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

  • Total Questions20

  • Time Allowed20

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PPSC Physics Topic 7 Modern Physics

00:00
Question # 1

The possible values of principal quantum number are.

Question # 2

The Compton effect in X-rays proves that

Question # 3

In a photocell, certain metals emit electrons for

Question # 4

In which of the following studies x-rays are not helpful.

Question # 5

The half life of isotopes X is four days and its initial mass is 32 mg What mass of the isotope X will remain after twelve days.

Question # 6

During the alpha decay process

Question # 7

48 days after the receipt the amount of iodine -131 left behind is only.

Question # 8

What are isotopes.

Question # 9

The radius of first Bohr's orbit for hydrogen atom is.

Question # 10

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

Question # 11

Cs - 137 is a radioisotope used ot determine the thickness of the walls of steel pipes Cs 137 is chosen because it emits

Question # 12

What is the energy equivalent to amu in Me V

Question # 13

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

Question # 14

From which radiation it is most difficult to protect oneslelf.

Question # 15

Which of the following configuration of BJTs gives both voltage gain and current gain.

Question # 16

The process by which nuclei emit a ,b and gama rays in order to attain stability is called.

Question # 17

Tracer techniques make use of.

Question # 18

Half life and mean lifetime of a radioactive element are.

Question # 19

Which of the following has the highest relative biological effectiveness or the quality factor.

Question # 20

The phenomenon is which the wavelength of scattered X-rays is larger than the incident X-rays is known as.

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PPSC Physics Chapter 7 Important MCQ's

Sr.# Question Answer
1 Photocells are used for
A. Security systems
B. Counting systems
C. Automatic door system
D. All of the above
2 The strength of photo electric current depends upon.
A. Intensity of incident light
B. Frequency of incident light
C. Angle of incident light
D. Distance between anode and cathode
3 How many terminals does a BJT have.
A. 1
B. 2
C. 3
D. 4
4 Which of the following phenomenon is explained by the tunnel efffect.
A. Alpha decay
B. Beta decay
C. Gama decay
D. Radioactivity
5 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
6 If the base emitter junction is forward biased and base collector junction is reverse biased the BJT is in.
A. cut of mode
B. Amplification mode
C. Saturation mode
D. Inversion mode
7 Current gain of a CE amplifier is 50, ITS hfe is about
A. 25
B. 50
C. 75
D. 100
8 The critical mass of fissionable uranium -235 can be reduced by
A. Adding impurities to it
B. Heating the material
C. surrounding it by neutron reflecting material
D. Surrounding it by neutron absorbing material
9 x-rays cannot produce
A. Photoelectron
B. Compton electron
C. Electron positron pair
D. All of these
10 The possible values of principal quantum number are.
A. only zero
B. 0,1,2,...................7
C. 1,2,3........................8
D. 2,3,4,6...............10

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