Question # 1

The term impulse means, the force applied on a body for

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Permanently

Temporary

Very short interval of time

None of these

The expression for the terminal velocity V_t is given by

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V_t = mg/36πη

V_t = mg/6πηr

V_t = mg/6πηa

V_t = mg/6π²ηr

Conditions for interference are that the two sources should be coherent and:

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At the far off distance

Close together

Coinciding

None of these

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

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1

Conductivity

Resistivity

Zero

An axis which is at right angle to both X and Y and Y axes direction is in space is called

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Unit vector axis

Zero vector axis

Z-axis

None of these

The body is in a state equilibrium when it is

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At rest

In motion

In rotation

None of these

The clouds float in the atmosphere because of

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Their low temperature

Their low viscosity

Their low density

Creation of low pressure

One radian is equal to

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360^o/π

58^o

57^o

57.3^o

If f = 5 cm and d = 25 cm then the magnification will be

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2

4

5

6

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

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Friction due to tyres

Force of brakes

The driver of the car

Force by steering wheel

The dielectric constant K of an insulator cannot be.

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3

8

6

∞

Indicate the force / forces which obeys inverse square law

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Strong Nuclear force

Gravitational force

Coulomb's force

b and c

Two forces of 6 N and 8 N can produce a resultant of

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0 N

1 N

10 N

18 N

A ball falls on the surface from 10 m height and rebounds to 2.5 m.If the duration of contact with the floor is 0.01 seconds then the average acceleration during contact is

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2100 m/s²

1400 m/s²

700 m/s²

400 m/s²

A visual representation of an electric field in terms of an electric field lines was proposed by

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Coulomb

Faraday

Gauss

Lenz

Which of the following quantities is / are scalar ?

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Dipole moment

Electrical permitivity

Electric field

Electrical potential

An ECG records the electric process in heart between

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Points on human skin

Two limbs of human foot

Two lungs of human

None of these

Moment of inertia of a thin ring or hoop is

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mr²

2/3 mr²

5/6 mr²

1/3 mr²

Change in entropy is positive when heat is

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Removed

Added

Remains as is it

None of these

The body moving with uniform velocity may be

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in equilibrium

accelerating

changing in direction

changing in magnitude

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

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at the time of projection

at the highest point

just before hitting the plane of projection

all of them

Such substance which break soon after crossing the elastic limit is called

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Weak substance

Ductile substance

Brittle substance

Organic substance

Pressure exerted by a gas in merely momentum transferred to the walls due to the continuous collisions of molecules of the gas

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Per unit area

Per sec per unit area

Certain area

None of these

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

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upward direction

rightward direction

clockwise direction

anticlockwise direction

When the velocity of a body is increasing, the acceleration produced is

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No acceleration produced

Negative acceleration

Positive acceleration

None of these

Mathematically, the instantaneous acceleration is represented by

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For incident angles equal or greater than the critical angle the glass air boundary will act as a

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Convex mirror

Concave mirror

Mirror

None if them

A person moves 30m north then 20m east then 30√2 m south west His displacement from the original position is

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14 m south west

28 m south

10 m west

15 m east

The speed of light in a medium of refractive index 1.5 is

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3 x 10⁸ms^-1

4.5 x 10⁸ms^-1

2.0 x 10⁸ms^-1

None of these

In an astronomical telescope is the objective has the focal length f_o is

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Small

Very small

Long

None of these

If 5000 lines/cm are ruled on a diffraction grating, the element is:

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5 x 10^-5m

2 x 10^-6m

5 x 10^-6m

2 x 10^-5m

T in Kelvin=_______

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273+°C

273-°C

273+°F

273-°F

A body is in its state of stress when it is

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Displaced from its equilibrium position

Remains at rest when shape changed

Their angles change

All of them

2 d sin θ = nλ can be used to determine the

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Inter planar spacing

Wavelength

Incident angle

All of these

The speed of sound in air is

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320 ms^-1

323 ms^-1

330 ms^-1

333 ms^-1

At 0 K a piece of Ge and Si is a perfect

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Conductor

Insulator

Semiconductor

None of these

When a radioactive nucleus remits a beta particle, the proton neutron ratio:

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Decreases

Increases

Remain same

None of the above

The acceleration produced in the body varies

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Directly with the applied force

Inversely to the mass of the body

Both

None of these

Diffraction is concerned with the superposition of

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very large number of secondary wavelets

a few secondary wavelets

two secondary wavelets

no secondary

The largest satellite system in managed by countries

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112

140

126

107

Which one of the following is the example of reversible reaction

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Melting of ice

Work done against friction

Heat produced by current

Conduction of heat from hot to cold body

Suppose the water flows out from a pipe at 3 kg s^-1and its velocity changes from 5m s^-1to zero on striking the wall, the force exerted by water on wall will be

