Question # 1

Shear modulus for mercury is

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0

12

27

42

Thermodynamic temperature scale works

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For very high temperature only

For moderate temperature only

Even up to absolute Zero

None of these

A stationary wave is established in a string which vibrates in four segments at afrequency of 120 Hz. Its fundamental frequency is:

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15Hz

60Hz

30Hz

430Hz

The motion without consideration of its cause is studied in:

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Kinematics

Mechanics

Statics

Modern Physics

'S' is the arc length and after one revolution it becomes

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2π

2π/r

2πr

None of these

A gravity free system, in which satellite moves due to

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The free fall acceleration

Radial accelerations

Gravitational acceleration

All of these

The linear velocity in a circle is called

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Linear velocity

Angular velocity

Tangential velocity

None of these

If the path difference must be an integral multiple of wavelength

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sin θ = md/λ

d sin θ = mλ

d sin θ = m/λ

d sin θ = λ/m

The distance between the top adjacent slits on diffraction grating is called

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element

grating element

aperture

slit

In case of uniform circular motion which of the following physical quantity do not remain constant?

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Speed

Momentum

Kinetic energy

Mass

The energy stored in a wound watch spring is

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K.E

P.E

Heat energy

Chemical energy

Petrol engine coverts ____________ of available heat energy into work.

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20% to 25%

25% to 30%

30% to 35%

35% to 40%

A PN junction diode cannot be use:

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As rectifier

For converting light energy to electrical energy

For getting light radiation

For increasing the amplitude of an ac signal

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3 x 10⁵J

2 x 10⁵J

10⁵J

Zero

In projectile motion, the acceleration in horizontal is

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Maximum

Minimum

Zero

None of these

A gas STP is slowly compressed to one fourth of its original volume, then final pressure is

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4 atmosphere

0.75 atmosphere

8 atmosphere

0.25 atmosphere

Spherical balls of radius 'r' are falling in a viscous fluid of viscosity 'η' with a velocity 'v'. The retarding viscous force acting on the spherical ball is

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Inversely proportional to both r and v

Directly proportional to both r and v

Directly proportional to r but inversely proportional to v

Inversely proportional to r but directly proportional to v

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

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1 cm/s

1 mm/s

1 nm/s

1 μm/s

While applying Guass's Law assuming that the field is

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In different directions

Constant in direction

In all directions

None of these

Propagation of light in an optical fibre requires

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Total internal reflection

Continuous refraction

Both

None of these

Human body pressure measure in

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torr

pascal

mmH_g

Nm^-2

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

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

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constant

increasing

decreasing

none of them

Optical fibres are of

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Five type

Two type

Three type

None of these

The least distance of distinct vision for a normal eye is

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15 cm

25 cm

35 cm

1 m

Light and heavy bodies have equal K.E, then which one has greater momentum

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The heavy body

The light body

Both

Cannot be said

The escape velocity of moon in Kms^-1 is

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1.23

2.43

2.40

2.59

For an adiabatic expansion of a gas which of the following statement is false?

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Pressure of gas decreases

No heat is supplied to the gas

Work is done by gas

Entropy of gas is increased

The typical speed of human running is

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1 ms^-1

2 ms^-1

4 ms^-1

5 ms^-1

Two resistances 4Ω and 6Ω are in series they are in parallel with a 10Ω resistance.The equivalent resistance is

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5Ω

8Ω

12Ω

20Ω

The idea that all magnetic effects may be due to circulating currents (i.e moving charges) Was first held by

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Ampere

Faraday

Lenz

Gauss

A ball whose kinetic energy is E,is thrown at an angle of 45° with the horizontal.its kinetic energy at the highest point of its flight will be

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E

F/√2

E/2

Zero

The matter and energy are equivalent, was proposed by

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Newton

Einstein

Maxwell

None of these

The region of plasticity represents

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Proportional limit σ_p

Elastic limit σ_e

UTS (ultimate tensile strength σ_n)

None of these

The Physical quantity which has the dimensional formula M¹T^-3 is

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Surface tension

Solar constant

Density

Compressibility

The escape velocity of Mars in Kms^-1

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2.89

3.99

5.00

5.23

The fringe spacing varies directly with

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Distance L

Light of wavelength λ

Phase coherence

All of these

The moment of linear momentum is called

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Impulse

Torque

Angular momentum

Couple

The fundamental frequency in a stretched string is 10 Hz. To double the frequency, the tension in it must be changed to:

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T₂ = 2T₁

T₂ = 4T₁

T₂ = T₁

none of these

Brittle is the property of the substance in which a material undergoes

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Elastic deformation

Plastic deformation

Ultimate tensile strength limit

None of these

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

Which of the following quantities is a vector

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Volume

Temperature

Displacement

Density

A bar of length L, cross-section A and Young's modulus Y, is pulled by a force F from both ends so as to produce an elongation x. Then:

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x∝1/L

x∝A

x∝1/A

x∝Y

Rate of change of momentum is called

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impulse

force

torque

momentum

According to the Huygen's principle, the secondary wavelets propagate in the forward direction with a speed equal to

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speed of wave motion

speed of medium

speed of electrons

speed of protons

Propagation of light 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

Change in entropy is positive when heat is

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Removed

Added

Remains as is it

None of these

Which of the following is the relation of centripetal force?

