Physics 11th Chap 14 : Topic 3 - Maryam Publications

Physics Chapter 14 : Topic 3

Antiparticles

1 / 30

An antiparticle is a particle that has:

A) Zero mass and opposite charge

B) Same mass and same charge as the corresponding particle

C) Same mass but opposite charge as the corresponding particle

D) Different mass and opposite charge as the corresponding particle

2 / 30

The antiparticle of an electron is:

A) Neutron

B) Proton

C) Positron

D) Photon

3 / 30

Which property of an electron and positron is the same?

A) Mass

B) Electric charge

C) Type of charge

D) Direction of spin

4 / 30

The charge of a positron is:

A) $\mathbf{- \ 1.6 \times}\mathbf{10}^{\mathbf{- 19}}\mathbf{\ C}$

B) Zero

C) $\mathbf{+ \ 3.2 \times}\mathbf{10}^{\mathbf{- 19}}\mathbf{\ C}$

D) $\mathbf{+ \ 1.6 \times}\mathbf{10}^{\mathbf{- 19}}\mathbf{\ C}$

5 / 30

Which statement correctly compares an electron and a positron?

A) Both have the same mass but opposite charges.

B) Electron is heavier than positron.

C) Both have opposite masses and same charge.

D) Positron is heavier than electron.

6 / 30

If an electron has charge $\mathbf{- \ e}$, the charge of its antiparticle will be:

A) $\mathbf{+ \ 2e}$

B) $\mathbf{- \ e}$

C) $\mathbf{+ \ e}$

D) $\mathbf{0}$

7 / 30

A particle and its antiparticle have:

A) Equal masses and equal charges

B) Different masses and equal charges

C) Different masses and opposite charges

D) Equal masses and opposite charges

8 / 30

The positron can be described as:

A) A positively charged proton

B) A positively charged electron

C) A photon with charge

D) A neutron with positive charge

9 / 30

The mass of a positron compared with an electron is:

A) Twice electron mass

B) Equal to electron mass

C) Zero

D) Half of electron mass

10 / 30

When an electron meets a positron, they may:

A) Repel permanently

B) Change into protons

C) Combine and produce energy

D) Become neutrons only

11 / 30

Which pair represents a particle and its antiparticle?

A) Neutron and proton

B) Photon and electron

C) Electron and positron

D) Electron and proton

12 / 30

The main difference between an electron and positron is their:

A) Size

B) Mass

C) Speed

D) Charge

13 / 30

If the electron has a mass of $\mathbf{9.11 \times}\mathbf{10}^{\mathbf{- 31}}\mathbf{\ kg}$, the mass of a positron is approximately:

A) $\mathbf{9.11 \times}\mathbf{10}^{\mathbf{- 31}}\mathbf{\ kg}$

B) $\mathbf{18.22 \times}\mathbf{10}^{\mathbf{- 31}}\mathbf{\ kg}$

C) $\mathbf{4.55 \times}\mathbf{10}^{\mathbf{- 31}}\mathbf{\ kg}$

D) $\mathbf{0\ kg}$

14 / 30

Which quantity is reversed when a particle changes into its antiparticle?

A) Charge

B) Mass

C) Energy

D) Velocity

15 / 30

A particle has the same mass as an electron but carries a positive charge. It is:

A) Alpha particle

B) Neutron

C) Proton

D) Positron

16 / 30

Which statement about antiparticles is NOT correct?

A) They always have zero charge.

B) They have opposite charges.

C) They have the same mass as their particles.

D) They can annihilate with their corresponding particles.

17 / 30

If a positron and an electron have equal masses, then their kinetic energies at the same speed are:

A) Equal

B) Opposite

C) Zero

D) Different because charges differ

18 / 30

The symbol of a positron is commonly written as:

A) $\mathbf{e}^{\mathbf{-}}$

B) $\mathbf{e}^{\mathbf{+}}$

C) $\mathbf{p}^{\mathbf{+}}$

D) $\mathbf{n}^{\mathbf{0}}$

19 / 30

A particle and its antiparticle can be distinguished mainly by comparing their:

A) Charge only

B) Size only

C) Charge and other quantum properties

D) Mass only

20 / 30

Which statement explains why a positron is not a proton?

A) A positron has no mass.

B) A positron has electron mass, not proton mass.

C) A positron is neutral.

D) A positron has no charge.

21 / 30

An electron and positron are released from rest in an electric field. They will:

A) Move in the same direction

B) Remain stationary

C) Move in opposite directions

D) Move only if they have different masses

22 / 30

Which pair has identical mass but opposite electric charge?

A) Proton and neutron

B) Photon and electron

C) Alpha particle and proton

D) Electron and positron

23 / 30

If the charge of an electron is represented by $\mathbf{- \ e}$, then the charge of a positron is:

A) $\mathbf{+ \ e}$

B) $\mathbf{- \ 2e}$

C) $\mathbf{+ \ 2e}$

D) $\mathbf{0}$

24 / 30

Antimatter differs from ordinary matter mainly because:

A) Its particles have opposite charges compared with matter particles.

B) It has no mass.

C) It cannot interact with matter.

D) It contains only neutrons.

25 / 30

Which observation provides evidence for the existence of positrons?

A) Absence of electric charge

B) Detection of particles with proton mass only

C) Detection of positively charged particles having electron mass

D) Decrease in electron mass

26 / 30

The rest mass of an antiparticle compared with its corresponding particle is:

A) Always smaller

B) Always zero

C) Always equal

D) Always greater

27 / 30

Which of the following correctly represents an electron-positron pair?

A) $\mathbf{e}^{\mathbf{-}}\mathbf{\ }$ and $\mathbf{\ e}^{\mathbf{+}}$

B) $\mathbf{n}^{\mathbf{o}}\mathbf{\ }$ and $\ \mathbf{\gamma}$

C) $\mathbf{p}^{\mathbf{+}}$ and $\ \mathbf{p}^{\mathbf{-}}$

D) $\mathbf{\alpha\ }$ and $\mathbf{\beta}^{\mathbf{-}}$

28 / 30

A positron has the same mass as an electron because:

A) They are particle-antiparticle partners.

B) Both have positive charges.

C) They contain protons.

D) Both are photons.

29 / 30

Which change occurs during electron-positron annihilation?

A) Charge is created.

B) Positron becomes neutral permanently.

C) Mass is converted into energy.

D) Electron becomes heavier.

30 / 30

A scientist discovers a particle with the same mass as an electron but charge $\mathbf{+ \ 1.6 \times}\mathbf{10}^{\mathbf{- 19}}\mathbf{\ C}$. The particle is most likely:

A) Alpha particle

B) Neutron

C) Proton

D) Positron

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