Question # 1

The total linear momentum of an isolated system remains

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Constant

Variable

Zero

None of these

In laminar flow the velocity of the liquid in contact with walls of the tube is

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Zero

Maximum

Equal to critical velocity

None of these

Thermodynamics is the branch of physics deals with the conversion of heat energy into

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Electrical energy

Mechanical energy

Solar energy

None of these

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

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Initial velocity

Angleθ<90°

Falling under gravity

All of these

To wavelength of light by his experiment , Newton utilized:

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Wavelength of light

Intensity of light

amplitude wave

None of above

Which one of the material is not polymer

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Glass

Natural rubber

Polyethene

Polystyrene

If a car at rest accelerates uniformly to a speed of 144 km/h in 20 s it covers a distance of

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20 m

400 m

1440 m

2880 m

By the pull of moon, the land up and down by as much as

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16 cm

25 cm

12 cm

10 cm

When the lift is falling freely under gravity, then

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T = W - mg

T - W = ma

T = 0

None of these

The electrons occupying the conduction band are known as

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conduction electrons

free electrons

both of them

none of them

The ultimate tensile strength is

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Greatest stress, a material can endure

Stress is increased beyond the yield strength

Maximum stress, a material can with stand

None of these

Ball pen functions on the principle of

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Viscosity

Boyle's law

Gravitational force

Surface tension

Ductility is the property of a substance in which a material undergoes the deformation as

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Elastic deformation

Plastic deformation

Shear deformation

None of these

A ray of light always points

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Anti parallel to wave front

Perpendicular to wave front

Parallel to wave lets

None

Mercury thermometer can be used to measure temperature up to

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260°C

100°C

360°C

450°C

When a gas is compressed:

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Its internal energy decreases

Its temperature decreases

Its temperature increases

None of these

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

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Plasticity

Elasticity

Still in elasticity

None of these

Which one the following gives three regions of electromagnetic sepctrum in order of increasing wavelength?

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Gamma rays, micro waves, visible light

Radio waves, ultraviolet waves, X-rays

Ultraviolet rays, Infrared rays, micro waves

Visible light, gamma rays, radio waves

A body of mass 1.0 kg is falling with an acceleration of 10 m/s² Its apparent weight will be (g = 10 m/s²)

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1.0 kg wt

2.0 kg wt

0.5 kg wt

Zero

Rain drops are spherical because of

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Gravitational force

Surface tension

Low viscosity of water

Air resistance

The smallest part of a crystal lattice is called:

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A molecule

An atom

A unit cell

A particle

A spectrum which contains all wavelengths without any break is called

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Emission spectrum

Line spectrum

Continuous emission spectrum

All of them

A gas at 250K is contained ion a closed vessel. If its temperature increases by 1K, the percentage increase in its pressure is

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0.4%

0.6%

0.8%

1.0%

The horizontal component of a projectile moving with initial velocity of 500 ms^-1at an angle 60° to x-axis is

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500 ms^-1

1000 ms^-1

250 ms^-1

zero

Turn table is the plateform over which we place

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Diffraction grating

Prism

Glass slab

a and b

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

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Smaller

Longer

Equal

None of these

The viscosity of water is

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0.019 x 10^-3 Nsm^-2

0.801 x 10^-3 N-sm^-2

6.29 x 10^-3 N-sm^-2

0.081 x 10³ N-sm^-2

The approximate efficiency of Nuclear reactor

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33%

32%

39%

45%

A force of 0.01 N is exerted on a charge 1.2 x 10^-5C at a certain point The electric field at that point is

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1.2 x 10⁴N/C

8.3 x 10²N/C

8.3 x 10^-2N/C

The systolic blood pressure comes when

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Vessel collapse

Cutting off the blood flow

None of these

All of these

The unit of coefficient of viscosity is

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kgm^-1s^-1

Nsm^-2

Poise

All of these

Charles Coulomb measured the force between two charges in

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1860 AD

1890 AD

1874 AD

1871 AD

When the fuel ignited it turns to a gas at

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Low pressure

High pressure

Extremely high pressure

None of these

When light passes through a tourmaline crystal, it becomes

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plane polarized

directly polarized

un-polarized

spherically polarized

Blood vessels are not

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Flexible

Rigid

Some times flexible

None of these

The ultimate tensile strength (UTS) can be regarded as the

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Maximum strength of the material

