1.1 The rate of change of momentum of an object is equal to the …
A impulse on the object.
B net force acting on the object.
C product of the object’s mass and its change in velocity.
D product of the net force acting on the object and its acceleration. (2)
1.2 The gravitational acceleration on the surface of planet X with mass M and
radius r is g.
The gravitational acceleration on the surface of planet Y with mass 2M and
radius ½r is …
A ½g
B g
C 4g
D 8g (2)
1.3 The graph below shows how one of the physical quantities associated with an
object in free fall changes with time t. The label on the y-axis is omitted.
Ignore air friction.
Which ONE of the following physical quantities can be the label on the
y-axis?
A Velocity
B Position
C Weight
D Momentum (2)
1.4 A ball of mass m, falling vertically downwards, hits the floor at a speed v and
bounces vertically upwards at a speed 0,75v.
Which ONE of the following combinations regarding the change in momentum
of the ball during the collision is CORRECT?
1.5 The base SI unit of the physical quantity ‘work’ is …
A kg∙m∙s-1
B kg∙m2∙s2
C kg∙m2∙s-2
D kg∙m∙s-2
1.6 The siren of a police car, moving in front of a truck, emits sound waves of
frequency f. Both vehicles are travelling at the same constant velocity.
The frequency of the sound heard by the driver of the truck is …
A f.
B zero.
C greater than f.
D smaller than f. (2)
1.7 Two identical metal spheres, P and R, on insulated stands, carry different
charges. The spheres are brought into contact and then separated again.
If the charge on sphere R AFTER the separation is q, the charge on sphere P
after the separation is …
A q.
B zero.
C less than q.
D greater than q. (2)
1.8 An AC generator generates a current with a frequency of 50 Hz.
The number of times that the maximum (peak) current is produced in one
second is …
A 25.
B 50.
C 75.
D 100. (2)
1.9 In the circuit below, the battery has an internal resistance r and an emf . (symbol)
A variable resistor R is connected in the circuit and the ammeter and
voltmeter register readings.
The resistance of the variable resistor R is INCREASED now.
Which ONE of the following combinations is the CORRECT representation of
the change in the readings on the ammeter and voltmeter as the resistance
of R is increased?
1.10 The sodium cathode of a photocell is irradiated with ultraviolet light as shown
in the diagram below. The ammeter registers a current.
Which ONE of the following changes will INCREASE the ammeter reading?
A Use a thinner sodium cathode.
B Increase the intensity of the ultraviolet light.
C Increase the frequency of the ultraviolet light.
D Replace the sodium cathode with a cathode of lower work function. (2)
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