Question # 1

The angular speed of a flywheel making 120 revolutions/minute is:

Choose an answer

π rad/s

2π rad/s

4π rad/s

6π rad/s

Si system is based upon ______ kind of units

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One

Two

Three

Four

In n-type substances the minority carriers are

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Holes

Electrons

Neutrons

None

Elastic deformation of a material is the deformation which is

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Permanent

Temporary

Some what permanent

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

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

Choose an answer

0.954 × 10^-3

1.000 × 10^-3

1.012 × 10^-3

1.014 × 10^-3

The ideal gas obey gas law at:

Choose an answer

Low tempratures and high pressures

High temperatures and low pressures

All temperatures and pressures

None of these

The light signal in graded index fibre is totally confined due to

Choose an answer

Total inernal reflection

Continuous refraction

Both a and b

Dispersion

Which does not show polarization

Choose an answer

Longitudinal wave in gas

Transverse wave in gas

Both a and b

None of these

The body is in a dynamic equilibrium when it is

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At rest

In motion

In uniform motion

Acceleration motion

Examples of polymeric substances are:

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Plastic

Synthetic rubbers

Zirconia

All of these

Both A and B

One light year = ______.

Choose an answer

9.5 x 10^-15m

9.5 x 10¹⁵m

9.5 x 10^-12m

9.5 x 10¹²m

Blood is an incompressible fluid having density nearly equal to

Choose an answer

Milk

Honey

Water

None of these

SI unit of potential difference is volt it can be written as

Choose an answer

JC^-2

JC^-1

JC

J.A

An optical fibre with its protective case may be typically 6.0 mm in diameter and yet it can replace bundle of copper of diameter

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6.79 cm

6.95 cm

7.52 cm

7.62 cm

A body is moving with a uniform speed along a straight line.Its angular momentum with respect to a fixed point away from the line

Choose an answer

Increases as the body moves away from the point

Decreases as the body moves away from the point

Is zero

Is constant and does not depend on the position of the body

The characteristics of steady flow is

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Non-viscous

Incompressible

Streamline

All of these

Linear momentum is a

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fixed quantity

constant quantity

scalar quantity

vector quantity

Time of flight of projectile is

Choose an answer

Vi sinθ /g

2Vi Sinθ /g

2Vi sinθ/g

None

Two charges are placed a certain distance apart in air. When a metallic sheet is placed between them the electric static force between them will

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Decrease

Increase

Remains unchanged

Become zero

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

The SI unit of stress is

Choose an answer

Nm²

Nm

dynesm^-1

N

For average velocity of a body, it has

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Straight path

Curved path

Steady motion or variable

All of them

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

Speed of light in vacuum is

Choose an answer

0 ms^-1

3 x 10⁸ms^-1

1.5 x 10⁸ms^-1

None of these

In multimode graded index fibre core and cladding has boundary

Choose an answer

Noticeable

No noticeable

No boundary

None of these

The original source of waves is

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Moon

Sun

Wind

None of these

At what temperature adiabatic change equivalent ot isothermal change

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0°C

0K

Critical temperature

Above critical temperature

Geometrical optics cannot give following characteristics for a microscope

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Image position

Image size

Resolution of image

Any of the above

At certain speed, the time taken by light in moving from M to m and back to M is equal to the time taken by

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Face 4 to 1

Fact 6 to 1

Face 3 to 1

Face 2 to 1

A body is subjected to a force such that its velocity is doubled then

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Its acceleration is also doubled

Its momentum is also doubled

Its potential energy is also doubled

Its kinetic energy is also doubled

The waste material of the process in a digester is a good

Choose an answer

Inorganic fertilizer

Organic fertilizer

Waste disposal

b and c

As 1 ohm x 1 farad = 1 second For MΩ x PF =

Choose an answer

Second

ms

μ s

Ms

For a freely falling elevator

Choose an answer

a = W

a = T

a = 0

a = g

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

Choose an answer

New ton

Maxwell

Thomas young

Huygen

If the direction of the applied force is reversed then

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Its torque remain unchanged

The magnitude of its torque changes and direction of the torque remains the same

The magnitude of its torque remains the same but the direction of the torque reverses

Torque is also reversed

The direction of the acceleration is the same as that of

Choose an answer

Displacement

Velocity

Both

None of these

The energy of molecular motion appears in the form of

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Friction

Heat

Viscosity

Potential energy

When body is connected to earth then electrons from the earth flow into the body. It means that the body is

Choose an answer

Uncharged

An insulator

Positively charged

Negatively charged

1 torr is expressed as

Choose an answer

136.5 Nm^-2

13.3 Nm^-2

133.3 Nm^-2

130.5 Nm^-2

Approximate power of Jumbo. Let Aircraft in watts.

