MULTIPLE-CHOICE QUESTIONS
Various options are provided as possible answers to the following questions. Choose the answer and write only the letter (A–D) next to the question number (1.1–1.10) in the ANSWER BOOK, for example 1.11 D.
1.1 The acceleration due to gravity on Earth is greater than that on the moon.
Which ONE of the following statements is CORRECT?
A The weight of an object on Earth is the same as that on the moon.
B The weight of an object on Earth is the same as that on the moon.
C The mass of an object on Earth is greater than that on the moon.
D The weight of an object on Earth is less than that on the moon. (2)
1.2 The force diagram below shows the forces acting on a box.
Which ONE of the following equations for the magnitude of the normal force (N) is CORRECT?
A N = w + Fcosθ
B N = w + Fsinθ
C N = w – Fcosθ
D N = w – Fsinθ (2)
1.2 The force diagram below shows the forces acting on a box.
Which ONE of the following equations for the magnitude of the normal force (N) is CORRECT?
A N = w + Fcosθ
B N = w + Fsinθ
C N = w – Fcosθ
D N = w – Fsinθ (2)
1.3 A stone is projected vertically upwards from the top of a building at a speed of v m∙s-1. The position-time graph below represents the motion of the stone. Ignore the effects of air resistance.
Which ONE of the combinations below regarding the magnitudes of the stone’s velocity and acceleration, at time t1, is CORRECT?
1.4 A trolley of mass m is moving at constant velocity v to the right on a frictionless horizontal surface. A ball of clay, also of mass m, dropped vertically, falls onto the trolley at time t, as shown in the diagram below.
The ball of clay sticks to the trolley.
Which ONE of the velocity-time graphs below CORRECTLY represents the velocity of the trolley before and after time t?
1.5 A person lifts a crate vertically upwards at constant velocity through a distance h. The person does work x on the crate in time t.
The person now lifts the same crate vertically upwards at constant velocity through the same distance, but in time 2t.
The work done by the person on the crate will now be …
A 1⁄2x
B x
C 2x
D 4x (2)
1.6 The wavelengths of light emitted by a distant star appear shorter when observed from Earth. From this we can conclude that the star is …
A moving towards Earth and the light is blue shifted.
B moving towards Earth and the light is red shifted.
C moving away from Earth and the light is red shifted.
D moving away from Earth and the light is blue shifted. (2)
1.7 Two identical light graphite-coated spheres, P1 and P2, are suspended using identical thin insulated threads. P1 is charged, but P2 is neutral. The spheres are then brought into contact with each other, as shown in diagram I.
Thereafter the spheres assume the positions, as shown in diagram II.
Which ONE of the following statements concerning the charges on the spheres possibly explains why the spheres move apart after touching, as shown in diagram II?
1.8 When a resistor of resistance R is connected to a battery of emf Ɛ and negligible internal resistance, the power dissipated in the resistor is P.
If the resistor is replaced with a resistor of resistance 2R, without changing the battery, the power dissipated will be …
A 1⁄4P
B 1⁄2P
C 2P
D 4P (2)
1.9 The diagram below shows a current-carrying conductor lying in a uniform
magnetic field directed to the right. The current flows into the page.
Which ONE of the following arrows shows the direction of the force experienced by the conductor due to the magnetic field?
1.10 Light of a certain frequency is shone onto a metal M and electrons are ejected from the surface. The same source of light is shone onto another metal N.
The electrons ejected from the surface of metal N have a much higher kinetic energy than that from metal M.
This means that …
A metal N has the same work function as metal M.
B metal N has a larger work function than metal M.
C the threshold frequency of metal N is higher than that of metal M.
D the threshold frequency of metal N is lower than that of metal M. (2)
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