Question # 1

The special theory of relativity is based on the

Choose an answer

one postulate

two postulates

three postulates

four postulates

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Choose an answer

thermoionic electrons

free electrons

photoelectrons

slow electrons

The unit of work function is:

Choose an answer

Joule

Electron volt

That of threshold frequency

Both (A) and (B)

None of these

Compton was awarded Nobel prize in physics in

Choose an answer

1921

1923

1925

1927

A black body is

Choose an answer

an ideal absorber

an ideal radiator

both of them

none of them

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Choose an answer

Wavelength

Frequency

Energy

Temperature

All of these

As the light shines on the metal surface, the electrons are ejected

Choose an answer

slowly

instantaneously

either of these

none of these

When a platinum wire is heated, it appears white at

Choose an answer

1600°C

900°C

1100°C

1300°C

In photoelectric effect the energy of ejected electrons depend on

Choose an answer

The frequency

The intensity

Both frequency and intensity

None of these

de-Broglies hypthesis was experimentally verified by

Choose an answer

Maxwell

Compton

Einstein

Davison and Germer

Strictly speaking, the earth is:

Choose an answer

An accelerated frame of reference

A non-inertial frame of reference

An inertial frame of reference

^{A non-accelerated frame of reference}

Both (A) and (B)

The energy of photon 'E' is proported to

Choose an answer

The magnetic field H

The electric field E

Both the electric and magnetic field H and E

Frequency

Due to relative motion of observer and the frame of reference of events, time always:

Choose an answer

Dilates itself

Contracts itself

Stretches itself

Both (A) and (C)

None of these

Pair production is the phenomenon in which

Choose an answer

matter is converted into energy

energy is converted into matter

light is converted into electrical energy

electrical energy is converted into light

Absolute motion cannot be detected

Choose an answer

in its own frame of references

in a different frame of references

both in its frame and different frame of references

none of these

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Choose an answer

1900

1906

1912

1918

More Classes

Other Links

ECAT Physics Chapter 19 Dawn of Modern Physics Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer