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Chapter:

30+ Radioactivity Solved MCQs

in A Level Physics

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Uncategorized topics .

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Chapter: Radioactivity
1.

Radius of nucleus ranges from {{}}

A. 10-15 m
B. 10-15 m to 10-14 m
C. 10-10 m
D. 10-10 m to 10-6 m
Answer» B. 10-15 m to 10-14 m
discuss
2.

Number of protons in an atom determine

A. chemical properties
B. physical properties
C. magnetic properties
D. electrical properties
Answer» A. chemical properties
discuss
3.

In β+ decay, an UP quark becomes

A. a strange quark
B. a simple quark
C. a down quark
D. an anti-quark
Answer» C. a down quark
discuss
4.

Most of the space in an atom is

A. filled with positive charge
B. empty
C. filled with negative charge
D. filled with neutrons
Answer» B. empty
discuss
5.

A proton is made up of

A. one up quark and two down quarks
B. an up quark and down antiquark
C. two up quarks and a down quark
D. strange quark and an anti-strange quark
Answer» C. two up quarks and a down quark
discuss
6.

Neutrinos have electric charge of

A. zero
B. 1
C. 2
D. 3
Answer» A. zero
discuss
7.

β-radiations are simply {{}}

A. protons
B. neutrons
C. electrons
D. muons
Answer» C. electrons
discuss
8.

In a nuclear process, the quantity conserved is

A. mass-energy
B. momentum
C. mass only
D. energy only
Answer» A. mass-energy
discuss
9.

A specific combination of protons and neutrons in a nucleus is called

A. nucleons
B. nuclide
C. neutrino
D. nucleolus
Answer» B. nuclide
discuss
10.

In β + decay, the nucleon number is

A. conserved
B. not conserved
C. unstable
D. stable
Answer» A. conserved
discuss
11.

Particles that are un affected by strong nuclear force are

A. protons
B. leptons
C. neutrons
D. bosons
Answer» B. leptons
discuss
12.

Number of isotopes neon has is

A. 2
B. 4
C. 3
D. 5
Answer» C. 3
discuss
13.

Phenomena of radioactivity was discovered by Henri Becquerel in

A. 1896
B. 1895
C. 1894
D. 1893
Answer» A. 1896
discuss
14.

Radiations emitted by radioactive substances is

A. alpha
B. beta
C. gamma
D. all of above
Answer» D. all of above
discuss
15.

Elements undergo radioactive decay when proton number becomes greater than

A. 50
B. 40
C. 83
D. 73
Answer» C. 83
discuss
16.

Process in which α and β rays pass close to atoms and knock electrons out is called

A. atomization
B. ionization
C. decay
D. hydroxylation
Answer» B. ionization
discuss
17.

Alpha particles have relatively

A. low kinetic energies
B. high potential energy
C. high mechanical energy
D. high kinetic energy
Answer» D. high kinetic energy
discuss
18.

Strongest ionizing radiation is

A. Alpha
B. beta
C. gamma
D. x-rays
Answer» A. Alpha
discuss
19.

The nucleon number consists of

A. Number of electrons
B. Number of protons
C. Number of electrons and protons
D. Number of protons and neutrons
Answer» D. Number of protons and neutrons
discuss
20.

Gamma radiation is emitted in order to

A. excite the atom
B. release excess energy from atom
C. destabilize the atom
D. stabilize the atom
Answer» B. release excess energy from atom
discuss
21.

Electrons move around nucleus in form of

A. clouds
B. dust particles
C. steam
D. charge
Answer» A. clouds
discuss
22.

Particles like kaons and muons etc, were found out by

A. looking at cosmic rays
B. looking at particles in accelerators
C. looking closely at atom
D. both A and B
Answer» D. both A and B
discuss
23.

Type of rays that affect the nucleus are

A. alpha
B. beta
C. gamma
D. EM
Answer» A. alpha
discuss
24.

Force that acts on both quarks and leptons is

A. strong nuclear force
B. weak interaction
C. intermediate interaction
D. nuclear force
Answer» B. weak interaction
discuss
25.

Particles that experience strong force are

A. leptons
B. hadrons
C. both A and B
D. softons
Answer» B. hadrons
discuss
26.

Heavy nuclei have

A. more protons than neutrons
B. more electrons than neutrons
C. more neutrons than electrons
D. more neutrons than protons
Answer» D. more neutrons than protons
discuss
27.

The strong nuclear force acts over the distance

A. 10-13 m
B. 10-14 m
C. 10-15 m
D. 10-16 m
Answer» B. 10-14 m
discuss
28.

A decay in which a proton decays in to neutron and an electron neutrino is

A. β+ decay
B. β-
C. γ decay
D. α decay
Answer» B. β-
discuss
29.

Photon of electromagnetic radiation is

A. α ray
B. β ray
C. γ ray
D. x-ray
Answer» C. γ ray
discuss
30.

Mass of alpha particle is

A. 50 times the mass of electron
B. 100 times the mass of electron
C. 500 times the mass of electron
D. 1000 times the mass of electron
Answer» D. 1000 times the mass of electron
discuss
31.

Particle which explains about mass of matter is called

A. Higgs boson
B. protons
C. leptons
D. neutrons
Answer» A. Higgs boson
discuss
32.

Plum pudding model describes atom as

A. negative pudding with positive plums
B. negative pudding
C. positive pudding with negative plums
D. positive pudding only
Answer» C. positive pudding with negative plums
discuss
33.

Lepton among them are

A. electrons
B. neutrinos
C. protons
D. both A and B
Answer» D. both A and B
discuss
34.

Density of proton is equal to density of

A. electron
B. atom
C. neutron
D. neutrino
Answer» C. neutron
discuss

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