Nominal strength of the material

Minimum strength of the material

None of these

A fiber of 50μm diameter capable of carrying white light at ______ distances is called ______ index fiber

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Large, multi-mode step

Small, multi-mode step

Small, multi-mode graded

Large, single mode step

A proton and a α-particle enter into region of uniform electric field the ratio of force on proton to α-particle is

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4 : 1

1 : 4

2 : 1

1 : 2

The relation Cp > Cv by an amount equal to

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Gas constant

Universal gas constant

Both

None of these

Rate of change of momentum is called

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impulse

force

torque

momentum

A body starting from rest covers a distances of 0.45 km and acquires a velocity of 300 Kmh^-1its acceleration will be

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7.71 m s^-2

0.5 m s^-2

0.15 m s^-2

0.092 m s^-2

Diffraction pattern has also been observed for:

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Proton

Neutron

Hydrogen atom

All of them

The displacement-time graph of a particle is as shown below.It indicates that

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The particle starts with a certain velocity,but the motion is retarded and finally the particle stops

The velocity of the particle is constant throughout

The acceleration of the particle is constant throughout

The particle starts with a velocity the motion is accelerated and finally the particle moves with a constant velocity

Under the elastic region, the deformation produced in the material is

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permanent

temporary

either of them

none of them

The light source used in multimode step index fibre is

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A monochromatic source

Red light

White light

None of these

The dimensional formula for latent heat is:

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M^°L²T¹

ML²T^-2

MLT^-2

ML²T^-1

The substance, which exists in two or more crystal forms under different conditions is called:

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Isomorphism Substance

Allotropic substances

True substances

Polymorphous substances

A body will be in translational equilibrium, if

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A couple produces

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Purely linear motion

Purely rotational motion

Linear and rotational motion

No motion

The field of a long bar magnet is like a

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Two pole pieces of magnet

Solenoid

Toroid

None of these

How many wavelengths of Kr⁸⁶ are these in one metre?

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1553164.13

1650763.73

2348123.73

652189.63

The high blood pressure is known as

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Diastolic

Systolic

High blood pressure

None of these

The contrast in the fringes in any interference pattern depends on

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Frings width

Intensity ratio of the sources

Distance between the slits

Wavelength

Choose the correct statement

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Rays are normal to wave front

Rays may be normal to wave front

Rays are not normal to wave front

There is no relationship between rays and wave fronts

Moment of inertia depends on mass and also on

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r

r²

r³

None of these

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

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Red

Green

Yellow

Violet

Which of the following have maximum ionization power?

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𝛼 −rays

𝛽 −rays

𝛾 −rays

Same for all

The units of the temperature coefficient of resistant are

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ΩK^-1

K^-1

ΩK

(ΩK)^-1

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

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A telescope

Compound microscope

Simple microscope

None of these

Who gave the idea of light as wave ?

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Newton

Huygen

Thomos Young

Bragg

Uniform acceleration is defined as

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Average acceleration

Instantaneous acceleration

Equal change in velocity and time

None of these

A ball is thrown with a speed of 30 ms^-1in a direction 30° with the ground. What is its vertical height?

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115 m

1.15 m

11.5 m

0.115 m

Who confirm the wave theory of light ?