Choose an answer

1.2 × 10⁶

1.3 × 10⁸

1.2 × 10⁸

1.1 × 10⁹

The whole structure obtained by the repetition of unit cells is called:

Choose an answer

Crystal lattice

Amorphous solid

Polymeric solid

Polystrene

None of these

The approximate efficiency of incandescent lamp is

Choose an answer

6%

8%

5%

9%

Force of friction between different layers in present in

Choose an answer

Gases

Solids

Liquids

Both A and C

Sunset makes sky appears reddish because of:

Choose an answer

Diffraction of sun rays

Refraction of light

Scattering of light from dust particles

Polarization of ligth

A mass of 5 kg moves with an acceleration of 10m s^-2, the force applied is

Choose an answer

10N

50N

2N

20N

Magnetic field inside a solenoid is:

Choose an answer

) Directly proportional to current

Inversely proportional to current

Directly proportional to its length

Inversely proportional to total no of turns

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

Choose an answer

signal attenuation

number of signals carried per wire

cost of installation

none of the above

Diffraction of X-ray by crystals show that

Choose an answer

The intensity of X-rays

X-rays have very short wavelength

X-rays are electromagnetic waves

A-rays are just like visible light

Huygen's wave front which sends out secondary wavelets with a speed equal to

Choose an answer

Speed of propagation of the wave

Speed of propagation greater than wave

Speed of propagation less than the wave

None of these

An accurate measurement is the one which has

Choose an answer

Percertainity

Less percentage uncertainty

Less fractional uncertainty

b and c

Amorphous solids are called

Choose an answer

Polymeric

Crystal

Glassy solids

All

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

Choose an answer

Initial velocity

Angle θ < 90^o

Falling under gravity

All of these

If the magnification M₁ = 20.0 for objective and M₂ = 12.0 then total magnification is

Choose an answer

200

240

260

280

Bulk modulus for aluminium is

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40

70

75

95

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

Deceleration means the speed of the body is

Choose an answer

Increasing

Decreasing

Just moving

None of these

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

Choose an answer

1 cm/s

1 mm/s

1 nm/s

1 μm/s

Turn table is the plateform over which we place

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Diffraction grating

Prism

Glass slab

a and b

Which of the following pairs of electrical units are the units equivalent?

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Coulomb; As^-1

Farad ; C^-1V

Pascal: Nm^-2

Volt ; JC

For the measurement of temperature of the order of 400°C, we will prefer

Choose an answer

Hg thermometer

Alcohol thermometer

Pyrometer

Thermometer

A hole in a semi-conductor material is treated as

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positive charge

negative charge

neutral

none of them

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

Choose an answer

One joule

One erg

One electron volt

None of these

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

Which pair includes a base unit and a derived unit

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Candela,mole

Joule,pascal

Kilogram,meter

Second Newton

Earth is considered to be

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a non-inertial frame

an inertial frame

an accelerated frame

none of the above

If water rises 4 cm in a long thin tube because of capillary action then under corresponding conditions of use.the rise (in the tube) of a liquid whose density is 2 g/cm³ will be

Choose an answer

1 cm

2 cm

8 cm

None

The electric force between two charge placed in air is 2 Newtons. When placed in a medium of ∈_r = 80, the force reduces to

Choose an answer

0.019

0.029

0.025

0.03

Moment of inertia of an object does not depend upon

Choose an answer

Mass of object

Mass distribution

Angular velocity

Axis of rotation

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

Choose an answer

A telescope

Compound microscope

Simple microscope

None of these

Everything in the vastness of space is in a state of

Choose an answer

Rest

Motion

Perpetual motion

None of these

The dimensions of torque are

Choose an answer

ML²T^-2

MLT²

MLT^-1

ML²T²

The energy gap is insulators becomes very large and has the value

Choose an answer

Few electron volt (eV)

