Question # 1

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

Choose an answer

Intensity of radiation

NoneI

Frequency of radiation

Both (b) & (c)

A pure semiconductor has:

Choose an answer

An infinite resistance at 0^oC)

A finite resistance which does not depend upon temperature

A finite resistance which decreases with temperature

A finite resistance which increase with temperature

Which electromagnetic wave would cause the most significant diffraction effect for an atomic lattice of spacing around 10^-10m?

Choose an answer

microwave

infrared

ultraviolet

X-ray

An airplane flies 400 m from north and then files 300 m south and then flies 1200 m upwards then net displacement is

Choose an answer

1200 m

1300 m

1400 m

1500 m

Identify the correct unit of pressure among t bese

Choose an answer

kgms^-1

kgm^-1s^-2

kgm²s^-2

kgm^-2s^-1

A diesel engine converts heat energy into work by

Choose an answer

35%

40%

35% to 40%

45%

Calculate entropy change when 1.0 Kg ice at 0°C melts into water at 0°C. Latent heat of fusion of ice L_f= 3.36 x 10⁵J Kg^-1

Choose an answer

1.18 x 10²JK^-1

1.20 x 10⁴J Kg^-1

1.23 x 10³JK^-1

1.23 x 10⁴J Kg^-1

Slope of velocity time graph gives

Choose an answer

Distance

Instantaneous acceleration

Instantaneous velocity

Instantaneous speed

The dichronic substances are used in the process getting plane polarized light

Choose an answer

Selective absorption

Refraction through crystals

Reflection from different surfaces

None of these

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

Choose an answer

1 : 2 : 3

1 : 3 : 5

1 : 4 : 9

None of the above

A physical quantity which has both magnitude and direction but does not satisfies parallelogram law of addition

Choose an answer

Must be a vector

May be both scalar and vector

Scalar

None

At what point/points in its path does a projectile have it minimum speed

Choose an answer

At the point of projection

At maximum height

All the point where it strikes the ground

None 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

The rotational analogue of mass in linear motion is

Choose an answer

Torque

Angular momentum

Moment of inertia

Weight

The escape velocity of Neptune in Kms^-1

Choose an answer

20.26

24.03

25.4

25.6

If a particle covers half the circle of radius R with constant speed then

Choose an answer

Momentum change is mvr

Change in KE is 1/2 mv²

Change in KE is mv²

Change in KE is zero

Newton's rings are:

Choose an answer

Rectangular

Spherical

Concentric circles

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

Choose an answer

96 j

192 j

384 j

768 j

According to WH Bragg and WL Bragg monochromatic beam of X-rays was reflected form a crystal plane is like a

Choose an answer

Smooth and regular

Mirror

Thin film

None of these

A motor operates at 20 rev/s. What is power delivered by it? If it supply a torque of 75 Nm

Choose an answer

75 W

85 W

90 W

9.4 x 10³W

The irregular flown of fluid is called

Choose an answer

Normal flow

Streamline flow

Turbulent flow

None of these

While dealing with the processes i thermodynamics, the working substances is usually:

Choose an answer

Oxygen gas

Hydrogen gas

Ideal gas

None of these

If a source of emf is traversed from positive to negative the potential change will be:

Choose an answer

Positive

Negative

Zero

Constant

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

As the droplet accelerates, the upward drag force on it

Choose an answer

Increases

Decreases

Suspended

None of these

One coulomb of charge is created by

Choose an answer

10 electrons

1.6 x 10^-19 electrons

6.25 x 10¹⁸ electrons

6.25 x 10²¹ electrons

The modulus of elasticity of a liquid is:

Choose an answer

Zero

1

Infinity

A value not one of those mentioned above

The temperature below which materials are superconductor is called as:

Choose an answer

Kelvin temperature

Critical temperature

Curie temperature

none of these

Relativistic mechanics was developed by

Choose an answer

Davison and Germer

Heisenberg

Max Planck

Albert Einstein

Wavelength of light of frequency 100 Hz is

Choose an answer

2 x 10⁶m

3 x 10⁶m

4 x 10⁶m

5 x 10⁶m

Moment of inertia does not depend upon

Choose an answer

Angular velocity

Mass

Position of axis of rotation

None of these

Examples of crystalline solids are:

Choose an answer

Copper

Zirconia

NaCI

All of these

Both A and B

In petrol engine, the fourth stroke is the

Choose an answer

Power

Compression

Exhaust

None of these

Arsenic antimony or phosphorus are impurities of

Choose an answer

p-type

n-type

May be p-type or n-type

None of these

In launch mass of the rocket fuel is

Choose an answer

70%

80%

more than 80%

90%

Ordinary light has components of vibrations in

Choose an answer

one direction only

two directions

four directions

all directions

Which of the following material have young and bulk modulus are same

Choose an answer

Brass

Bone

Aluminum

Steel

In carnot cycle, there are isotherms as

Choose an answer

One

Two

Three

Four

Which quantity has the same units as impulse?

