Question 1

Any meson is a combination of:

Accepted Answer

A)  three quarks 
B)  two quarks and an antiquark 
C)  one quark and two antiquarks 
D)  one quark and one antiquark 
E)  two quarks 
A)  three quarks 
B)  two quarks and an antiquark 
C)  one quark and two antiquarks 
D)  one quark and one antiquark 
E)  two quarks

Question 2

Strangeness is conserved in:

Accepted Answer

A)  all particle decays 
B)  no particle decays 
C)  all weak particle decays 
D)  all strong particle decays 
E)  some strong particle decays 
A)  all particle decays 
B)  no particle decays 
C)  all weak particle decays 
D)  all strong particle decays 
E)  some strong particle decays

Question 3

An example of a boson is a:

Accepted Answer

A)  photon 
B)  electron 
C)  neutrino 
D)  proton 
E)  neutron 
A)  photon 
B)  electron 
C)  neutrino 
D)  proton 
E)  neutron

Question 4

Which of the following particles is stable?

Accepted Answer

A)  Neutron 
B)  Proton 
C)  Pion 
D)  Muon 
E)  Kaon 
A)  Neutron 
B)  Proton 
C)  Pion 
D)  Muon 
E)  Kaon

Question 5

A proton cannot decay into a neutron, a positron, and an electron neutrino. Which of the following conservation laws would be violated if it did?

Accepted Answer

A)  Charge 
B)  Linear momentum 
C)  Angular momentum 
D)  Energy 
E)  None of the above 
A)  Charge 
B)  Linear momentum 
C)  Angular momentum 
D)  Energy 
E)  None of the above

Question 6

In terms of quark content a beta decay can be written:

Accepted Answer

A)  udd $\rightarrow$uud + e- + 
B)  udd $\rightarrow$ udd + dd + $\nu$ 
C)  udd $\rightarrow$ udd + dd + e- 
D)  udd $\rightarrow$ uud + ud +$\nu$ 
E)  udd $\rightarrow$ uud + e+ + 
A)  udd $\rightarrow$uud + e- + 
B)  udd $\rightarrow$ udd + dd + $\nu$ 
C)  udd $\rightarrow$ udd + dd + e- 
D)  udd $\rightarrow$ uud + ud +$\nu$ 
E)  udd $\rightarrow$ uud + e+ +

Question 7

An example of a fermion is a:

Accepted Answer

A)  photon 
B)  pion 
C)  neutrino 
D)  kaon 
E)  none of these 
A)  photon 
B)  pion 
C)  neutrino 
D)  kaon 
E)  none of these

Question 8

The microwave background radiation is a result of the big bang. The big bang also resulted in a uniform distribution of background:

Accepted Answer

A)  electrons 
B)  quarks 
C)  gluons 
D)  neutrinos 
E)  atoms 
A)  electrons 
B)  quarks 
C)  gluons 
D)  neutrinos 
E)  atoms

Question 9

Dark matter is suspected to exist in the universe because:

Accepted Answer

A)  the night sky is dark between stars 
B)  the orbital period of stars in the outer parts of a galaxy is greater than the orbital period of stars near the galactic center 
C)  the orbital period of stars in the outer parts of a galaxy is less than the orbital period of stars near the galactic center 
D)  the orbital period of stars in the outer parts of a galaxy is about the same as the orbital period of stars near the galactic center 
E)  all galaxies have about the same mass 
A)  the night sky is dark between stars 
B)  the orbital period of stars in the outer parts of a galaxy is greater than the orbital period of stars near the galactic center 
C)  the orbital period of stars in the outer parts of a galaxy is less than the orbital period of stars near the galactic center 
D)  the orbital period of stars in the outer parts of a galaxy is about the same as the orbital period of stars near the galactic center 
E)  all galaxies have about the same mass

Question 10

Messenger particles of the strong interaction are called:

Accepted Answer

A)  gluons 
B)  photons 
C)  W and Z 
D)  gravitons 
E)  Higgs 
A)  gluons 
B)  photons 
C)  W and Z 
D)  gravitons 
E)  Higgs

Question 11

The up quark u has charge +2/3 and strangeness 0; the down quark d has charge -1/3 and strangeness 0; the strange quark s has charge -1/3 and strangeness -1. This means there can be no meson with:

Accepted Answer

A)  charge 0 and strangeness -1 
B)  charge -1 and strangeness -1 
C)  charge +1 and strangeness -1 
D)  charge -1 and strangeness +1 
E)  charge 0 and strangeness +1 
A)  charge 0 and strangeness -1 
B)  charge -1 and strangeness -1 
C)  charge +1 and strangeness -1 
D)  charge -1 and strangeness +1 
E)  charge 0 and strangeness +1

Question 12

What discovery in 1998 changed our understanding of the overall history of the universe?

