Question # 1

The Bernoulli's equation often expressed in

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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 car moves with constant acceleration, the velocity time graph is a

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Straight line

Straight line rises equally

Horizontal straight line

None of these

When the velocity of the car is constant. The velocity time graph is a

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Straight line

straight line rises the same height for equal intervals of time

Horizontal straight line

None of these

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

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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

Significant figure in 0.00110

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One

Two

Three

Four

When temperature increases, viscosity of liquids

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Remains constant

Increases

Decreases

Becomes double

Beta particles have less ionizing power than that of alpha particles because:

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Their smaller energy

Their smaller mass

Their smaller density

Their smaller charge

As the droplet accelerates, the upward drag force on it

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Increases

Decreases

Suspended

None of these

A single step index fibre can carry more than

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14 TV channels

14,000 phone calls

16 TV channels

a and b

A 4 m long string fixed at its ends resonate in 4 segments. The wavelength of the waveis:

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4m

0.5m

2m

0.25 m

How many ways vector can be represented

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Bold letter

Arrow over capital letter

Graphically

All ow them

The equations for uniformly accelerated motion can also be applied to free fall motion of the objects by putting

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V_f= 0

Simple 'a'

a by g

None of these

Two water pipes of diameters 4 cm and 8 cm are connected with a supply line.The velocity of flow of water in the pipe 4 cm diameter is

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1/4 times

4 times

Twice

1/2 of 8 cm diameter pipe

Multimode step index fibre has diameter as

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40 μm

50 μm

60 μm

None of these

The frame of reference in which Newton's first law of motion holds is known as

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Inertial frame of reference

Non-inertial frame of reference

Every frame of reference

None of these

The value of Boltzman constant is

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1.28 x 10^-22JK^-1

1.38 x 10^-23JK^-1

1.38 x 10^-28JK^-1

1.35 x 10^-29JK^-1

A diffraction grating contains 5000 lines per centimeter, its grating element will be

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1 x 10^-4nm

1 x 10^-14m

1 x 10^-14cm

1 x 10^-4cm

The synchronous satellites are very useful for

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Worldwide communicatioin

Weather observations

Navigation

All of these

An electron and proton are placed a distance r apart in air the ratio of the electro static force to gravitational force between them is of the order of

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10³⁷

10³⁸

10³⁹

10⁴⁰

The energy that flows from a high temperature object to a low temperature object is called

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Heat

Sound

Electricity

Solar energy

The unit of power of a lens is

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Meter

Watt

Horsepower

Dioptre

If the tensile force is suddenly removed from a wire then its temperature will

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Decrease

Increase

Becomes zero

Remain constant

The dimensional formula for the modulus of elasticity is same as that for:

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Stress

Strain

Velocity

Surface tension

1^st superconductor was discovered in year

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1890

1930

1895

1911

A hollow metal sphere of radius 5 cm is change such that the potential on its surface 10 V. the potential at the centre of the sphere is

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Zero

10 volts

The same as that at a point 5 cm away from the surface

The same as that a at point 25 cm away from the surface

The image formed after objective lens of an astronomical telescope is

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Inverted

Diminished

Real

All of these

A Celsius degree is larger than a Fahrenheit degree by

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5/9

9/5

9/10

9/8

In compound microscope image formed is

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Real erect and diminished

Virtual inverted magnitude

Real inverted and magnified

Virtual inverted and magnified

The pair of quantities has same dimensions?

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Power, Work

Work, Torque

Impulse, Linear momentum

Both B and C

The principle of rocket motion is based on the

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First law of motion

Second law of motion

Third law of motion

None of these

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

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600°C

7600°C

800°C

900°C

Work energy principle is the work done on the body is equal to

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Change in power

Change in K.E.

Change in acceleration

Change in angular velocity

Nicrom wire is an example of

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Non ohmic device

Ohmic device

Neutral device

Charged device

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

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perpendicular line

parallel line

a ray of light

none of them

In the relations d sinθ = nλ, shows that the value of θ depends upon 'n' so the images of different colours are much separated in

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Low orders

Middle orders

High order

None of these

Steel is preferred for making springs over copper.Whey?