Choose an answer

force

work

linear momentum

acceleration

Two charges are separated by 0.5 m. Now the 0.25 m distance between the two charges is reduced to half of the first distance, how would the electric force become

Choose an answer

4 times

8 times

12 times

16 times

When a body is subjected to some external force, deformation is produced in:

Choose an answer

Shape

Length

Volume

Any of these

None of these

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

Choose an answer

Electric force

Gravitational force

Frictional force

Centripetal force

A man pushes a wall but falls to displace it.He does:

Choose an answer

Negative work

Maximum positive work

Positive work but not maximum

No work

By calculating the area under the velocity time graph, we can find the

Choose an answer

Acceleration

Velocity

Distance

None of these

If the radioactive substance reduces to 𝟏 𝟏𝟔 PHYSICS of its original mass in 40 days then its half-life is:

Choose an answer

10days

20days

40days

4days

Which will be more effective in knocking a bear down

Choose an answer

A rubber bullet

Lead bullet of same momentum

A wood bullet

None of these

The speed of the secondary wavelets as mentioned in Huygen's principle is ________ the speed of propagation of the wave itself

Choose an answer

Equal to

Greater than

Smaller than

None of these

Shear modulus for aluminium is

Choose an answer

30

70

80

90

The unit of permittivity of free space ε_° is:

Choose an answer

Newton-metre²/coulomb

Coulomb/Newtonxmetre

Coulomb²/(Newtonxmetre)²

A gas is compressed adiabatically till its temperature is double. The ratio of its final to its initial volume is

Choose an answer

1/2

More than 1/2

Less than 1/2

Between 1 and 1/2

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

Choose an answer

diffraction

interference

polarization

reflection

The critical temperature T for is

Choose an answer

1.6 K

2.71 K

3.72 K

2.82 K

Identify the incorrect statement

Choose an answer

The distance between the objective and eye-piece is 16.02 cm

The angular magnification of the planet is 800

The image of the planet is inverted

The objective is larger than the eye-piece

The term Brownian movement refers to

Choose an answer

Irregular motions of small particles suspended in a fluid

Convection currents in a liquid or gas

Convection currents in a gas but not in a liquid

The stretching of a body beyond its elastic limit

If we move from equator to pole,value of g

Choose an answer

Increases

Decreases

Remains same

First (A) and then (B)

Curie is the unit of

Choose an answer

decay constant

activity

half-life

average life

Phenomenon of interference and diffraction support the:

Choose an answer

Quantum nature of light

Tranverse nature of light

Wave nature of light

Complex nature of light

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

Choose an answer

4.9 ms^-1

9.8 ms^-1

2 x 9.8 ms^-1

4 x 9.8 ms^-1

Ratio of moment of inertia of two objects A and B is 2:3 which of the following is the ratio of torques of A and B respectively. If both are being rotated with constant angular acceleration

Choose an answer

3:4

2:3

3:2

4:3

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

Choose an answer

1.75 days

3.5 days

7 days

14 days

Deceleration means the speed of the body is

Choose an answer

Increasing

Decreasing

Just moving

None of these

A count rate 240 per minute reduces to 30 counts per min in 1 hour. The half-life of source is:

Choose an answer

20min

60min

80min

90min

The dimensional formula of angular velocity is:

Choose an answer

M^°L^°T^-1

MLT^-1

M^°L^°T^-1

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

Choose an answer

The area of the orifice

The height of liquid above the orifice

The density of liquid

Both A and C

Two 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

Choose an answer

Find the average speed of oxygen molecule in the air at S.T.P

Choose an answer

591 ms^-1

461 ms^-1

396 ms^-1

372 ms^-1

If a charged spherical conductor of radius 10 cm has potential V at a point distance 5 cm from its centre,then the potential at a point distance 15 cm from the centre will be

Choose an answer

1/3 V

2/3 V

3/2 V

3 V

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

The SI unit of stress is

Choose an answer

Nm²

Nm

dynesm^-1

N

An Earth satellite in a circular orbit of 384000 km. What is its velocity in that orbit take me = 6.0 × 1024 Kv R_e = 64000 km

Choose an answer

2.57 kms^-1

1.1 kms^-1

1.01 kms^-1

1.07 kms^-1

The velocity of efflux is 100 m/sec and area of hole is 0.06 cm²how much volume of water will flow out of hole in one second

Choose an answer

6.0 x 10-⁴m³

6.0m³

600m³

6.0cm³

Power of a lens is equal to

Choose an answer

Focal length in meters

Reciprocal of focal length expressed in meters

Double the focal length

Half the focal length

In carnot cycle, there are adiabats

Choose an answer

One

Two

Three

Four

In projectile motion the vertical acceleration is

Choose an answer

Zero

Maximum

'g'

None of these

Venturi meter measures

Choose an answer

Fluid density

Rate of flow of fluid

Speed of fluid

All

Two charges are placed a certain distance apart in air when a dielectric sheet is placed between them, the electro static force between them will

Choose an answer

Decrease

Increase

Remain unchanged

Become zero

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

Choose an answer

acceptor

donor

either of them

none of them

The maximum drag force on a falling sphere is 9.8 N,it weight is

Choose an answer

1 N

9.8 N

4.9 N

Cannot be calculated

In proportional limit (σ) of material, the stress increases with strain

Choose an answer

Linearly

Constant

Abruptly increases

None of these

When a movable mirror moves λ/4 distance and the light used is 400 nm, then the distance measured highly precise is

Choose an answer

100 nm

10^-4 nm

10^-6 nm

10^-5 mm

The effect is to increase the inflation the bag is

Choose an answer

To compress the blood vessels

To increase external pressure

To cut off the flow of blood

All of these

If L and R denote inductance and resistance respectively.then the dimensional formula of L/R is:

Choose an answer

(M°L°T°)

M°L°T°

(M²L^°T²)

(MLT²)

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

A man fires a bullet of mass 200 g at a speed of 5 m/s.The gun is of one kg mass.by what velocity the gun rebounds backwards?

Choose an answer

0.1 m/s

10 m/s

1 m/s

0.01 m/s

The approximate efficiency of fossil fuel power plants is

Choose an answer

20 - 27%

30 - 40%

40 - 50 %

40 - 42%

The mass of the object is a quantitative measure of its

Choose an answer

speed

velocity

acceleration

Inertia

Which one is ferromagnetic

Choose an answer

Ferries

Cobalt

Nickel

All

The magnifying power of an instrument is expressed in

Choose an answer

Radians

Degrees

No units

None of these

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

Choose an answer

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

The negative half cycle of input A.C.

The complete cycle of

All of the above

If the stress increased on a material is beyond the yield strength of the material is called

Choose an answer

Plasticity

Elasticity

Still in elasticity

None of these

Which of the following quantities is a vector

Choose an answer

Volume

Temperature

Displacement

Density

a constant force F is applied to keep the particle moving with uniform velocity V.Then the power required is

Choose an answer

1/2 FV²

FV²

FV

F/V

The velocity of light in vacuum can be changed by changing

Choose an answer

Frequency

Amplitude

Wavelength

None of these

During a negative β-decayv

Choose an answer

An atomic electron is ejected

A neutron in the nucleus decays emitting an electron

An electron which already present within the nucleus is ejected

A part of binding energy of nuclei is converted into electron

The valence energy band may be either

Choose an answer

Completely filled

Partially filled

a and b

All of them

As we go above the surface of earth the value of 'g'

Choose an answer

Increase

Remain Constant

Decrease

Increase slightly

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

Choose an answer

average velocity

uniform velocity

instantaneous velocity

variable velocity

The maximum energy of the photoelectrons depends upon:

Choose an answer

Frequency of incident light

Intensity of incident light

Nature of metal

Both (a) & (c)

Light waves produce interference when

Choose an answer

source are monochromatic

source are phase coherent

sources are close together

all of them

If both the length and radius of the wire are doubled,how does the modulus of elasticity change?

Choose an answer

Becomes one fourth

Halved

Doubled

Remains unchanged

Unit of angular displacement is

Choose an answer

Degree

Revolution

Radian

All

Motion of rocket is based upon

Choose an answer

Newtons third law of motion

Law of conservation of momentum

Newtons law of gravitation

Both (a) and (b)

Which of the following quantity is dimensionless?

