Question # 1

A coil of constant area is placed in a constant magnetic field. An induced current is produced in the coil when:

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The coil is distorted

The coil is rotated

The coil is neither distorted nor rotated

Both A and B

None of these

The rate of decay of a radioactive substance

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decrease exponentially with time

decreases linearly with time

increases linearly with time

increases exponentially with time

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

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ON switch

off switch

function switch

none of these

Radioactivity was discovered by

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Rutherford

Henri Becqureal

Maxwell

James Chadwick

Balmer series was identified in:

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1685

1785

1885

1985

1585

A full-scale deflection is obtained in a galvanometer with a current of few

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ampere

volts

milliampere

ohm

One kilogram of different substances contain

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same number of molecules

different number of molecules

may be same or different

none of them

For a given angle of projection, if the time of flight of a projectile is doubled, the horizontal range will increases to

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Four times

Thrice

Once

Twice

A rotating body tends to be slower, when its angular acceleration is:

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Positive

Negative

Zero

Infinity

When the droplet moves with terminal velocity in a fluid, the net force acting on the droplet is:

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F_D-mg

Zero

mg-F_D

None of these

A flywheel accelerates from rest to an angular velocity of 7 rad/sec in 7 seconds. Its average acceleration will be:

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49 rad/sec²

1 rad/sec²

0.16 rev/sec²

Both A and C

Both B and C

A ball is dropped from a height of 4.2 meters. To what height it will rise if there is no loss of KE after rebounding?

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4.2 m

8.4

12.6

None of these

In bringing an electron towards another electron, electrostatic potential energy of system

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Decreases

Increases

Remains uncharged

Becomes zero

High speed meteors rushing through air reduces to ashes because of:

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Force of gravity

High resistance of air

Drag force

None of these

If the value of C in a series RLC circuit is increased, the resonant frequency

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Is not affected

Increase

Remains the same

Decreases

When some compass needles are placed on a card board along a circle with the center at the wire, they will

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Point the direction of N-S

Set themselves tangential to the circle

Point in the direction of E-W

None of these

Point in direction of S-E

Each atom in a metal crystal vibrates about a fixed point with an amplitude that:

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Decrease the rise in temprature

Is not affected by rise in temprature

Increase with rise in temprature

Both (B) and (C)

None of these

Work is a

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Scalar quantity

Vector quantity

Base quantity

None of these

γ-rays behave like a particle because they explain the

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Compton effect

Photoelectric effect

Pair-production

all the above

Mass of neutron is

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1.67 x 10^-31kg

1.67 x 10^-27kg

9.1 x 10^-31kg

1.67 x 10^-19kg

Micheal Faraday and joseph Henry belong respectively to:

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USA and England

England and France

England and USA

USA and France

None of these

The thermistors are usually made of

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Metals with low temperature coefficient of resistivity

Metals with high temperature coefficient of resistivity

Metal oxides with high temperature coefficient of resistivity

Semi conducting materials having low temperature coefficient of resistivity

In a container having water filled up to a height h, a hole is made in the bottom. The velocity of water flowing out of the hole is

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Independent of h

Proportional to h^1/2

Proportional to h

Proportional to h²

γ-rays are

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electrostatic waves

electromagnetic waves

heavy particles

longitudinal waves

Pair production take place when energy ofγ-rays photon is

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equal to 1.02 Mev-

greater than 1.02 Mev

less than 1.02 Mev

none of these

The work done in moving a body between two points in a conservative field is independent of the

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Direction

Force applied

Path followed by the body

Power

Resistance is measured in

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volts

ampere

ohm

watt

Two forces of 10N and 8N are applied simultaneously to a body. The maximum value of their resultant is:

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20 N

-2 N

18 N

36 N

When force and displacement are perpendicular to each other than work is equal to

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Unity

Infinity

Zero

-Fd

A rotating wheel accelerates up to the value of 0.75 rev/sec²after 2 seconds of its start. Its angular velocity becomes:

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9.42 rad/sec

2.6 rev/sec

1.5 rev/sec

Both A and C

Potentiometer is more sensitive than voltmeter, because

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Voltmeter has a very high resistance

Voltmeter has a very low resistance

Potentiometer does not draw any current from a source of unknown potential difference

Potentiometer is sensitive

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