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5 N

10 N

15 N

20 N

A person is sitting in a traveling train and facing the engine.He tosses up a coin and the coin falls behind him.It can be concluded that the train is

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Moving forward and gaining speed

Moving forward forward and losing speed

Moving forward with uniform

Moving backward with uniform speed

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

The smallest three dimensional basic structure in a crystalline solid is called

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lattice point

crystal lattice

cubic crystal

unit cell

When temperature increases, viscosity of liquids

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Remains constant

Increases

Decreases

Becomes double

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1.02 x 10^-3ms^-1

0.12 x 10^-3ms^-1

1.1 ms^-1

1.21 ms^-1

Arsenic antimony or phosphorus are impurities of

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p-type

n-type

May be p-type or n-type

None of these

To increase the magnification of a telescope

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The objective lens should be of large focal length and eyepiece should be of short focal length

The objective and eyepiece both should be of large focal lengths

Both the objective and eyepiece should be of smaller lengths

The objective should be small focal length and eyepiece should be of large focal length

Wavelength of red color as compared to that of violet color is

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Smaller

Longer

Equal

None of these

Which of the given elements is a diamagnetic material

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Antimony

Bismuth

Copper

All of these

The critical temperature T_c for lead is

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5.4 K

6.3 K

6.9 K

7.2 K

Viscus force depends upon

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Coefficient of viscosity

Velocity of objects

Radius of object

All of these

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 SI units of torque is

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Nm²

Nm

Nm^-1

Nm^-2

Propagation of light in an optical fiber requires that light should be

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Refracted from air to fiber

Continuously refraction

Totally reflected within the fiber

Both B and C

A ball is dropped vertically down and it takes time t to reach the ground.At time t/2:

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The hall had covered exactly half the distance

The velocity of the ball was V/3 where V is the velocity when it reached the ground

The ball had covered less than half the distance

The ball had covered more than half the distance

An airplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m.When it is vertically above a point A on the ground a bomb is released from it.The bomb strikes the ground at point B.The distance AB is

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1200 m

0.33 km

3.33 km

33 km

For maximum horizontal range, the angle of projection must be:

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0°

45°

60°

90°

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

A point charge Q is placed at the mid-point of a line joining two charges,4q and q. if the net force on charge q is zero,then Q must be equal to

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-q

+q

-2q

+4q

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

A snooker ball moving with velocity v collides head on with another snooker ball of same mass at rest. If the collision is elastic, the velocity of second snooker ball is

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Zero

Infinity

V

2 V

A ball is thrown upwards with a velocity of 100 m/s.It will reach the ground after

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10 s

20 s

5 s

40 s

A precise measurement is the one which has

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Absolute uncertainty

Less absolute uncertainty

More absolute uncertainty

None of these

The centre of gravity of an object is

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The point at which the gravity not acts

The point at which the total torque is minimum

The geometrical centre of the body

The point at which the weight of the object seems to act

Which one of the material is not polymer

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Glass

Natural rubber

Polyethene

Polystyrene

The dimensions of force are

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[MLT^-1]

[M^oLT^-2]

[MLT^-2]

[ML⁰T^-2]

All the food you eat in one day has the energy equivalent to petrol of

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1/5 litre

1/3 litre

1/8 litre

1/6 litre

The ratio of SI units to CGS units of gravitational constant G will be

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10^-3

10

10²

10³

Bodies falling freely under gravity provide good example of motion under

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non-uniform acceleration

uniform acceleration

variable acceleration

increasing acceleration

Which of the following pair of quantities have the same units?

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stress, Young's modulus

Young's modulus, bulk modulus

Stress, bulk modulus

All of them

Charles Coulomb measured the force between two charges in

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1860 AD

1890 AD

1874 AD

1871 AD

A wider objective and the use of blue light of short wavelength produces

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Interference

Diffraction

Less diffraction

Polarization

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

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114.6 ms^-1

114.6 kms^-1

11.46 ms^-1

1.146 ms^-1

Magnetic permeability is maximum for

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Dia-magnetic

Ferromagnetic

Paramagnetic

Non-magnetic

When a radioactive nucleus emits a 𝖰 −paritcles, the mass number of the atom:

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Increases by one

Decreases by one

Remains the same

Decreases by four

The terms phase difference and path difference are:

