Question # 1

All ________ conduct heat easily:

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Non metals

Gases

Material

Metals

Sliding friction can be converted into rolling friction by using

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Levers

Wedges

Ball bearings

Pulleys

__________ is a major source of heat:

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Mercury

Sun

Fire

Moon

Amount of heat that flows in unit time is called:

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Rate of flow of heat

Q/t

Conductivity

Both A and B

Which pair of physical quantities has same SI unit?

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energy , power

power , work

energy , work

work , momentum

According to Archimedes, upthrust is equal to

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Weight of displaced liquid

Volume of displaced liquid

Mass of displaced liquid

None of these

The value of g is maximum at:

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Mountains

Maximum height

Surface of earth

At 2R

Outer edge of the curved road is elevated to prevent

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Circular motion

Centripetal force

Skidding

Protection

"Latent" is derived from ............... word.

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Latin

English

Greek

Roman

Which of the following is the unit of momentum?

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Nm

kgms^-2

Ns

Ns^-1

The bad conductor of heat is:

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Iron

Copper

Air

Aluminum

Information storage devices work on the principles of

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Heat

Sound

Light

Magnetism

Electric potential and e.m.f.:

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Are the same terms

Are the different terms

Have different units

Both b and c

the water waves after striking the hurdle will:

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reflect

refract

diffract

all a b and c

Sound waves having frequency lower than 20 Hz are called:

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Ultrasonic

Infrasonic

Audible

Echo

The digits used in electronics are:

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1

0

0 and 1

1 and 2

According to Ohm's law V =________

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I²R

IR²

IR

I/R

If the distance is nspring is 'x' of mass 'm' attached with a spring then restoring force is:

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F =ma

F =kx

F = mx

F= m/a

The diameter of spherical mirror is called:

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Curvature

Aperture

Sphere

Both a and b

A positive electric charge:

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Attracts other positive charge

Repels other positive charge

Attracts a neutral particle

Repels a neutral particle

The half life of radium - 226 is 1620 years. If N is its total amount then after the four half lives, its left amount will be:

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1/2 N

1/4 N

1/8 N

1/16 N

If we double both the current and the voltage in a circuit while keeping its resistance constant, the power.

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remains unchanged

halves

doubles

four time

The collision between the gas molecules is

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Elastic

Inelastic

Both a and b

None of these

Entropy of measure of.

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Internal energy of system

Order of system

Disorder of system

Potential energy of system

The portion of the wave above mean level is called.

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Node

Antinode

Crest

Trough

Newton's laws of motion were published in

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1587

1687

1787

1887

the louder the sound, the greater will be its.

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Speed

Frequency

Amplitude

Wave length

The weight of an object an elevator moving down with an acceleration of 9.8 m/s2 will becomes

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Half

Double

Unchanged

Zero

The speed of sound in ari at 0 ^oC is 332 ms-1, Then the speed at 40 ^oC will be

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372 ms-1

356 ms-1

346 ms-1

332 ms-1

In which medium the speed of sound is greater.

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Oxygen

Air

Water

copper

The time rate of change of angular displacements called.

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Linear velocity

Linear speed

Angular velocity

Angular speed

The SI unit of angular momentum is

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J.S-2

J.S-1

J.S

J.m

Oil film floating on water exhibits colours due to

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Interference

Diffraction

Polarization

All of these

Albert Einstein got noble prize for service in:

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Pair production

Annihilation of matter theory

Compton effect

Photoelectric effect

_____ has the largest de Broglie wavelength at same speed.

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Proton

Alpha particle

Carbon atom

Electron

Due to polarization, electric field E.

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Increase

Decrease

First increases then decreases

Remain same

Force on a charged particle is zero when projected at angle with magnetic field.

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0 ^o

90^o

180^o

270^o

One of the applications of electrostatic induction is

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Laser

Photocopier

X ray machine

Wilson cloud chamber

The unit of impedance is.

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Henry

Hertz

Ampere

Ohm

Magnetic lines of force are.

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Imaginary

Real

Perpendicular

In phase with electric lines of force

Colour codes are used to calculate the.

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Nature of resistor

Numerical value of resistance

Potential difference

Current

For ohmic device the graph between V and I is.

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A straight line

Curve

Hyperbola

Parabola

The power factor of RL series circuit is.

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0

1

Less then 1

More than one

A block body is an ideal:

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Absorber

Radiator

Both a & b

None of above