Question # 1

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

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Velocity

Frequency

Wavelength

Amplitude

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

As isolated system in which

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No internal force acts

No external force acts

No internal and external force acts

None of these

For a freely falling elevator

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a = W

a = T

a = 0

a = g

Conductors are those materials in which energy gap is

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very large (several eV)

very narrow (= 1eV)

either of them

none of them

The number of seconds in one year are

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3.154 x 10⁶

3.154 x 10⁵

3.154 x 10⁴

3.154 x 10⁷

Bulk modulus is involved when the deformation is

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One dimensional

Two dimensional

Three dimensional

All of these

The sink in the heat engine is at

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Low temperature

High temperature

Zero temperature

None of these

An aircraft is moving with a velocity of 300 ms^-1.If all the forces acting on it are balanced then

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It still moves with the same velocity

It will be just floating at the same point in space

It will be fall down instantaneously

It will lose its velocity gradually

Acceptor impurities donate

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Holes

Electrons

Both Electrons and Holes

None of them

The typical speed of reconnaissance jet (SR-71) is

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900 ms^-1

950 ms^-1

980 ms^-1

990 ms^-1

The body is in a dynamic equilibrium when it is

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At rest

In motion

In uniform motion

Acceleration motion

When the fluid is incompressible, for which the density is

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Constant

Change

Both

None of these

Commercial polarizing material is

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Colour glass

Infra red glass

Polaroid glass

None of these

Tick the one which is not a crystalline solid:

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Zirconia

Glass

Copper

Ceramic solid

An ionic compound

Wavelength of a laser beam can be used as a standard of

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Time

Angle

Length

Temperature

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

To find wavelength of light by his experiment. Newton utilized:

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Principle of phase change

Snell's Law

Bragg's law

Both (A) and (C)

Which of the following converts electrical signals into light signals?

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optical fibre

receiver

reflector

transmitter

Color printing uses just ______ colors

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Seven

five

three

four

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

A null vector is defined as

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Zero magnitude

Arbitrary direction

Fixed direction

a and b

The typical speed of has working aunt is

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0.1 ms^-1

0.01 ms^-1

0.001 ms^-1

0.025 ms^-1

Which of the following theories of light are explained by the Young's double slit experiment?

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wave theory of light

particle nature of light

dual nature of light

corpuscular nature of light

Newtons laws are empirical laws, deduced from

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Theories

Experiments

Facts

None of these

Shear modulus for tungsten is

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50

100

150

200

The terminal velocity of a 2 cm radius ball in liquid is 20 cms^{-1. What would be the terminal velocity if the radius of the ball were halved? Keeping the mass constant}

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80 cms^-1

40 cms^-1

20 cms^-1

5 cms^-1

A fly is sitting on the objective of a telescope pointed towards the moons what effect is impacted in a photograph of the moon taken through the telescope

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The entire field of vision is blocked

There is image of the fly on the photograph

There is no effect at all

There is the reduction in intensity of the image

Two masses of 1 g and 4 g are moving with equal kinetic energies.The ratio of the magnitudes of their linear momenta is:

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4 : 1

√2 : 1

1 : 2

1 : 16

The component of a vector has its direction as

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Same

Opposite

perpendicular

None of these

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

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5

7

9

14

Young's modulus for ice is

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3

14

20

32

Viscosity of air is

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0.019x10³ Nsm^-2

0.019x10^-3 N-sm^-2

0.019x10³ Nsm^-2

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

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1.2

1.5

1.55

1.56

Si system is based upon ______ kind of units

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One

Two

Three

Four

Position vector is a vector, which describes the

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Location of a point with respect to origin

Location of point with respect to any point

Location of a point with respect to some related point

None of these

SI unit for moment arm is

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Nm^-2

Nm

Kg ms²

None of them

At high speed and for long trajectories the air friction is

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Negligible

Not negligible

More than gravity

None of these

The dark areas retain their

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negative charges

positive charges

both positive and negative charge

none of these

In semiconductors, at 0 K, the electrons in conduction band is

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Partially filled

No

Yes

None of these

If an electron has an initial velocity in a direction different from that of an electric field the path of

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Straight line

Circle

Ellipse

Parabola

A tank containing water has an orifice in one vertical side. If the centre of the orifice is 10 m below the surface level in tank, then velocity of efflux is

