Question # 1

Which of the following is the smallest unit?

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Millimeter

Angstrom

Fermi

Metre

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 size of the molecules in comparison with the separation between the molecules is

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Small

Very small

Extremely small

None of these

The flow is said to be streamline or lamina when every particle

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Moves in different direction

Moves along the same path as

Slowly moves in one direction

None of these

The temperature of igneous rocks is about

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100 ^oC

200 ^oC

250 ^oC

270 ^oC

According to the relation for constructive destructive interference, the point of contact has zero thickness of air so it should have

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No interference

Conductive interference

Destructive interference

None of these

Davisson and Germer received the Nobel prize for their work on:

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Wave nature of particle

Corpuscular nature of wave

Dual nature of particle

All of them

If an iron ball and a wooden ball of the same radius was released from a height h in vacuum,then time taken by both of them to reach ground will be

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Unequal

Exactly equal

Roughly equal

Zero

The unit of power of a lens is

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Meter

Watt

Horsepower

Dioptre

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

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

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300 J

400 J

50 J

56 J

The horizontal component of a force at an angle 60° with it is 50N. The value of force is

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43.3 N

50 N

100 N

120 N

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

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Ideal

Viscous

Non ideal

None of these

Fight of rocket in the space is an example of

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Newton's first law

Newton's third law

Newton's second law

all of them

One electrostatic unit (esu) of charge is equivalent to

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3.3 x 10 coulomb

3.3 x 10^-9coulomb

3.3 x 10^-10coulomb

3.3 x 10^-11coulomb

In order to observe interference , the interfering beams must be

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monochromatic

coherent

either of them

both of them

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

Stress that induces a change in the shape of the body is named as

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Tensile stress

Volumetric stress

Shear stress

None of these

The mass distribution of a rigid body is

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Uniform

Not uniform

Both

None of these

Which of the following is conserved when light waves interfere

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Intensity

Energy

Amplitude

Momentum

Hails fall faster than rain drops due to their

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Greater size

Greater mass

Greater area

None of these

Recently a complex crystalline structure known as Yetrium Barium Copper Oxide have been reported to become superconductor at

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125 K

25 K

263 K

163 K

In Michelsion's interoferometer, if the moveable mirror is moved through a distance 0.05 mm and 500 finges are observed, then the wavelength of light used is

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1 x 10^-7m

2 x 10^-7m

1.5 x 10^-7m

1 x 10^-8m

The heart of machine is

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Lamp and camera unit

Aluminium drum

Charging unit

All of them

In a astronomical telescope the final image for normal vision is formed at

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The focal of the eye piece

The least distance of the distinct vision

The focus of the objective lens

Infinity

Fire optics has ability to transmit

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Thousand telephone conversation

Several television programs

Numerous data signals between stations

All of these

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.

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11%

8%

5%

1%

When there are number of forces acting on a body and the body is

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At rest

Motion

Rest or moving with uniform velocity

None of these

The frequency of the fundamental mode of open at one organ pipe is 400 Hz. Ifone end of pipe is closed the fundamental frequency will be

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800 Hz

600 Hz

400 Hz

200 Hz

The terms phase difference and path difference are:

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Same

Different

Equal

None of these

The units of torque and couple are

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N-m and N-m²respectively

N-m and N

N-m^-1for both

N-m²and N-m respectively

The SI unit of momentum is

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Kgms^-1

Kgms^-2

N.S

a and c

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

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λD/2d

λD/d

λD/4d

2λD/d

A space ship has the radius of 9.8m. To produce an artificial gravity of 9.8m/sec² the spinning speed is

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9.8 m/sec

1 m/sec

19.6 m/sec

None of these

A device which convert DC into AC is calleD)

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Invertor

Generator

Rectifier

Motor

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

Which color is not used in the combination of colors for color printing?

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cyan

magenta

green

yellow

The product of moment of inertia and angular velocity is called

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Angular momentum

Kinetic energy

Torque

Work

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

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different

equal

zero

variable

Which of the Following bulb will glow Brightest?