Some electron volt (eV)

Several electron volt (eV)

None of these

The units of angular acceleration is

Choose an answer

Radian

Radian per second

Radian per second²

None of these

Avogadro number is the no of molecules present in

Choose an answer

One liter of gas at STP

22.4 liter of gas at STP

22.4 mole of gas at STP

48.8 liter of gas at STP

The viscosity of glycrine is

Choose an answer

0.019x10^-9 Nsm^-2

0.801x10^-6 Nsm^-2

6.29x10^-3 N-sm^-2

6.29x10³ Nsm^-2

The theory which explains the vast diversity in an electrical behaviour of all types the materials is

Choose an answer

Free electron theory

Band theory

Theory based as chemical properties

None of these

Work done is a gravitational field along a closed loop is

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Maximum

Minimum

1

Zero

Two forces of magnitude 7 N and 5 N act on a particle at an angle θ to each other.θ can have any value.The minimum magnitude of the resultant force is

Choose an answer

12 N

8 N

2 N

5 N

An average energy used to make a car is

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4 × 10⁷ J

9 × 10⁹ J

7 × 10⁸ J

8 × 10⁹ J

The modulus of rigidity of a liquid is

Choose an answer

Zero

1

Infinite

None of these

A cable breaks if stretched by moe than 2mm, it is cut into two equal parts. How much either [art can be stretched without breaking?

Choose an answer

25 m

1 mm

2 mm

0.5 m

Interference and diffraction confirm:

Choose an answer

Particle nature

Wave nature

Dual nature

None of these

Optical device used in spectrometer

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Simple microscope

Compound microscope

Telescope

Any of them

On a diffraction grating which thing acts as a slit

Choose an answer

the lines which are ruled on it

the spacing between the lines

either of them

none of them

Rotational kinetic energy of a disc is

Choose an answer

K.E. _rot = 1/2 mV²

K.E. _rot = 1/3 mV²

K.E._rot = 1/4 mV²

None of these

A charge -4 μ C is at origin and +16 μ C is at a distance 3 m on positive x-axis the zero field is located at

Choose an answer

3 m along y=axis

3 m along negative x-axis

3 m along positive x-axis

6 m along negative x-axis

A frame of reference stationed on Earth is approximately an example of

Choose an answer

Inertial frame

Non-inertial frame

Every frame

None of these

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

Choose an answer

900 ms^-1

950 ms^-1

980 ms^-1

990 ms^-1

Magnification of a convex lens is

Choose an answer

M = p/d

M = p/q

M = q/p

None of these

Surface tension of water is due to

Choose an answer

Inter molecular attractions

Intermolecular spaces

Inter molecular repulsion

None of above

The unit of inductance is equivalent to

Choose an answer

∨xs/A

∨xA/s

∨ x s/v

∨/A x s

The colour of light is determined by is

Choose an answer

Wavelength

Frequency

Velocity

Amplitude

Assuming the earth as a sphere of radius 6400km the capacitance of earth is

Choose an answer

Infinite

Zero

771 μF

171 μF

For interference to occur the two light waves should be:

Choose an answer

Of two different frequencies

Coming from opposite directions

Of high intensity

Monochromatic

The light from the sun reaches to earth with wavefronts

Choose an answer

Spherical

Cylindrical

Plane

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

A semiconductor in its extremely pure form in known as

Choose an answer

Extrinsic semiconductor

Intrinsic semiconductor

Both a and b

None of these

Tick which of the following is not state variable:

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Heat energy

Pressure

Entropy

Volume

Carnot cycle is:

Choose an answer

Reversible

Irreversible

Sometimes A, Sometimes B

None of these

Bulk modulus for steel is

Choose an answer

60

120

160

170

The percentage uncertainties are when current I is following 0.84 ± 0.05 A due to potential difference 5.2 ± 0.1 V. The uncertainty of R is