Choose an answer

Gravitational constant

Plank's constant

Power of lens and gas constant

None of these

How many types of the optical fibres are

Choose an answer

One

Two

Three

Four

To get higher magnification we must use

Choose an answer

Simple microscope

A convex lens

A compound microscope

All of these

Diesel engine coverts ____________ of available heat energy into work.

Choose an answer

20% to 25%

25% to 30%

30% to 35%

35% to 40%

Dimensions of impulse are similar to the dimensions of

Choose an answer

torque

work

force

momentum

The binding energy per nucleon is:

Choose an answer

Greater for heavy nuclei

Least for heavy nuclei

Greatest for light nuclei

Greatest for medium nuclei

Choose an answer

r

r²

r³

None of these

Fraunhofer's lines commonly visible in the sun's spectrum are examples of

Choose an answer

Line emission spectrum

Line absorption spectrum

Band emission spectrum

Band absorption spectrum

The SI units of impulse are

Choose an answer

Nm

Nm²

Nm^-1

Ns

Solids having partially field conduction bands are

Choose an answer

Insulator

Semiconductor

Super conductor

Semi conductor

Find the total displacement of a body in 8 seconds starting from rest with an acceleration of 20 cm/s²

Choose an answer

0.064 m

640 cm

64 cm

64 m

When the second condition of equilibrium is satisfied, the body will be in

Choose an answer

complete equilibrium

translational equilibrium

rotational equilibrium

all of them

When a shell explodes in mid-air, its fragments fly off in

Choose an answer

One direction

Opposite direction

Different direction

None of these

N-type crystal is

Choose an answer

Neutral

Positively charged

Negative charged

None of these

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

Choose an answer

1.6 × 10^-3

1.595 × 10^-3

1.67 × 10^-3

1.69 × 10^-3

The number of electrons in a nucleus X of atomic number Z and mass number A is:

Choose an answer

A

W

Z

Y

The quantity F x t is called as

Choose an answer

momentum

velocity

acceleration

impulse

An electric field can deflect

Choose an answer

Neutrons

X-Rays

γ-Rays

α-Rays

The pattern of a crystalline solid is:

Choose an answer

One dimensional

Two dimensional

Three dimensional

Either A or B

None of these

Power is defined as

Choose an answer

P = ΔV/Δt

P = ΔW/Δt

P = mV/t

P = mt/V

Analyzer is use to

Choose an answer

Polarize the light

Un-polarize the light

Check whether the light is polarized or un polarized

Rotate the plane of polarized light

Stoke's law holds for bodies of the shape

Choose an answer

Spherical

Rectangular

Oblog

All of these

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

Choose an answer

Minimum stress

Maximum

Yield stress

Plastic stress

The terminal velocity of a drop of water of radius 1 x 10^-3 m moving through air (Given that h = 19 x 10^-6 kgm^-1s^-1)

Choose an answer

114.6 ms^-1

114.6 kms^-1

11.46 ms^-1

1.146 ms^-1

In semiconductors at 0 K the valence band is

Choose an answer

Completely filled

Partially filled

No

Yes

If λ = 589 nm d=1.0 mm L=225 cm then fringe spacing ΔY is given by

Choose an answer

1.76 mm

1.80 mm

1.37 mm

1.33 mm

Indicate which pair of physical quantities given below has not the same units and dimensions?

Choose an answer

Momentum and impulse

Torque and angular momentum

Acceleration and gravitational field strength

Pressure and modulus of elasticity

A ballistic missile moves under the result of the superposition of

Choose an answer

one independent motion

two independent motions

one dependent motion

two dependent motions

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

Choose an answer

Centripetal

Centrifugal

Radial

Tangential

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

Pressure exerted by a gas on the walls of its container is due to

Choose an answer

Adhesion between the gas molecules and the container

Cohesion between the gas molecules and the container

Collision between the gas molecules and the container

Surface tension of the gas

The dimensions of the quantities in one of the following pairs are the same.identify the pairs.

Choose an answer

Torque and work

Angular momentum and work

Energy and Young's modulus

Light year and time

If the mass and radius of a planet are doubled, then acceleration due to gravity on its surface will become

Choose an answer

One fourth

One half

Double

Four times

Bulk modulus for lead is

Choose an answer

2.9

7.7

9.3

15.6

Which one is a vector quantity?

