Question # 1

The SI units of momentum is

Choose an answer

Kg m s^-2

Kg ms

Kg m s²

Ns

How are X-rays diffracted by crystals in X-rays crystallography?

Choose an answer

they bounce off the nucleus

they are diffracted whey they pass from between them acting as a slit

they are diffracted by the electron clouds in the atoms

they hit the side the nucleus and change direction and thus are diffracted

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

Choose an answer

Straight line

Curved path

Zig Zag path

None of these

Two forces are acting together on an object.The magnitude of their resultant is minimum when the angle between the force is:

Choose an answer

0°

60°

120°

180°

If the distance of separation between two chares is increased,the electrical potential energy of the system will

Choose an answer

Increase

Decrease

May increase or decrease

Remain the same

Propagation of light in an optical fibre requires that the light should

Choose an answer

be partially confined within the fibre

be totally confined within the fibre

not be confined within the table

none of them

The SI unit of power is terms of base unit is

Choose an answer

Watt

Kgm²s^-3

Kgm^-2s^-3

Kgm²s³

Two masses m₁ and m₂ have equal momentum their kinetic energies are in ratio of

Choose an answer

m₂: m₁

m²1 : m₂²

m₁: m₂

m₂^{2 :}m²1

A particle of mass m has momentum x.Its kinetic energy will be

Choose an answer

mx

mx²

x²/m

x²/2m

The valence energy band may be either

Choose an answer

Completely filled

Partially filled

a and b

All of them

Microwaves are used because they travel in a

Choose an answer

Narrow beam

Straight line

Easily pass through Earth atmosphere

All of these

In an adiabatic process

Choose an answer

Temperature remains constant

No change of internal energy

Volume remains constant

No heat enters or leaves the system

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

Choose an answer

4 atmosphere

0.75 atmosphere

8 atmosphere

0.25 atmosphere

Blood has a density

Choose an answer

Equal to water

Greater then water

Lesser then water

None of these

Single mode step index fibre has

Choose an answer

Thick core and large cladding

Thick core and shorter cladding

Thin core and shorter cladding

Thin core and larger cladding

Speed of efflux increases if

Choose an answer

Distance of hole from surface of water increases

Distance of hole from bottom decreases

Independent of distance of hole from surface

Both a and b

The field of a long bar magnet is like a

Choose an answer

Two pole pieces of magnet

Solenoid

Toroid

None of these

Young's modulus for ice is

Choose an answer

3

14

20

32

Iron, cobalt and nickle are examples of

Choose an answer

diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

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

Choose an answer

Heat

Temperature

Hotness

Coldness

The subtances which break just after the elastic limit is reached are known as:

Choose an answer

Ductile

Brittle

Malleable

Hard

Soft

The magnetic field of a solenoid is quite similar to that of a:

Choose an answer

Straight conductor

A horse shoe magne

Any magnet

A bar magnet

Motion of a paratrooper is an example of

Choose an answer

motion

rest

static equilibrium

dynamic equilibrium

The more general form of second law of motion is

Choose an answer

F = ma

F x t = mV_f- mV_i

Both

None of these

In place of spark plug, the diesel engine requires also

Choose an answer

High speed air

High temperature air

Low temperature air

None of these

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

Choose an answer

Wave packet

Wavefront

Wave number

None of these

The diffraction grating is used to measure

Choose an answer

wavelength of light

focal length of a lens

refractive index of prism

polarization of light

The relation Cp > Cv by an amount equal to

Choose an answer

Gas constant

Universal gas constant

Both

None of these

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

A fly wheel of moment of inertia 500 kgm²is rotating at angular speed of 6 rad/s. What torque is needed to stop wheel in 3s

Choose an answer

500 Nm

1000 Nm

1500 Nm

2000 Nm

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

Potential energy cannot be expressed in

Choose an answer

Joule

Nm

Ns

Watt hour

Find the change in internal energy when heat transferred to the system is 42 J

Choose an answer

15 J

10 J

5 J

2.5 J

The moment of momentum is called

Choose an answer

Couple

Torque

Angular momentum

Force

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 YDS experiment, data given isλ=500 nm, d=1 mm, L=100cm,∆y come out to be:

Choose an answer

0.5 cm

0.5 mm

0.5 nm

0.5 m

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

Choose an answer

Parallel

Equally spaced

Parallel and equally spaced

None

Light appears to travel in straight line because

Choose an answer

It is not absorbed by the atmosphere

It is refracted by the atmosphere

Its wavelength is very small

Its velocity is very large

If a ball comes back to its starting point after bouncing off the wall several times, then its

Choose an answer

total displacement is zero

average displacement is zero

none of them

both of them

When monochromatic light is incident, making certain angle, on a thin parallel film, the interference fringes formed are

Choose an answer

straight

circular

square

plane

In a uniform circular motion

Choose an answer

Velocity and acceleration remain constant

Kinetic energy remain constant

Speed and acceleration change

Only velocity change acceleration remain constant

In full wave rectification by bridge the number of diodes required are

Choose an answer

3

4

2

5

The magnitude of the displacement is a line from initial position to final position which is

Choose an answer

straight

curved

either straight or curved

none of them

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

Choose an answer

360000

72000

36000

129600

Wave front is the locus or all points in vibration are in the same

Choose an answer

Frequency

Phase

Wavelength

All of these

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

Choose an answer

Positive

Negative

Zero

None of these

Carnot engine is ____________ heat engine.

Choose an answer

A reversible

An irreversible

An ideal

Both A and C

Single mode step index fibre is used to send

Choose an answer

white light

green light

a strong monochromatic light

yellow light

Choose an answer

1750 Nm^-2

1980 Nm^-2

1975 Nm^-2

1999 Nm^-2

The interference fringes are of

Choose an answer

equal width

variable width

zero width

non-uniform width

The centripetal force for a car moving on a road is given by

Choose an answer

Friction due to tyres

Force of brakes

The driver of the car

Force by steering wheel

The S.I. unit of an electric flux is

Choose an answer

NmC^-1

NmC^-2

Nm² C^-1

Nm² C^-2

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 thermodynamics scale of temperature starts from

Choose an answer

273 K

zero

273.16 K

None of these

When the terminal velocity is reached the acceleration of a body moving through a viscous medium is

Choose an answer

Zero

Positive

Negative

Depends upon other factor

In order to get interference using two light rays:

Choose an answer

The sources should be monochromatic and coherent

The sources should have the same frequency

Superposition should be linear

All of these

Layer of oil on water in sunlight appears coloured due to

Choose an answer

diffraction of light

dispersion

interference of light

polarization of light

The percentage errors in the measurements of mass and speed are 2% and 3% respectively.How much will be the maximum error in the estimate of the kinetic energy obtained by measuring mass and speed.

Choose an answer

11%

8%

5%

1%

If d = 0.25 cm Y = 0.059 cm L = 100 cm m = 2 then λ is equal to

Choose an answer

567 nm

569 nm

590 nm

596 nm

Blood is an incompressible fluid having density nearly equal to

Choose an answer

Milk

Honey

Water

None of these

The wave length of x-rays is of the order of

Choose an answer

10^-17 m

10^-4 cm

10^-9 m

10^-10 m

The dimensional formula for latent heat is:

Choose an answer

M^°L²T¹

ML²T^-2

MLT^-2

ML²T^-1

Diamagnetic substances are those in which

Choose an answer

Spin and orbital motions are supported

Spin and orbital motions are opposed

Resultant of spin and orbital motion is zero

None of these

2π radian is equal to the degrees

Choose an answer

180^o

90^o

360^o

None of these

Crystalline solid do not show

Choose an answer

Sharp melting points

Flat faces

Long range order

Isotropic expansion coefficients

Capacitor is a device use to store the

Choose an answer

A.C. current

D.C. current

Charge

Voltage

The study of nature has been classified into branches are:

Choose an answer

Two

Three

Four

None of these

The reciprocal of bulk modulus is called:

Choose an answer

Shear modulus

Elasticity

Young's modulus

Compressibility

As the droplet accelerates the net force acing on it is

Choose an answer

Increase

Decreases

Zero

None of these

The SI unit of stress is same as that of

Choose an answer

Momentum

Pressure

Force

Length

Newton's rings are formed as a result of

Choose an answer

diffraction of light

dispersion of light

interference of light

polarization of light

Absolute zero is considered as that temperature at which:

Choose an answer

All liquids become gases

All gases become liquids

Water freezes

None of these

In cause of YDS experiment, the distance between adjacent bright fringes is given by

