Question # 1

Momentum is a parameter associated with

Choose an answer

wave motion

particle motion

neither wave nor particle motion

none of these

The value of threshold frequency for different metals is

Choose an answer

different

same

may be different or may be same

none of these

In photoelectric effect the energy of ejected electrons depend on

Choose an answer

The frequency

The intensity

Both frequency and intensity

None of these

The special theory of relativity is based on the

Choose an answer

one postulate

two postulates

three postulates

four postulates

In order to produce pair production, a photon must have a energy

Choose an answer

0.511 Me v

0.256 Me v

1.02 Me v

0.956 Me v

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Choose an answer

1890

1895

1900

1905

The Einstein's changes in length, mass and time are not observed in common life because

Choose an answer

We dont observer then seriously

The masses are too large

Their speed is too small than the speed of right

All of the above

A photon is considered to have

Choose an answer

Momentum

Energy

Wavelength

All of the above

According to the special theory of relativity, time is

Choose an answer

absolute quantity

not absolute quantity

constant quantity

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

The energy of the 4th orbit in hydrogen atom is

Choose an answer

2.5 ev

- 3.5 ev

-0.85 ev

-13.6 ev

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

Max Planck received the Nobel Prize for his discovery of energy quants in:

Choose an answer

1718 AD

1918 AH

1818 AD

1918 AD

None of these

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

The positron was discovered by:

Choose an answer

In cosmic radiation

In 1932

By Carl Anderson

All above

By direc

The energy of a photon is represented by

Choose an answer

h/c²

h/T

hc²

hf/c²

More Classes

Other Links

Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics 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