Question # 1

An example of photoconductor is:

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Boron

Carbon

Iron

Aluminum

Selenium

Flurescent screen is a screen where visible spot

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vanishes

is made

becomes small and large

none of these

If the distance between two charges is doubled,the force between them will become:

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Double

Half

One third

One fourth

Examples of physical quantities are:

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Length

Color

Effect of music

All of these

The amount of energy equivalent to 1 a.m.u is

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9.315 Mev

93.15 Mev

931.5 Mev

2.22 Mev

A body of weight 1 N has a kinetic energy of 1 joule when its speed is:

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1.46 m sec^-1

2.44 m sec^-1

3.42 m sec^-1

4.43 m sec^-1

In a moving coil galvanometer, the deflecting couple depends upon

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area of the coil

number of turns of coil

value of magnetic field

all of the above

A body of mass 1.0 kg is falling with an acceleration of 10 m/s². Its apparent weight will be (g=10 m/s²)

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1.0 kg wt

2.0 kg wt

0.5 kg wt

Zero

The change of order of vectors in a dot product of two vectors:

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Changes its value

Doesn't change it's value

Changes the direction product quantity

None of these

The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains

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3 more neutrons

3 more electrons

3 more protons

3 more ions

If the volume of the gas is to be increased by 4 times, then

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Temperature and pressure must be doubled

At constant P the temperature must be increased by 4 times

At constant T the pressure must be increased by four times

It cannot be increased

Referring to above figure, a changing current in coil P can be produced:

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At the instant the switch is closed

At the instant the switch is opened

With the help of rheostat

All of these

None of these

Ultra-violet rays differ from X-rays in that they

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Cannot be diffracted

Cannot be polarized

Have a lower frequency

Are deviated when they pass through a magnetic field

One torr is equal to

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13.33 N/m²

760 N/m²

760 mm Hg

133.3 N/m²

Amplitude in SHM is equivalent to_____ in circular motion:

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Diameter

Radius

Circumference

None of these

The magnitude of the force producing an acceleration of 10 m/sec2 in a body of mass 500 grams is:

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3 N

4 N

5 N

6 N

When angular acceleration is positive, the body rotates:

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Slower

Slowest

Faster

None of these

Which of the following changes at an antinode in a stationary wave?

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Density only

Pressure only

Both pressure and density

Neither pressure nor density

When a shall explodes a mid-air, the total momentum of its fragments is

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less than the momentum of shell

equal to the momentum of shell

greater than the momentum of shell

none of them

Which of the following is/are example/s if mechanical waves i.e. waves generated in _______:

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Rope

Coil of spring

Water

All of them

Energy required by an electron revolving in certain orbit to jump to an excited state is called:

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Ionization energy

Ionization potential

Excitation energy

Excitation potential

None of these

Position was discovered by Carl Anderson in

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1920

1925

1928

1932

The concept of field theory was put forward by

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Franklin

Kepler

Oersted

Michael Faraday

The holes created in the L and M shells are occupied by transitions of:

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Electrons from lower states

Electrons from higher state

Positrons from higher states

Electrons from K shell

Both (A) and (B)

There is no way to detect:

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Absolute uniform motion

Accelerated motion

State rest

State of motion

None of these

The instantaneous velocity of a body moving along a circle is directed

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along the radius

along the tangent

away from the circle

none of them

Which one of the following relations is correct?

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1 Wb-m²= Nm^-1A^-1

1 tesla = 104 gausses

1 Wb-m²= 1 tesla

All of the above

Matter is made up of very tiny particles called

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Atoms

Molecules

Ions

None of these

Transverse waves can be set up:

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Solids

Liquids

Gases

All of them

Alternating current can not be measured by D.C. ammeter because

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A.C. can not pass through D.C. Ammeter

A.C. changes direction

Average value of current for complete cycle is zero

D.C. Ammeter will get damaged

If time period of a pendulum is doubled by increasing its length, then its frequency will

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Also be doubled

Become half

Become one fourth

Becomes four times

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