Choose an answer

Work

Density

Momentum

Pressure

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

Choose an answer

Parallel to each other

Perpendicular to each other

In between two positions

None of these

Fractional error in a measured quantity is determined by

Choose an answer

Measured value / Absolute error

Absolute error / Measured value

Measured value + Absolute error

Measured value - Absolute error

Geothermal energy can be obtained from the heating rocks by the

Choose an answer

Igneous rocks

High temperature water

Decay of radioactive element

All of these

The angle between A and B is θ.The value of the triple product A,(B x A) is:

Choose an answer

A²B

Zero

A²B sin θ

A²B Cos θ

Unit of dielectric constant of medium is

Choose an answer

Coulombs /Newton-meter

Newton-meter²/coulomb²

coulomb²/ (Newton-meter)²

None of the above

Scientific notation which can be expressed in the

Choose an answer

Negative powers

Powers of ten

Decimals

None of these

Which of the following is equal to:

joule x ohm /volt x second?

Choose an answer

Ampere

Volt

Watt

Tesla

The physical quantity, which produces angular acceleration is called

Choose an answer

Centripetal force

Torque

Angular velocity

Moment of inertia

In the Newton's ring, as we proceed towards the periphery of the lens, the thickness of air film

Choose an answer

gradually decreases

gradually increases

suddenly becomes zero

all of them

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

Choose an answer

concave lens

convex lens

both of them

either of them

The diodes works on

Choose an answer

A.C

D.C

both A and B

None of these

By convention, the torques are taken as negative if they are in the

Choose an answer

downward direction

leftward direction

clockwise direction

anticlockwise direction

Two bullets are fired simultaneously,horizontally and with different speeds from the same place.Which bullet will hit the ground first?

Choose an answer

The faster one

Depends on their mass

The slower one

Both will reach simultaneously

A church organ consist of open ended pipes ranging from 4m to 4 mm, if the speed ofsound is considered as 400 m/s then the min and max frequency is:

Choose an answer

400 Hz and 4 kHz

100 Hz and 100 kHz

50 Hz and 50kHz

400 Hz and 400 kHz

Which of the following cannot be polarized?

Choose an answer

x-rays

light rays

sound waves

ultraviolet rays

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

Choose an answer

Zero

Minimum

Maximum

None of these

Time between the normal heart beats is

Choose an answer

8 × 10^-1 sec

_{8 × 10}^-2_sec

8 × 10^-3 sec

None of these

Michelson's interferometer is an instrument that is capable of measuring distance with

Choose an answer

low precision

high precision

extremely high precision

extremely low precision

Which of the following converts electrical signals into light signals?

Choose an answer

optical fibre

receiver

reflector

transmitter

In the Young's double slit experiment the separation between the slits is halved and the distance between the slits and the screen is doubled the fringe width is

Choose an answer

Halved

Unchanged

Doubled

Quadrupled

On a rainy day if there is an oil drop on tar road colored rings are seen around this drop This is because of

Choose an answer

Interference pattern produced due to thin oil film

Diffraction pattern

Polarization

Total internal reflection of light

The setting of Newton's rings is

Choose an answer

A Plano convex lens and the plane glass plate

A Plano convex lens and simple glass sheet

A Plano convex lens (long focal length) and the plane of glass plate

None of these

Which effect provides direct experiment evidence that light is a transverse rather than a longitudinal,wave motion?

Choose an answer

Light can be diffracted

Two coherent light waves can be made to be interfere

The intensity of light from a point source falls off inversely as the square of the distance from the source

Light can be polarized

The speed of a falcon in a dive is

Choose an answer

23 ms^-1

37 ms^-1

40 ms^-1

43 ms^-1

In a semiconductor,the mobility of holes is

Choose an answer

Greater then electrons

Less than electrons

Equal to electrons

None

In the doping process, the ratio of the doping atoms to the semi-conductor atom is

Choose an answer

1 to 10

1 to 10³

1 to 10⁶

1 to 10⁹

Which of the following is not the unit of time

Choose an answer

Leap year

Lunar month

Solar day

Parallactic second

Work done by a body when it covers some distance in suitable direction, may be

Choose an answer

Positive

Negative

Zero

All of these

An instrument called a sphygmomanometer measure

Choose an answer

Density of water

Blood pressure

Milk density

None of these

The self product of two vectors in cross product is

Choose an answer

Zero

Square of vector

Only same vector

None of these

If N is the number of rulings on the grating, then the resolving power in the mth order diffraction equals to

Choose an answer

R = N × m

R = N/m

R = m/N

R = N × m²

A prism splits a beam of white light into seven component colors. This is so because

Choose an answer

Phase of different colors is different

Amplitude of different colors is different

Energy of different colors is different

Velocity of different colors is different

The solids which have structure in between order and disorder are called

Choose an answer

amorphous solids

polymeric solids

crystalline solids

all of them

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

Choose an answer

8.85 × 10^-10 C² N^-1 m^-2

8.85 × 10^-11 C² N^-1 m^-2

8.85 × 10^-12 C² N^-1 m^-2

8.85 × 10^-13 C² N^-1 m^-2

Debye is the unit of

Choose an answer

Magnetic dipole moment

Electric dipole moment

Density

RMS velocity

Which one is least multiple?