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Same

Different

Equal

None of these

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

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800°C

500°C

300°C

100°C

None of these

The unit of Stefan Boltzman constant σ is:

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W/mK⁴

Cal/m³K²

W/m²K⁴

K/m²K⁴

The approximate efficiency of liquid fuel rocket is

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49%

50%

48%

47%

The typical speed of human running is

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1 ms^-1

2 ms^-1

4 ms^-1

5 ms^-1

The rate of decay radioactive substance:

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Is constant

Decrease exponentially with time

Varies inversely with time

Decrease linearly with time

Which of the following is not dimension less

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Poission ration

Sharing strain

Longitudinal strain

Volume stress

Can you add zero to a null vector ?

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No

Yes

Yes in some cases

None of these

The cause of mirage observed in desert is

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Refraction

Reflection

Scattering

Total internal reflection

Conventionally, all the distances p, q, f, are measured from ______ of the lens

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Focus

Optical center

Edges

Centre of curvature

A semi conductor in its extremely pure from is known as

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extrinsic semi-conductor

intrinsic semi-conductor

either of them

none of them

A spherical wavefront is that which has

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A source

A point source

An extended source

None of these

The device which is used to measure the degree of hotness or coldness of the object.

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Thermometer

Barometer

Hypermeter

None of these

In deriving Bemoulli's equation, it is assumed that the fluid is

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Incompressible

Non-viscous

In a steady state

All of these

Astrophysics is the branch of physics deals with the

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Physics of oceans

Physics of stars and galaxies

Physics of earth crust

None of these

The temperature of sun is measured with

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Platinum thermometer

Gas thermometer

Vapour pressure thermometer

Pyrometer

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

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the gravitational field is uniform

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

weight is unaltered by attitude

weight of an object varies with its distance from earth

The work by the body is maximum when it has angle

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30^o

60^o

90^o

0^o

Examples of first law of thermodynamics

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Working of bicycle pump

Human metabolism

Brakes applied by an auto mobile

All of these

Angular magnification of a simple microscope is given as

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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 tome

Horizontal straight line

None of these

In thermodynamics, the internal energy is a function of

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Time

State

Temperature

None of these

A wire breaks of stretched by more than 3mm. It is cut into equal parts. Then each part can be stretched with out-breaking by

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0.75 mm

1.5 mm

3.0 mm

6.0 mm

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

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insulator

Conductor

Semi-conductor

Dielectric

At points where the crest (or trough) of one wave coincides with the crest (or trough) of the other wave, the wave produces

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destructive interference

constructive interference

diffraction

dispersion

A 50 kg man with 20 kg load on his head climbs up 20 steps of 0.25 m height each.The work done in climbing is

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5 J

350 J

100 J

3430 J

Huygen's principle is used to study the

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formation of wavefronts

propagation of wavefronts

nature of light

speed of light

The effect of decrease in pressure with the increase in speed of the fluid in horizontal pipe is drive from

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Bernoulli's theorem

Venturi effect

Torricelli's theorem

Diastolic effect

Which one of the following phenomenon cannot be explained on the bases of Huygen's theory?

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Refraction

Reflection

Diffraction

Formation of spectrum

Acceleration means the speed of the body is

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Increasing

Decreasing

Just stop

None of these

1 revolution is equal to

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2π radian

360^o

Both

None of these

The law of conservation of linear momentum is valid for:

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Atoms only

Molecules only

Other systems only

All of them

Light signals in an optical fibre eventually become dim and must be regenerated by devices called

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transmitters

receivers

photodiodes

none of them

Tick which of the following is not state variable:

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Heat energy

Pressure

Entropy

Volume

There is a certain frequency below which no electrons are emitted from the metal surface, this frequency is known as:

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Critical frequency

Threshold frequency

Maximum frequency

Minimum frequency

Spectrum of sun consists of

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Bright lines

Dark lines

Bright bands

Dark bands

An average energy used to make a car is

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4 × 10⁷ J

9 × 10⁹ J

7 × 10⁸ J

8 × 10⁹ J

The momentum of particle is numerically equal to its K.E What is the velocity of the particle

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9 ms^-1

3 ms^-1

2 ms^-1

1 ms^-1

A typical rocket ejects the burnt gases at speeds of over

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4000 ms^-1

5000 ms^-1

6000 ms^-1

None of these

The dimensions of displacement is

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[ L ]

[ L²]

[ L³]

None of these

The temperature at which the vibrations become so great that structure of the crystal breaks up, is called:

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Critical temperature

Temperature of vaporization

Melting point

Both A and C

Both A and B

The effect is to increase the inflation the bag is

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To compress the blood vessels

To increase external pressure

To cut off the flow of blood

All of these

The blood vessels are inflated eve in

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Relaxed states between heart beat

Working state between hear beat

Occasionally

None of these

For a gas obeying Boyle's law, if the pressure is doubled the volume becomes:

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One half

Double

Four times

None of these

At what temperature adiabatic change equivalent ot isothermal change

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0°C

0K

Critical temperature

Above critical temperature

The total linear momentum of an isolated system remains

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Constant

Variable

Zero

None of these

Real gases strictly obey gas laws at:

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High pressures and low temperatures

Low pressures and high temperatures

High pressures and & temperatures

None of these

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

Choose an answer

1.18 x 10²JK^-1

1.20 x 10⁴J Kg^-1

1.23 x 10³JK^-1

1.23 x 10⁴J Kg^-1

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

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900 ms^-1

950 ms^-1

980 ms^-1

990 ms^-1

Solids having partially field conduction bands are

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Insulator

Semiconductor

Super conductor

Semi conductor

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

The original source of tides is

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Ocean

Sun

Earth

Moon

The retarding force of the stream of water on a motor boat moving with a uniform velocity of 30 ms^-1is 5000 N The power of motor boat is

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1.50 kw

15 kw

105 kw

150 kw

What is the average translational kinetic energy of the molecules in a gas at temperature 27 CC°

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5.62 x 10^-21J

5.96 x 10^-27J

6.21 x 10^-21J

6.29 x 10^-27J

After curie temperature iron is

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Ferromgnetic

Diamagnetic

Paramagnetic

None

The light which has components in all directions is called

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unpolarized light

polarized light

intense light

none of them

An instrument called a sphygmomanometer measure

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Density of water

Blood pressure

Milk density

None of these

Two equal, antiparallel and non-collinear forces are called

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Net force

Couple

Torque

None of these

Every crystalline solid has a melting point

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Definite

Not definite

Any

Change every time

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

The units of the temperature coefficient of resistant are

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ΩK^-1

K^-1

ΩK

(ΩK)^-1

For a freely falling elevator

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a = W

a = T

a = 0

a = g

The ratio of fringes with for bright and dark fringes is

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1 : 2

2 : 1

1 : 4

1 : 1

Heat is a form of

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Power

Work

Energy

Motion

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

The Bernoulli's equation often expressed in

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Viscus force between two layers depends on

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Relative velocity of the layers

Distance between layers

Surface area of layers

All of these

Radian is an angle which is

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Solid angle

Plane angle

Angle

None of these

The maximum range of the projectile is the horizontal distance covered is

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Maximum

Distance

Minimum

None of these

Capacitor is a device use to store the

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A.C. current

D.C. current

Charge

Voltage

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

Velocity is a physical quantity which is

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Scalar quantity

Vector quantity

Variable quantity

None of these

Zero error of the instrument is a type of _____

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Random error

Personal error

Systematic error

Classified error

The temperature at which the reading of Fahrenheit thermometer will be double that of a centigrade thermometer is

Choose an answer

160°C

180°C

140°C

100°C

When satellite is moving in a circle, it has an aceleration

Choose an answer

mV²/r

ωr/V

V²/r

ωV/r

The forbidden energy gap in semiconductors

Choose an answer

Lies just below the valence band

Lies just above the conduction band

Is the same as the valence band

Lies between the valence band and conduction band

The characteristics of steady flow is

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Non-viscous

Incompressible

Streamline

All of these

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

Choose an answer

Ductile

Brittle

Malleable

Hard

Soft

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

Choose an answer

20 j

30 j

40 j

60 j

Light of wavelength 800 n m is incident on a pair of slits, forming fringes 4.0 mm apart on a screen. What is the fringe when light of 400 nm is used and the slit separation is halved?

Choose an answer

2.0 mm

1.0 mm

4.0 mm

0.5 mm

In case of uniform circular motion which of the following physical quantity do not remain constant?

