Q#1
A neutron exerts a force on a proton which is(a) gravitational
(b) electromagnetic
(c) nuclear
(d) weak
Answer: (a) gravitational, (c) nuclear
Both have masses, so the gravitational force is exerted. When very close they will exert nuclear force. Without charge, they can not exert electromagnetic force and weak forces are experienced only inside protons and neutrons.
Q#2
A proton exerts a force on a proton which is
(a) gravitational (b) electromagnetic (c) nuclear (d) weak
Answer: (a) gravitational, (b) electromagnetic (c) nuclear
Both have positive charges so electromagnetic forces will also be there.
Q#3
Mark the correct statements:
(a) The nuclear force between two protons is always greater than the electromagnetic force between them.
(b) The electromagnetic force between two protons is always greater than the gravitational force between them.
(c) The gravitational force between two protons may be greater than the nuclear force between them.
(d) Electromagnetic force between two protons may be greater than the nuclear force acting between them.
Answer: (b), (c), (d)
Option (a) is not correct because the nuclear force is not always greater but only greater when very close like inside a nucleus.
Q#4
If all the matter were made of electrically neutral particles such as neutrons,
(a) there would be no force of friction
(b) there would be no tension in the strings
(c) it would not be possible to sit on a chair
(d) the earth could not move around the sun
Answer: (a), (b), (c)
Options (a), (b), (c) are due to electromagnetic forces but option (d) is due to the gravitational force which will be always there.
Q#5
Which of the following systems may be adequately described by classical physics?
(a) the motion of a cricket ball
(b) the motion of a dust particle
(c) a hydrogen atom
(d) a neutron changing to a proton
Answer: (a), (b)
Size of a hydrogen atom and neutron is much smaller than 10-6 m so the motion of these particles can not be described by classical physics.
Q#6
The two ends of a spring are displaced along the length of the spring. All displacements have equal magnitudes. In which case or cases the tension or compression in the spring will have a maximum magnitude?
(a) the right end is displaced towards the right and the left end toward left
(b) both ends are displaced towards the right
(c) both ends are displaced towards left
(d) the right end is displaced towards left and the left end toward the right
Answer: (a), (d)
In the cases of (b) and (c) there is no change in the length of the spring, so there will be no tension or compression.
Q#7
Action and reaction
(a) act on two different objects
(b) have equal magnitude
(c) have opposite directions
(d) have resultant zero
Answer: (a), (b), (c), (d)
Action and reaction are the pair of forces applied by two objects on each other, they are equal in magnitudes but opposite in directions so their sum is zero.
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