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mv²/r

mv/r

mv³/r

mv³/r³

A ballistic missile is

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Unpowered

Unguided

Both

None of these

The multi-mode step index optical fibre, the central core has

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high refractive index and low density

low refractive index and density

low refractive index and low density

high refractive index and high density

Two different gases are enclosed in two different vessels at same pressure. If r₁and r₂are their densities then ration of their rms speed is equal to

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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

In blood red cell concentration is ______%.

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25

35

40

50

Force due to water flow is

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Ma/t

Mv/t

m/t

mt/v

If the earth suddenly stops rotating the value of 'g' at equator would:

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Decrease

Remain unchanged

Increase

Become zero

A device which convert DC into AC is calleD)

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Invertor

Generator

Rectifier

Motor

In a semi-conductor material, current flows due to

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positive charge

negative charge

both of them

none of them

Age of the Earth is

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14 × 10¹⁷ sec

1.4 × 10¹⁹ sec

1.4 × 10¹⁷ sec

1.4 × 10¹⁵ sec

SI unit of work is

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N-m

N-m²

N-ms^-1

N-ms^-2

When a gas is compressed:

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Its internal energy decreases

Its temperature decreases

Its temperature increases

None of these

The work done in an equipotential surface is

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Maximum

Infinite

Zero

None of these

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

One coulomb of charge is created by

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10 electrons

1.6 x 10^-19 electrons

6.25 x 10¹⁸ electrons

6.25 x 10²¹ electrons

According to boyle's law, volume of a given mass of a gas is

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Inversely proportional mass at constant pressure

Directly proportional to pressure at constant temprerature

Inversely proportional pressure at constant temprature

None of these

If the earth suddenly shrinks to half of its present radius the acceleration due to gravity will be

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g/2

4g

g/4

2g

The transmitter in optical fiber system contains a device called

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LED

Diode

Transistor

None of these

Newton's first law of motion is also known as

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Law of motion

Law of mechanics

law of inertia

None of these

The petrol engine works on the basis of

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Kelvin statement

Clausius statement

Carnot cycle

First law of thermodynamics

Wavelength of red color as compared to that of violet color is

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Smaller

Longer

Equal

None of these

The SI unit of strain is

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N

dynes

pascal

dimensionless

No body begins to move or comes to rest of itself said by

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Thomos Young

Abu Ali Sena

Newton

None of these

The number 0.0023 should be expressed as

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0.023 × 10^-2

0.23 × 10^-4

2.3 × 10^-3

None of these

The limit of which a microscope can be used to resolve details of an object, demands

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Wider objective and light of short wavelength

Narrow objective and light of short wavelength

Narrow objective and light of longer wavelength

None of these

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

The components of a fibre optic communication system is/are

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At transmitter

An optical fibre

Receiver

All of these

The SI unit of power is

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Joule

Watt

Pound

None of these

The lower refractive index the fibre core has

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1.48

1.40

1.54

1.42

In everyday life, when two balls collide then after collision, they the velocities as before the

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greater than the velocities as before the impact

equal to the velocities as before the impact

less than the velocities as before the impact

none of them

The expression of energy stored in an inductor of length L and current I can be expressed by a relation

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1/2 LI²

1/2 I²L

1/2 I²L²

1/2 IL

Deep water almost runs still when surface water flow in rivers.What does it explains

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Magnus effect

Equation of continuity

Surface energy

Bernoulli's equation

Distance traveled by a body falling from rest in the first,second and third second is in the ratio of

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1 : 2 : 3

1 : 3 : 5

1 : 4 : 9

None of the above

In launch mass of the rocket fuel is

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70%

80%

more than 80%

90%

Two light sources obtained from single source are called

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non-coherent sources

coherent sources

monochromatic sources

spherical sources

One watt-hour is equivalent to

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3.6 x 10³ joule

3.6 x 10^-3 joule

6.3 x 10³ joule

6.3 x 10^-3 joule

The unit of coefficient of viscosity is

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kgm^-1s^-1

Nsm^-2

Poise

All of these

In order to increase the K.E of ejected photo electrons, there should be an increase in:

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Intensity of radiation

NoneI

Frequency of radiation

Both (b) & (c)

When observed by transmitted light, the central band of newton's ring system consists of:

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Bright circular ring

Dark circular ring

May be bright or dark circular ring

No interference bands

Nm^-2is approximately called:

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Telsa

Weber

Pascal

Watt

Guass

When the length and area of cross-section both are doubled, then its resistance:

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Will become half

Will remain the same

Will be doubled

Will become four times

Huygen principle is used to determine:

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Speed of light

Location of wavefront

About polarized and unpolarized light

None of them

A process in which no heat enters or leaves the system is called.

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Adiabatic process

Isothermal process

Isochoric process

None of these

The limit below which the Hooke s law holds well is called

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Yield point

Breaking stress

Tensile strength

Elastic limit

The typical speed of commercial automobile (max) is

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50 ms^-1

60 ms^-1

62 ms^-1

65 ms^-1

In must practical cases, the cold reservoir is at temperature

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Low temperature

High temperature

Room temperature

None of these

A body moving with uniform velocity has

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positive acceleration

negative acceleration

infinite acceleration

zero acceleration

Huygen's wave theory of light cannot explain

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Diffraction

Interference

Polarization

Photoelectric effect

The dimensions of Young's Modulus are

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[ML^-1T^-1]

[ML^-1T^-2]

[MLT^-2]

[ML^-2T^-1]

In carnot cycle, there are adiabats

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One

Two

Three

Four

To decrease timing uncertainly

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Increase number of vibration

Decrease number of vibration

Increase length of pendulum

Decrease length of pendulum

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

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New ton

Maxwell

Thomas young

Huygen

The size of the molecules in comparison with the separation between the molecules is

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Small

Very small

Extremely small

None of these

Bernoulli s equation applicable in the case of

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Streamlined flow of compressible fluids

Streamlined flow of incompressible fluids

Turbulent flow of compressible fluids

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

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γ = Δa/a

tan θ

γ = θ

All of them

The product of force and time is called

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Momentum

Force

Impulse

None of these

Which of the following is conservative field

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Electrostatic field

Frictional field

Viscous field

All of these

Torque of a force is a vector quantity, its direction is determined by

Choose an answer

Right hand rule

Knowing the direction of F

Knowing the position of origin

none of these

Which one of the following has only bulk modulus?

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Diamond

Glass

Tungsten

Water

To increase the magnification of a telescope

Choose an answer

The objective lens should be of large focal length and eyepiece should be of short focal length

The objective and eyepiece both should be of large focal lengths

Both the objective and eyepiece should be of smaller lengths

The objective should be small focal length and eyepiece should be of large focal length

Blood is an incompressible fluid having density nearly equal to

Choose an answer

Milk

Honey

Water

None of these

Two forces of 12 N and 8 N act upon a body.The resultant force on the body has a maximum value of:

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4 N

0 N

20 N

8 N

Which one is least multiple?

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exa

femto

atto

nano

The blood pressure of about 120 torr is called the

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Diastolic pressure

Systolic pressure

Minimum diastolic pressure

Dangerous blood pressure

The geo-stationary orbit, in which, the satellite remains

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In motion

Fixed

Synchronized with Earth

None of these

The time rate of change of velocity is called

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Initial velocity

Uniform velocity

Accelerations

None of these

Which of the following have same SI units

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Force

Impulse

Momentum

B and C

Fractional error in a measured quantity is determined by

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Measured value / Absolute error

Absolute error / Measured value

Measured value + Absolute error

Measured value - Absolute error

A car engine is based on the principle of

Choose an answer

Bernoulli's equation

Verturi relation

Torricelli;s theorem

None of these

The consumption of energy by a 60 watt bulb in 2 sec is

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60 J

120 J

30 J

0.2 J

The magnitude of velocity at any instant is

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Brownian motion confirms the truth of :

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Wave theory of light

Boyle's law

Kinetic theory of gases

Adiabatic process

If the acceleration due to gravity is 10 ms^-2 and the units of length and time are changed to kilometer and hour respectively,the numerical value of acceleration is

Choose an answer

360000

72000

36000

129600

The equations for uniformly accelerated motion for body moving at

Choose an answer

Acceleration

Constant acceleration

Instantaneous acceleration

None of these

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

Which light travels faster in optical fibres?