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100W

200W

300W

400W

The typical wavelength of the signal which we sent in the optical fibre is

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1000 nm

100 m

1.3 mn

1.3μm

The direction of velocity is along the direction of

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Motion

Displacement

Velocity

None of these

A hole in a semi-conductor material is treated as

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positive charge

negative charge

neutral

none of them

The orbital radius as the revolving body is revolving is

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Very Smaller

Larger

Smaller

None of these

The frequency of an open pipe is f. if one end is closed then its fundamental frequencywill be:

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f/2

3f/4

f

2f

Supplementary unit/units in S.I. Units are

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Radian

Steradian

Candela

a and b

When a germanium atom is doped with phosphorous atoms it becomes

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N-type semiconductor

p-type semiconductor

An insulator

None of them

The waves produced in a stretched string are called

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Stationary waves

Mechanical waves

Transverse mechanical waves

None of these

The resultant of two equal forces is double of either of the force.The angle between them is

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0°

60°

90°

120°

Where the intensity of gravitational field of earth is maximum

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Center of earth

Equator

Poles

Same every where

Which quantity has the same units as impulse?

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force

work

linear momentum

acceleration

Maximum detail of object can be seen from a microscope wen light used is of

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Shorter wavelength

Longer wavelength

White light

Any light

In order to get interference using two light rays:

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The sources should be monochromatic and coherent

The sources should have the same frequency

Superposition should be linear

All of these

Light appears to travels in straight lines since

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It is not absorbed by the atmosphere

It is reflected by the atmosphere

Its wavelength is very small

Its velocity is very large

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

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Zero

0.1 N

0.5 N

0.05 N

For a quantity to be a vector it must has/have

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Magnitude and direction

Obey law of vector addition

Both (a) and (b)

Only (a)

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

In a couple, the resultant of two forces is

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2F

F

F / 2

Zero

An electric field lines provides the information about

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Electric force

Direction

Medium

All of them

A charge is 90C passes through a wire in 1 hour and 15 minutes. Wat is the current in the wire?

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10mA

20mA

15mA

25mA

Where in standing wave, do the vibrations of the medium occur?

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Only at the nodes

Only at the antinodes

At all points between the nodes

At all points between the antinodes

Why laser rays are used to measure long distance?

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Laser rays propagate in a straight

Laser rays are not absorbed

Laser rays are most coherent waves

Laser rays are high velocity waves

The pressure P of a gas at constant temperature varies with its density P

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Directly

Inversely

Equal

None of these

The ratio of fringes with for bright and dark fringes is

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1 : 2

2 : 1

1 : 4

1 : 1

If the mass of the bullet is m fiber from a rifle of mass M with a velocity v. The recoiling of rifle is V', then the momentum of rifle is

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

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Chemical methods

Neutrons

X-ray techniques

Copper atoms

Both A and B

Ball pen functions on the principle of

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Viscosity

Boyle's law

Gravitational force

Surface tension

The efficiency of a particle heat engine:

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can be 100%

Cannot be 100%

Is always zero

None of these

Generally thermometers make use of the fact that most of the liquids

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Compress on heating

Expand on heating

Evaporate on heating

Sublime on heating

A stress which decreases the stress along one dimension is known as:

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Compressive stress

Tensile stress

Linear stress

Both (B) and (C)

Angular velocity is proportional to

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1/r

1/r²

1/r⁵

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

Gain of operational amplifier is independent of;

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Internal structure

External Structure

Batteries

Potential changes

A precise measurement is the one which has

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Absolute uncertainty

Less absolute uncertainty

More absolute uncertainty

None of these

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

The light from the sun reaches to earth with wavefronts

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Spherical

Cylindrical

Plane

None of these

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

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lattice point

crystal lattice

cubic crystal

unit cell

In a uniform circular motion of a particle, the direction changes but not its

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Angular displacement

Magnitude of velocity

Force towards centre

b and c

Multimode step index fibre is useful for

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short distance

long distance

both a and b

none of them

A polaroid is:

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An adjustable shutter

A device used to analyze polarized light

A device used in polarimeter

A light filter

In an inertial frame of reference the weight of body equal to

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Force of attraction

Coulomb's force

Force of gravity

All of these

Wavelength of light of frequency 100 Hz is

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2 x 10⁶m

3 x 10⁶m

4 x 10⁶m

5 x 10⁶m

The body is in a dynamic equilibrium when it is

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At rest

In motion

In uniform motion

Acceleration motion

Insulators are those materials which valence electrons are bound

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Loosely

Tightly

Very tightly

None of these

Linear momentum is a vector quantity and has direction of

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Its displacement

Velocity

Acceleration

None of these

Satellites are held in orbits by gravitational pull by Earth and are put into orbit by

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Initial velocity

Rockets

Escape velocity

None of these

A.H Compton studied the scattering of X-rays by loosely bound electrons from a graph target in:

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1905

1911

19251

1923

The dark areas retain their

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negative charges

positive charges

both positive and negative charge

none of these

A water hose of internal diameter of 20 mm discharges 30 kg of water in 60 sec. Calculate speed of water

