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.

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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

PPSC Physics Topic 7 Modern Physics

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Question # 1

Which of the following phenomenon is observed in obtaining an X ray photograph of our hand.

Question # 2

A factory buy 100 g of a radioactive chemical with a half life of 5 years which decays to a stable compound How much of the chemical will still be radioactive 10 years time.

Question # 3

Which one of the following is a neutron absorber

Question # 4

X-rays used for

Question # 5

If an object moves with velocity of light the apparent length of the object moving the direction of motion becomes.

Question # 6

Two electrons approach each other their relative velocity will be.

Question # 7

Which of the following phenomenon is explained by the tunnel efffect.

Question # 8

When using the formula E = h lambda what unit should energy have.

Question # 9

Compton scattering experiment seemed to indicate that radiation had

Question # 10

According to Max. Planck, energy is released or absorbed in discrete packets called.

Question # 11

Marie Curie and Pierre Curie discovered two new radioactive elements which are.

Question # 12

The phenomenon in which a photon of frequency 'f' is scattered by an electron and the scattered photon has frequency f <f is known as.

Question # 13

Particle which can be added to the nucleus of an atom with changing its chemical properties are called.

Question # 14

In a Nuclear reactor which material is often used as modeerator.

Question # 15

What is the effect of electric and magnetic fields on X-rays

Question # 16

X-rays are not used in RADARs because

Question # 17

The Beta particles move along.

Question # 18

Which given quantity remains the same in isotones.

Question # 19

Which of the following describes that the time interval between two events may be different in different of references

Question # 20

What are isotopes.

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PPSC Physics Chapter 7 Important MCQ's

Sr.# Question Answer
1 Which of the following describes that the time interval between two events may be different in different of references
A. Simullaneously
B. Time dilation
C. Length contraction
D. Mass variation
2 Mean life of a radioactive sample is 100 s its half life will be
A. 0.693 s
B.
1 s
C. 6.93 s
D. 69.3 s
3 The helium nucleus does not contain
A. Two electrons
B. Two neutrons
C. Two protons
D. Six nucleons
4 Lines of Balmer series are emitted by hydrogen atom when the electron jumps from
A. The first orbit to any other orbit
B. Higher orbits to second orbit
C. Higher orbits to first orbit
D. The third orbit to higher orbit
5 At high temperature a body generally emits redactions of.
A. Small wavelengths
B. Long wavelengths
C. Moderates wavelengths
D. Zero wavelengths
6 Which of the following propagates at the same speed as velocity of light.
A. Heat waves
B. Sound waves
C. Shock waves
D.
Beta particles
7 Work function is generally expressed in.
A. Electron volt
B. Joules
C. Newtons
D. Gauss
8 The X-rays coming from a X-rays tube
A. Is monochromatic
B. Has all wavelengths smaller than a certain maximum wavelength
C. Has all wavelengths greater than a certain maximum wavelength
D. has all wavelengths minimum than a certain maximum wavelength
9 When an object moves with a very high speed the length in the direction of motion.
A. Contracts
B. Expands
C. Remains the same
D. Becomes infinity
10 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

Test Questions