Question # 1

Band spectrum in produced by

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H

He

H₂

Na

A point charge Q is placed at the mid-point of a line joining two charges 4q and q. if the net force on charge q is zero. then Q must be equal to

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-q

+q

-2q

+4q

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Both an ammeter and voltmeter should have small resistance

Both an ammeter and a voltmeter should have large resistance

An ammeter should have large resistance and a voltmeter should have small resistance

An ammeter should have small resistance and a voltmeter should have large resistance

The conductivity of a superconductor is

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Infinite

Very large

Very small

Zero

A couple produces

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Purely linear motion

Purely rotational motion

Linear and rotational motion

No motion

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by monochromatic blue light of the same intensity

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Fringe width will decrease

Fringe width will increase

The fringe width will remain unchanged

Fringes will become less intense

In a Millikan's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10-19 C. The number of excess electrons on the drop is

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3.9

4

4.2

6

Two point charges placed at distance of 20 cm in air repel each other with a certain force.When a dielectric slab of thickness 8 cm and dielectric constant K is introduced between these point charges force of interaction becomes half of its previous value Then K is approximately.

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2

4

√2

1

Absolute temperature can be calculated by

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Mean square velocity

Motion of the molecule

Both (A) and (B)

None of these

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

Energy is stored in the choke coil in the form of

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Heat

Magnetic energy

Electric energy

Electro -magnetic energy

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