ZIMBABWE SCHOOL EXAMINATIONS COUNCIL
**PHYSICS**
TIME 1 hour
INSTRUCTIONS TO CANDIDATES
Do not open this booklet until you are told to do so. Write your name, centre number and candidate number on the answer sheet in the spaces provided unless this has already been done for you.
There are forty questions in this paper. Answer all questions. For each question, there are four possible answers, \(\mathbf{A}, \mathbf{B}, \mathbf{C}\) and \(\mathbf{D}\). Choose the one you consider correct and record your choice in soft pencil on the separate answer sheet.
Read very carefully the instructions on the answer sheet.
INFORMATION FOR CANDIDATES
Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet.
**This question paper consists of 16 printed pages.** Copyright: Zimbabwe School Examinations Council, N2020
Question 1
Which is the SI unit of temperature?
A Degrees Fahrenheit
B Degrees Celsius
C Kelvin
D Degrees
Question 2
The derived unit of force is
A \(\mathrm{kgm}^{-1} \mathrm{~s}^{-1}\).
B \(\mathrm{kgms}^{-1}\).
C \(\mathrm{kgms}^{-2}\).
D \(\mathrm{kgm}^{-1} \mathrm{~s}^{-2}\).
Question 3
The diagram shows a speed-time graph for a car.
What is the total distance travelled by the car?
A 40 m
B 60 m
C 80 m
Question 4
Terminal velocity is the velocity of a falling object
A just after it falls.
B just before it comes to rest.
C when the forces acting on it are unbalanced.
D when the forces acting on it are in equilibrium.
Question 5
Free fall is the falling of an object when
A the only force acting on it is gravitational force.
B the resultant force acting on it is zero.
C the forces acting on it are in opposite directions.
D air resistance acts against its weight.
Question 6
What is the smallest and largest resultant force that can be produced by forces of 3 N and 4 N acting at the same point?
| | Smallest | Largest | | :--- | :--- | :--- | | A | 1 N | 5 N | | B | 1 N | 7 N | | C | 3 N | 5 N | | D | 3 N | 7 N |
Question 7
Which one states Newton's second law of motion?
A \(\quad \frac{\text { work done }}{\text { displacement }}\)
B \(\frac{\text { work done }}{\text { time }}\)
C mass \(x\) velocity
D mass × acceleration
Question 8
Momentum is the product of
A force and velocity.
B force and time.
C mass and speed.
D mass and velocity.
Question 9
The diagram shows an extension-force graph. Which point \(\mathbf{A}, \mathbf{B}, \mathbf{C}\) or \(\mathbf{D}\) marks the limit of proportionality?
Question 10
A force of 20 N on a spring produces an extension of 4 cm. What will be the extension if a force of 50 N is applied to the spring, when the limit of proportionality is not exceeded?
A 1.6 cm
B 2.5 cm
C 10.0 cm
D 12.5 cm
Question 11
Which statement best describes frictional force?
A Opposes motion and increases effort needed to move the object.
B Opposes motion and decreases effort needed to move the object.
C Opposes motion and increases weight of object.
D Opposes motion and decreases weight of object.
Question 12
Which statement describes circular motion?
A The object's speed changes.
B The object's velocity does not change.
C The force on the object is towards the centre of the circle.
D The acceleration of the object is directed away from the centre of the circle.
Question 13
Which statement is NOT correct about pressure?
A A fluid exerts equal pressure in all directions at the same height.
B To withstand liquid pressure, dams are built thicker at the bottom.
C Atmospheric pressure decreases with increase in height.
D Water in a cup does not exert any pressure on the cup.
Question 14
Increasing the distance of the effort from pivot on a lever increases
A effort.
B velocity ratio.
C mechanical advantage.
D friction on pivot.
Question 15
The mechanical advantage of a single movable pulley is
A 1.
B 2.
C 3.
D 4.
Question 16
Which formula is used to calculate efficiency?
A \(\frac{\text { distance moved by effort }}{\text { distance moved by load }} \times 100 \%\)
B \(\frac{\text { velocity ratio }}{\text { mechanical advantage }} \times 100 \%\)
C \(\frac{\text { energy output }}{\text { energy input }} \times 100 \%\)
D \(\frac{\text { work input }}{\text { work output }} \times 100 \%\)
Question 17
What energy changes take place when a dart player throws a dart to the moment it hits the target?
A elastic ⟶ kinetic ⟶ potential
B kinetic ⟶ elastic ⟶ kinetic
C potential ⟶ chemical ⟶ kinetic
D chemical ⟶ kinetic ⟶ potential
Question 18
A block of mass 4 kg slides down a frictionless slope as shown in the diagram.
What is the change in gravitational potential energy?
A 80 J
B 200 J
C 400 J
D 800 J
Question 19
What is the power of an electric motor that lifts a weight of 200 N to a height of 20 m in 10 seconds?
A 20 W
B 100 W
C 400 W
D 40000 W
Question 20
A rock of mass 3.0 kg falls from a cliff 20 m high. What is its kinetic energy on hitting the ground?
A 30 J
B 60 J
C 200 J
D 600 J
Question 21
Which thermometer is suitable for measuring temperature at a point?
A thermocouple
B constant-gas volume
C platinum resistance
D liquid in glass
Question 22
Which graph describes Charles' law for a fixed mass of gas at constant pressure?
A
B
C
D
Question 23
Which part, A, B, C or D on the heating curve of water represents boiling?
Question 24
Which expression gives the amount of heat evolved when water of mass, \(m\), at temperature, \(\theta\), is frozen to ice at \(0^{\circ} \mathrm{C}\)? [Let specific heat capacity of water be c and latent heat of fusion of ice be \(l_{f}\)]
A \(\mathrm{m} l_{f}\)
B \(\mathrm{mc} \Delta \theta\)
C \(\mathrm{m} l_{f}+\mathrm{mc} \Delta \theta\)
D \(\mathrm{mc}+\mathrm{m} l_{\mathrm{f}} \Delta \theta\)
Question 25
Which process occurs at the surface of a liquid only?
A boiling
B freezing
C evaporation
D condensation
Question 26
What is the purpose of the curved dish on a solar cooker?
A To trap more heat.
B To focus reflected heat.
C To reduce reflection of heat.
D To disperse reflected heat.
Question 27
Which statement is correct for a water wave passing normally from shallow to deep region?
A Angle of refraction increases.
B Frequency of the wave increases.
C Wavelength of the wave decreases.
D Speed of the wave increases.
Question 28
Which statement is correct for a ray of light striking a glass-air boundary at \(90^{\circ}\)?
A It bends towards the normal.
B It bends away from the normal.
C It is refracted within the glass.
D It passes through undeflected.
Question 29
Which one is a property of electromagnetic waves?
A They are longitudinal in nature.
B They require a medium for propagation.