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Newton

Michelson

Newton

Thomos Young

When light signal travels along fibres, the power losses are mainly due to

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scattering

absorption

both of them

either of them

YDS experiment can be used to determine:

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Grating element

Fringe spacing

Wave length of monochromatic light

Frequency of wave light

The substances in which atoms cooperate with each other in such a way so as to exhibit a strong magnetic effect, are called

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

There are earth stations which transmit signals to satellites and receive signals via satellite from other countries are

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200

Over 200

400

500

Total mass when silver coins are added to box as 2.2 kg, 0.01001 Kg and 0.01002 Kg correct to appropriate precision

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2.3 Kg

2.2 Kg

2.43 Kg

2.67 Kg

If stress is increased beyond the elastic limit a permanent change in the material is observed This behavior is called

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Elastic deformation

Elasticity

Plasticity

Yield strength

There are two electric bulbs of 40 W and 100 W. They are first connected in series and then in parallel across a source:

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40W bulb will be brighter in series and 100W in parallel

100W bulb will be brighter in series and 40W in parallel

40W bulb will be brighter in both the cares

100W bulb will be brighter in both the cares

If the focal length of objective is 10 mm find its magnification

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18

19

20

21

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

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60%

70%

50%

40%

If the focal length of the eye piece 25.0 mm find its magnification

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12.0

14.0

- 11.0

- 13.0

Longitudinal strain can be produced in

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Glass

Water

Honey

Hydrogen gas

The light produced by a laser is all the following except

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Incoherent

Monochromatic

In the form of a narrow beam

Electromagnetic

A diesel engine converts heat energy into work by

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35%

40%

35% to 40%

45%

Uniform electric field can be mapped with electric field lines which are

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Parallel

Equally spaced

Parallel and equally spaced

None

When an electric field is strong the lines are

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Farther

Closer

Parallel

All of them

Approximate power of a car moving at a speed of 90 kmh^-1 in watts

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1.1 × 10⁵

1.2 × 10⁶

1.3 × 10⁷

1.4 × 10⁸

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 time constant is the time required to deposit the equilibrium charge

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63 times

36 times

0.63 times

0.36 times

The locus of all the points in the same phase of vibration is called:

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Wave packet

Wavefront

Wave number

None of these

Newton's laws are empirical laws, deduced from

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Theories

Experiments

Facts

None of these

Which one of the following waves cannot be polarized

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Radio waves

X-rays

Transverse waves in a string

Longitudinal waves in a gas

A body of mass 5 kg is moving in a circle of radius 1 m with an angular velocity of 2 rad/s.The centripetal force is

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10 N

20 N

30 N

40 N

Base quantities are

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Scalars

Vectors

Both

None of these

How large a force is required to accelerate a body of weight 5 N with 4 ms^-2 is

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10 N

5 N

2 N

1 N

A converging lens in used to from an image on a screen when the upper half of the lens is covered by an opaque screen

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Half the image will disappear

No change either in size or in intersity

Intensity of image will increase

Intensity of the image will decrease

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

Plane polarized light can be produced by:

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Simple reflection

Refraction

Selective absorption

All of these

The SI unit of torque is

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Nm^-1

Nm^-2

Ncm

Nm

When seen in green light the saffron and green portions of our National Flag will appear to be

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Black

Black and green respectively

Green

Green and yellow respectively

In launch mass of the rocket fuel is

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70%

80%

More than 80%

None of these

Relation between range and maximum range is

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R=R_max Sinθ

R=R_max Sinθ/2

R=R_max Sin2θ

R_max = RSin2θ

If P is the pressure of gas than K.E per unit volume of gas is

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P/2

P

3/2 P

2P

The approximate efficiency of silicon solar cell is

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5 - 10%

9 - 12%

12 - 16%

15 - 18%

Time of flight of a body in projectile is the time in which a body

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Remains in the air

It reaches maximum height

The velocity becomes zero

None of these

S,I unit of magnetic flux is

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Weber metre^-2

Weber

Weber per metre

Weber per metre⁴

In young's slit experiment on interference the ratio of the intensities of a bright band and a dark band is 6 : 1 the ratio of the amplitudes o the interfering waves is

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16

5/3

4

1/4

The magnitude of torque is equal to the product of the force and the moment arm. The moment arm is

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The distance between the point and the point of the action of the force

The maximum distance between the pint and the line of action of the force

The minimum distance between the pivot point and the line of action of the force

All of these

The valency of electron in the valence band is known as

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Atom

Molecule

Hole

None of these

The focal length of the lens of human eye

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Is fixed

Varies from zero to infinity

Can be increased only

Can be decreased only

In an adiabatic process

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Temperature remains constant