Choose an answer

Δy =λL/d

ΔY = L/λd

ΔY =λ/L

None of these

Optical fibres function on the principle of

Choose an answer

reflection

refraction

total internal reflection

total internal refraction

The velocity of light in vacuum can be changed by changing

Choose an answer

Frequency

Amplitude

Wavelength

None of these

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

Choose an answer

0.12V

6.0V

2.0V

24V

The force between two chares 0.06 m apart is 5N.If each charge is moved towards the other by 0.01 m,then the force between them will become

Choose an answer

7.20 N

11.25 N

22.50 N

45.00

Torque is a

Choose an answer

Scalar quantity

Vector quantity

Physical quantity

None of these

The horizontal range of projectile, at a certain place, depends upon

Choose an answer

the mass of the projectile

velocity of projection

angle of projection

angel as well as velocity of projection

In integers such as 8,000 Kg, significant zeros are determined by the instrument when least count is 1 Kg

Choose an answer

8.00 × 10³ Kg

8.000 × 10³ Kg

8.00 × 10³ Kg

8.0 × 10³ Kg

polymeric solids have

Choose an answer

low specific gravity

high specific gravity

either of them

none of them

A projectile is thrown at an angle of 30° with horizontal with a velocity of 980 m sec^-1. The time of flight to reach the highest point of its trajectory is:

Choose an answer

50 sec

100 sec

150 sec

250 sec

You are traveling in a car during a thunder storm. In order to protect yourself from lightning you would prefer to

Choose an answer

Remain in car

Take shelter under tree

Get on and lie flat on the ground

Touch the nearest electric pole

The typical example/examples of optically active crystals

Choose an answer

Quartz

Crystals of sodium chlorate

Crystals of sodium chloride

a and b

Ferromagnetic materials are those in which atoms cooperate with each other

Choose an answer

Weakly

Strongly

Moderately

None of these

Moment of inertia depends on mass and also on

Choose an answer

r

r²

r³

None of these

If a wire is stretched to double of its length then the strain will be

Choose an answer

1

0.5

2

0

A particle is moving with a constant speed along a straight line path A force is not required to

Choose an answer

Increase its speed

Decrease its momentum

Change its direction

Keep it moving with the same speed

In projectile motion the vertical acceleration is

Choose an answer

Zero

Maximum

'g'

None of these

The pressure will be low where the speed of the fluid is

Choose an answer

Zero

High

Low

Constant

When a silicon crystal is doped with trivalent impurity which are

Choose an answer

Indium

Arsenic

Phosphorous

None of these

When the fluid is incompressible, for which the density is

Choose an answer

Constant

Change

Both

None of these

The dimensional formula of angular velocity is:

Choose an answer

M^°L^°T^-1

MLT^-1

M^°L^°T^-1

Under a constant torque,the angular momentum of a body changes from A to 4A second find the torque.

Choose an answer

(3/4)A

(1/4)A

3A

(4/3)A

Glare produces when light reflects from water snow and rough road surfaces when their angle of incidence is

Choose an answer

Small

Large

Very large

None of these

If the volume of a gas is to be increased four times then

Choose an answer

Its temperature must be doubled

At constant temperature its pressure must be decreased four times

At constant temperature its pressure must be increased two times

It cannot be increased

The terminal velocity of falling object will be proportional to

Choose an answer

r²

1/r²

r

1/r

A solid subjected to deformation along one dimension

Choose an answer

Only have tensile stress

Only have compressive stress

Have both tensile and compressive stress

None of them

Light waves are

Choose an answer

Transverse waves

Longitudinal waves

Compressional wave

None of these

If a raindrop with a mass of 0.05 g falls with constant velocity the retarding force of atmospheric firction is neglect density of air

Choose an answer

Zero

49 dynes

490 N

49 N

The value of young's modulus is maximum for:

Choose an answer

Dimond

Copper

Ice

Mercury

Water

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

Choose an answer

Acceleration

Velocity

Distance

None of these

Solid angle is

Choose an answer

Two dimensional angle

Three dimensional angle

One dimensional angle

Multi-dimensional angle

The atoms or molecules in a crystalline solid are held together by

Choose an answer

Attractive force

Gravitational force

Cohesive force

Electromagnetic force

A Carnot engine works between 600K and 300. If heat input is 100J then the output is