Choose an answer

Speed

Momentum

Kinetic energy

Mass

Two metallic sphere of radius 1 cm and 2 cm get equal quantity of charge. Which has greater surface charge density

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1^st sphere

2^nd sphere

Both get equal surface

None

The magnetic field produced due to the current in a straight wire is proportionalto the :

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Electric current

Conducting material

Length of the wire

Diameter of the wire

A special alloy called Alnico is known as

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Soft magnetic material

Hard magnetic material

In between soft and hand magnetic material

None of these

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

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3 m along y=axis

3 m along negative x-axis

3 m along positive x-axis

6 m along negative x-axis

Zirconia is classified as:

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Ceramic solid

Ionic compound

Metal

Either A or B

Either B or C

The property of light which does not change with the nature of the medium is:

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Frequency

Amplitude

Wavelength

None of these

If a point source of light is placed at the focus of a convex lens the rays coming out of the lens will constitute

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Plane wave fronts

Cylindrical wave fronts

Spherical wave fronts

All of above

The approximate efficiency of dry cell battery is

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80%

90%

70%

50%

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

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400 Hz and 4 kHz

100 Hz and 100 kHz

50 Hz and 50kHz

400 Hz and 400 kHz

A diffraction grating of length 2cm has 4000 lines The grating element is

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0.5 x 10^-2 cm

5 x 10⁴

5 x 10^-4

0.5 x 10^-4 cm

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

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Increase its speed

Decrease its momentum

Change its direction

Keep it moving with the same speed

The error is constant for ______ error

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Random

Systematic

Both (a) and (b)

None of these

Semi-conductor elements have atoms with

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2 valence electrons

3 valence electrons

4 valence electrons

5 valence electrons

Which of the following strain are possible in solids

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Linear

Volumetric

Shear

All of these

A cylinder cannot roll on

Choose an answer

A rough horizontal plane

A smooth horizontal plane

A rough inclined plane

A smooth inclined plane

Colour of thin film will not show result from

Choose an answer

Scattering of light

Dispersion of light

Interference of light

Both a and b

A circular scale is attached and graduated in

Choose an answer

One degree

2 degrees

Half degree

None of these

In Young's double slit experiment, the fringe width depends on

Choose an answer

wavelength of the light used

distance between the slits and screen

distance between the slits

all of them

If the K.E.of a body becomes four times of the initial value.then new momentum will

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Become twice its initial value

Become three times.its initial value

Become four times.its initial value

Remains constant

A tritium and alpha particle enter the magnetic field with same kinetic energy, what will be the ratio of their radii?

Choose an answer

3:4

√3: 1

√3: 4

√3:√2

A pendulum bob is suspended inside a lift moving upward with constant velocity.If mass of the bob is 50 g then its weight inside the compartment is

Choose an answer

Zero

0.1 N

0.5 N

0.05 N

Which one light source can travel faster through optical fibre is

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Infra red

Visible

Ultra violet

All of these

The quantity F x t is called as

Choose an answer

momentum

velocity

acceleration

impulse

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

Choose an answer

6.79 cm

6.95 cm

7.52 cm

7.62 cm

Fight of rocket in the space is an example of

Choose an answer

Newton's first law

Newton's third law

Newton's second law

all of them

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

Who gave the idea of light as wave ?

Choose an answer

Newton

Huygen

Thomos Young

Bragg

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

Choose an answer

Power

Work

Force

None of these

Most widely used optical fibres are those which propagate light by

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total interval reflection

continuous refraction

both of them

none of them

For a moving body. at any instant of time

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If the body is not moving the acceleration is necessarily zero

If the body is slowing.the retardation is negative

If the body is slowing.the distance is negative

If displacement.velocity and acceleration at that instant are known,we can find the displacement at any given time in future.

The object is placed at the principle focus of a simple microscope if the focal length of the lens is 2cm what is the magnifying power of the microscope

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13.5

12.5

Infinity

None of these

The dimensions of expression V_f = V_i + at. Taking the R.H.S

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[LT]

[LT²]

[LT^-1]

[LT^-2]

The direction of the linear momentum is the direction of

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speed

velocity

weight

none of them

An are equal to half of the radius subtend angle of ________ at the center of circle.

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.π rad

2π rad

1/2π rad

1/2 rad

When a body acquired terminal velocity falling in a viscous medium than the acceleration

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a = -ve

a = +ve

a = g

a = zero

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

A ballistic missile is

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Unpowered

Unguided

Both

None of these

The speed of commercial jet (air liner) is

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200 ms^-1

267 ms^-1

327 ms^-1

335 ms^-1

The acceleration of a motor car is 8 m/s².If the diameter of its wheel be 2 metre,its angular acceleration will be

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8 m/s²

8 radian /s²

16 m/s²

16 radian/s²

If an electron vertically downwards, then the horizontal component of the earth’s magnetic field will deflect it to wards

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West

East

North

Coplanar forces are those, which act on a

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Single plane

All planes

Common plane

None of these

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

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energy bands

energy shells

states

all of them

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

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1.75 days

3.5 days

7 days

14 days