Explore topic-wise MCQs in Physics.

This section includes 60 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.

1.

?-particle ionizes an atom

A. Due to electrostatic force of attraction
B. Due to electrostatic force of repulsion
C. Due to direct collision
D. Due to gravitational force
Answer» C. Due to direct collision
2.

?-particles possess greater penetration power than that of ?-particles due to its

A. Smaller ionization power
B. Greater ionization power
C. Neither greater nor smaller ionization power
D. Same ionization power
Answer» B. Greater ionization power
3.

?-rays are electromagnetic waves like

A. Light waves
B. Heat waves
C. Micro waves
D. X-rays
Answer» E.
4.

A ?-particle in a single encounter

A. Loses a small fraction of its energy
B. Losses most of its energy
C. Loses no energy at all
D. Loses all of its energy
Answer» C. Loses no energy at all
5.

A ?-particle can produce fluorescence in

A. ZnS
B. Barium platinocyanide
C. Calcium tungstate
D. All of above
Answer» E.
6.

In liquid metal fast breeder reactor the type of uranium used is

A. 92U235
B. 92U238
C. 92U234
D. 92U239
Answer» C. 92U234
7.

A device for producing high velocity nuclei is

A. Cloud chamber
B. Linear accelerator
C. A mass spectrograph
D. Wilson cloud chamber
Answer» C. A mass spectrograph
8.

In nucleus of uranium the number of neutrons will be

A. 92
B. 235
C. 143
D. Different for different isotopes
Answer» E.
9.

Mass defect per nucleon is

A. Binding energy of nucleus
B. Packing fraction
C. Average energy of nucleus
D. All of above are one and same thing
Answer» C. Average energy of nucleus
10.

Mass of neutron is

A. 1.67 x 10-31 kg
B. 1.67 x 10-27 kg
C. 9.1 x 10-31 kg
D. 1.67 x 10-19 kg
Answer» C. 9.1 x 10-31 kg
11.

Neutron and proton are commonly known as

A. Nucleon
B. Meson
C. Boson
D. Quartz
Answer» B. Meson
12.

Nuclear forces exist between

A. Proton-proton
B. Proton-neutron
C. Neutron-neutron
D. All of the above
Answer» E.
13.

Nuclei having the same mass number but different atomic number are

A. Isotopes
B. Isobars
C. Isotones
D. Isomers
Answer» C. Isotones
14.

Pair production can take place only with

A. X-rays
B. ?-rays
C. UV-rays
D. IR-rays
Answer» C. UV-rays
15.

Pair production cannot take place in vacuum as

A. Mass is not conserved
B. Energy is not conserved
C. Momentum is not conserved
D. Charge is not conserved
Answer» D. Charge is not conserved
16.

Pair production takes place in the vicinity of a heavy nucleus so that

A. Net energy is conserved
B. Net charge is conserved
C. Net momentum is conserved
D. All of the above
Answer» E.
17.

Pair production cannot take place in vacuum as ________ is not conserved

A. Energy
B. Charge
C. Mass
D. Momentum
Answer» E.
18.

Radiations are used for the treatment of skin of a patient is

A. ?-rays
B. ?-rays
C. ?-rays
D. X-rays
Answer» C. ?-rays
19.

Radioactive decay obeys which one of the following law?

A. N=N?e-?t
B. N=N?e?t
C. N=N?e-?t/2
D. N?=N(1+e?t)
Answer» B. N=N?e?t
20.

Charge on ?-particle is

A. 1
B. -1
C. Plus two
D. -2
Answer» B. -1
21.

Charge on ?-particles is

A. Plus one
B. Plus two
C. Minus two
D. Minus one
Answer» C. Minus two
22.

Charge on an electron was determine by

A. Ampere
B. Maxwell
C. Millikan
D. Thomson
Answer» D. Thomson
23.

Charge on neutron is

A. Plus 1.6 x 10-19C
B. Zero
C. Minus 1.6 x 10-19C
D. No definite charge
Answer» C. Minus 1.6 x 10-19C
24.

Diameter of an atom is approximately

A. 10-12m
B. 10-11m
C. 10-10m
D. 10-14m
Answer» D. 10-14m
25.

During an encounter with an atom ?-particle knocks out

A. Protons
B. Electrons
C. Neutrons
D. Nothing
Answer» C. Neutrons
26.

During fission process a large amount of

A. Heat energy is released
B. Nuclear energy is released
C. Chemical energy is released
D. Light energy is released
Answer» C. Chemical energy is released
27.