Choose an answer

7.72 ± 0.5 ohm

6.62 ± 0.5 ohm

6.6 ± 0.5 ohm

None of these

Nicrom wire is an example of

Choose an answer

Non ohmic device

Ohmic device

Neutral device

Charged device

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

Choose an answer

Gas expand more than liquid

Gases are easily obtained

Gases are much lighter

Gases do not easily change their state

Which of the following radiation will be focused farthest from a convex lens

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X - rays

γ - rays

Microwaves

β - rays

The deflection by Einstein is as great as newtons is

Choose an answer

Twice

Thrice

Four times

Half time

Triple point of water is the state in which ice, water and vapour coexists in equilibrium and its occurs uniquely at pressure and temperature is

Choose an answer

one particular

just one

May be another

None of these

The volt is equal to

Choose an answer

C/q

N/m²

Joule/coulomb

Nm²/C

Light waves are:

Choose an answer

Mechanical waves

Electromagnetic waves

All of above

None of above

The Plano-convex lens used in the Newton's rings are of focal length

Choose an answer

Small

Long

Very large

None of these

The direction of torque is

Choose an answer

Along F

Along r

Perpendicular plant formed by F and r

None of these

The experimental evidence in support of wave theory in Huygen's time was

Choose an answer

not present

not convincing

convincing

none of them

Most widely used optical fibres are those which propagate light by

Choose an answer

total interval reflection

continuous refraction

both of them

none of them

The energy due to all the fossil fuels on the Earth is so small that, the energy reaching Earth in just days of sunlight which is

Choose an answer

5 days

10 days

30 dyas

60 days

Fluids resist force this property is called

Choose an answer

Stiffness

Strength

Ductility

Elasticity

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

Range of a projectile is R.when the angle of projection is 30°.Then the value of the other angle of projection for the same range is:

Choose an answer

45°

60°

50°

40°

Angular momentum of a particle is

Choose an answer

Parallel to its linear momentum

Perpendicular to its linear momentum

Inclined to its linear momentum

A scalar quantity

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

Choose an answer

12days

10days

22days

36days

The work done by the system on its environment is considered

Choose an answer

Natural

Positive

Negative

None of these

The conductivity of super conductor at critical temperature becomes

Choose an answer

Zero

1

Infinite

Negative

If the angle between r and F is 90°, then the torque is

Choose an answer

zero

minimum

maximum

infinite

The work done in placing a charge of 8 x 10^-18C on a condenser of capacity 100 μ F is

Choose an answer

32 x 10^-32 j

16 x 10^-32j

3.1 x 10^-26j

4 x 10^-10j

A force of 10N is required to move a body with a velocity 10 ms^-1the power developed is

Choose an answer

10 W

50 W

100 W

1000 W

The least count of stop watch is 0.10 sec,The time of 20 vibrations of pendulum is 40 sec The maximum possible percentage uncertainly in time period is

Choose an answer

0.016

0.10

0.001

0.005

Stress change the shape, volume or length of a body due to the

Choose an answer

Applied force

External force

Force

Force on unit area

The torque is taken as negative when it is

Choose an answer

Clockwise

Anticlockwise

Both

None of these

The equations for uniformly accelerated motion for body moving at

Choose an answer

Acceleration

Constant acceleration

Instantaneous acceleration

None of these

Which of the following is a non-conservative force

Choose an answer

Nuclear force

Elastic force

Electrostatic force

Viscous force

The centre of gravity of a body of an irregular shape lies

Choose an answer

At its centre

inside the surface

At the intersection of medians

All of these

In Young's double slit experiment, the widths of dark and bright fringes are

Choose an answer

different

equal

zero

variable

Wave length of red colour as compared to that of violet colour is:

Choose an answer

Smaller

Longer

Equal

None of these

Alexander graham bell transmits a voice message via a

Choose an answer

Beam of light

Telescope

Compound microscope

Mirror

The pattern of NaCI particles have a shape which is:

Choose an answer

Cubic

Body centred cubic

Simple cubic

Face centred

Both A and C

In an astronomical telescope the eye piece has the focal length f_e if

Choose an answer

Short

Long

Extremely long

None of these

The ratio of linear stress/linear strain is called as

Choose an answer

Young's modulus

Bulk modulus

Shear modulus

Modulus

Angle subtended at the centre of the circle by a body is called

Choose an answer

Angular velocity

Linear velocity

Angular displacement

All of these

A car moves for half of its time at 80 km/h and for rest half of time at 40 km/h.Total distance covered is 60 km.What is the average speed of the car?

