Question # 1

The photoelectric effect, the maximum energy of photoelectrons depends on the

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particular metal surface

frequency of incident light

both of them

none of them

Compton was awarded Nobel prize in physics in

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1921

1923

1925

1927

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

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Newton

Joule

Joule-Sec

Joule-s^-1

Watt

The special theory of relativity is based on the

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one postulate

two postulates

three postulates

four postulates

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

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500°C

900°C

1100°C

1300°C

Strictly speaking, the earth is:

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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 idea of quantization of energy was proposed by:

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Einstein

Max.Planck

Maxwell

Bohr

Rutherford

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

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Remains constant

Decreases

Increases to infinity

Reduced to zero

Intensity of light determines the:

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Energy of each photon

Number of photons

Speed of photons

Size of photons

None of these

According to the Max plank, energy is redialed or absorbed in

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discrete packets

continuous waves

either of them

none of these

With the help of 50 K v electron microscope, a resolution of

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0.5 to 1 m to possible

1 m to 10 m is possible

0.5 to 1 nm is possible

1 to 10 nm is possible

the symbol to be used in relativity problems denotes:

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Dilated time

Proper time

Life time

Half time

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

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

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1900

1906

1912

1918

Wave nature of particle was proposed by

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Einstein

Plank

De-Brogile

Max well

A photon is considered to have

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Momentum

Energy

Wavelength

All of the above

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

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