During fusion of hydrogen into helium

A. Energy is absorbed
B. Energy is released
C. Mass is increased due to energy absorption
D. Mass is reduced due to energy released
Answer» C. Mass is increased due to energy absorption
28.

Electrons

A. Can exist inside the nucleus
B. Cannot exist inside the nucleus
C. Can exist both inside and outside the nucleus
D. Do not know
Answer» C. Can exist both inside and outside the nucleus
29.

Fission chain reaction in a nuclear reactor can be controlled by introducing

A. Iron rods
B. Graphite rods
C. Cadmium rods
D. Platinum rods
Answer» D. Platinum rods
30.

Energy liberated when one atom of U-235 undergoes fission reaction is

A. 200MeV
B. 40MeV
C. 30MeV
D. 20MeV
Answer» B. 40MeV
31.

For chain reaction to build up the size of the radioactive target should be

A. Greater than the critical size
B. Less than the critical size
C. Equal to the critical size
D. All of above can build up a change reaction
Answer» B. Less than the critical size
32.

Geiger counter is suitable for

A. Fast counting
B. Extremely fast counting
C. Slow counting
D. All situations
Answer» D. All situations
33.

Half life of radium is 1590 years. In how many years shall the earth loss all its radium due to radioactive decay?

A. 1590x106 years
B. 1590x1012 years
C. 1590x1024 years
D. Never
Answer» E.
34.

If one or more of the neutrons emitted during fission cab be used to build up further fission then the reaction is self sustained and is known as

A. Fission reaction
B. Fusion reaction
C. Chain reaction
D. Chemical reaction
Answer» D. Chemical reaction
35.

Radioactive materials can be identified by measuring their

A. Hardness
B. Density
C. Mass
D. Half life
Answer» E.
36.

A mass spectrograph (spectrometer) sorts out

A. Molecules
B. Ions
C. Elements
D. Isotopes
Answer» C. Elements
37.

A particle having the mass of an electron and the charge of a proton is called a

A. Antiproton
B. Positron
C. Gamma rays
D. Photon
Answer» C. Gamma rays
38.

Antimatter consists of

A. Antiproton
B. Antineutron
C. Positron
D. All of above
Answer» E.
39.

According to which one of following law the density of atom is uniform?

A. J.J.Thomson model
B. Rutherfords model
C. Bohrs model
D. All of above laws contradict the statement
Answer» B. Rutherfords model
40.

An ?-particle is emitted from 88Ra226. What is the mass and atomic number of the daughter nucleus?

A. 224 - 84
B. 220 - 80
C. 222 - 86
D. 226 - 87
Answer» D. 226 - 87
41.

Average distance covered by ?-particle in air before its ionizing power ceases is called its

A. Trajectory
B. Range
C. Firing level
D. Limit
Answer» C. Firing level
42.

Average energy required to remove one nucleon from the nucleus is called

A. Binding energy per nucleon
B. Energy of decay
C. Destruction energy
D. All of above
Answer» B. Energy of decay
43.

CFC is used in

A. Refrigeration
B. Aerosol spray
C. Plastic foam industry
D. All of above
Answer» E.
44.

Which of the following will be a better shield against ?-rays?

A. Ordinary water
B. Heavy water
C. Lead
D. Aluminum
Answer» D. Aluminum
45.

Which one of the following radiation possesses maximum penetrating power?

A. ?-rays
B. ?-rays
C. ?-rays
D. All have equal penetrating power
Answer» D. All have equal penetrating power
46.

Which one of the following radiations possesses maximum velocity?

A. ?-rays
B. ?-rays
C. ?-rays
D. All of above have same speed
Answer» D. All of above have same speed
47.

Why ?-rays are used to kill bacteria to sterilize surgical equipments etc?

A. Chargeless
B. Massless
C. Highly penetrating
D. All of above
Answer» D. All of above
48.

Radioactivity is a ______

(A) Spontaneous activity (B) Chemical property (C) Physical Property

A. A & B
B. B & C
C. C & A
D. A B & C
Answer» D. A B & C
49.

Sterilization of surgical instruments medical supplies and bandages can be done by exposing them to a beam of

A. ?-rays
B. ?-rays
C. ?-rays
D. B and c have equal antiseptic properties
Answer» D. B and c have equal antiseptic properties
50.

Strontium-90 is used as

A. ?-particle source
B. ?-particle source
C. ?-rays source
D. Neutron source
Answer» B. ?-particle source