Choose an answer

60 km/hr

80 km/hr

120 km/hr

180 km/hr

If the instant velocity does not change, the body is moving with a

Choose an answer

Initial velocity

Variable velocity

Uniform velocity

None of these

According to Stoke's law drag force depends on

Choose an answer

Initial velocity

Final velocity

Terminal velocity

Instantaneous velocity

Soap bubble looks colored due to

Choose an answer

Dispersion

Reflection

Interference

Any one of these

Pick out the wrong pair:

Choose an answer

Charge-coulomb

Temperature-thermometer

Pressure-barometer

sp.gravity-hygrometer

The dimensions of Planck's constant is equal to that of

Choose an answer

Energy

Momentum

Angular momentum

Power

Steel is more elastic than rubber because

Choose an answer

It is a metal

Its density is higher

Ratio of stress to strain is more

Ratio of stress to strain is less

When a body moves with a constant speed along a circle

Choose an answer

No work is done on it

No acceleration is produced in the body

No force acts on the body

Its velocity remains constant

For the normal setting of a telescope

Choose an answer

Only the object is at infinity

Only the final image is at infinity

Both the object and the final image is at infinity

Neither the object nor the final image has to be at infinity

If the unit of length, mass and time each be doubled, the unit of work is increased by

Choose an answer

2 times

6 times

4 times

8 times

A light body A and a heavy body B have equal linear momentum.Then the K.E.of the body A

Choose an answer

is equal to that of B

Is greater than that of B

Is smaller than that of B

Is zero

A pulse of light in the optical fibres represents the number

Choose an answer

0

1

2

3

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 electrons in the outermost shell are called

Choose an answer

Super electrons

Valance electrons

Full valance

Upper deep up

A steam turbine plant has boiler 427 C° and exhausts at 77°C what is the maximum possible efficiency

Choose an answer

60%

70%

50%

40%

The acceleration of the rocket is

Choose an answer

The charge determined by the Millikan's experiment is

Choose an answer

q = qvd/m

q = mvd/g

g = mgd/v

None of these

Microwaves are used because they travel in a

Choose an answer

Narrow beam

Straight line

Easily pass through Earth atmosphere

All of these

The K.E.of a light and a heavy object is same.Which object has maximum momentum?

Choose an answer

Light object

Heavy object

Both have the same momentum

Data is not sufficient

If g is the acceleration due to gravity on the surface of the earth, then the value of the acceleration due to gravity at height equal to R/2 from the surface of earth is (R is the radius of the earth)

Choose an answer

g/2

2/3 g

4/9 g

5/9 g

Einsteins theory say that gravity

Choose an answer

Follows inverse square law

Donot follow the inverse square law

Very weakly follow inverse square law

None of these

Angular acceleration is a

Choose an answer

Scalar quanity

Variable quantity

Vector quantity

None of these

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

Choose an answer

Initial velocity

Angleθ<90°

Falling under gravity

All of these

The angular momentum of a system of particles is not conserved

Choose an answer

When net external force is acting upon the system

When a net external torque is acting upon the system

When a net external impulse is acting upon the system

None of these

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

Choose an answer

2

4

8

Infinite

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

Choose an answer

6 m s^-1

2.45 m s^-1

2.25 m s^-1

4.45 m s^-1

The SI units of impulse are

Choose an answer

Nm

Nm²

Nm^-1

Ns

When m₂>> m₁and V_{2 = 0 then result of their velocities}

Choose an answer

V₂= 0 and V₁= V'₁

V'₁= -V₁and V'₂= 0

V₁= V₁and V₂= 0

None of these

The number of seconds in one year are

Choose an answer

3.154 x 10⁶

3.154 x 10⁵

3.154 x 10⁴

3.154 x 10⁷

The dot product of two vectors is negative when

Choose an answer

They are parallel vectors

They are anti-parallel vectors

They are perpendicular vectors

None of the above is correct

The number 1678.9 should be written in scientific notation as

Choose an answer

16.789 × 10³

1.6789 × 10³

1678.9 × 10³

None of these

If P is the pressure and V is the volume, Then PV will represent:

Choose an answer

Power

Work

Force

None of these

Can two lights of car can produce interference

Choose an answer

Yes

No

Partly produce interference

None of these

Which of the following have maximum ionization power?

