Physics 11th Chap 14 : Topic 6 - Maryam Publications

Physics Chapter 14 : Topic 6

Quarks and Antiquarks

1 / 35

Quarks are considered to be:

A) Particles with no mass or charge

B) Composite particles made of protons

C) Fundamental particles that make up hadrons

D) Electromagnetic waves

2 / 35

The basic building blocks of protons and neutrons are:

A) Photons

B) Neutrinos

C) Electrons

D) Quarks

3 / 35

The number of known quark flavors (types) is:

A) Eight

B) Two

C) Four

D) Six

4 / 35

Which of the following is NOT a quark flavor?

A) Electron

B) Strange

C) Up

D) Charm

5 / 35

The six flavors of quarks are:

A) Up, down, strange, charm, top, bottom

B) Proton, neutron, electron, muon, tau, photon

C) Red, blue, green, yellow, black, white

D) Alpha, beta, gamma, neutrino, antineutrino, photon

6 / 35

The electric charge of an up quark is:

A) $\mathbf{+ \ 2/3\ e}$

B) $\mathbf{+ \ e}$

C) $\mathbf{- \ 1/3\ e}$

D) $\mathbf{- \ e}$

7 / 35

A quark is different from an electron because:

A) Quarks have no mass.

B) Electrons form protons.

C) Electrons are made of quarks.

D) Quarks have fractional electric charges.

8 / 35

The electric charge of a down quark is:

A) $\mathbf{+ \ 2/3\ e}$

B) $\mathbf{- \ 1/3\ e}$

C) $\mathbf{- \ e}$

D) $\mathbf{+ \ e}$

9 / 35

Which pair represents quarks with the same electric charge type?

A) Strange and charm

B) Top and bottom

C) Up and charm

D) Up and down

10 / 35

Which group contains only down-type quarks?

A) Up, charm, top

B) Down, strange, bottom

C) Up, strange, top

D) Charm, bottom, up

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An antiquark is:

A) The antimatter partner of a quark

B) A heavier form of quark only

C) A quark with the same charge

D) A particle without charge

12 / 35

The charge of an antiquark compared with its corresponding quark is:

A) Opposite

B) Double

C) The same

D) Always zero

13 / 35

The antiparticle of an up quark has charge:

A) $\mathbf{- \ 2/3\ e}$

B) $\mathbf{+ \ 2/3\ e}$

C) $\mathbf{+ \ 1/3\ e}$

D) $\mathbf{- \ e}$

14 / 35

The antiparticle of a down quark has charge:

A) $\mathbf{- \ 1/3\ e}$

B) $\mathbf{+ \ 2/3\ e}$

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

D) $\mathbf{+ \ 1/3\ e}$

15 / 35

Which particles are made of three quarks?

A) Photons

B) Mesons

C) Leptons

D) Baryons

16 / 35

A proton consists of:

A) Two up quarks and one down quark

B) Three up quarks

C) Three down quarks

D) One up quark and two down quarks

17 / 35

A neutron consists of:

A) Three strange quarks

B) Two charm quarks and one top quark

C) Two down quarks and one up quark

D) Three up quarks

18 / 35

The total charge of a proton can be calculated from its quarks as:

A) $\mathbf{( + \ 2/3\ e) + ( - \ 1/3\ e) = + \ e}$

B) $\mathbf{( + \ 2/3\ e) + ( + \ 2/3\ e) + ( - \ 1/3\ e) = + \ e}$

C) $\mathbf{( + \ 1/3\ e) + ( + \ 1/3\ e) + ( + \ 1/3\ e) = + \ e}$

D) $\mathbf{( - \ 2/3\ e) + ( - \ 2/3\ e) + ( + \ 1/3\ e) = - \ e}$

19 / 35

The total charge of a neutron is:

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

B) $\mathbf{- \ e}$

C) Zero

D) $\mathbf{+ \ e}$

20 / 35

Which of the following is a hadron?

A) Proton

B) Neutrino

C) Electron

D) Photon

21 / 35

Quarks are never normally observed individually because:

A) They have no charge.

B) They are confined inside composite particles.

C) They have infinite mass.

D) They do not interact.

22 / 35

Which fundamental interaction is mainly responsible for holding quarks together?

A) Gravitational force

B) Weak force

C) Electromagnetic force

D) Strong nuclear force

23 / 35

Which statement about quark mass is correct?

A) Different quark flavors have different masses.

B) Only up quarks have mass.

C) All quarks have identical masses.

D) Quarks have no mass.

24 / 35

The heaviest known quark is:

A) Strange

B) Down

C) Up

D) Top

25 / 35

Which quark has the smallest mass among the six flavors?

A) Charm

B) Up

C) Top

D) Bottom

26 / 35

Which particle combination forms a meson?

A) Proton and neutron

B) Three electrons

C) Three quarks

D) Quark and antiquark

27 / 35

Which statement correctly describes quarks and antiquarks?

A) They have no relation.

B) They have opposite charges.

C) They have the same charge.

D) They cannot interact.

28 / 35

A particle made from a quark and an antiquark is called:

A) Meson

B) Baryon

C) Lepton

D) Nucleus

29 / 35

Which of the following correctly pairs a quark with its antiquark?

A) Up and anti-up

B) Proton and neutron

C) Up and down

D) Charm and strange

30 / 35

A particle contains two up quarks and one down quark. It is:

A) Neutron

B) Proton

C) Meson

D) Electron

31 / 35

Which statement about quarks is correct?

A) They have only whole-number charges.

B) They are fundamental particles.

C) They are larger particles made from protons.

D) They are types of electromagnetic radiation.

32 / 35

The charge of a bottom quark is:

A) $\mathbf{- \ e}$

B) $\mathbf{+ \ e}$

C) $\mathbf{+ \ 2/3\ e}$

D) $\mathbf{- \ 1/3\ e}$

33 / 35

The charge of a charm quark is:

A) $\mathbf{+ \ 2/3\ e}$

B) $\mathbf{- \ 2/3\ e}$

C) $\mathbf{- \ 1/3\ e}$

D) Zero

34 / 35

Which set contains only up-type quarks?

A) Down, strange, bottom

B) Up, strange, bottom

C) Up, charm, top

D) Charm, strange, down

35 / 35

Which set contains only down-type quarks?

A) Up, strange, charm

B) Up, charm, top

C) Down, strange, bottom

D) Charm, bottom, top

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