Question # 1

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

The conductivity of a superconductor is

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Infinite

Very large

Very small

Zero

Center of mass is a point

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Which is geometric center 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

Band spectrum in produced by

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H

He

H₂

Na

Shunt required in an ammeter of resistance R to decrease its deflection from 30 ampere to 10 ampere is

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R/4

R/3

R/2

R

The henry is the unit for

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Resistance

Magnetic flux

Magnetic field

Inductance

A conducting wire is drawn to double its length Final resistivity of the material will be

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Double of the original one

Half of the original one

One-fourth of the original one

Same as original one

The mass defect for the nucleus of helium is 0.0303 a.m.u What is the binding energy per nucleon for helium in MeV?

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28

7

4

1

The volt/metre is the unit of:

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Potential

Work

Force

Electric field intensity

At 0° K which of the following properties of a gas will be zero?

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Kinetic energy

Potential energy

Vibrational enegy

Density

A body is dropped from a tower with zero velocity reaches ground in 4s. The height of the tower is about

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80 m

20 m

160 m

40 m

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