Question # 1

The path of Gama rays in Wilson cloud chamber is

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Irregular

Dense and straight

Thin and continuous

Thin and discontinuous

X-rays spectrum may be

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Continuous spectrum

Discontinuous spectrum

Line spectrum

Continuous and line spectrum

In annitilation of matter, positron and electron pair disappears into two

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Alpha particles

Beta particles

Game particles

X-rays

Nuclear force exists between

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Proton proton

Neutron -neutron

neutron -proton

All of these

If an object moves with velocity of light the apparent mass of the object as compared to list original mass is

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greater

Smaller

Same

zero

Transistor stands for

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Transfer of resistance

Transfer of current

Transfer of power

Transfer of voltage

The half life of a radioactive substance depend on.

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Pressure

Temperature

Amount of substance

No external influences

The capture of neutron by a proton results in the formation of.

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Deuteron and gama rays

Deuteron and alpha particle

Triton and Beta particles

Tritron and X rays

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

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Pair production

Compton effect

Photo electric effect

Zeeman effect

The most familiar example of radioactive dating is.

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Nitrogen dating

Carbon dating

Hydrogen dating

Helium dating

The nucleus of tritium is called.

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Proton

Triton

Deuleron

Positron

Which of the following atom pair have the same structure.

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N, C

B, Li

H2 , Ne

Li , Na

The most readily fissionable isotope of uranium has atomic mass of

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234

235

236

238

The mass of an helium nucleus is equal to.

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2.0015 u

3.0015 u

4.0015 u

5.0015 u

The mass defect of Bohr's atomic model is

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Exclusion of nuclear motion

missing of classical and quantum theories

Failed to explain the fine structure of spectral line

All of the above

The Inner electrons in heavy atoms can be disturbed and dislodged by.

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X rays

Alpha particle

Beta particles

gama particles

The relationship between mass number atomic number and neutron number is.

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A = Z + N

A = Z - N

Z = A + N

N = Z - A

Which Isotopes is use din radioactive dating.

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C¹²

C¹³

C¹⁴

C¹⁶

Current gain of a CE amplifier is 50, ITS hfe is about

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25

50

75

100

The value of principal quantum number for an ionized atom is.

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13.6 eV

27.2 eV

54.4 eV

100 eV

x-rays cannot produce

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Photoelectron

Compton electron

Electron positron pair

All of these

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PPSC Physics Chapter 7 Modern Physics MCQs With Answers

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