Question # 1

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

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Physical

Chemical

Biological

All of these

None of these

Wave nature of particle was proposed by

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Einstein

Plank

De-Brogile

Max well

Which one of the following physical quantities changes with relativistic speed

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Length

Mass

Time

All of the above

According to the de-Brogile relation, an object of large mass and ordinary speed has

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very small wavelength

very large wavelength

very small frequency

all of these

The energy of photon 'E' is proported to

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The magnetic field H

The electric field E

Both the electric and magnetic field H and E

Frequency

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

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100 ev

10⁶e v

10³e v

1.0 e v

Photoelectric effect takes place with a photon of:

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Very high energy

Very low energy

Low energy

High energy

None of these

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

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number of photoelectrons

size of the photoelectrons

charge on photoelectrons

K.E of photoelectrons

Electromagnetic -radiation means:

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Photons

protons

Electrons

Mesons

None of these

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

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Dilates itself

Contracts itself

Stretches itself

Both (A) and (C)

None of these

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

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pair production

photoelectric effect

Compton effect

None of these

The concept of direction and position are purely

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absolute

relative

absolute or relative

none of these

A photon is considered to have

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Momentum

Energy

Wavelength

All of the above

When platinum wire is heated, it appears cherry red at

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1600°C

900°C

1100°C

1300°C

The length contraction happens only

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Opposite to the direction of motion

along the direction of motion

perpendicular to the direction of motion

In any direction

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

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pair production

Compton effect

photoelectric effect

relativity

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

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