FBISE, NCP & NBF-aligned resources for Classes 9–12
Browse by Class
Browse by Type
Physics Chapter 14 : Test Yourself
Annihilation Reactions
1 / 12
Which fundamental conservation principle states that the total number of nucleons (protons and neutrons) remains constant in a closed system?
Reasoning: The law of conservation of nucleon number states that the total number of nucleons (protons + neutrons) remains constant in a nuclear reaction.
2 / 12
According to the principle of charge conservation, in any physical process, the total electric charge before and after the process must? (The options are wrong)
Reasoning: According to the law of conservation of charge, the total electric charge before and after any physical or nuclear process remains unchanged. The correct option should be "remains constant."
3 / 12
In a nuclear reaction, if a nucleus emits an alpha particle (helium nucleus), what happens to the nucleon number (A) of the original nucleus: (The options are wrong)
Reasoning: When an alpha $\mathbf{(\alpha)}$ particle is emitted, the nucleus loses 2 protons and 2 neutrons, so the nucleon number decreases by 4. None of the given options is correct.
4 / 12
During beta-minus $\mathbf{(}\mathbf{\beta\ }$-$\mathbf{)}$ decay, a neutron is transformed into a proton, emitting an electron (beta particle) in the process. What happens to the total charge during this decay, the total charge:
Reasoning: In $\mathbf{\beta}^{\mathbf{-}}$ decay, a neutron changes into a proton while emitting an electron. The increase of $\mathbf{+ 1}$ charge in the nucleus is balanced by the emitted electron $\mathbf{( - 1)}$, so the total charge remains conserved.
5 / 12
Positrons in our atmosphere can be produced during the natural process of?
Reasoning: High-energy processes such as lightning can produce positrons naturally in Earth's atmosphere through pair production.
6 / 12
Which type of carrier particle has not been found yet?
Reasoning: The graviton is the hypothetical carrier particle of gravity and has not yet been experimentally detected, whereas W and Z bosons have been discovered.
7 / 12
What type of hadron is always constructed partially of an anti-quark?
Reasoning: A meson is made of one quark and one antiquark, so it always contains an antiquark.
8 / 12
Analysis of which particles results into the search of Higgs boson?
Reasoning: The search for the Higgs boson involved studying the production and decay of W and Z bosons, among other particles.
9 / 12
Which device is used for proton decay?
Reasoning: Super-Kamiokande is a large underground detector used to search for proton decay and study neutrinos.
10 / 12
Lepton number for ‘delta’ particle is:
Reasoning: The Delta $\mathbf{(\Delta)}$ particle is a baryon, not a lepton. Therefore, its lepton number is 0.
11 / 12
Which particle has baryon number $\mathbf{+ 1}$?
Reasoning: The Omega $\mathbf{(\Omega)}$ particle is a baryon, so its baryon number is $\mathbf{+ 1}$. Muons and taus are leptons, while kaons are mesons.
12 / 12
The particle which has the color property is:
Reasoning: Gluons carry the color charge of the strong interaction and mediate the force between quarks.
Your score is
Restart quiz