Choose an answer

exa

femto

atto

nano

The SI unit of stress is same as that of.

Choose an answer

Momentum

Pressure

Force

Length

When the fuel ignited it turns to a gas at

Choose an answer

Low pressure

High pressure

Extremely high pressure

None of these

Pure form of semiconductor is called

Choose an answer

Extrinsic semiconductor

Intrinsic semiconductor

N type

P type material

The Bernoulli's equation often expressed in

Choose an answer

P + ρV² + ρgh = constant

P + 1/2 ρV + ρgh = constant

P + 1/2 ρV² + ρgh = Constant

P + 1/2 ρV² + gh = constant

The fluid which is incompressible and have streamline flow is called _________ fluid

Choose an answer

Ideal

Viscous

Non ideal

None of these

Moment of inertia of a sphere is

Choose an answer

1/3 mr²

3/4 mr²

4/5 mr²

2/5 mr²

Base quantities are

Choose an answer

Scalars

Vectors

Both

None of these

When heat is added to the system, the entropy change is:

Choose an answer

Positive

Negative

Zero

None of these

Thermal and mechanical equilibrium is maintained all the time so that each process is

Choose an answer

Reversible

Perfectly reversible

Irreversible

None of these

A man is an elevator descending with acceleration will conclude his weight has

Choose an answer

Increase

Decrease

Remain constant

Become zero

The optical fibre has a layer over the central layer is called cladding of refractive index

Choose an answer

High

Low

Very high

None of these

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

Choose an answer

the gravitational field is uniform

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

weight is unaltered by attitude

weight of an object varies with its distance from earth

Most motorbikes have ____________ cylinder/s engine but cars usually have _________ cylinders on the same crankshaft.

Choose an answer

Four , Six

One , four

two , five

None of these

Sadi Carnot described an ideal engine using only isothermal and adiabatic process in

Choose an answer

1820

1825

1837

1840

Intensities of the two waves of light are I and 4I.The maximum intensity of the resultant wave after superposition is

Choose an answer

5I

9I

16I

25I

The wavelength of light observed on the earth, form a moving star is found todecrease by 0.05%. Relative to the earth the star is

Choose an answer

moving away with a velocity of 1.5 x 10⁵m/s

moving away with a velocity of 1.5 x 10⁴m/s

coming closer with a velocity of 1.5 x 10⁵m/s

coming closer with a velocity of 1.5 x 10⁴m/s

If a body has zero acceleration, it means that it is

Choose an answer

At rest

Uniform velocity

Both

None of these

The angular momentum of a particle is given as

Choose an answer

L = m × p

L = p × V

L = r × p

None of these

A mode of propagation of light through optical fibre in which the light within the fibre is

Choose an answer

Reflected

Refracted

Continuously refracted

None of these

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

An inertial frame of reference in which acceleration is

Choose an answer

Very high

Very very low

Zero

None of these

The typical speed of Moon around the Earth is

Choose an answer

1000 ms^-1

2000 ms^-1

3000 ms^-1

4000 ms^-1

A body of mass 'm' is moved to a height 'h' equal to the radius of the earth.The increase in potential energy is

Choose an answer

2 mgR

mgR

1/2 mgR

1/4 mgR

The magnitude of the scalar product is

Choose an answer

AB sin Φ

AB cos Φ

AB

None of these

The bands below the valence band are

Choose an answer

completely filled and play active part in conduction process

completely filled and plays no part in conduction process

not completely filled and play active part in conduction process

not completely filled and play no part in conduction process

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

Choose an answer

Motion

Displacement

Distance

None of these

Einstein inferred that is gravitational acceleration and inertial acceleration are equivalent, gravity must

Choose an answer

Reflect light

Bend light

Turn light

None of these

Laws of motion are not valid in a system which is

Choose an answer

inertial

non-inertial

at rest

moving with uniform velocity