Choose an answer

300 J

400 J

50 J

56 J

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

Choose an answer

different

equal

zero

variable

Rate of change of momentum is called

Choose an answer

impulse

force

torque

momentum

The force applied on unit area to produce any change in the shape, volume or length of a body is known as

Choose an answer

strain

elasticity

stretching

stress

For an elliptic orbit, the satellite has speed of

Choose an answer

30,0000 kmh^-1

35,000 kmh^-1

37,000 kmh^-1

None of these

Collision between gas molecules are perfectly elastic when collide with

Choose an answer

Walls of container

Themselves

Both

None of these

In a closed organ pipe, the fundamental frequency is f. What will be the ratio of thefrequencies of the next three overtones?

Choose an answer

2 : 3 : 4

3 : 7 : 11

3 : 4 : 5

3 : 5 : 7

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

Choose an answer

Simple cube

Face centered cube

Body centered cube

None of these

Which of the following is conservative field

Choose an answer

Electrostatic field

Frictional field

Viscous field

All of these

The direction of the linear momentum is the direction of

Choose an answer

speed

velocity

weight

none of them

Vector subtractions is made when vectors are just

Choose an answer

Added

First make it negative then add

Only make it negative

None of these

The molecules or ions in a crystalline solid are

Choose an answer

static

not static

randomly moving

all of them

A thief stole a box with valuable article of weight W and jumped down a wall of height h.Before he reached ground he experienced a load of

Choose an answer

2W

W

W/2

Zero

A body weights 100 N on the surface of the earth. Its weight at a depth equal to half the radius of the earth is

Choose an answer

44.44 N

50 N

25 N

75 N

In a semi-conductor material, current flows due to

Choose an answer

positive charge

negative charge

both of them

none of them

The results of mechanical tests are usually expressed in terms of

Choose an answer

stress

strain

stress and strain

neither stress nor strain

The principle of rocket motion is based on the

Choose an answer

First law of motion

Second law of motion

Third law of motion

None of these

The charged nucleus of an atom itself spins its magnetic field is

Choose an answer

Equal to the field produced by orbital electrons

Greater than the field produced by orbital electrons

Much weaker than the field produced by orbital electrons

Very strong

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

In torque when the force is kept constant and the moment arm increases, then the torque

Choose an answer

Increases

Decreases

Remains constant

None of these

For a freely falling elevator everything in it

Choose an answer

Will have maximum weight

Will have minimum weight

Will be weightless

None of these

Numerical value of magnitude of a physical quantity is

Choose an answer

Independent of system of units

Directly proportional to magnitude of the unit

Inversely proportional to magnitude of the unit

Either (B) or (C)

Nm^-2is approximately called:

Choose an answer

Telsa

Weber

Pascal

Watt

Guass

When R_x and R_y are negative, the resultant lies in the third quadrant and its direction is

Choose an answer

θ = 180 + Φ

θ = 180 - Φ

θ = 90 + Φ

None of these

The original source of Wind energy is

Choose an answer

Tides

Waves

Sun

Moon

The dimension of elastic modulus

Choose an answer

ML^-1T²

MLT²

ML^-1T²

MLT³

The viscosity of red blood cells increase than water is from

Choose an answer

2 to 3 times

3 to 4 time

4 to 5 times

3 to 5 times

The couple arm is

Choose an answer

The smallest distance between two equal and anti parallel forces

The greatest distance between two equal and anti parallel forces

The lines of action of two equal and opposite forces

None of these

The concept of entropy was introduced in the thermodynamics by

Choose an answer

kelvin

Clausius

Carnot

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

The path difference and phase difference are related to each other as

Choose an answer

Phase difference = (2π) x path difference

Phase difference = (2π/λ) x path difference

Phase difference = (λ/2) x path difference

Phase difference = (2λ/π) x path difference

The engine of a car produces acceleration of 4 m/s²in the car.If this car pulls another car same mass,what will be the acceleration produces in m/s²

Choose an answer

2

8

4

12

Power loss taken place when a light signal travels along fibres by

Choose an answer

Multiple reflection

Light absorbed due to impurities in glass

At joint some light is scattered by group of atoms

All of these

Bernoulli s equation applicable in the case of

Choose an answer

Streamlined flow of compressible fluids

Streamlined flow of incompressible fluids

Turbulent flow of compressible fluids

Two vectors have unequal magnitudes can their sum be zero ?