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44 ms^-1

14 ms^-1

10 ms^-1

49 ms^-1

Most widely used optical fibres are those which propagate light by

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total interval reflection

continuous refraction

both of them

none of them

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

Graham Bell photo phone used a modulated beam of

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Reflected sun light

Refracted sun light

Diffracted sun light

None of these

Examples of first law of thermodynamics

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Working of bicycle pump

Human metabolism

Brakes applied by an auto mobile

All of these

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

As the droplet accelerates, the upward drag force on it

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Increases

Decreases

Suspended

None of these

A small metallic sphere is dropped in a long jar of honey, it will move as

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Float in jar

It will move with g

Fall with acceleration less than g

Grain terminal velocity

In carnot cycle, there are isotherms as

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One

Two

Three

Four

A body is in its state of stress when it is

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Displaced from its equilibrium position

Remains at rest when shape changed

Their angles change

All of them

When the body is at rest the relation

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W - T = ma

T - W = ma

T = W

None of these

The weight of man is an elevator descending down with an acceleration of 9.8 ms^-2will become

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Half

Double

Unchanged

Zero

The discuss used by athletes has a mass of 1 kg, its weight in newtons is

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9.8 N

80 N

98 N

100 N

The unit of capacitance of a capacitor

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Joule

Farad

Potential

Intensity

The rotational analogue of power is given by

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τω

τv

F ω

τ/ω

Charge to mass ratio (e/m) of a charge particle is also called its:

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Specific charge

Specific Force

Gyro-magnetic ratio

Magneto-mechanical ratio

________ is a pattern which has got one more atom at the centre of a simple cube.

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Simple cube

Face centered cube

Body centered cube

None of these

A circular scale is attached and graduated in

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One degree

2 degrees

Half degree

None of these

If plane polarized light is incident on the second sheet of Polaroid, the light emitted is full light when their axes are

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Parallel to each other

Perpendicular to each other

In between two positions

None of these

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

The characteristics of steady flow is

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Non-viscous

Incompressible

Streamline

All of these

The quantity of motion of the body is called

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Force

Acceleration

Momentum

None of these

Consider telecommunication through optical fibers.Which of the following statements is not true?

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Optical fibers may have homogeneous core with a suitable cladding

Optical fibers can be of graded refractive index

Optical fibers are subject to electromagnetic interference from outside

Optical fibers have extremely low transmission loss

What remains constant in the field of central force?

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Potential energy

Kinetic energy

Angular momentum

Linear momentum

The half-life of a radioactive element which has only 1//32 of its original mass left after a lapse of 60 days is:

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12days

10days

22days

36days

Who discovered the inverse square law of gravity

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Einstein

Newton

Compton

Fermi

The SI unit of momentum is

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Kgms^-1

Kgms^-2

NS

A and C

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

In a uniform circular motion (horizontal) of a ball tied with a string,velocity at any time is at any angle θ is

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θ = 60°

θ = 30°

θ = 90°

None of the above

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

Polymers have naturally combinations like with

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Oxygen

Sulphuric

Hydrocarbons

Oxygen and carbons

Hails fall faster than rain drops due to their

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Greater size

Greater mass

Greater area

None of these

Swimming is possible on account of

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First law of motion

Second law of motion

Third law of motion

Newtons law of gravitation

Acceleration of a body is positive, if the velocity of the body is

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constant

increasing

decreasing

none of them

Propagation of light in an optical fiber requires that light should be

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Refracted from air to fiber

Continuously refraction

Totally reflected within the fiber

Both B and C

The components of a fibre optic communication system is/are

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At transmitter

An optical fibre

Receiver

All of these

If the line of action of force passes through the axis of rotation or origin then its torque is

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Maximum

Zero

Negative

Non-zero

The intensity of the earth's gravitational field is maximum at

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The centre of the earth

The equator

The poles

None of the above

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

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

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brittle substances

ductile substances

plastic substances

elastic substances

Angular momentum of a particle is

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Parallel to its linear momentum

Perpendicular to its linear momentum

Inclined to its linear momentum

A scalar quantity

The simplest type of rectification known as half wave rectification is obtained by

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Using a transistor

Suppressing the harmonics in A.C. voltage

Suppressing half wave of A.C. supply by using diode

Using a Coolidge

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

Repeaters are the devices which regenerate the signals and are placed at about

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20 km

30 km

40 km

50 km

The quality of the moving body is called

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Motion

Momentum

Force

None of these

A bomb of mass 9 kg explodes into two pieces of mass 3 kg and 6 kg.The velocity of mass 3 kg is16 ms^-1,K.E of mass 6 kg is

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96 j

192 j

384 j

768 j

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

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Neon lamp

Fluorescent tube

Sodium lamp

None of these

The angle of incidence at which angle of refraction becomes 90⁰ is called

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Incident angle

Angle of refraction

Critical angle

Phase angle

In an optical fibre the speed of light is

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Directly proportional to its refractive