Accepted Answer

A)  The universe is permeated with radiation at microwave frequencies. 
B)  The universe is expanding, and has been since the Big Bang. 
C)  The expansion of the universe is slowing, and will eventually reverse, ending in a Big Crunch. 
D)  The expansion of the universe is accelerating, due to an unknown cause known as dark energy. 
E)  Rotational measurements of our galaxy and others demonstrated the existence of dark matter. 
A)  The universe is permeated with radiation at microwave frequencies. 
B)  The universe is expanding, and has been since the Big Bang. 
C)  The expansion of the universe is slowing, and will eventually reverse, ending in a Big Crunch. 
D)  The expansion of the universe is accelerating, due to an unknown cause known as dark energy. 
E)  Rotational measurements of our galaxy and others demonstrated the existence of dark matter.

Question 13

Messenger particles of the electromagnetic interaction are called:

Accepted Answer

A)  gluons 
B)  photons 
C)  W and Z 
D)  gravitons 
E)  pions 
A)  gluons 
B)  photons 
C)  W and Z 
D)  gravitons 
E)  pions

Question 14

In order of increasing strength the four basic interactions are:

Accepted Answer

A)  gravitational, weak, electromagnetic, and strong 
B)  gravitational, electromagnetic, weak, and strong 
C)  weak, gravitational, electromagnetic, and strong 
D)  weak, electromagnetic, gravitational, and strong 
E)  strong, electromagnetic, weak, and gravitational 
A)  gravitational, weak, electromagnetic, and strong 
B)  gravitational, electromagnetic, weak, and strong 
C)  weak, gravitational, electromagnetic, and strong 
D)  weak, electromagnetic, gravitational, and strong 
E)  strong, electromagnetic, weak, and gravitational

Question 15

All leptons interact with each other via the:

Accepted Answer

A)  strong force 
B)  weak force 
C)  electromagnetic force 
D)  strange force 
E)  none of these 
A)  strong force 
B)  weak force 
C)  electromagnetic force 
D)  strange force 
E)  none of these

Question 16

Baryonic matter (protons and neutrons) comprises what fraction of the total energy of the universe?

Accepted Answer

A)  about 1% 
B)  about 4% 
C)  about 23% 
D)  about 73% 
E)  almost 100% 
A)  about 1% 
B)  about 4% 
C)  about 23% 
D)  about 73% 
E)  almost 100%

Question 17

A neutral lepton cannot decay into two neutrinos. Of the following conservation laws, which would be violated if it did?

Accepted Answer

A)  Energy 
B)  Baryon number 
C)  Linear Momentum 
D)  Angular momentum 
E)  None of the above 
A)  Energy 
B)  Baryon number 
C)  Linear Momentum 
D)  Angular momentum 
E)  None of the above

Question 18

All particles with spin angular momentum :

Accepted Answer

A)  interact via the strong force 
B)  travel at the speed of light 
C)  obey the Pauli exclusion principle 
D)  have non-zero rest mass 
E)  are charged 
A)  interact via the strong force 
B)  travel at the speed of light 
C)  obey the Pauli exclusion principle 
D)  have non-zero rest mass 
E)  are charged

Question 19

The up quark u has charge +2e/3 and strangeness 0; the down quark d has charge -e/3 and strangeness 0; the strange quark s has charge -e/3 and strangeness -1. This means there can be no baryon with:

Accepted Answer

A)  charge 0 and strangeness 0 
B)  charge -e and strangeness -1 
C)  charge +e and strangeness -1 
D)  charge +e and strangeness -2 
E)  charge 0 and strangeness -2 
A)  charge 0 and strangeness 0 
B)  charge -e and strangeness -1 
C)  charge +e and strangeness -1 
D)  charge +e and strangeness -2 
E)  charge 0 and strangeness -2

Question 20

Two particles interact to produce only photons, with the original particles disappearing. The particles must have been:

Accepted Answer

A)  mesons 
B)  strange particles 
C)  strongly interacting 
D)  leptons 
E)  a particle-antiparticle pair 
A)  mesons 
B)  strange particles 
C)  strongly interacting 
D)  leptons 
E)  a particle-antiparticle pair

Exam 44: Quarks, Leptons, and the Big Bang

Any meson is a combination of:

Strangeness is conserved in:

An example of a boson is a:

Which of the following particles is stable?

A proton cannot decay into a neutron, a positron, and an electron neutrino. Which of the following conservation laws would be violated if it did?

In terms of quark content a beta decay can be written:

An example of a fermion is a:

The microwave background radiation is a result of the big bang. The big bang also resulted in a uniform distribution of background:

Dark matter is suspected to exist in the universe because:

Messenger particles of the strong interaction are called:

The up quark u has charge +2/3 and strangeness 0; the down quark d has charge -1/3 and strangeness 0; the strange quark s has charge -1/3 and strangeness -1. This means there can be no meson with:

What discovery in 1998 changed our understanding of the overall history of the universe?

Messenger particles of the electromagnetic interaction are called:

In order of increasing strength the four basic interactions are:

All leptons interact with each other via the:

Baryonic matter (protons and neutrons) comprises what fraction of the total energy of the universe?

A neutral lepton cannot decay into two neutrinos. Of the following conservation laws, which would be violated if it did?

All particles with spin angular momentum :

The up quark u has charge +2e/3 and strangeness 0; the down quark d has charge -e/3 and strangeness 0; the strange quark s has charge -e/3 and strangeness -1. This means there can be no baryon with:

Two particles interact to produce only photons, with the original particles disappearing. The particles must have been:

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