Candidate Name Centre Number Candidate Number

ZIMBABWE SCHOOL EXAMINATIONS COUNCIL

General Certificate of Education Ordinary Level

PHYSICS 4023/2
PAPER 2 Theory

NOVEMBER 2020 SESSION 2 hours 15 minutes

Candidates answer on the question paper.

Additional materials:
Electronic calculator
Answer paper

Time 2 hours 15 minutes

INSTRUCTIONS TO CANDIDATES
Write your name, centre number and candidate number in the spaces at the top of this page
and on any separate answer paper used.
Section A
Answer all questions.
Write your answers in the spaces provided on the question paper.

Section B
Answer any three questions.
Write your answers on the separate answer paper provided.
At the end of the examination fasten the answer paper used securely to the question paper.

INFORMATION FOR CANDIDATES

The number of marks is given in brackets [ ] at the end of each question.
Candidates are reminded that all quantitative answers should include appropriate units.

This question paper consists of 16 printed pages.

Copyright: Zimbabwe School Examinations Council, N2020.

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Section A Pelf
Answer all questions. Buaalw,
u..

1 Table 1.1 is an incomplete table showing basic SI quantities, units and symbols.

Quantity Unit Symbol

Mass kg
Time · Second
Kelvin K

(a) Complete Table 1.1 .

Table 1.1

[3]
•
(b) A cuboid with dimensions 7 em, 6 em, 6 em has a mass of 500 g.
Calculate the density of the cuboid.

[2]

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2 (a) Fig. 2.1 shows a velocity-time graph for a moving body. For
Examiner
Usc

velocity
(m/ s)

time (s)

Fig. 2.1

(i) State what the gradient of the graph in Fig. 2.1 represents.

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ [!]

(ii) Using Fig. 2.1 state how distance covered is obtained.

_ _ _ __ _ __ _ _ _ _ _ _ _ _ _ _ [!]

(iii) The gradient of a graph can be classified as being positive, negative or

zero. State how the gradient of Fig. 2.1 can be classified.

--~--------------- [1]

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(b)
A body accelerates from rest and attains a velocity of20 m/s in 2 seconds. It Par
then maintains this velocity for another 4 seconds, 2 seconds later, it ~·.
u..
decelerates uniformly to rest.

Complete Fig. 2.2 to show this motion.

velocity (ntis)

time (s)
Fig. 2.2

[2]
3 (a) Define moment ofa force.

---------------[1]

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(b) Fig. 3.1 shows a spanner being used to tighten a nut. For
Examine
Use

450N

Fig. 3.1

Calculate the moment of the force shown in Fig. 3.1.

[2]

(c) State the principle of moments. •

--~----------------[2)

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4 (a) (i) State two laws of refraction. Par

llzlllliDe
u.

(ii) The diagram shows a ray of light moving in different media.

N
•
I
I

I
I

I
I

glass pristn
ray of
light
Fig. 4.1

Complete the path for the ray of light out of the glass prism in Fig.
4.1. [3]

(b) Explain why a straight drinking straw appears bent at the surface when
partially immersed in water.

--~-----------=-=----[2]

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5 (a) State the type of joint used in wooden roof trusses. For
Examiner'
Use
[1]

(b) List two factors that affect the strength of joints in wooden roof trusses.

(2]

(c) Suggest two disadvantages of using wooden roof trusses.

[2]

6 (a) Fig. 6.1 shows a system of pulleys used to lift a load of 500 N by an
effort of 200 N.

effort 200 N

Fig. 6.1

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(i) Determine the velocity ratio of the pulley system. Pa

Bll.lmi
u.

(ii) Suggest any two ways of improving the efficiency of the pulley
system.

(iii) Calculate the mechanical advantage of the pulley system.

[5]

7 (a) Explain what is meant by the tenn magnification.

[l]

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(b)
Fig. 7.1 shows an object, 0, placed in front of a human eye.
Par
Bxmdaer'l
U1e
lens

t
object

Fig. 7.1

(i) Complete Fig. 7.1 to show how a real image is formed on the retina.

(ii) The object is placed 4 em from the eye lens and the image is found to
be at 12 em from the lens.
Calculate the magnification ..

[5]

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8 (a) (i) State the unit for electromotive force.

(ii) A learner is provided with three identical 1.5 V cells.

Draw an arrangement of the cells to show how the learner can produce a
battery that supplies the

I. greatest e.m.f,

2. highest amount of current.

(iii) State one other advantage of arranging the cells as in (ii) 1.

_ __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ [5]

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Section B

Answer ally three questions from this section.

