PPSC Physics Topic 7 Modern Physics

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

One becquerel is equal to

Question # 2

The bunding energy per nucleon for iron is.

Question # 3

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 # 4

The constant lamda is called the.

Question # 5

The working of cloud chamber is based in the presence of.

Question # 6

The loss of mass in a.m.u in a nuclear change can be calculated from energy involved in MeV by

Question # 7

Which of the following radiations will burn human skin

Question # 8

The advantage of electron tube over a transistor is.

Question # 9

The rest mass of a particle is independent of the

Question # 10

The emission of photons by a metal when electrons are incident is called.

Question # 11

The exitance of more than one distinct state with the same energy is called.

Question # 12

In a nuclear reactor chani reaction is controlled by introducing.

Question # 13

Nuclear force exists between

Question # 14

The resistance between(+) and (-) inputs of an amplifier is.

Question # 15

An operational amplifiers will act as an inverting amplifier when the input signal is connected to.

Question # 16

The SI unit of current gain is.

Question # 17

Which of the following atom pair have the same structure.

Question # 18

The mass of an helium nucleus is equal to.

Question # 19

X-ray are

Question # 20

The force that bonds protons and neutrons together int he nucleus despite the electrical repulsion of the protons is called.

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PPSC Physics Chapter 7 Important MCQ's

Sr.# Question Answer
1 In heavy elements of the periodic table the number of neutrons than protons are.
A. Lesser
B. Greater
C. Equal
D. Undetermined
2 A newly prepared radioactive nuclide has a decay constant Lamda of 10-6 s-1 What is the approximate half life of the nuclide.
A. 1 hour
B. 1 day
C. 1 week
D. 1 month
3 A slow neutron can cause fission in
A. Uranium -238
B. Uranium-235
C. Hydrogen-1
D. Thorium -232
4 At high temperature a body generally emits redactions of.
A. Small wavelengths
B. Long wavelengths
C. Moderates wavelengths
D. Zero wavelengths
5 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
6 Photocells are used for
A. Security systems
B. Counting systems
C. Automatic door system
D. All of the above
7 Transistor are made from
A. Plastics
B. Metals
C. Insulators
D. Doped semiconductors
8 The input exultation for a JFET is
A. Current signal
B. Voltage signal
C. Voltage and current signals
D. Neither voltage nor current signal
9 X-rays are not used in RADARs because
A. They are not reflected by the target
B. they are not completely absorbed by air
C. They damage the target
D. They are reflected by the target
10 The half life of radium -226 is
A. 1620 years
B. 45 x 109 years
C. 3.8 days
D. 23.5 minutes

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