Inversely proportional to its refractive inedex

Independent of refractive index

Directly proportional to square of refractive index

What makes the hair shaving brush cling together when taken out of water

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Viscosity

Attraction between the hair

Gravity

Surface tension

A 1500 kg car has its velocity reduced from 20 ms^-1to 15ms^-1in 3.0 S. How large was the average retarding force

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-4.5 KN

-2.5 KN

-3.7 KN

-4.3 KN

The resolution of microscope depends on objective's

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Focal length

Material

Diameter

None of these

Which of the following cannot be polarized?

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x-rays

light rays

sound waves

ultraviolet rays

The speed of commercial jet (air liner) is

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200 ms^-1

267 ms^-1

327 ms^-1

335 ms^-1

The product of force and time of impact force is called

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Momentum

Impulsive force

Impulse

Rate of change of momentum

A stress which decreases the stress along one dimension is known as:

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Compressive stress

Tensile stress

Linear stress

Both (B) and (C)

The power of a pump motor is 2 kilowatt.The water raised by the pump per minute to a height of 10 m is nearly

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500 kg

7000 kg

1200 kg

Zero

Energy per unit volume of a stretched wire is

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(1/2) x load x extension

Load x stress

Stress x strain

(1/2) x stress x strain

An electron of charge e coulomb passes through a potential difference of V volts,its energy in 'joules' will be

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V/e

eV

e/V

V

The largest satellite system in managed by countries

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112

140

126

107

The unpolarized light is

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An ordinary incandescent bulb

Sun

Moon

All of these

Which mode can carry more than 14 TV channels or 14000 phone cells?

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single mod step index

multimode step index

multimode graded index

all of them

The curie temperature of iron is called

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250°C

500°C

750°C

1000°C

The direction of torque can be determined by

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Head to tail rule

Right hand rule

Left hand rule

None of these

If two ping pong balls are suspended near each other and a fast stream of air is produced in the space between the balls, then the balls.

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Come closer

Move farther

Remain in original position

Fall down

In addition and subtraction

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Percentage uncertainties are added

Percentage uncertainties are subtracted

Absolute uncertainties are added

Absolute uncertainties are subtracted

A steady current is flowing in a conductor of non-uniform cross-section. Thecharge passing through any cross-section per unit time is

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Directly proportional to the area of cross-section

Inversely proportional to the area of cross-section

Proportional to square of the area of cross-section

Independent of the area of cross-section

In projectile motion the vertical acceleration is

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Zero

Maximum

'g'

None of these

Human body pressure measure in

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torr

pascal

mmH_g

Nm^-2

Optical fibres are of

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Five type

Two type

Three type

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

A whistle is revolved with high speed in a horizontal circle of radius R. to an observer at the centre of the circle the frequency of the whistle will appear to be:

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Decreasing

Increasing

Both

Constant

Planck's constant has the dimensions of:

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Energy

Momentum

Frequency

Angular momentun

With the rise of temperature the amplitude of atoms

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Slow down

Fixed

Increases

None of these

Which of the following is conserved when light waves interfere

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Intensity

Energy

Amplitude

Momentum

The fractional change in volume per unit increase is pressure in called:

Choose an answer

Pressure coefficient

Volume coefficient

Bulk modulus

Compressibitlity

The perpendicular distance between axis of rotation and line of action of force is called

Choose an answer

Moment

Length arm

Moment of length

Moment arm

The angle with the horizontal at which an underwater swimmer will see the setting sun is

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91°

32°

49°

69°

A bullet is shot from a rifle.As a result the rifle recoils The kinetic energy of rifle as compared to that of bullet is

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Less

Greater

Equal

Cannot be concluded

Fight of rocket in the space is an example of

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Newton's first law

Newton's third law

Newton's second law

all of them

What quantity produces the angular acceleration in body

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Momentum

Inertia

Moment of inertia

Torque

Examples of polymers are

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Polythene

Polystyrene

Nylon

All of them

Moment of inertia of a thin ring or hoop is

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mr²

2/3 mr²

5/6 mr²

1/3 mr²

During adiabatic expansion change of 2 moles of gas the internal energy is 100 j, the work done this expansion is

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Zero

-100 J

200 J

100 J

In a semiconductor,the mobility of holes is

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Greater then electrons

Less than electrons

Equal to electrons

None

The viscous force on a small sphere moving in fluid at high speed v is proportional to

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v²

v

1/v

1/v²

In an inelastic collision

Choose an answer

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

The wavelength of refractive wave in a denser medium is

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Same as that of the incident wave

Become smaller than the incident

Becomes greater than the incident wave

None of these

The device which is used to measure the degree of hotness or coldness of the object.

