Explore topic-wise MCQs in Physics.

This section includes 145 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.

1.

The ratio of atomic volume to nuclear volume is of the order of

A. 10
B. 10
C. 10
D. 10
Answer» B. 10
Discussion
2.

The mass density of a nucleus varies with the mass number A as

A. A
B. A
C. 1 / A
D. A
Answer» E.
Discussion
3.

Which of the following statements are true ?
I . All radioactive elements decay exponentially with time
II . Half-life time of radioactive element is the time required for one half of the radioactive atoms to disintegrate
III . Age of the earth can be determined by radioactive dating
IV . Half-life time of a radioactive element is fifty percent of its average life period.
Select the correct answer using the codes given below

A. I and II
B. I, III and IV
C. I, II and III
D. II and III
Answer» D. II and III
Discussion
4.

Which of the following nuclei undergo fission when struck by thermal neutrons ?
1. U235
2. U238
3. Pu239
Select the correct answer using the codes given below

A. 1 and 2 only
B. 2 and 3 only
C. 1 and 3 only
D. 1, 2 and 3
Answer» D. 1, 2 and 3
Discussion
5.

X210 has half life of 5 days. The time taken for seven-eights of sample of X210 to decay is

A. 15 days
B. 20 days
C. 10 days
D. none
Answer» B. 20 days
Discussion
6.

The number of atoms of a radioactive substance at t = 0 is 8 x 104. Its half-life period is 4 years. The number of atoms left undecayed will be 1 x 104 after an interval of

A. 9 years
B. 12 years
C. 16 years
D. none
Answer» C. 16 years
Discussion
7.

Consider the following statements in a nuclear reactor, self sustained chain reaction is possible, because
1. More neutrons are related in each of the fission reaction
2. The neutrons immediately take part in the fission process
3. The fast neutrons are slowed down by graphite
4. Every neutron released in the fission reaction initiates fission.
Which of these statements are correct ?

A. 1, 2 and 3
B. 1 and 3
C. 2 and 4
D. 2, 3 and 4
Answer» B. 1 and 3
Discussion
8.

Consider the following statements
1. Atom bomb is based upon the principle of uncontrolled nuclear fusion
2. Hydrogen bomb is based upon the principle of uncontrolled nuclear fission
3. Nuclear reactor is based upon the principle of controlled nuclear fission
Which of the statements given above is / are correct ?

A. 3 only
B. 1 and 2 only
C. 2 and 3 only
D. 1, 2 and 3
Answer» B. 1 and 2 only
Discussion
9.

Fertile material among the following is

A. U
B. Pu
C. U
D. U
Answer» E.
Discussion
10.

The nuclear 6C13 and 7N14 can be described as

A. Isobars
B. Isotone
C. Isotopes of carbon
D. None of these
Answer» C. Isotopes of carbon
Discussion
11.

Consider the following statements
1. Plutonium - 239 can be made artificially
2. Boron is used in a nuclear reactor to absorbs unwanted neutrons
3. In nature, the availability of uranium - 238 is much more than that of uranium - 235.

A. 1 only
B. 1, 2
C. 1, 2, 3
D. 3 only
Answer» D. 3 only
Discussion
12.

In the following nuclear reaction
6C11 5B11 + + + X
What does X stand for ?

A. A neutron
B. A neutrino
C. An electron
D. A proton
Answer» C. An electron
Discussion
13.

Thermal neutrons can cause fission in

A. U
B. U
C. Pu
D. Th
Answer» B. U
Discussion
14.

Consider the following metals
1. Uranium
2. Radium
3. Plutonium
Which of these are used in making nuclear weapons ?

A. 1 and 2
B. 1, 2 and 3
C. 2 and 3
D. 1 and 3
Answer» E.
Discussion
15.

12 / 6C absorbs an energetic neutron and emits a - particle.
The resulting nucleus is

A. N
B. N
C. B
D. B
Answer» C. B
Discussion
16.

When 30 / 15 P decays to become 30 / 14 Si, the particle released is

A. Electron
B. a - particle
C. Neutron
D. Positron
Answer» E.
Discussion
17.

In the following nuclear reaction, 6 / 11 C 11 / 5 B + + X what does X stand for ?

A. A proton
B. A neutron
C. A neutrino
D. An electron
Answer» D. An electron
Discussion
18.

In any fission process. The ratio mass of fission products is mass of parent nucleus

A. Greater than 1
B. Equal to 1
C. Less than 1
D. Depends on the mass of the parent nucleus
Answer» D. Depends on the mass of the parent nucleus
Discussion
19.

Consider the following statements
1. According to de Broglie hypothesis particle have wave - like characteristics
2. When an electron and proton have the same de broglie wavelength, they will have equal momentum
Which of the statements given above is / are correct ?

A. 1 only
B. 2 only
C. Both 1, 2
D. Neither 1 nor 2
Answer» D. Neither 1 nor 2
Discussion
20.

Enriched uranium is better as a fuel for a nuclear reactor because it has greater proportion of

A. U
B. U
C. U
D. U
Answer» C. U
Discussion
21.

Electron beam therapy is a kind of radiation therapy to treat

A. enlarged prostate gland
B. gall bladder stones
C. certain types of cancer
D. kidney stones
Answer» D. kidney stones
Discussion
22.

Light year is

A. Light emitted by the sun in one year
B. Time taken by light to travel from sun to earth
C. The distance travelled by light in free space in one year
D. Time taken by earth to go once around the sun
Answer» D. Time taken by earth to go once around the sun
Discussion
23.

