Question # 1

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

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100 J

1.6 x 10^-17J

100 eV

1.6 x 10^-17eV

There is no way to detect:

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Absolute uniform motion

Accelerated motion

State rest

State of motion

None of these

According to Einstein, with the great increase in the speed of the body the relativistic length of the body

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Remains constant

Decreases

Increases

Reduces to zero

A particle having mass and charge equal to that of an electron is called:

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Proton

Positron

Pion

Pi-meson

Both (C) and (D)

The concept of direction and position are purely

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absolute

relative

absolute or relative

none of these

the symbol to be used in relativity problems denotes:

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Dilated time

Proper time

Life time

Half time

None of these

If a material object moves with the speed of light 'C' its mass becomes

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Equal to its rest mass

Four times of its rest mass

Double of its rest mass

Infinite

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

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decreases

first increases then decreases

increases

any one of them

According to the special theory of relativity, time is

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absolute quantity

not absolute quantity

constant quantity

none of these

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

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2.9 s

3.0 s

6.6 s

9.6 s

When a platinum wire is heated, it appears dull red at about

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500°C

900°C

1100°C

1300°C

A photon is considered to have

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Momentum

Energy

Wavelength

All of the above

Photoelectrons are emitted when ultraviolet light falls on:

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Casium

Silver

Potassium

Any of these

None of these

The general theory of relativity treats problems involving

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inertial frame of references

accelerating frame of references

both of these

none of these

According to the special theory of relativity

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mass and energy are same entities

mass and energy are same entities but interconverible

mass and energy are different entities but interconverible

mass and energy are different entities but non-interconveritble

The existence of position was predicted by Dirace in

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1920

1925

1930

1928

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