Choose an answer

Yes

No

Can be zero

None of these

A person standing on a rotating platform has his hands lowered.He suddenly outstretches his arms.The angular momentum

Choose an answer

Becomes zero

Increases

Decreases

Remains the same

The energy of molecular motion appears in the form of

Choose an answer

Friction

Heat

Viscosity

Potential energy

The lowlying Earth satellites have acceleration

Choose an answer

9.7 ms^-2

9.9 ms^-2

10.0 ms^-2

9.8 ms^-2

What will be the colour of the sky as seen from the earth if there were no atmosphere ?

Choose an answer

Black

Blue

Orange

Red

Dimension of momentum is

Choose an answer

ML^-1T

M^-1LT

MLT

MLT^-1

The total linear momentum of an isolated system remains

Choose an answer

Constant

Variable

Zero

None of these

The acceleration of a body at some particular instant is called

Choose an answer

Initial acceleration

Variable acceleration

Instantaneous acceleration

None of these

A 120 m long train is moving in a direction with speed 20 m/s.A train B moving with 30 m/s in the opposite direction and 130 m long crosses the first train in a time

Choose an answer

6 s

36 s

38 s

None of these

A body moving in a circular path with constant speed has

Choose an answer

Constant acceleration

Constant retardation

Variable acceleration

Variable speed and constant velocity

The time of 30 vibrations of simple pendulum by stop water accurate upto one tenth of a second is 54.6 sec.

Choose an answer

1.82 ± 0.003 sec

2.82 ± 0.03 sec

2.82 ± 0.003 sec

None of these

When a stress changes the volume, it is called the

Choose an answer

compressional stress

tensile stress

shear stress

any one of them

Work done is a gravitational field along a closed loop is

Choose an answer

Maximum

Minimum

1

Zero

An un-power and un-guided missile is called a

Choose an answer

rocket

ballistic missile

guided missile

none of them

The magnitude of displacement is

Choose an answer

Distance between two points

Distance in a curved path

Shortest distance between two points

None of these

Choose an answer

A

B

C

D

When the source of light is at very large distance, the shape of wavefront is:

Choose an answer

Spherical

Cylindrical

Plane

None of these

Find the range of the projectile, having speed 30 ms^-1in a direction 30° above the horizon

Choose an answer

50 m

80 m

90 m

100 m

The study of properties of fluid at rest is called

Choose an answer

Fluid dynamic

Fluid statics

Both a and b

dynamics

The approximate efficiency of fossil fuel power plants is

Choose an answer

20 - 27%

30 - 40%

40 - 50 %

40 - 42%

Elastic deformation of a material is the deformation which is

Choose an answer

Permanent

Temporary

Some what permanent

None of these

When a stress changes length, it is called the

Choose an answer

compressional stress

tensile stress

shear stress

any one of them

In the equation PV^γ= constant, the valueγof is unity then the process is

Choose an answer

Isothermal

Adiabatic

Isobaric

Irreversible

A fly is sitting on the objective of a telescope pointed towards the moon.What effect is expected on the photography of the moon taken through the telescope?

Choose an answer

The entire field of view blocked

There is an image of the fly on the photography

There is no effect at all

There is a reduction in the intensity of the image

A body of mass M kg is lifted by a man to a height of one metre in 30 s. Another man lifts the same mass to the same height in 60 s.The work done by them is in ratio

Choose an answer

1 : 2

1 : 1

2 : 1

4 : 1

Young's modulus for steel is

Choose an answer

100

200

300

400

The torque is taken as positive when it is

Choose an answer

Clockwise

Anticlockwise

Both

None of these

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

Choose an answer

Reflection of light

Diffraction of light

Interference of light

None of these

The magnetic field due to the electric current in a conducting wire is:

Choose an answer

Towards the centre of the conducting wire

Circular around the conducting wire

In the direction of the electric current

In the direction opposite to the electric current

Which type of optical fiber has the largest diameter

Choose an answer

Single mode step index fiber

Multi-mode step index fiber

Multi-mode graded index fiber

None of these

Conductors are those materials in which the free electrons

Choose an answer

Very large

Very small

Plenty of

None of these

Computer chips are made from

Choose an answer

Conductors

Semiconductors

Insulators

Both A and B

The internal energy is similar to the

Choose an answer

Gravitational potential energy

Kinetic energy

Mechanical energy

None of these

In a photocell, certain metal emits electrons for :