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Steel is cheaper

Young;s modulus of steel is more than that of copper

Young's modulus of copper is more than that of steel

Steel is less likely to be oxidized.

Is Boyle's law is applicable, to the isothermal process

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No

Yes

Some what applicable

None of these

Which of the following is dimensionally correct

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Pressure = energy per unit area

Pressure = energy per unit volume

Pressure = force per unit volume

Pressure = Momentum per unit volume per unit time

A solid subjected to deformation along one dimension

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Only have tensile stress

Only have compressive stress

Have both tensile and compressive stress

None of them

The rate of change of angular velocity is called

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Angular displacement

Angular acceleration

Instantaneous velocity

None of these

In a cubic crystal, all the sides meet at:

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60°

90°

109°

30°

10°

The efficiency of carnot's engine can never be 1 or 100% unless cold reservoir is

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100 K

1 K°

0 K°

None of these

Two wires of the same material have diameters in the ration 2 : 1 if they are stretched by the same force their elongations will be in the ratio

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8 : 1

1 : 8

2 : 1

1 : 4

The density of human blood is equal to that of

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Oil

Glycerin

Honey

Water

A stone is dropped from rest from the top of a tower 19.6m high.The distance traveled during the last second of its fall is (giving g = 9.8 m/s²)

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9.8 m

14.7 m

4.9 m

19.6 m

A chocolate cookie is a circular disk of diameter 8.5 ± 0.02 cm and thicknes 0.050 ± 0.005 cm the average volume in cm³ is

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2.83 ± 0.3

2.38 ± 0.27

11.35 ± 1.2

9.31 ± 1.12

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Work

Pressure

Momentum

Power

The deformation measured in terms of some twisting angle due to action of stress is known as

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Stress

Linear stress

Compressive stress

Shear stress

Electric potential of earth is taken to be because earth is a good

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insulator

Conductor

Semi-conductor

Dielectric

Acceleration is a physical quantity which is

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Scalar quantity

Vector quantity

Constant quantity

None of these

Two wave of intensities I an 4I superpose then the maximum and minimum intensities are

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5I and 3I

9I and I

9I and 3I

5I and I

The ratio of stress/strain is called as

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Modulus of elasticity

Bulk modulus

Shear modulus

Young's modulus

A highly irreversible process is

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Expansion

Explosion

Compression

None of these

The gravitational pull of earth on a mass of 20 kg on the surface of earth is

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20 N

196 N

19.6 N

1960 N

The approximate efficiency of dry cell battery is

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80%

90%

70%

50%

A sonar depth finder in a boat uses sound signals to determine the depth of water. Fourseconds after the sound leaves the boat it returns to the boat because of reflection fromthe bottom. Assume the speed of sound in water is 1,460 meters per second. The depth of the water is, in meters, :

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2,200

4,800

4,400

2,920

The magnitude of the scalar product can also written as

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Magnitude of vector and effective component of vector

Vector and effective component of vector

Vector and perpendicular component of vice vector

None of these

The initial velocity of a body moving along a straight line in 7 m/s.It has a uniform acceleration of 4 m/s².The distance covered by the body in the 5th second of its motion is

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25 m

35 m

50 m

85 m

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

Bodies falling freely under gravity provide good example of motion under

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non-uniform acceleration

uniform acceleration

variable acceleration

increasing acceleration

The viscosity of liquid is due to

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Adhesive force

Cohesive force

Gravitational force

Diffusion

If the dot product of two non-zero vectors vanishes,the vectors will be

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In the same direction

Opposite to each other

Perpendicular to each other

Zero

Newton's laws are suitable, for as compared to velocity of light

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Low speed

Very low speed

Very high speed

None of these

Yttrium barium copper oxide (Yba₂Cu₃O₇) becomes superconductor at

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163 K

-100 °C

both and b

None of these

The splitting of white light into several colors on passing through a glass prism is due to