No change of internal energy

Volume remains constant

No heat enters or leaves the system

The relation for time of flight is

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Potential energy cannot be expressed in

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Joule

Nm

Ns

Watt hour

An object is placed at a distance of f/2 from a convex lens.The Image will be

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At one of the foci,virtual and double its size

At,3/f real and inverted

At 2f,virtual and erect

At f,real and inverted

The time of flight of a projectile motion equals to

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half of the time to reach maximum height

twice the time to reach maximum height

one fourth of time to reach maximum height

time to reach maximum height

Propagation of light in an optical fibre requires

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Total internal reflection

Continuous refraction

Both

None of these

Torque will be zero if

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body is at rest

rotating with uniform angular velocity

zero angular acceleration

all of them

Angular momentum is conserved under

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Central force

Constant force

Variable force

Uniform force

The Bernoulli's equation is based on the

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Law of conservation of energy

Law of conservation of mass

Law of conservation of momentum

None of these

If the water exists from the pipe at the rate 1.5 kgs^-1at speed of 0.3 ms^-1. If the water strikes a wall normally, find the force on the wall is

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5.53 N

5.03 N

1.35 N

0.45 N

In which of the optical fibres, the propagation of light signal is through continuous refraction?

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multi-mode step index fibre

multi-mode graded index fibre

both of them

none of them

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

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Simple cube

Face centered cube

Body centered cube

None of these

The atom or molecules in crystalline solids are held together by:

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Cohesive force

Adhesive force

Gravitational force

Magnetic forces

With rise in temperature the electric conductivity of intrinsic semiconductor

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Increases

Decreases

First increases and then decreases

First decreases and then increases

In an ideal gas, the molecules have:

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Kinetic energy only

Potential energy only

Both KE and PE

None of these

The product of force times the perpendicular distance between some point and the line of action of the force is

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The moment of inertia action on it

The moment of force about the chosen point

The angular momentum of the body

None of these

The direction of velocity is along the direction of

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Motion

Displacement

Velocity

None of these

The ratio of volumetric stress to volumetric strain is called

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Young's modules

Bulk modulus

Shear modulus

Hooke's law

The critical temperature of tin is

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1.18 K

4.2 K

3.72 K

7.2 K

A body of mass 5 kg, initially at rest is moved by a force of 2 N on smooth horizontal surface the work done by the force in 10 s is

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20 j

30 j

40 j

60 j

Electron volt is a unit of

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Potential difference

Energy

Charge

Power

The atoms molecules or ions in a crystalline solids are at room temperature

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Motionless

Vibrate violently

Fixed

Simply vibrate

In the study of interference and diffraction, we consider

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plane waves

plane wavefronts

both of them

none of them

Which of the following statements for an object in equilibrium not true?

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The object must be at rest

The object can be at rest

The object is moving at constant

The acceleration of the object is zero

The pattern of NaCI particles have a shape which is:

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Cubic

Body centred cubic

Simple cubic

Face centred

Both A and C

The dimensions of the coefficient of viscosity are

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[ML^-1T¹]

[MLT]

[M^-1L^-1T¹]

[M⁰L⁰T⁰]

When the torque acting on a system is zero, which of the following will be constant

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linear momentum

angular momentum

impulse

force

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

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T - W = ma

W - T = ma

T = W

None of these

When R^x is negative and R^y is positive, the resultant lies in the second quadrant and its direction is

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θ = 90 + Φ

θ = 180 - Φ

θ = 180 + Φ

None of these

Motion of a paratrooper is an example of

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motion

rest

static equilibrium

dynamic equilibrium

A long solenoid has 20 turns/ cm. The current necessary to produce a magnetic field of 20 mellites inside the solenoid is approximately:

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1A

2A

4A

8A

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

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Center of the body

Center of mass

Center of gravity

Both B and C

When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates

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Decreases

Increases

No change

May increase or decrease

The magnitude of work is zero when the angle between force and displacement is

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0^o

90^o

10^o

None of these

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

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591 ms^-1

461 ms^-1

396 ms^-1

372 ms^-1

The valence energy band may be either

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Completely filled

Partially filled

a and b

All of them

Diamagnetic substances are those in which

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Spin and orbital motions are supported

Spin and orbital motions are opposed

Resultant of spin and orbital motion is zero

None of these

Examples of an adiabatic process is

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Burst of tyre

Cloud formation in the atmosphere

Rapid expansion and compression of air in sound waves

All of these

A progressive sound wave is a means of transferring energy. A progressive sound waveof constant frequency is generated in air. The intensity of energy transfer is directlyproportional to another of the wave parameters. Which of the following is correct?

Choose an answer

Intensity 𝖺 (𝑎𝑚𝑝𝑙𝑖𝑡𝑢𝑑𝑒)²

Intensity 𝖺 (𝑝𝑒𝑟𝑖𝑜𝑑𝑖𝑐 𝑡𝑖𝑚𝑒)²

Intensity 𝖺 (𝑠𝑝𝑒𝑒𝑑)²

Intensity 𝖺 (𝑤𝑎𝑣𝑒𝑙𝑒𝑛𝑔𝑡ℎ)²

A substance which have empty conduction band is called

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Conductor

Insulator

Semiconductor

None of these

Which of the following is an optically active material

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Solution of cane sugar

Liquid nitrogen

Mercury

Polaroid

The terminal velocity of a small size spherical body of radius R moving in a fluid varies as

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R

R²

1/R

(1/R)²

Such substances which break soon after they cross elastic limit is called

Choose an answer

Weak substance

Ductile substance

Brittle substance

Organic substance

For average velocity of a body, it has

Choose an answer

Straight path

Curved path

Steady motion or variable

All of them

The time rate of change of displacement is called

Choose an answer

Speed

Velocity

Acceleration

None of these

Substance which break just after the elastic limit is crossed are called

Choose an answer

Soft subtances

Hard substances

Brittle substances

Ductile substances

The magnification is negative for

Choose an answer

Real image

Virtual image

Sometimes for real sometimes for real

Only for cancave lens

Optical device used in spectrometer

Choose an answer

Simple microscope

Compound microscope

Telescope

Any of them

The electrons, which can wander in the solid, are known as:

Choose an answer

Valence electron

Free electron

Loosely bound electrons

None of these

In metallic crystals which of the following thing remains constant?

Choose an answer

amplitude of oscillations

temperature of solid

average atomic positions

all of them

Thick tar and honey have

Choose an answer

Small coefficient of viscosities

Large coefficient of viscosities

Zero coefficient of viscosities

Moderate coefficient of viscosities

Choose an answer

1750 Nm^-2

1980 Nm^-2

1975 Nm^-2

1999 Nm^-2

The burnt gas expelled from the rocket engine with

Choose an answer

High velocity

Extremely high velocity

Very high velocity

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

The typical example/examples of optically active crystals

Choose an answer

Quartz

Crystals of sodium chlorate

Crystals of sodium chloride

a and b

The time rate of change of displacement is called

Choose an answer

Speed

Velocity

Acceleration

None of these

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 vertical velocity component changes with

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Distance

Time

Height

Angle

Elastic deformation of a material is the deformation which is

Choose an answer

Permanent

Temporary

Some what permanent

None of these

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

A line normal to the wavefront including the direction of motion is called

Choose an answer

perpendicular line

parallel line

a ray of light

none of them

Crystal lattice is a repetition of

Choose an answer

Atoms

Molecules

Unit cell

All of them

On heating, glass gradually softens into a paste-like state before it becomes a very viscous liquid at almost

Choose an answer

600°C

7600°C

800°C

900°C

If we move from equator to pole,value of g

Choose an answer

Increases

Decreases

Remains same

First (A) and then (B)

Change in momentum per second is:

Choose an answer

Product force and time

Product of pressure and area

Ratio of pressure and area

None of these

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 oil surface floating on water surface exhibits beautiful colour patter, which is due to