Match List - I (particle) with List - II (approximate rest energy in MeV) and select the correct answer using the codes gives the lists
List - I List - II
F Electron 0K1.940
G Neutrino2.140
H Neutron3.0.5
J Pi-Mason4.0
Codes :
F G H J
A. 2413
B. 3412
C. 3142
D. 2143
A. A.
B. B.
C. C.
D. D.
Answer» C. C.
Discussion
24.

The number of electrons in an atom of atomic number Z and mass number A is

A. Z
B. A
C. A - Z
D. none
Answer» B. A
Discussion
25.

Einstein got noble prize for

A. Photoelectric effect
B. Compton effect
C. Theory of relativity
D. None of these
Answer» B. Compton effect
Discussion
26.

Solar energy is produced by the following reaction

A. Fission reaction
B. Fusion reaction
C. Chemical reaction
D. None of these
Answer» C. Chemical reaction
Discussion
27.

The special technique used in ships to calculate the depth of ocean beds is

A. LASER
B. SONAR
C. sonic boom
D. reverberation
Answer» C. sonic boom
Discussion
28.

A man is sitting in a boat which is floating in pond. If the man drinks some water from the pond, the level of water in the pond will

A. rise a little
B. fall a little
C. remain stationary
D. None of these
Answer» D. None of these
Discussion
29.

Among the following radiations, which has the highest energy ?

A. Visible
B. X - ray
C. Ultraviolet
D. Infrared
Answer» C. Ultraviolet
Discussion
30.

Astronauts in space can't stand at one place, because

A. there is no gravity
B. viscous forces of the atmosphere are vary strong
C. solar wind exert an upward force
D. atmospheric pressure is very low
Answer» B. viscous forces of the atmosphere are vary strong
Discussion
31.

An egg when placed in ordinary water sinks but floats when placed in brine. This is because

A. density of brine is less than that of ordinary water
B. density of brine is equal to that of ordinary water
C. density of brine is greater than that of ordinary water
D. None of these
Answer» D. None of these
Discussion
32.

A body traveling with a speed of more than the velocity of sound in air is said to travel with

A. supersonic speed
B. hypersonic speed
C. ultrasonic speed
D. infrasonic speed
Answer» B. hypersonic speed
Discussion
33.

Radioactivity was discovered by

A. Rutherford
B. Henry Becquerel
C. Bohr
D. Madame Curie
Answer» C. Bohr
Discussion
34.

Photoelectric effect was discovered by

A. Hertz
B. Einstein
C. Plank
D. Bohr
Answer» C. Plank
Discussion
35.

Solar energy

A. Fission reaction
B. Fusion reaction
C. Chemical reaction
D. None of these
Answer» C. Chemical reaction
Discussion
36.

Einstein

A. Photoelectric effect
B. Compton effect
C. Theory of relativity
D. None of these
Answer» B. Compton effect
Discussion
37.

Astronauts

A. there is no gravity
B. viscous forces of the atmosphere are vary strong
C. solar wind exert an upward force
D. atmospheric pressure is very low
Answer» B. viscous forces of the atmosphere are vary strong
Discussion
38.

An egg

A. density of brine is less than that of ordinary water
B. density of brine is equal to that of ordinary water
C. density of brine is greater than that of ordinary water
D. None of these
Answer» D. None of these
Discussion
39.

A man is sitting in a boat which is

A. rise a little
B. fall a little
C. remain stationary
D. None of these
Answer» D. None of these
Discussion
40.

Match List - I (particle) with List - II (approximate rest energy in MeV) and select the correct answer using the codes gives the lists

A. A.
B. B.
C. C.
D. D.
Answer» C. C.
Discussion
41.

Radioactivity

A. Rutherford
B. Henry Becquerel
C. Bohr
D. Madame Curie
Answer» C. Bohr
Discussion
42.

Photoelectric effect

A. Hertz
B. Einstein
C. Plank
D. Bohr
Answer» C. Plank
Discussion
43.

Electron beam therapy

A. enlarged prostate gland
B. gall bladder stones
C. certain types of cancer
D. kidney stones
Answer» D. kidney stones
Discussion
44.

Food in the pressure cooked faster, as

A. the boiling points increases due to an increase in pressure
B. the boiling points decreases due to an increase in pressure
C. more steam is available at 100 C
D. more pressure is available at 100 C
Answer» B. the boiling points decreases due to an increase in pressure
Discussion
45.

Neutrino is a particle which

A. Has no charge but has spin
B. Is charged like electron and has spin
C. Has no charge and no spin
D. None of the above
Answer» B. Is charged like electron and has spin
Discussion
46.

The cathode ray particles originate in a discharge tube from the

A. Cathode
B. Anode
C. Source of high voltage
D. Residual gas
Answer» B. Anode
Discussion
47.

A photo sensitive material would emit electrons, if excited by photons beyond a threshold. To overcome the threshold, one would increase

A. The voltage applied to the light source
B. Intensity of light
C. The wavelength of light
D. The frequency of light
Answer» E.
Discussion
48.

Compton effect is associated with

A. Positive rays
B. - rays
C. y - rays
D. X - rays
Answer» E.
Discussion
49.

During a nuclear fusion reaction

A. A heavy nucleus breaks into two fragments by itself
B. A light nucleus bombarded by thermal neutrons breaks up
C. A heavy nucleus bombarded by thermal neutrons breaks up
D. Two light nuclei combine to give a heavier nucleus and possibly other products
Answer» E.
Discussion
50.

Pick out the statement which is true

A. The energy released per unit mass is more in fusion and that per atom in more in fission
B. Both fission and fusion produce same amount of energy per atom as well as per unit mass
C. The energy released per unit mass
D. The energy released per atom is more in fusion then in fission
Answer» B. Both fission and fusion produce same amount of energy per atom as well as per unit mass
Discussion