Question # 1

The inside cavity of the black body is

Choose an answer

painted white

painted silver

blackened with soot

painted red

Wave nature of particle was proposed by

Choose an answer

Einstein

Plank

De-Brogile

Max well

When a platinum wire is heated, it appears yellow at

Choose an answer

1600°C

900°C

1100°C

1300°C

the dilation of time applies to the timing processes which are:

Choose an answer

Physical

Chemical

Biological

All of these

None of these

In the compton's effect, it is found that the wavelength of incident x-rays is

Choose an answer

greater than the wavelength of scattered x-rays

equal to the wavelength of scattered x-rays

less than the wavelength of scattered x-rays

any one of these

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

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

Choose an answer

slowly

instantaneously

either of these

none of these

de-Broglies hypthesis was experimentally verified by

Choose an answer

Maxwell

Compton

Einstein

Davison and Germer

Intensity of light determines the:

Choose an answer

Energy of each photon

Number of photons

Speed of photons

Size of photons

None of these

When a position comes close to an electron they annihilate into

Choose an answer

one photon

two photons which travel in the same direction

two photons which travels in the opposite direction

two photons which travel in any direction

A non-inertial frame of reference is one, in which

Choose an answer

law of inertial is valid

all laws of physics are the same in all frames

a>0 or a<0

a=0

The special theory of relatively treats the problems involving:

Choose an answer

Inertial frames of reference

Non-inertial frames

Non-accelerated frame

Botha (A) and (C)

Both (B) and (C)

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

Choose an answer

1.66 x 10^-29m

1.74 x 10^-10cm

17.4 x 10^-6m

1.74 x 10^-10m

When low energy photon interact with a metal,which of the following effect is likely to be taken place

Choose an answer

pair production

photoelectric

Compton effect

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

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