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Refraction

Reflection

Interference

Diffraction

How is the interference pattern in Young's double slit experiment affected if the sodium light is replaced by red light of the same intensity

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The fringes will vanish

The fringes will become brighter

The fringes will increase

The fringes will decrease

When a body is stationary

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There is no force acting on it

The force acting on it are not in contact with it

The combination of the forces acting on it balance each other

The body is in vacuum

Bernoulli s equation is the basis of law of conservation of

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Energy

Mass

Charge

Momentum

A piece of copper and another of germinium are cooled from room temperature to 80K. The resistance of

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Each of them increases

Each of them decreases

Copper increases and germanium for

Copper decreases and germanium increases

A collision is an elastic collision in which

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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

On Celsius scale boiling point of water is taken as

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0°C

100°C

180°C

None of these

The law of thermodynamics which discusses the condition under which heat energy is converted into and equivalent amount of work is:

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1st

2nd

3rd

None of these

For a diatomic gas C_v=5/2R. The constant gamma for gas is

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5/7

4/35

7/5

35/4

Moment of inertia does not depend upon

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Angular velocity

Mass

Position of axis of rotation

None of these

Which of the following quantities is / are scalar ?

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Dipole moment

Electrical permitivity

Electric field

Electrical potential

The relative velocity before and after the collision is

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V₁+ V₂= V'₂+ V'₂

V₁- V₂= V'₂- V'₁

V₁- V₂=-( V'₂- V'₁)

None of these

For a point source of light the wave front produced are

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Circular

Spherical

Cylinrical

None

The SI units of impulse are

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Nm

Nm²

Nm^-1

Ns

The saturation of the material reached when magnetic flux density changes from

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Zero to minimum value

Zero to maximum value

Maximum to zero value

Minimum to negative value

Semi-conductor elements have atoms with

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2 valence electrons

3 valence electrons

4 valence electrons

5 valence electrons

Rotational kinetic energy of a hoop is

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K.E._rot = 1/2 mV²

K.E._rot = mV²

K.E.^rot = 1/4 mV²

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

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

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Total inernal reflection

Continuous refraction

Both a and b

Dispersion

The value of solar constant in SI system is

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1340 watt/m²

1340 m²/watt

1340 watt/m

One poise = ___________.

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0.1 Nsm^-2

0.1 Pascal second

1.01 x 10⁵N

both A and B

A rocket carries its own fuel in the form of a

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Liquid and oxygen

Solid and oxygen

Both

None of these

Blood is an/a

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Ideal fluid

Perfect fluid

Compressible fluid

Incompressible fluid

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

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Motionless

Vibrate violently

Fixed

Simply vibrate

If a force of 20 N makes an angle of 60° with the y-axis,then its vertical component will be

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5 N

17.32 N

10 N

8.66 N

Which force is the medium independent force ?

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Electrostatic force

Nuclear force

Gravitational force

All of them

In uniform circular motion the angular acceleration vector is

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Constant in magnitude and direction both

Constant in magnitude only

Constant in direction only

Varies in magnitude and direction both

Speed of efflux increases if

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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

When a vector is multiplied by a scalar, the product of the quantity will be

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A new vector quantity

New direction

Same direction

a and c

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

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Greater then

Smaller then

Equal to

None of these

The path followed by a ballistic missile is called

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parabolic trajectory

ballisitic trajectory

both of them

none of them

In superconductors, the resistance of a material drops to zero and no

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Power is dissipated

Energy is dissipated

Current is dissipated

None of these

The work done by the gas during the isobaric expansion is equal to

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Area of rectangle

Area of triangle

Area of parallelogram

None of these

When a body is moving with uniform positive acceleration, the velocity-time,then the body is said to have

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uniform deceleration

uniform negative acceleration

average acceleration

uniform positive acceleration

Physics is an important and basic part of physical sciences which is a

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Mathematical science

Experimental science

Statistical science

None of these

________ is a pattern which has got one more atom at the centre of a simple cube.

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Simple cube

Face centered cube

Body centered cube

None of these

Polaristion is a phenomenon associated with a certain type of wave.