9 (a) Fig. 9.1 shows an arrang ement of how a certam

. form of energy 1s
. produced.

earths's
sur rae~

. pipe

X X cracb in
X X hot rocks

X. X
Fig. 9.1

(i) Name the form of energy produced in Fig. 9.1.

(ii) State a raw material being fed into the earth at A.

(iii) State any two uses of this form of energy.

(iv) Suggest, with a reason, a material used to make the pipes. [6]

(b) (i) Name the device used to store electrical energy from solar panels.

. (ii) State a way of safely disposing the energy storing device in b(i).

(iii) Name another household gadget that makes use of solar energy.

(iv) Suggest any two factors that hinder wide usage of solar panels.

Estimate the efficiency of solar panels. [6]

(v)

(c) (i) Define power and state its SI unit.

A car of mass 400 kg is going up an incline, moving at a constant

(ii)
speed of 10 ms- 1 against a frictional force of200 N as shown in Fig
9.2.

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Per
~··
u..

3m

4m
Fig. 9.2

When the car is at the top of the incline,

calculate the
(1) change in gravitational potential energy,

(2) work done against friction,

(3) power generated against friction . [8]

10 (a) (i) State any two properties of a gas.

(ii)

(iii)
Explain why the volume of a metal solid increases when heated.

Give any two reasons why solids have a definite shape. [6]
•
(b) (i) State a component of electromagnetic waves which is of use in a solar
water heater.

(ii) Give any two reasons for using copper pipes in a solar water heater.

(iii) State a reason for covering the copper pipes with a glass plate in a
solar water heater.

(iv) Suggest with a reason, the material used to make the storage tank of a
water heating system.
[6]
(c) (i) State any two practical situations which make use of the high specific
heatcapacity ofwater.

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(ii) Fig. 10.1 shows a set up used to determine the specific heat capacity
ofwater. ·

thennometer
1---_...to 12 V supply

1----40 W heater

beaker

Fig. 10.1

Water of mass I Kg at 20 °Cis heated to 26 °(j in 10 minutes.

1. Calculate the specific heat capacity of water.

2. State any two assumptions made in your calculation in (1).

3. Suggest one way of improving the experiment in Fig. 10.1. [8]

(a) (i) State the laws of reflection.

(ii) Fig. 11.1 shows an arrangement used to investigate the law of

reflection.

vertical
plane
mirror

Fig. 11.1

On Fig. 11.1 draw the reflected ray and mark the angle of reflection.

Fig 11.2 shows a periscope used to look through an object on the other
(iii)
side of a wall.
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min·or Par
J!um!Da''•
Ute
---<~-light
from
object

obsevcr wa ll

Fig. 11.2
,
On fig 11.2, complete the path taken by the ray of light from the
object to the observer. [6]

(b) Fig. 11.3 shows a camera.

t
object

film

Fig. 11.3

(i) Draw two rays from the top of the object to show how the image is
formed on the film mark and label the image on the film.

(ii) Apart from its size, state one other property of the image formed by
the lens.

(iii) Explain why, when taking photographs of distant objects, it may be

necessary to move the lens towards the film. [6]

(c) (i) . Complete Fig. 11.4 for the path taken by the ray of light incident on a
glass prism. · ·

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ray of
light

Fig. 11.4.

(ii) State one device that makes use of such a prism as in Fig. 11.4.

(iii) A driver may see a "pool of water" on the road before him on a hot
sunny day.
Describe briefly how the "pool of water" is formed on the road. [8]

(a) Fig. 12.1 shows a current carrying conductor.

pennanent
permanent magnet
magnet

~battery

Fig. 12.1

(i) State the direction of current along the wire.

(ii) Explain what happens to the wire when switch, S, is closed.
(iii) State and explain what will happen when the battery is replaced by an
AC current. [6]

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(b) (i) State any two factors that affect the magnitude of induced e.m.f. Par
Bumiua:•a
U11e
(ii) Fig. 12.2 shows an electromagnet.

Soft iron core

Ammeter

lfl ~ unP! _money clip~

4·IDOlu

variable resistor

(0-15 Q) Switch
Fig. 12.2

Using Fig. 12.2;

I. suggest two ways of increasing the number of money clips
attracted to the soft iron core,

2. suggest any material used to make money clips used in Fig. 12.2.

(iii) State any .three uses of an electromagnet. [8]

(i) Define half-life.

(ii) State any three uses of radioactive isotopes.

(iii) The initial mass of Uranium-236 is 300 g.

Calculate the number of half-lives in 72 days. [6]

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