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visible light

ultraviolet

infra-red

any one of them

Critical angle of light passing from glass to air is minimum for

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Red

Green

Yellow

Violet

On a diffraction grating a large number of close parallel equidistant slits are ruled on it

Choose an answer

By hand

electronically

mechanically

none of them

The critical temperature of mercury is

Choose an answer

1.18 K

4.2 K

3.72 K

7.2 K

Joule-second is the unit of:

Choose an answer

Energy

Heat

Planck’s constant

None of these

The electrical conductivities of insulators are ranging from

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10^-5to 10^-10(Ω m)^-1

10^-10to 10^-15(Ω m)^-1

10^-5to 10^-15(Ω m)^-1

10^-10to 10^-20(Ω m)^-1

The idea of Michelsion's interferometer is based on the

Choose an answer

reflection of light

interference of light

refraction of light

all of them

The speed of sound in air is

Choose an answer

320 ms^-1

323 ms^-1

330 ms^-1

333 ms^-1

Acceleration of a body at any particular instant during its motion is known as

Choose an answer

average acceleration

uniform acceleration

instantaneous acceleration

all of them

A cylinder cannot roll on

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A rough horizontal plane

A smooth horizontal plane

A rough inclined plane

A smooth inclined plane

Conductors are those materials in which the free electrons

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Very large

Very small

Plenty of

None of these

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

Choose an answer

-4.5 KN

-2.5 KN

-3.7 KN

-4.3 KN

Gravitation is the property of matter which is

Choose an answer

External

Internal

Intrinsic

None of these

The systolic blood pressure comes when

Choose an answer

Vessel collapse

Cutting off the blood flow

None of these

All of these

The motion of a projectile is

Choose an answer

one dimension

two dimensions

three dimensions

four dimensions

Plane polarized light can be produced by:

Choose an answer

Simple reflection

Refraction

Selective absorption

All of these

A box of mass 2 kg is at rest on top of a 0.75m high table. The weight of the object is 19.6 N. if the object is moved so that it falls to the ground, what will be the weight of the object after it has fallen 0.1 metre distance?

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19.2 N

19.6 N

19.8 N

not possible to determine from the given information

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

Choose an answer

deformation

stretching

compressing

elasticity

Scientific notation which can be expressed in the

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Negative powers

Powers of ten

Decimals

None of these

If we increase the distance between two plates of the capacitor the capacitance will

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Increase

Decrease

Remain same

First increase then decrease

Acceleration means the speed of the body is

Choose an answer

Increasing

Decreasing

Just stop

None of these

Two sources are said to be coherent if they have:

Choose an answer

Same amplitude

Same wavelength

Definite phase relation with each other

None of them

The blood pressure inside is greater than the

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External atmospheric pressure

Internal atmospheric pressure

Both of them

None of these

A car travels first half distance between two places with a speed of 30 km/h and remaining half with a speed of 50 km/h.The average speed of the car is

Choose an answer

37.5 km/h

10 km/h

42 km/h

40 km/h

If a transverse wave has a speed of 10 m/ sec and frequency of 10 cycle/ sec itswavelength is:

Choose an answer

1 m

10^-2 cm

10 m

10 cm

Under same environment the measurement of a physical quantity gives different values. The error in measurement is called

Choose an answer

Random error

Systematic error

Physical error

Uncertainty

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

Choose an answer

0.521 × 10^-3

0.564 × 10^-3

0.594 × 10^-3

0.599 × 10^-3

The direction of angular acceleration is

Choose an answer

Opposite of the axis of rotation

Along the axis of rotation

Perpendicular to the axis of rotation

None of these

1 torr = --------------------

Choose an answer

1.20 Nm^-2

1.38 Nm^-2

1.33 Nm^-2

1.31 Nm^-2

A boy is dropped from a tower with zero velocity, reaches ground in 4s. The height of the tower is about

Choose an answer

80 m

20 m

160 m

40 m

Which type of the following force cannot do work, acting on a body

Choose an answer

Electric force

Gravitational force

Frictional force

Centripetal force

The twinkling of stars is due to

Choose an answer

The fact that stars do not emit light continususly

The refractive index of the earth's atmosphere fluctuate

Intermittent absorption of star light by its own atmosphere

None of these

A process which is carried at constant temperature and Boyle's law can be applied is called:

Choose an answer

Adiabatic process

Isothermal process

Isochoric process

None of these

The magnetism produced by electrons within an atom from motion/motions of electron.

Choose an answer

One motion

Two motions

Three motions

None of these

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

The approximate efficiency of liquid fuel rocket is

Choose an answer

49%

50%

48%

47%

A body of mass 100 g is rotating in a circular path of radius r cm with constant velocity.The work done in one complete revolution is

Choose an answer

100 rJ

(r/100)J

(100/r)J

Zero

A collision is an elastic collision in which

Choose an answer

Momentum and K.E. is conserved

Momentum is conserved and K.E. is not conserved

Momentum is not conserved and K.E. is conserved

None of these

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

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

Which of the following is not a projectile?

