talks about momentum and impulse,organic chemistry, doppler effect, acids and bases , electrodynamics and many more .See the preview and check the content page for more
CONTENTS
TOPIC 2: MOMENTUM AND IMPULSE 3
TOPIC 3: VERTICAL PROJECTILE MOTION IN ONE DIMENSION 12
TOPIC 4: ORGANIC CHEMISTRY 25
TOPIC 5: WORK, ENERGY AND POWER 34
TOPIC 6: DOPPLER EFFECT 45
TOPIC 7: RATE AND EXTENT OF REACTION 54
TOPIC 8: CHEMICAL EQUILIBRIUM 66
TOPIC 9: ACIDS AND BASES 77
TOPIC 10: ELECTRIC CIRCUITS 86
TOPIC 11: ELECTRODYNAMICS 101
TOPIC 12: OPTICAL PHENOMENA AND PROPERTIES OF MATTER 112
TOPIC 13: ELECTROCHEMISTRY 123
TOPIC 14: THE CHEMICAL INDUSTRY 134
2 Grade 12 PHYSICAL SCIENCES Assessment Booklet
, lOMoARcPSD|23479258
TOPIC 2: Momentum and Impulse
GRADE 12: QUESTIONS
MULTIPLE CHOICE QUESTIONS
1.1 According to Newton's Second Law of Motion, the acceleration of an object is …
A independent of its mass.
B always equal to its mass.
C directly proportional to its mass.
D inversely proportional to its mass. (2)
1.2 The magnitude of the impulse on a ball bouncing off a wall is equal to the ...
A net force of the ball on the wall.
B product of the net force on the ball and the time it acts.
C change in velocity of the ball.
D product of the mass and the acceleration of the ball. (2)
1.3 A person drops a glass bottle onto a concrete floor from a certain height and the bottle
breaks. The person then drops a second, identical glass bottle from the same height
onto a thick, woollen carpet, but the bottle does not break.
Which ONE of the following is CORRECT for the second bottle compared to the first
bottle for the same momentum change?
Average force on second bottle Time of contact with carpet
A Larger Smaller
B Smaller Smaller
C Larger Larger
D Smaller Larger
(2)
1.4 An object of mass m moving at velocity v collides head-on with an object of mass 2m
moving in the opposite direction at velocity v. Immediately after the collision the smaller
mass moves at velocity v in the opposite direction and the larger mass is brought to
rest. Refer to the diagram below.
Ignore the effects of friction. Which ONE of the following is CORRECT?
Momentum Mechanical energy
A Conserved Conserved
B Not conserved Conserved
C Conserve Not conserved
D Not conserved Not conserved
(2)
Grade 12 PHYSICAL SCIENCES Assessment Booklet 3
, lOMoARcPSD|23479258
TOPIC 2: Momentum and Impulse
1.5 If the momentum of an object is doubled, then its kinetic energy is ...
A halved
B doubled
C three times greater
D four times greater (2)
1.6 Two trolleys, P and Q, of mass m and 2m respectively are at rest on a frictionless
horizontal surface. The trolleys have a compressed spring between them.
The spring is released and the trolleys move apart. Which ONE of the following
statements is TRUE?
A P and Q have equal kinetic energies.
B The speed of P is less than the speed of Q.
C The sum of the final kinetic energies of P and Q is zero.
D The sum of the final momentum of P and Q is zero. (2)
1.7 Two trolleys, X and Y, are placed head to head with a compressed spring between
them. Trolley X has mass m, while trolley Y has mass 2m. The compressed spring is
released and the trolleys are shot apart.
y
x
m 2m
Immediately after the trolleys have been shot apart, trolley X moves with a speed v.
What will be the speed of trolley Y immediately after the trolleys are shot apart?
A ½v
B v
C 2v
D 4v (2)
1.8 Two friends, Peter and Lana, both on ice skates, are standing on the ice. Peter has
twice the mass of Lana. They press their hands together and push away from each
other.
Which ONE of the following is CORRECT regarding the magnitude of the firce exerted
by Peter on Lana?
A FPeter on Lana = 3FLana on Peter
B FPeter on Lana = 2FLana on Peter
C FPeter on Lana = FLana on Peter
1
D FPeter on Lana = 2 FLana on Peter (2)
4 Grade 12 PHYSICAL SCIENCES Assessment Booklet
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