Question # 1

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

In the expression of force experienced by electron, the direction of both v and B are

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parallel

zero

perpendicular

none of them

The SI units of momentum is

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kg m s^-2

kg ms

kg m s²

N-s

A body is floating in a liquid. The up thrust on the body is

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Equal to weight of liquid displaced

Zero

Less than the weight of liquid displaced

Weight of body-weight of liquid displaced

The rate of decay of radioactive substance

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is constant

decrease exponentially with time

varies inversely as time

decreases linearly with time

The induced current in the loop can be Increased by

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Using a stronger magnetic field

Moving the loop faster

Replacing the loop by a coil of many turns

All above

Both A and B

Which of the following can become a good permanent magnet

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iron

steel

both of them

none of them

When a charged particle passes through matter, it produces ionization, this effect is used in

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fission reaction

reactor

radiation detector

fusion reaction

In order to produce pair production, a photon must have a energy

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0.511 Me v

0.256 Me v

1.02 Me v

0.956 Me v

The working of galvanometer depends upon torque exerted on a current carrying coil in

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magnetic field

electric field

gravitational field

nuclear field

Strictly speaking, the earth is:

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An accelerated frame of reference

A non-inertial frame of reference

An inertial frame of reference

^{A non-accelerated frame of reference}

Both (A) and (B)

Under normal circumstances, the volume of blood is sufficient to keep the vessels

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flatted for all times

inflated for all times

inflated for small times

none of them

In a building, there are 15 bulbs of 40 watts, 5 bulbs of 100 watts, 5 fans of 80 watts and a heater of 1 kilowatt. The voltage of the electric main is 220 volts. The minimum efficiency of the main fuse of the building will be

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0.4 A

11.4 A

9.8 A

10.6 A

If we connect a A.C. volt meter to read A.C. voltage, It would read its:

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RMS value

Instantaneous value

Valued average over a cycle

Zero

Both (B) and (C)

The SI unit of magnetic flux is.

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weber

Nm^-1A^-1

tesla

gauss

In case of metallic conductors, the charge carriers are

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Protons

Electrons

Antiprotons

Positrons

Both A and B

With the propagation of a longitudinal wave through a material medium, the quantities transmitted in the propagation direction are

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Energy, momentum and mass

Energy

Energy and mass

Energy and linear momentum

Graphs which are used to illustrate the variation of velocity of an object with time are called

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distance time graphs

speed time graphs

velocity time graphs

acceleration time graphs

the current is pass through the straight wire. The magnetic field established around it has its lines of force:

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Circular and endless

Oval in shape and endless

Straight

Parabolic

All are true

The amplitude of oscillation of each atom in a metallic crystal rises with the

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rise in temperature

decrease in temperature

even temperature remains constant

all of them

When certain nucleus emits anα particle, its mass number:

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Increases by one

Decreases by one

Remain same

Decreases by four

None of these

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

When platinum wire is heated, it appears cherry red at

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1600°C

900°C

1100°C

1300°C

If d is the displacement of the body in time t, then its average velocity will be

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V_av= d x t

V_{av = t/d}

V_{av = d/t}

The expression for restoring force is

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F=ma

F=kx

F= -kx

Kx=ma

If the amplitude of sound is doubled and the frequency reduced to one-fourth, the intensity of sound at the same point will be

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Increasing by a factor of 2

Decreasing by a factor of 2

Decreasing by a factor of 4

Unchanged

Within each domain, the magnetic field of all the spinning electrons are

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parallel

antiparallel

perpendicular

all of them

Calculate the amount of charge flowing in 2 minutes in a wire of resistance 10Ωwhen a potential difference of 20 V is applied between its ends

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120 C

240 C

20 C

4 C

In the text book, the transistor amplifier circuit is a:

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Common emitter circuit

Common collector circuit

Common base circuit

Any of these

None of these

Electric flux is:

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Cross product of two vector

Dot product of two vectors

A vector quantity

A scalar quantity

Both (B) and (D)

Acceleration produced in a body by the force varies

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inversely as the applied force

directly as the applied force

directly as the mass of the body

none of them

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