Choose an answer

Visible light

Infrared light

Ultraviolet light

All of these

For assessment if total uncertainly in case of division

Choose an answer

Absolute uncertainly are added

Absolute uncertainty are subtracted

Percentage uncertainties are added

Percentage uncertainties are substracted

The communication with any place on the surface of the Earth can be made by the wave/rays known as

Choose an answer

Infrared

Microwave

X-rays

Radio waves

A non-conducting semiconductor diode is:

Choose an answer

Forward biased

Poorly biased

Reverse biased

None of them

Which of the following is the smallest unit?

Choose an answer

Millimeter

Angstrom

Fermi

Metre

Electromagnetic waves emitted by hot bodies are called:

Choose an answer

Photoelectrons

Alpha rats

Thermal radiation

None of these

The low blood pressure is

Choose an answer

70 - 80 torr

75 - 80 torr

78 - 809 torr

79 - 80 torr

The projectile is the motion which is

Choose an answer

One dimensional

Two dimensional

Three dimensional

None of these

The technological uses of superconductors are

Choose an answer

MRI

Magnetic levitation trains

Faster computer chips

All of them

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

Above a certain velocity the fluid flow, the motion of the fluid becomes

Choose an answer

Steady

Unsteady

Irregular

b and c

The light form Sun reaches earth in the form of

Choose an answer

plane wavefront

circular wavefront

spherical wavefront

elliptical wavefront

A 10 kg car is turning around a corner at 10 ms^-1. The radius of the circular arc is 10 m. Find the force between the types and pavement which is

Choose an answer

1.0 × 10⁶ N

1.0 × 10⁴ N

1.0 × 10² N

None of these

In addition and subtraction

Choose an answer

Percentage uncertainties are added

Percentage uncertainties are subtracted

Absolute uncertainties are added

Absolute uncertainties are subtracted

In carnot cycle, there are adiabats

Choose an answer

One

Two

Three

Four

Volume of metal cylinder with the help of a vernier callipers of least count 0.01 cm when diameter is 1.22 cm and length 5.35 cm. Find its uncertainty as

Choose an answer

6.02 ± 0.1 cm³

6.2 ± 0.1 cm³

6.25 ± 0.1 cm²

6.3 ± 0.1 cm³

Approximate power of an electric heater in watts

Choose an answer

2 × 10⁸

2 × 10⁵

2 × 10³

2.1 × 10⁴

N-kg^-1is the unit of

Choose an answer

Velocity

Force

Acceleration

None of these

The acceleration of the rocket is

Choose an answer

The charges are attracted when

Choose an answer

Two charges are alike

Two charges are opposite

All of them

None of these

The relation between Cp and Cv is given by

Choose an answer

Cp = Cv

Cp < Cv

Cp > Cv

None of these

The rate at a which the angular displacement is changing with time is called

Choose an answer

Angular acceleration

Angular velocity

Average angular velocity

None of these

Velocity is a

Choose an answer

Scalar quantity

vector quantity

constant quantity

none of them

A charge is placed at the centre of cube,the flux emitted through its one face is

Choose an answer

q/ε_∘

q/2ε_∘

q/6ε_∘

q/12ε_∘

To observe interference of light the condition which must be met with is that the sources must be:

Choose an answer

Monochromatic

Phase coherent

Both of above

None of above

Maximum number of orders available with a grating is ______ grating element

Choose an answer

Independent of

Directly proportional to

Inversely proportional to

Equal to

The original source of fossil fuels is

Choose an answer

Geothermal

Biomass

Sun

None of these

An optical fiber of ______ cm in diameter id equivalent to 7.62 cm diameter bundle of ______ wires to carry the same amount of signals

Choose an answer

0.6, aluminum

6.0, copper

0.6, copper

6.0, aluminum

Wb/m² is equal to

Choose an answer

Henry

Watt

Tesla

Dynes

The SI units of flow rate are

Choose an answer

m²s^-1

m³s^-2

m³s^-1

m²s^-2