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 numbers (1.1 to 1.10) in
the ANSWER BOOK, e.g. 1.11 D.
1.1 Two forces, F1 and F2, act on a point. If F1 and F2 act in the same direction
the maximum resultant has a magnitude of 13 N. If forces F1 and F2 act in
opposite directions the magnitude of the minimum resultant is 3 N. The
magnitude of the two forces, in newton, is …
A)8 and 5.
B)16 and 10.
C)3 and 10.
D)10 and 7. (2)
1.2 A free-moving block slides down an inclined plane at a CONSTANT
VELOCITY. This means that the…
A)frictional force acting on the block is zero.
B)net force acting on the block is in the direction down the slope of the plane.
C)net force acting on the block is zero.
D)component of weight parallel to the plane is greater than the frictional force. (2)
1.3 A trolley is pushed along a horizontal surface with a force of 150 N at an
angle of 45º to the horizontal. The trolley experiences a constant frictional
force of 60 N.
The NET FORCE acting on the trolley:
(i) Causes the trolley to accelerate horizontally
(ii) Is equal to the applied force
(iii) Is horizontally forward
Which of the statements above are CORRECT?
A) (i) and (ii)
B) (ii) and (iii)
C) (i) and (iii)
D) (i), (ii) and (iii)
1.4 A man in a lift is moving upwards at a CONSTANT SPEED. The weight of the
man is W. According to Newton’s Third Law, the reaction force of the
weight W is the force of …
A)the floor on the man.
B)Earth on the man.
C)the man on the floor.
D)the man on Earth. (2)
1.5 The optical density of a medium …
A) will be high if the refraction of light is less.
B) is a measure of the refracting power of the medium.
C) is less when light bends towards the normal when entering the medium.
D) will be high if light moves faster through the medium. (2)
1.6 In which ONE of the graphs below will the gradient represent the refractive
index of a material when light passes from the air through the material?
1.7 Every point on a wave front acts as a point source of spherical, secondary
waves that move forward at the same speed as the wave. This statement
represents …
A)Snell’s law.
B)Huygens’ principle.
C)refraction.
D)the law of reflection. (2)
1.8 Three charges of magnitudes +2q, +2q and -2q are shown in the sketch
below.
Which arrow CORRECTLY indicates the direction of the NET FORCE acting
on the -2q charge?
1.9 Which ONE of the sketches below represents the CORRECT magnetic field
pattern around a straight current-carrying conductor?
1.10 Which ONE of the graphs below CORRECTLY represents the relationship
between potential difference and current in a non-ohmic resistor?