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Reflection of light

Diffraction of light

Interference of light

None of these

Why the toner is given a negative charge to the drum

Choose an answer

To spread over the drum

To stick the writing

To neutralize writing

None of these

The projectile motion is composed of

Choose an answer

horizontal motion only

vertical motion only

horizontal and vertical motion

none of them

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 a photocell, sodium and potassium emit electrons for:

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Visible light

Infrared light

Ultraviolet light

All of these

A double convex lens acts as a diverging lens when the object is

Choose an answer

Between f and 2f

At the foucs

Inside the focus

All of these

An ordinary glass gradually softens into a paste-like state before it becomes a very viscous liquid. It happens almost at:

Choose an answer

800°C

500°C

300°C

100°C

None of these

The study of nature has been classified into branches are:

Choose an answer

Two

Three

Four

None of these

The speed of commercial jet (air liner) is

Choose an answer

200 ms^-1

267 ms^-1

327 ms^-1

335 ms^-1

At high speeds the force is no longer

Choose an answer

Proportional

Simply proportional

No proportion

None of these

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

Choose an answer

non-homogeneous medium

homogeneous medium

both of them

empty medium

The ballistic missiles are useful for

Choose an answer

Short ranges

Long ranges

Medium ranges

None of these

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

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Their range will be same

Their maximum height will be same

Their landing velocity will be same

their time of flight will be same

In order to observe interference , the interfering beams must be

Choose an answer

monochromatic

coherent

either of them

both of them

The moment of inertia of a body does not depend upon its

Choose an answer

Angular velocity

Mass

Distribution of mass

Axis of rotation

If the water exists from the pipe at the rate 1.5 kgs^-1 at speed of 0.3 ms^-1. If the water strikes a wall normally, find the force on the wall is

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5.53 N

5.03 N

1.35 N

0.45 N

A polarizer is used to

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Reduced intensity of light

Produce polarized light

Increase intensity of light

Produce unpolarised light

A thin film is a transparent medium whose thickness with the wavelength of light are

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Not comparable

Comparable

Both

None of these

In light waves, the components of electric and magnetic fields are

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parallel to each other

anti-parallel to each

right angle to each other

none of them

Magnetic field inside a solenoid is:

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) Directly proportional to current

Inversely proportional to current

Directly proportional to its length

Inversely proportional to total no of turns

Of the following quantities,which one has dimensions different from the remaining three

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Energy per unit volume

Force per unit area

Product of voltage and charge per unit volume

Angular momentum

Point out angle/angle at which the sin θ and tan θ have the same value

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2^o and 8^o

4^o and 6^o

2^o and 4^o

8^o and 10^o

When sunlight falls on a soap bubble (film), it appears coloured because of

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interference of light

dispersion of light

polarization of light

diffraction of light

In case when there is not total displacement and average velocity, then the motion is described by

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Variable velocity

Instantaneous velocity

Initial velocity

None of these

The unit vectors is not restricted to Cartesian coordinate system only. Unit vectors may have

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Specific direction

Any direction

Not a and b

None of these

A 2 kg body and a 3 kg body have equal momentum.If the kinetic energy of 3 kg body is 10 j,the KE of 2 kg body will be

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6.66 j

15 j

22.5 j

45 j

The SI unit of power is terms of base unit is

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Watt

Kgm²s^-3

Kgm^-2s^-3

Kgm²s³

A man sitting in a bus traveling in a direction from west to east with a speed of 40 km/h observes that the rain-drops are falling vertically down.To the another man standing on ground the rain will appear

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To fall vertically down

To fall at an angle going from west east

To fall at an angle going from east to west

The information given is insufficient to decide the direction of rain

Truth of kinetic energy theory is confirmed by:

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Diffusion of gases

Brownian motion

Both A and B

None of these

The dark areas retain their

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negative charges

positive charges

both positive and negative charge

none of these

Which one of the following gas properties of gas molecules is the same at a particular temperature

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Momentum

Speed

Mass

Kinetic Energy

For glass-air boundary the critical angle θ_c is

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30^o

41.8^o

42.0^o

44.0^o

Which of the following pair of quantities do not have the same units?

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Stress, Young's modulus

Strain, bulk modulus

Stress, bulk modulus

None of them