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Thermometer

Barometer

Hypermeter

None of these

In equation of continuity, if the fluid is incompressible and the flow is steady, the mass of the fluid is

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Some what conserved

Conserved

Not conserved

None of these

The moment of linear momentum of a body is called

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Angular momentum

Couple

Impulse

Torque

The relative permitivity ∈_r for rubber is

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2.8

3.0

2.90

2.94

Substances which donot easily flow have coefficient of viscosity as

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Small

Very small

Large

None of these

A ballistic missile moves under the result of the superposition of

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one independent motion

two independent motions

one dependent motion

two dependent motions

A diesel engine converts heat energy into work by

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35%

40%

35% to 40%

45%

The Bernoulli's equation often expressed in

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Television signal are converted into light signals by

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Decoder

Transistor

Photodiode

Optical fibre

The typical speed of Earth around the sun is

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29700 ms^-1

29600 ms^-1

29500 ms^-1

29400 ms^-1

An automobile moves with constant speed along a circle of radius 40 m. It takes 2 μ second to complete one circle,The average speed for one complete circle is

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20 ms^-1

40 ms^-1

60 ms^-1

0 ms^-1

The matter and energy are equivalent, was proposed by

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Newton

Einstein

Maxwell

None of these

If the particle is moving in a circle of radius 'r' with uniform angular velocity ω. The angle between r and tangential velocity is

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0^o

90^o

180^o

270^o

The distance between the concentric wavefronts is

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half wavelength

one wavelength

one and a half wavelength

none of them

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

A constant volume gas thermometer works on

Choose an answer

Charles' law

Boyle's law

Pascal's law

None of these

A wire can support a load W without breaking. It is cut into two equal parts. The maximum load that each part can support is:

Choose an answer

W/4

W/2

W

2 W

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

Super conductor offers no resistance to

Choose an answer

Thermal agitation

Electric current

Induced current

None of these

As the droplet accelerates the net force acing on it is

Choose an answer

Increase

Decreases

Zero

None of these

When 400.1 is added to 20.54 we get

Choose an answer

420

420.65

420.1

420.6

A new type of optical fibre in which central core has high refractive index and its density gradually decreases towards its periphery is called

Choose an answer

Step index fibre

Multimode step index fibre

Multimode graded index

None of these

The positions of two aeroplanes at any instant are at A (2, 3, 4) and B(5, 6, 7) from the origin in km. Find the distance between the two aeroplanes.

Choose an answer

3.2 Km

4.9 Km

5.0 Km

5.2 Km

Common methods used for the conversion of biomass into fuels are

Choose an answer

Fermentation

In direct combustion

Direct combustion

None of these

The terminal velocity of falling object will be proportional to

Choose an answer

r²

1/r²

r

1/r

The displacement coincides with the path of motion when a body moves along a

Choose an answer

Straight line

Curved path

Zig Zag path

None of these

The initial velocity with which a body projected upward and never comes back is called

Choose an answer

Kinetic energy

Terminal velocity

Escape velocity

None of these

If at a pressure of 10⁵Nm^-2, the density of oxygen is 1.4 Kgm^-3the rms velocity of oxygen molecule in ms^-1is

Choose an answer

18

120

270

460

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

Choose an answer

Steam

Hot water

Both

None of these

The units of torque and couple are

Choose an answer

N-m and N-m²respectively

N-m and N

N-m^-1for both

N-m²and N-m respectively

A 50 kg man with 20 kg load on his head climbs up 20 steps of 0.25 m height each.The work done in climbing is

Choose an answer

5 J

350 J

100 J

3430 J

Energy stored in a capacitor is

Choose an answer

E = 1/2 C²V²

E = 1/2 C^-1V²

E = 1/2 CV²

E = C²V²

The point at which an applied force produces a linear acceleration but not rotation is called

Choose an answer

Center of the body

Center of mass

Center of gravity

Both B and C

If the velocity of the body decreases non-uniformly, then the slope of the velocity-time graph will have

Choose an answer

different values

same values

zero value

constant valve

Electrons of an isolated atom are bound to the nucleus, and?

Choose an answer

can only have distinct energy level

can only have same energy level

may or may not have distinct energy

none of them

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

A total charge of 100C flows through 12W bulb in a time of 50 second. Which is the potential difference across the bulb during this time?