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1.2 ms^-1

1.6 ms^-1

1.8 ms^-1

2.1 ms^-1

The axis of ration of an object will not change its orientation unless

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Internal torque acts

Internal torque acts in one direction

External torque acts

None of these

Polarization is a phenomenon in which

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Electric intensity decreases

Potential difference decreases

Charge 'Q' decreases

All of them

The dimensions of velocity are

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[LT]

[LT²]

[LT^-1]

[LT^-2]

Every crystalline solid has

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definite melting point

different melting points

may or may not be definite

none of them

When a sillicon crystal is doped with a pentavalent element, such an extrinsic semi-conductor is called

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p-type semi-conductor

n-type semi-conductor

either of them

none of them

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

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Straight conductor

A horse shoe magne

Any magnet

A bar magnet

Which one of the following waves cannot be polarized

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Radio waves

X-rays

Transverse waves in a string

Longitudinal waves in a gas

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

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Small

Large

Very large

None of these

If red light is incident on sea water it appears

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Red

Green

Blue

Yellow

Which pair of the following force will never give resultant force of 2N?

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2 N and 2 N

1 N and 1 N

1 N and 3 N

1 N and 4 N

At the top of the trajectory of a projectile the directions of its velocity and acceleration are

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Perpendicular to each other

Parallel to each other

Inclined to each other at an angle of 45°

Antiparallel to each other

A unit vector may be defined by the

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Surface

Direction by normal drawn vector

Along the direction of surface

a and b

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

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mV²/r

ωr/V

V²/r

ωV/r

When light travels from one medium to another which are separated by a sharp boundary the characteristic which does not change is

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Velocity

Wavelength

Frequency

Amplitude

The position of a new wavefront after a certain interval of time can be found by constructing a surface that is

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A tangent

A tangent envelope

Curved surface

None of these

Which of the following light move faster in water

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Red

Violet

Green

Blue

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10^-15 m is

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9 x 10⁵ V

9 V

8 x 10⁶ V

80 V

In an isothermal process, the change is internal energy is

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Maximum

Zero

Very small

None of these

For fast moving particles, such as atomic particles in an accelerator, the following branch of physics is applicable

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newtonian mechanics

classical mechanics

relativistic mechanics

all of them

In YDS experiment, fringe spacing means the distance between two consecutive_____fringes:

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Bright

Dark

Any of A or B

None of these

The terminal velocity of a 2 cm radius ball in liquid is 20 cms^{-1. What would be the terminal velocity if the radius of the ball were halved? Keeping the mass constant}

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80 cms^-1

40 cms^-1

20 cms^-1

5 cms^-1

Which device converts the light signals which these amplified and decoded

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Photo cell

Photo diode

Photo transistor

None of these

At what temperature adiabatic change equivalent ot isothermal change

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0°C

0K

Critical temperature

Above critical temperature

For interference to occur the two light waves should be:

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Of two different frequencies

Coming from opposite directions

Of high intensity

Monochromatic

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

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To fall vertically down

To fall at an angle going from west east

To fall at an angle going from east to west

The information given is insufficient to decide the direction of rain

Moment of inertia of a solid disc or cylinder is

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mr²

1/2 mr²

1/3 mr²

1/4 mr²

Which one is numeric quantity?

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Strain

Plane Angle

Impulse

both A and B

The uncertainty of any measurement may occur due to

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Limitation to an instrument

Natural vibrations of the object

Natural imperfections of a persons sense

All 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

Two equal forces (P each) act at a point inclined to each other at an angle of 120°.The magnitude of their resultant is

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P/2

P/4

P

2P

Diameter of the nucleus is of the order of

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10^-10m

10^-12m

10^-15m

10^-18m

Unit of impulse in

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Newton

Kg m

Kg m/s

Joule

Telescope is an optical device used for viewing

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Near objects

Not far distance

Distant objects

b and c

The velocity of light in vacuum can be changed by changing

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Frequency

Amplitude

Wavelength

None of these

To make a permanent magnet, a material should have

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hihg retentivety and small coercive force

low retentivety and high coercive force

low retentivety and small coercive force

high retentivety and high coercive force

Which of the following can become a good temporarily magnet?