Choose an answer

a bullet fired from a gun

a spaceship

a football in air

an artillery shell

Bulk modulus for steel is

Choose an answer

60

120

160

170

Bats navigate and find food by:

Choose an answer

Ultrasonic

Echolocation

Refraction

Hotness and coldness of an object is represented in terms of:

Choose an answer

Heat

Temperature

Chemicial

None of these

In Milikan's oil drop experiment, the drag force on oil drop is

Choose an answer

F_D = 6ηrv_t

F_D = 6πηrv_t²

FD = 6πηr²v_t

FD = 6πηrv_t

The SI unit of stress is some as that of:

Choose an answer

Pressure

Momentum

Impulse

Change momentum

Force

The efficiency of a particle heat engine:

Choose an answer

can be 100%

Cannot be 100%

Is always zero

None of these

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

Choose an answer

Refracted from air to fiber

Continuously refraction

Totally reflected within the fiber

Both B and C

The light waves and radio waves differ in

Choose an answer

Speed

Frequency

Wavelength

Both B and C

The bottom of a container filled with liquid appear slightly raised because of

Choose an answer

Refraction

Interference

Diffraction

Reflection

Nms^-1 is the unit of

Choose an answer

Impluse

Power

Energy

Work

The young modulus of steel is greater than that of aluminium.

Keeping the statement above in mind state which of the following is true

Choose an answer

Steel requires a larger stress on it for a given strain than does aluminium

Aluminium requires more force than steel does to get a similar extension as steel

Steel requires less force than aluminium does to get a similar extension as aluminium

Steel requires a larger strain on it for a given stress than does aluminium

A single step index fibre can carry more than

Choose an answer

14 TV channels

14,000 phone calls

16 TV channels

a and b

The unit of surface energy per unit area may be expressed as

Choose an answer

Nm^-2

Nm^-1

Nm

Nm²

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

Choose an answer

Interference

Diffraction

Reflection

None of these

Which one of the following is polymer

Choose an answer

Polythene

Polystyrene

Nylon

All

For a quantity to be a vector it must has/have

Choose an answer

Magnitude and direction

Obey law of vector addition

Both (a) and (b)

Only (a)

Flow rate has SI unit

Choose an answer

m²/s

m/s

m³/s

m³/s²

On heating, it becomes a very viscous liquid at almost

Choose an answer

500 C^o

800 C^o

900 C^o

1000 C^o

The time taken by light for its passage from M to m and back is

Choose an answer

2c/d

d/2c

2d/c

d²/2c

The pair of quantities has same dimensions?

Choose an answer

Power, Work

Work, Torque

Impulse, Linear momentum

Both B and C

Stokes law is strictly obey by

Choose an answer

Ideal fluid

Real fluid

Both A and B

None of these

A fighter plane is chasing another plane,when it opens fire its speed

Choose an answer

Increases

Decreases

Remains constant

Its stops

Semi-conductor elements have atoms with

Choose an answer

2 valence electrons

3 valence electrons

4 valence electrons

5 valence electrons

Conductors are those materials in which energy gap is

Choose an answer

very large (several eV)

very narrow (= 1eV)

either of them

none of them

A test charge q is the charge which is

Choose an answer

Very small

Very strong

A point charge

All of them

The volt/metre is the unit of:

Choose an answer

Potential

Work

Force

Electric field intensity

Optical device used in spectrometer

Choose an answer

Simple microscope

Compound microscope

Telescope

Any of them

Torque will be zero if

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body is at rest

rotating with uniform angular velocity

zero angular acceleration

all of them

The magnitude of i² in scalar product is

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Zero

1

Less than 1

Greater than 0

Shear modulus for bone is

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15

40

50

80

Which one light source can travel faster through optical fibre is

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Infra red

Visible

Ultra violet

All of these

The study of nature has been classified into branches are:

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Two

Three

Four

None of these

On the ground the gravitational force on a satellite is W. What is the gravitational force on the satellite when at a height R/50,where R is the radius of the Earth

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1.02 W

1.00 W

0.98 W

0.96 W

In a uniform circular motion of a particle, the direction changes but not its

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Angular displacement

Magnitude of velocity

Force towards centre

b and c

A body will be in rotational equilibrium if

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Dielectric has the charge of the type inside it

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Moving charge

Static charge

Both a & b

None of these

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

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greater is its acceleration

smaller is its acceleration

smaller is its weight

zero is its acceleration