Which condition must be fulfilled if the wave is to be polarised?

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It must be a longitudinal wave

It must be a light wave

It must be a transverse wave

The relative permitivity ∈_r for transformer oil is

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2.9

3.0

2.1

2.4

The product of force and time is called

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Momentum

Force

Impulse

None of these

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

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6.12 × 10^-3

6.18 × 10^-3

6.29 × 10^-3

6.79 × 10^-3

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

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Wider objective and light of short wavelength

Narrow objective and light of short wavelength

Narrow objective and light of longer wavelength

None of these

A motor runs at 20 rev/s and supplies a torque of 75Nm. Power delivered by it is

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6.12 hp

12.6 hp

7.3 hp

8.3 hp

A Perpetual motion is that motion which is

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Temporary

Continuous

Forever

None of these

The curie temperature of iron is

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600 C^o

650 C^o

700 C^o

750 C^o

Two point charges A and B separated by a distance R attract each other with a force of 12 x 10^-3 N.The force between A and B when the charges on them are doubled and distance is halved

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1.92 N

19.2 N

12 N

0.192 N

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

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1

0.5

2

0

The frame of reference in which Newton first law of motion holds is known as

Choose an answer

Inertial frame of reference

Non-Inertial frame of reference

Every frame of reference

None of these

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

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greater than the velocities as before the impact

equal to the velocities as before the impact

less than the velocities as before the impact

none of them

Insulators are those materials which valence electrons are bound

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Loosely

Tightly

Very tightly

None of these

Torque is a turning effect of a

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Body

Momentum

Force

None of these

If the line of action of force F passed through the axis of rotation or origin then its torque is

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Maximum

Minimum

Zero

None of these

Diffraction pattern has also been observed for:

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Proton

Neutron

Hydrogen atom

All of them

In old age, arteries carrying blood in the human body become narrow resulting in an increase in the blood pressure. This follows from

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Pascal's law

Stoke's law

Bernoulli's principle

Archimedes principle

High energy physics is the physics of

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Nucleus

Subatomic particles

Plasma physics

Astrophysics

The first superconductor was discovered by

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Fermi

Kmaerlinghormes

Weinberg

None of these

Ideal fluid is

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Steady flow

Non-viscous

Incompressible

All of these

If 'd' 'm' and fringe spacing ΔY are known, the interference effect due to light of λ

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Cannot be determine

Can be determined in same cases

Can be determined

None of these

A couple consists of

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Two equal and opposite forces acting at a point on a body

Two equal and parallel forces acting at a point on a body

Two equal and anti parallel forces acting at two different points on a body

All of these

The positions of two aeroplanes at any instant are at A (2, 3, 4) and B(5, 6, 7) from the origin in km. Find the distance between the two aeroplanes.

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3.2 Km

4.9 Km

5.0 Km

5.2 Km

Which type of fibre is used to send the signals of long distances?

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single mode step index fibre

multimode step index fibre

multimode graded index fibre

all of them

Basic principle of an optical fibre is

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Reflection

Scattering

Polarization

Total internal reflection

The advantage/advantages of fiber optics than radio wave carriers

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Much wider band width

Capability

Immunity

All of these

Gravitation is the property of matter which is

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External

Internal

Intrinsic

None of these

Pascal is a unit of

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Mass

Power

Pressure

Intensity of light

A longitudinal sinusoidal wave has wavelength of 1cm and a period of 2sec. Its wavevelocity is:

Choose an answer

50 cm/ sec

0.5 cm/ sec

5 m/ s

0.005 m/ sec

A force of 10N acts on a body of mass 2 kg for 2 sec rate of change of momentum of body is

