Question # 1

In a voltmeter the conduction takes place due to

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Electrons only

Holes only

Electrons and holes

Electrons and ions

The conductivity of a superconductor is

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Infinite

Very large

Very small

Zero

The nucleus 6C12 absorbs an energetic neutron and emits a beta particle (β). The resulting nucleus is

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₇N¹⁴

₅B¹³

₇N¹³

₆C¹³

At constant volume temperature is increased. Then

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Collision on walls will be less

Number of collisions per unit time will increase

Collisions will be in straight lines

Collisions will not change

Centre of mass is a point

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Which is geometric centre of a body

From which distance of particles are same

Where the whole mass of the body is supposed to be centered

Which is the origin of reference frame

A piece of fuse wire melts when a current of 15 ampere flows through it.

With this current, if it dissipates 22.5 W, the resistance of fuse wire will be

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Zero

10 ohm

1 ohm

0.10 ohm

Ball pen function on the principle of

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Viscosity

Boyle's law

Gravitational force

Surface tension

Planck's constant has the dimensions of:

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Energy

Momentum

Frequency

Angular momentum

Which of the following is not thermo dynamical function?

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Enthalpy

Work done

Gibb's energy

Internal energy

Quantity that remains unchanged in a transformer is

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Voltage

Current

Frequency

None of these

A particle moves along a circular path under the action of a force. The work done by the force is

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Zero

Positive and non-zero

Negative and non zero

None of the above

The magnetic moment of a circular coil carrying current is

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Directly proportional to the length of the wire in the coil

Inversely proportional to the length of the wire in the coil

Directly proportional to the square of the length of the wire in the coil

Inversely proportional to the square of the length of the wire in the coil

A person standing near the track of a fast moving train has tendency to fall towards it because of

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Vibration due to motion of train

Gravitation force of attraction between person and trains

The high speed of train

Some other effect

In which case application of angular velocity is useful?

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When a body is rotating

When velocity of body is in a straight line

When velocity is in a straight line

None of these

What will be the ratio of the distance moved by a freely falling body from rest in 4th and 5th seconds of journey?

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4 : 5

7 : 9

16 : 25

1 : 1

The dot product of two vectors is negative when

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They are parallel vectors

They are anti-parallel vectors

They are perpendicular vectors

None of the above is correct

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