

Huygen

Thomos Young

Bragg

Three coplanar forces acting on a body keep it in equilibrium. They should, therefore be

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Parallel

Non-parallel

Concurrent

Non concurrent

In the study of interference and diffraction, we consider

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plane waves

plane wavefronts

both of them

none of them

A constant volume gas thermometer is more sensitive than liquid thermometer because

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Gas expand more than liquid

Gases are easily obtained

Gases are much lighter

Gases do not easily change their state

To get higher magnification we must use

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Simple microscope

A convex lens

A compound microscope

All of these

The rotational analogue of Newtons second law of motion is

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mr²α

mrα

mrα²

None of these

Internal friction of fluid is called

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Surface tension

Viscosity

Resistance

Cohesive force

The wavefront formed at very large distance from the source is:

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Cylindrical

Spherical

Elliptical

Plane

A ball is dropped from a certain height and another ball is projected horizontally from the same point.Which of the following statements is correct?

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Both hit the ground at the same velocity

Both hit the ground at the same speed

The change of velocity during the path for both balls is the same

The change of speed during the path for both balls is the same.

Two forces of 10N and 15N are acting simultaneously on an object in the same direction Their resultant is.

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Zero

5N

25N

150 N

One watt-hour is equivalent to

Choose an answer

3.6 x 10³ joule

3.6 x 10^-3 joule

6.3 x 10³ joule

6.3 x 10^-3 joule

Any person like an airline pilot, sailor can find his position on Earth surface by pocket size instrument within accuracy of

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5 m

10 m

10.5 m

11 m

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

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1st

2nd

3rd

None of these

At constant temperature, if the density of the gas is increased, its pressure will:

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Decrease

Increase

Remain unchanged

None of these

Which of the following is not the unit of energy?

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Calorie

Joule

Electron-volt

Watt

The typical speed of human running is

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1 ms^-1

2 ms^-1

4 ms^-1

5 ms^-1

Pressure exerted by a gas in merely momentum transferred to the walls due to the continuous collisions of molecules of the gas

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Per unit area

Per sec per unit area

Certain area

None of these

A capacitor of capacity 1 μF is charged to 1 kV.The energy stored in J

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5

0.5

0.005

50

A circuit that converts Pulsating DC into smooth DC contain :

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Filter

Capacitor

Inductor

LC circuit

Who attempted to measure the speed of light

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Gallileo

Michelson

Newton

None of these

The subtances which break just after the elastic limit is reached are known as:

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Ductile

Brittle

Malleable

Hard

Soft

In conductors, the valence band and conduction bands are

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Touch each other

Overlapped each other

Largely overlapped

None of these

The oil drop gets charged when it

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Pass through the medium

Pass through the atomizer

Light falls on it

All of them

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

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Centripetal

Centrifugal

Radial

Tangential

The splitting of white light into several colors on passing through a glass prism is due to

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Refraction

Reflection

Interference

Diffraction

The Earth and some other planets revolve round the Sun in

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Elliptic path

Nearly circular path

Circular path

None of these

Viscosity of gases with increase in temperature

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Increase

Decrease

Remains same

None

The cause of mirage observed in desert is

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Refraction

Reflection

Scattering

Total internal reflection

When a body acquired terminal velocity falling in a viscous medium than the acceleration

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a = -ve

a = +ve

a = g

a = zero

The ballistic missiles are useful only for

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long ranges

short ranges

medium ranges

none of them