Choose an answer

𝛼 −rays

𝛽 −rays

𝛾 −rays

Same for all

In projectile motion the vertical acceleration is

Choose an answer

Zero

Maximum

'g'

None of these

A string vibrates in 1 loop has frequency 25 Hz if it moves in 2 loops its frequencywould be:

Choose an answer

25 Hz

50 Hz

12.5 Hz

5Hz

The drag force increases as the speed of the object

Choose an answer

Decreases

Increases

Decreases rapidly

None of these

The phenomenon of diffraction can be exhibited by

Choose an answer

Polarized waves only

Un polarized waves only

Longitudinal waves only

All polarized or un polarized waves and longitudinal or transverse waves

The drag force increases as the speed of the object

Choose an answer

Decreases

Increases

Remains constant

None of these

the ratio of mean K.E of chlorine and oxygen molecules at same temperature is

Choose an answer

16 35.5

35.5 16

(35.2)²16

1 1

A chiminey works best when it is

Choose an answer

Tall

Exposed to air currents

Not tall but wide

a and b

Conductors are those materials in which the free electrons

Choose an answer

Very large

Very small

Plenty of

None of these

In case of reflection of ray within a denser medium, angle of incidnet is ______ -angle of reflection

Choose an answer

Greater then

Smaller then

Equal to

None of these

A driver in a lake wants to signal his distress to a person sitting on the edge of the lake flashing his water proof torch He should direct the beam

Choose an answer

Vertically up wards

Horizontally

At angle to the vertical which is slightly less than the critical angle

At an angle to the vertical which is slightly more than critical angle

The curie temperature of iron is called

Choose an answer

250°C

500°C

750°C

1000°C

First law of thermodynamic is generalization

Choose an answer

Law of conservation of mass

Law of conservation of energy

Law of heat exchange

None of these

A passenger lift accelerates upwards. What change would a passenger inside the lift standing on a weighing machine notice in the weight shown on the machine?

Choose an answer

a decrease in the reading on the scale

no change in the reading on the scale

an increase in the reading on the scale

an increasing in the weight

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 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

Which of the given pair have same dimension

Choose an answer

Stress, pressure

Elastic modules, pressure

Stress, elastic modules

All have same dimension

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

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2π

2π/r

2πr

None of these

The original source of fossil fuels is

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Geothermal

Biomass

Sun

None of these

If C_vdonotes molar specific heat at constant volume and𝜟 T is the change in temperature, then C_v𝜟T gives:

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Volume

Pressure

Energy

Entropy

Unit cell has a basic structure of

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One dimensional

Two dimensional

Three dimensional

None of these

When a bullet is fired by a gun, the gun move backward with a

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velocity less than that of the bullet

velocity equal to that of the bullet

velocity greater to that of the bullet

remains at rest

Force due to water flow in which the water of mass 'm' strikes the wall in time 't' then force F on the water is

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The artillery shells travels along parabolic paths under the influence of

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magnetic field

electric field

electromagnetic field

gravitational field

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

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Two

1/2

Zero

3/2

If force of friction is negligible, then acceleration of two free falling objects of different masses is

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The same

Different

Smaller mass has smaller acceleration

None of these

In which situation does diffraction occur?

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a wave bounces back from a surface

a wave meets another wave to produce a new wave

a wave passes from one medium into another

a wave passes through an aperture

The number of significant figures in all the given number 25.12.2009,4.156 and 1.257 x 10^-4 is

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1

2

3

4

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

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Increase to maximum

Reduce to minimum

Reduce to zero

None of these

The matter and energy are equivalent, was proposed by

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Newton

Einstein

Maxwell

None of these

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

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Red

Green

Yellow

Violet