PPSC Physics Topic 7 MCQ Test With Answer

Prepare Modern Physics and all other important topics with PPSC Physics online test. Modern Physics is a term that is used to describe all the discoveries and observations that made physicists rethink their understanding of Physics in the 19th and 20th centuries. In this day and age, one can't study Physics without having a firm understanding of concepts of Modern Physics. That’s why seekers for PPSC Physics jobs need to understand the subject of Modern Physics. Examiners ask many questions from this topic in the PPSC Physics test.

To make the PPSC exam preparation easier for you, team IlmKiDunya.com has created the PPSC Physics online test portal. On this page, you can attempt the PPSC online test MCQs about Modern Physics. Many students complain that they don’t find information about the PPSC Physics exam preparation. We at IlmKiDunya.com bring PPSC online test to your fingertips so you can prepare quickly for the test.

MCQ's Test For PPSC Physics Topic 7 Modern Physics

Try The MCQ's Test For PPSC Physics Topic 7 Modern Physics

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PPSC Physics Topic 7 Modern Physics

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Question # 1

X-rays are not used in RADARs because

Question # 2

Half life of a radioactive elements 10 minutes If the initial cont. rate is 368 counts per minute for what time count rate reaches 32 counts per minute.

Question # 3

Alpha particles are

Question # 4

Which term given below refers to the concept moving clocks run slower than clocks at rest w.r.t an observer.

Question # 5

Which Isotopes is use din radioactive dating.

Question # 6

The total number nucleons in a nucleus are called.

Question # 7

The critical mass of a fission reaction is.

Question # 8

The half life of a radioactive substance depend on.

Question # 9

The advantage of electron tube over semiconductor is.

Question # 10

When light of particular frequency is allowed to fall upon a metal surface electrons are emitted from a these emitted electrons are called.

Question # 11

In a Geiger Marsden experiment why do the great majority of the Alpha particles pass straight through the metal foil.

Question # 12

Neither the position nor the momentum of a particle can be predicted with arbitrarily great precision is the statement of.

Question # 13

One rem is equal to.

Question # 14

Radius of the Bother's orbit is r the radius of second orbit will be.

Question # 15

When Be is bombarded by alpha particles, then we obtain

Question # 16

For the normal operation of transistor the emitter base junction is always.

Question # 17

The energy delivered to the tissue per unit mass is called the absorbed dose of.

Question # 18

The electron behave an waves because

Question # 19

Though the wavelength of X-rays is smaller than that of visible light yet the speed of X-rays in vacuum is.

Question # 20

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

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PPSC Physics Chapter 7 Important MCQ's

Sr.# Question Answer
1 The gama rays have
A. Thin tracks
B. Thick tracks
C. No definite tracks
D. Continuous tracks
2 In potential for the material of cathode pure metals are rarely used because of their
A. Low reflecting power
B. High reflecting power
C. Low resolving power
D. High resolving power
3 Critical mass is the minimum mass needed for
A. Fusion
B. H-Bomb
C. Chain reaction
D. Binding energy
4 What is the scale for measurement of Banbridge mass spectrograph.
A. Linear
B. Inverse
C. Exponential
D. Logarithmic
5 Which of the following is not a mode of radioactive decay
A. Nuclear fusion
B. Alpha decay
C. Electron capture
D. Positron emission
6 The SI unit of absorbed dose in.
A. Bel
B. Weber
C. Rem
D. Grey
7 What is the effect of electric and magnetic fields on X-rays
A. X-rays are deflected
B. X-rays are not deflected
C. X-rays are sometimes deflected and sometimes not
D. Nothing can be said
8 Why hydrogen atom does not emit x-rays.
A. its size is very small
B. It contains only single electron
C. In it energy levels are for apart
D. In it energy levels are close to each other
9 The mass of proton is equal to.
A. 1.673 x 10-27 kg
B. 1.673 x 1027 kg
C. 9.1 x 10-31 kg
D. 9.1 x 1031 kg
10 An increase in frequency above threshold frequency results in.
A. Increase in photo electric current
B. Increase in K.E. of electrons
C. Decrease in photoelectric current
D. Decreases in K.E. of electrons

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