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iron

steel

both of them

none of them

A 5 kg weight is accelerated from rest to 60 m/s in 1 sec What force acts on it

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5 x 60 N

(5/60) x 981 N

(60)² x 52 N

(5/2) x 60² x 981 N

In Millikan's oil drop experiment an oil drop is observed to move vertically upwards. The upward motion of the drop is due to

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Gravity

Viscosity

Buoyancy

Electric Field

Pick out the wrong pair:

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Charge-coulomb

Temperature-thermometer

Pressure-barometer

sp.gravity-hygrometer

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

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In a semi-conductor material, current flows due to

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positive charge

negative charge

both 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

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

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Reflected

Refracted

Continuously refracted

None of these

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?

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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 ball of mass m moving with uniform speed collides elastically with another stationary ball.The incident ball will lose maximum kinetic energy when mass of the stationary ball is:

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m

2 m

4 m

Infinity

The numerical values of the ratio of displacement to the distance is

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Always less than one

Always equal to one

Always more than one

Equal to or less than one

In Bernoulli's equation, the work done due to fluid is

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The base of equation of continuity is on the

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First law of motion

Law of conservation of mass

Law of conservation of charge

Law of conservation of momentum

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

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Shape

Length

Volume

Any of these

None of these

The K.E.of a light and a heavy object is same.Which object has maximum momentum?

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Light object

Heavy object

Both have the same momentum

Data is not sufficient

The electric field due to an infinitely long thin wire at a distance R varies as

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1/R

1/R²

R

R²

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 two electric charges originally 8 cm apart are brought closer together, until they are 2 cm apart the force between them is now greater by a factor

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2

4

8

16

A body falls freely from rest.It covers as much distance in the last second of its motion as covered in the first three seconds.The body has fallen for a time of

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3 s

5 s

7 s

9 s

Polymeric solids have the properties like

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No definite shape

No definite structure

Partially crystalline solids

All of them

Dolphins have bodies to assist their movement in water are

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Irregular bodies

Closer to streamline body

Stream lined bodies

None of these

The motion of a body in a straight line is the motion in

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one dimension

two dimensions

three dimensions

four dimensions

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

Choose an answer

1 N

9.8 N

4.9 N

None of these

The angle with the horizontal at which an underwater swimmer will see the setting sun is

Choose an answer

91°

32°

49°

69°

A convex lens is dipped in a liquid whose refractive index is equal to the material of the lens. Then its focal length will become

Choose an answer

Infinite

Zero

Extremely small

Extremely large

If a metallic bob is suspended by a string in the vertical place, it will be in?

Choose an answer

complete equilibrium

translational equilibrium

rotational equilibrium

none of them

An inertial frame of reference in which acceleration is

Choose an answer

Very high

Very very low

Zero

None of these

Sunset makes sky appears reddish because of:

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Diffraction of sun rays

Refraction of light

Scattering of light from dust particles

Polarization of ligth

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

Crystalline solids are also

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Metals

Ionic compound

Ceramics

All of them

A person A is going up in a balloon while another person is going down into a mine.Both are measuring the gravitational field.

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The field measured by both A and B goes on increasing.

The field measure by A Increases while the measured by B decreases

The field measured by A decreases while that measured by B decreases

The field measured by A decreases while that measured by B increases

X-ray diffraction has been very useful in determining structure of

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Hemoglobin

Double helix structure of DNA

Blood speed

a and b

The property of bending of light around the obstacle is known is

Choose an answer

Interference

Polarization

Diffraction

None of these

Signal from a remote control to the device operated by it travels with the speed of:

Choose an answer

Sound

Light

Ultrasonics

Supersonics

The phenomenon of blending of around edges of an obstacle is called:

Choose an answer

Interfarance

Defraction

Polorisation

None of above

Water is filled up to a height 'H' in a tank.A hole is made at depth 'h' below the water level.The velocity of efflux of the fluid is

Choose an answer

2gh

gh

√2gh

√gh

Choose an answer

Davisson and Germer, in their experiment used:

Choose an answer

Nickle crystal

Lead crystal

Graphite crystal

Glass

If the two reflected waves reinforce each other then the firm as seen from the parallel beam of monochromic light will look

