Question # 1

The example/s of non-electrical energy to electrical is/are:

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Chemical energy

Mechanical energy

Heat energy

Both (A) and (B)

All of these

If a 40 watt light bulb burns for 2 hours. how much heat is generated

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288 x 10³J

288 x 10⁸J

288 x 10⁵J

288 x 10⁶J

The He-Ne laser discharge tube is filled with:

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85% He

15% He

50% He

60% He

85% Ne

Acceleration in a body is always produced in the directin of:

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Velocity

Weight

Force

Botha B and C

The bands below the valence band are

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completely filled and play active part in conduction process

completely filled and plays no part in conduction process

completely filled and play active part in conduction process

not completely filled and play no part in conduction process

When three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be

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180 watt

10 watt

20 watt

60 watt

For the conversion of galvanometer into voltmeter, we connect a

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small resistance in series with galvanometer

small resistance in parallel with galvanometer

high resistance in parallel with galvanometer

high resistance series with galvanometer

Arsenic, antimony and phosphorus are the elements from

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third group

fourth group

fifth group

none of them

Computer chips are made from

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Conductors

Semiconductors

Insulators

Both A and B

To turn the transistor OFF, the base current is set:

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At maximum value

At zero

Either (A) or (B)

All are correct

None of correct

The CRO deflects the beam of electrons, when they passes through uniform

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electric field

gravitational field

magnetic flax

magnetic field

The relation Cp > Cv by an amount equal to

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Gas constant

Universal gas constant

Both

None of these

If the power of a lens is 4 diopters then is focal length is

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20 cm

25 cm

50 cm

400 cm

The law of conservation of momentum says that the total angular momentum of the system remains constant if no external

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Force acts on it

Torque acts on it

Frictional force action it

None of these

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

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Inertial frame

Non-inertial frame

Every frame

None of these

Two bodies A and B each of mass 2 kg moving towards right collide with each other elastically,after collision

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A stops and velocity of B increases

Velocity of both decreases

Both moves with the same velocity

Both interchange their velocities

In everyday life, when two balls collide then after collision, they the velocities as before the

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greater than the velocities as before the impact

equal to the velocities as before the impact

less than the velocities as before the impact

none of them

The direction of a vector in a space is specified by

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One angle

Two angles

Three angles

Cannot be specified

In young's double slit experiment the separation between the slit is halved and distance between the slit and screen is doubled.The fringe width is

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Unchanged

Halved

Doubled

Quadrupled

Light has:

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Wave nature

Particle nature

Dual nature

None of them

A body moving in a circular path with constant speed has

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Constant acceleration

Constant retardation

Variable acceleration

Variable speed and constant velocity

An electron and a proton are projected at right angles to a uniform magnetic field with

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the electron trajectory will be less curved than proton’s trajectory

the electron trajectory will be more curved than proton’s trajectory

) both trajectories will be equally curved

) both particles continue to move along a straight lins

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