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5kg m/sec²

10kg m/sec²

15kg m/sec²

None

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

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

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Decrease

Remain unchanged

Increase

Become zero

The typical speed of light, radio-waves, X-rays microwaves is

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28,000,0000 ms^-1

29,000,0000 ms^-1

30,000,0000 ms^-1

None of these

Alexander graham bell transmits a voice message via a

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Beam of light

Telescope

Compound microscope

Mirror

A ballistic missile moves under the result of the superposition of

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one independent motion

two independent motions

one dependent motion

two dependent motions

An n-type semiconductor is obtained by doping germanium or silicon with

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Tetravalent impurity

Trivalent impurity

Pentavalent impurity

Monovalent inpurity

When a stress changes the volume, it is called the

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compressional stress

tensile stress

shear stress

any one of them

The product of resistance and conductance of a resistors is equal to:

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1

Conductivity

Resistivity

Zero

Which of the following substances possesses the highest elasticity?

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Al

Copper

Steel

Rubber

The fluid which is incompressible and non viscous is called

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Ideal fluid

Non ideal fluid

Perfect fluid

All

The artillery shells travels along parabolic paths under the influence of

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magnetic field

electric field

electromagnetic field

gravitational field

The typical speed of Earth around the sun is

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29700 ms^-1

29600 ms^-1

29500 ms^-1

29400 ms^-1

The example of insulators are

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Copper

Nickel

Diamond

None of these

The photoelectric effect was explained by:

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Einstein

Davison

Hertz

Planck

The escape velocity of a body depends upon

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The mass of the body

The mass of the planet

Volume of body

Density of body

Michelsion devised the Michelson's interferometer in

Choose an answer

1981

1891

1851

1881

A bullet train move with the velocity of

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400 Kmh^-1

460 Kmh^-1

500 Kmh^-1

510 Kmh^-1

According to equation E = mc² Kg mass is actually the enrgy

Choose an answer

8 × 10¹⁵ J

9 × 10¹⁷ J

9 × 10¹⁶ J

8 × 10¹⁵ J

The unit of Planck's constant h is same as that of

Choose an answer

Energy

Work

Linear momentum

Angular momentum

The cause of mirage observed in deserts in bright sunlight is due to:

Choose an answer

Refraction of light

Reflection of light

Scattering of light

Total internal reflection of light

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

The domains are the small regions of the order of

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Millimeter

Micrometer

Micron

None of these

Blood is an incompressible fluid having density nearly equal to

Choose an answer

Milk

Honey

Water

None of these

The magnification is negative for

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Real image

Virtual image

Sometimes for real sometimes for real

Only for cancave lens

Which of the following curve in P - V diagram represent adiabatic process

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The spectrum of a star’s light is measured and the wavelength of one of the lines as thesodium’s line is found to be 589 nm. The same line has the wavelength of 497 nm whenobserved in the laboratory. This means the star is

Choose an answer

Moving away from the earth

Moving towards the earth

Stationary

Revolving around the planet

When a large number of atoms are brought close to one another to form a solid, each energy level of an isolated atom splits into sub-levels, called

Choose an answer

energy bands

energy shells

states

all of them

In an elevator moving vertically up with an acceleration g the force exerted on the floor by a passenger of mass M is

Choose an answer

Mg

1/2 Mg

Zero

2 Mg

The central point in the Newton's rings is dark due to

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Destructive interference

Constructive interference

Additional of path difference λ/2

b and c

When a crystal is subjected to stress, it tends to break or fracture along definite direction which is characteristic of a simple. This is called

Choose an answer

Cleavage

Allotropy

Isotropy

None of these

The difference between 1st ring fringe and 1st dark fringe is measured as

Choose an answer

λD/2d

λD/d

λD/4d

2λD/d

The magnitude of potential barrier for Ge is

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0.7 v

0.3 V

7v

3 v

When the velocity of a liquid flowing steadily in a tube increases,its pressure?

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Decreases

Increases

Remains same

Zero

The distance between the two adjacent slits is called

Choose an answer

Thickness of the slit

Distance between and two slits

Grating element

None of these

In Michelson interferometer if the moveable mirror is moved through a distance of 8λ then the number of fringes shifted are

Choose an answer

4

8

16

32

On Celsius scale freezing point of water is taken as

Choose an answer

0°C

100°C

180°C

None of these

Choose an answer

Equation of continuity

Bernoulli's theorem

Toricelli's theorem

None of these

The quality of the moving body is called

Choose an answer

Motion

Momentum

Force

None of these

A body will be in complete equilibrium, if

Choose an answer

any one of them

both of them

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

Viscus force depends upon

Choose an answer

Coefficient of viscosity

Velocity of objects

Radius of object

All of these

The equations for uniformly accelerated motion for body moving at

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Acceleration

Constant acceleration

Instantaneous acceleration

None of these

Measurement of a standard metre in terms of the wavelength of red cadmium light is

Choose an answer

1,563,163.5

1,553,363.5

155,553.5

1,553,163.5

A wire is stretched to double of its length.The strain is

Choose an answer

2

1

Zero

0.5

The original source of hydroelectric is

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Water

Wind

Sun

Moon

Coplanar forces are those, which act on a

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Single plane

All planes

Common plane

None of these

The vertical component of velocity of a projectile during its motion is minimum

Choose an answer

at the time of projection

at the highest point

just before hitting the plane of projection

all of them

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

Choose an answer

18

19

20

21

Solids have sharp melting points account of

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Long range order of atoms

Short range order of atoms

Equal strength of inter-atomic bonds

An isotropic nature

The rotational analogue of power is given by

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τω

τv

F ω

τ/ω

The arrangement or molecules or atoms in a crystalline solid can be studied by using:

Choose an answer

Chemical methods

Neutrons

X-ray techniques

Copper atoms

Both A and B

A convex ens acts as diverging lens when the object is placed

Choose an answer

Between F and 2F

At 2F

Within the focal length

Beyond 2F

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

The dimensions of ½at²are of

Choose an answer

length

Velocity

Acceleration

TIme

Einstein predicted the shift of light by sun coming from star towards Earths was the same as during the solar eclipse in 1919 is

Choose an answer

Φ = 1.235 sec of angle

Φ = 1.367 sec of angle

Φ = 1.693 sec of angle

Φ = 1.745 sec of angle

Glass and high carbon steel are

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Brittle substances

Insulator

Ductile substances

None of these

Rain drops are spherical because of

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Gravitational force

Surface tension

Low viscosity of water

Air resistance

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

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Power

Work

Force

None of these

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

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7.20 N

11.25 N

22.50 N

45.00

If resultant of two forces (F and F) acting on a point is F,then the angle between two forces is.

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0°

45°

60°

120°

If the water falls from a dam into a turbine wheel 19.6 m below,then the velocity of water at the turbine is

(Take g = 9.8 m/s²)

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9.8 m/s

19.6 m/s

39.2 m/s

98.0 m/s

The ballistic missiles are useful for

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Short ranges

Long ranges

Medium ranges

None of these

The critical temperature of lead is

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1.18 K

4.2 K

3.72 K

7.2 K

Negative of vector can be made when

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Magnitude is made negative

Directions is reverse with negative magnitude

Only direction is changed

None of these

Radian is the unit of angular displacement which is

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Less than degree

Greater than degree

Equal

None of these

Beta particles have penetration of about:

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100 times more than that of the gamma particles

100 times less than that of an alpha ray

100 times more than that of an alpha ray

10 times more than that of an alpha particle

If coplanar forces acting on a body form a closed polygon, then the body is said to be in equilibrium

Choose an answer

yes

False

Sometimes in equilibrium

None of these

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

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rocket

ballistic missile

guided missile

none of them

Identify the correct unit of pressure among t bese

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kgms^-1

kgm^-1s^-2

kgm²s^-2

kgm^-2s^-1

The example of vector product is

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Torque

Tangential velocity

Angular momentum

All of these