Choose an answer

0.12V

6.0V

2.0V

24V

Blood vessels under normal conditions are inflate

Choose an answer

Occasionally

Some times

All the times

None of these

Close orbiting satellites orbit the Earth at a height of about

Choose an answer

500 km

400 km

300 km

800 km

Recently a complex crystalline structure known as Yetrium Barium Copper Oxide have been reported to become superconductor at

Choose an answer

125 K

25 K

263 K

163 K

Significant figure in 0.00110

Choose an answer

One

Two

Three

Four

Who gave the idea of light as wave ?

Choose an answer

Newton

Huygen

Thomos Young

Bragg

When an image is placed at the focal length of the eye piece, the final image formed at

Choose an answer

2 F

4 F

6 F

Infinity

The image of the tip of a needle is never sharp because of

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Polarization of light

Interference of light

Diffraction of light

Reflection of light

The typical speed of human swimming is

Choose an answer

1.5 ms^-1

2 ms^-1

2.5 ms^-1

3.0 ms^-1

Energy can be obtained form solid waste by

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Direct combustion

Indirect combustion

Permentation

None of these

Physics deals with the study of

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Matter and Energy

Outer atmosphere

Matter and Energy and their relationship

None of these

The changes which involve friction or dissipation of energy are reversible through

Choose an answer

Conduction

Convection

Radiation

All of these

Which one is ferromagnetic

Choose an answer

Ferries

Cobalt

Nickel

All

A disc of moment of inertia is 5 x 10^-3 kgm² is making 20 rad/sec. The torque required to stop it in 10 sec is

Choose an answer

1x10^-3 Nm

1x10^-2Nm

0.1x10^-3 Nm

None of these

Angular momentum is

Choose an answer

A scalar

A vector

Neither A.nor B.

Either A.or B.

The technological uses of superconductors are

Choose an answer

MRI

Magnetic levitation trains

Faster computer chips

All of them

Energy required to accelerate a car from 10 ms^-1to 20 ms^-1compared with that required to accelerate from 0 to 10 ms^-1is

Choose an answer

Twice

Three times

Four times

Same

The identity of an element is determined by:

Choose an answer

the number of its protons

the number of its electrons

the number of its neutrons

its atomic mass

Bodies falling freely under gravity provide good example of motion under

Choose an answer

non-uniform acceleration

uniform acceleration

variable acceleration

increasing acceleration

The fibre core has constant refractive index such as

Choose an answer

1.48

1.5

1.52

1.56

If moon radius 1600 km and g on its surface is 1.6 ms^-2Then the escape velocity on the moon is

Choose an answer

1600 ms^-1

50.6 ms^-1

50.8 ms^-1

2263 ms^-1

The original source of hydroelectric is

Choose an answer

Water

Wind

Sun

Moon

The fluid which is incompressible and non viscous is called

Choose an answer

Ideal fluid

Non ideal fluid

Perfect fluid

All

If the two reflected waves reinforce each other then the firm as seen from the parallel beam of monochromic light will look

Choose an answer

Dark

Bright

Sometimes bright and dark

None of these

The venturi meter is a device used to measure the fluid

Choose an answer

Pressure

Quantity

Temperature

Speed

The clouds float in the atmosphere because of

Choose an answer

Their low temperature

Their low viscosity

Their low density

Creation of low pressure

Spokes used in a bicycle wheel increase its

Choose an answer

Moment arm

Moment of inertia

Acceleration

Velocity

In which process the P - V diagram is a straight line parallel to volume axis

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Isobaric

Isothermal

Isochoric

Adiabatic

An object is placed between two parallel mirrors the number of images formed is

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2

4

8

Infinite

A diode as a rectifier converts:

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A)c into D)c

D)c into A)c

Varying D)c current into constant D)c current

High voltage into low voltage and vice-versa

The ratio of linear stress/linear strain is called as

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Young's modulus

Bulk modulus

Shear modulus

Modulus

Acceleration means the speed of the body is

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Increasing

Decreasing

Just stop

None of these

The ability of body to return to its original shape is called

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Elasticity

Stress

Strain

Shear

Consult page 50 of your text and trick the correct statement.

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Velocity of x-rays is greater than velocity of light

Velocity of right light is less than velocity of radio waves

Velocity of light, x-rays and radio waves is the same

None of the above is correct

The average kinetic energy of the molecules of the object is called its

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Heat

Temperature

Hotness

Coldness

If the tension in a string stretched between two fixed points is made four times, the frequency of the fundamental harmonic will become:

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Two times

Three times

Four times

Six times