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

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PPSC Physics Topic 7 Modern Physics

00:00
Question # 1

In the Geiger Marsden experiment a narrow beam of alpha particles was fired at a thin piece of Gold foil in a vacuum Some of the particles were scattered though large angles The result of the experiment provided evidence for the existence of.

Question # 2

LASER is a device which can produce.

Question # 3

The SI unit of decay constant is.

Question # 4

The energy that must be added to separate the nucleus is called.

Question # 5

The potential due to which an electron is lifted from gerund state to excited state is.

Question # 6

During transition, atom cannot emit

Question # 7

The unit generally used for measuring astronomical distances is.

Question # 8

Which of the following is believed to be carrier o nuclear forces.

Question # 9

An active component of an electronic circuit consisting of a small block of semiconducting material to which at least three electrical contacts are made is known as.

Question # 10

The energy equivalent of 1 kg of matter a

Question # 11

The band width of an audio amplifier is.

Question # 12

If the base emitter junction is forward biased and base collector junction is reverse biased the BJT is in.

Question # 13

Which one of the following spectra series is in the ultraviolet region.

Question # 14

Transistors with various combinations are widely used as switches in.

Question # 15

Matter waves

Question # 16

The splitting of atomic energy levels and the associated spectrum lines when the atoms are placed in a magnetic field is called.

Question # 17

The continuous x rays spectrum is obtained due to

Question # 18

Which of the following radiations will burn human skin

Question # 19

The ionization potential of hydrogen atom is.

Question # 20

What is the basic advantage of class A operation of an amplifier.

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PPSC Physics Chapter 7 Important MCQ's

Sr.# Question Answer
1 In n-p-n transistor the current flows in the direction from
A. Emitter to base
B. emitter to collector
C. Base to emitter
D. Base to collector
2 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
3 In the experiment of photo electric effect the minimum frequency of photons at which electrons are emitted from a metal surface is called.
A. Critical frequency
B. Typical frequency
C. Threshold frequency
D. Surface frequency
4 Which of the following is the most massive particle.
A. Deuteron
B. Alpha particle
C. Neutron
D. positron
5 A freshly made sample of radioactive material gives a count rate of 8,000 counts per minute After twenty days it gives a count rate of 500 counts per minute What is the half life of the materials.
A. 5 days
B. 10 days
C. 40 days
D. 20 days
6 When light of particular frequency is allowed to fall upon a metal surface electrons are emitted from a these emitted electrons are called.
A. Photons
B. Holes
C. Quants
D. Photo electrons
7 In de Brogile model electron orbit must form
A. Spectrum
B. Wave packets
C. Franhoffer lines
D. Clouds
8 Nuclear force as compared to electrostatic force is.
A. Weaker and long range
B. Weaker and short range
C. Stronger and longer range
D. Stronger and short range
9 In a transistor which one is very thin.
A. Collector
B. Emitter
C. Base
D. Depletion region
10 Which of the following phenomenon cannot be understood by quantum theory.
A. Photo electric effect
B. Compton effect
C. X-Rays production
D. Interference

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