Choose an answer

Dark

Bright

Sometimes bright and dark

None of these

Which of the following is conservative field

Choose an answer

Electrostatic field

Frictional field

Viscous field

All of these

Blood is an incompressible fluid having density nearly equal to

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Milk

Honey

Water

None of these

Torque is a physical quantity which is

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Scalar quantity

Vector quantity

Constant quantity

None of these

Examples of first law of thermodynamics

Choose an answer

Working of bicycle pump

Human metabolism

Brakes applied by an auto mobile

All of these

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

The acceleration of the rocket is

Choose an answer

a = MV/m

a = mM/V

a = mM/2V

a = mV/M

No body begins to move or comes to rest of itself said by

Choose an answer

Thomos Young

Abu Ali Sena

Newton

None of these

The approximate efficiency of Nuclear reactor

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33%

32%

39%

45%

For assessment of total uncertainty when percentage uncertainties are

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Added

Subtracted

Divided

Multiplied

Power is defined as

Choose an answer

P = ΔV/Δt

P = ΔW/Δt

P = mV/t

P = mt/V

The energy dissipated per cycle for iron in hysteresis loop is

Choose an answer

less than for steel

equal to the steel

more than the steel

any one of them

A frame of reference stationed on Earth is approximately an example of

Choose an answer

Inertial frame

Non-inertial frame

Every frame

None of these

If focal length of objective is increased

Choose an answer

Magnifying power of compound microscope decreased

Magnifying power of astronomical telescope increases

The diameter of the objective lens

None of these

One cannot see through fog because

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Fog absorbs light

The refractive index of fog is infinity

Light suffers total reflection at the droplet in a fog

Light is scattered by the droplets in fog

The spin angular momentum is the angular momentum of a

Choose an answer

Rotating body

Revolving body

Spiming boy

None of these

The only significant motion possessed by the mono-atomic gas molecules is:

Choose an answer

Translatory

Rotatory

Vibratory

None of these

The law of conservation of energy is the base of

Choose an answer

Stoke's theorem

Carnot's theorem

Bernoulli's theorem

None of these

In a never system, the repeaters are placed at about

Choose an answer

50 km

75 km

100 km

125 km

Which of the following cannot have an effect on the weight of an object?

Choose an answer

The distance of the object from a planet

The acceleration of the object

The placement of the object on a different planet

The mass of the object

Star twinkle due to

Choose an answer

The fact that they do not emit light continously

The refractive index of earth's atmosphere fluntuates

The star's atmosphere absorbs its light intermittently

None of these

The high blood pressure is known as

Choose an answer

Diastolic

Systolic

High blood pressure

None of these

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

Choose an answer

Cannot be determine

Can be determined in same cases

Can be determined

None of these

A capacitor of capacity 1 μF is charged to 1 kV.The energy stored in J

Choose an answer

5

0.5

0.005

50

According to Stoke's law drag force depends on

Choose an answer

Initial velocity

Final velocity

Terminal velocity

Instantaneous velocity

Geometrical optics cannot give following characteristics for a microscope

Choose an answer

Image position

Image size

Resolution of image

Any of the above

Biomass is a potential source of renewable energy. This includes all the organic material such as

Choose an answer

Crop residue

Natural vegetation

Animal dung

All of these

The electrical conductivities of insulators are ranging from

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10^-5to 10^-10(Ω m)^-1

10^-10to 10^-15(Ω m)^-1

10^-5to 10^-15(Ω m)^-1

10^-10to 10^-20(Ω m)^-1

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

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Increase

Remain Constant

Decrease

Increase slightly

The maximum stress that a material can withstand is known as

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plastic point

elastic point

yield point

ultimate tensile strength

Radius of planet A is twice that of planet B and the density of A is one third that of B. the ratio of the acceleration due to gravity at the surface of A to that at the surface of B is

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2 : 3

3 : 2

3 : 4

4 : 3

The cores of electromagnets used for alternating currents where the specimen repeatedly undergoes magnetization and demagnetization should have

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broad hysteresis curves

narrow hysteresis curves

any one of the them

none of them

In spectrometer the function of collimator is to produce

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Diverging beam of light

Converging beam of light

Parallel beam of light

None of these

The dimensions [MLT^-1] refers to the quantity

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Momentum

Angular frequency

Angular displacement

Angular acceleration

If light of low wavelength is used in Young's double slit experiment then width of the fine will

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Decreases

Increase

Not fixed

No change

Which of the following is the most common method to obtain polarized light?

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selective absorption

reflection from different surfaces

refraction through crystals

scattering by small particles

When the density is constant for the steady flow of incompressible fluid equation of continuity becomes

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ρ₁A₁V₁ = ρ₂A₂V₂

ρ₁m₁A₁V₁ = ρ₁m₁A₂V₂

A₁V₁ = A₂V₂

None of these

The direction of torque is

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The same as the direction of the corresponding applied force

Opposite to the direction of the applied force

Perpendicular to the direction of the applied force

Parallel to applied force

The activity of a radioactive sample is 1.6 curie and half-life is 2.5 days. Its activity after 10 days will be:

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0.8 Curie

0.1Curie

0.4 Curie

0.16 Curie