2021_physics_olevel_nov_paper2

Extracted Content: 2021_physics_olevel_nov_paper2

Page 1

Extracted Text

Candidate Name Centre Number Candidate Number

ZIMBABWE SCHOOL EXAMINATIONS COUNCIL

General Certificate of Education Ordinary Level

4023/2

PHYSICS
PAPER 2 Theory

NOVEMBER 2021 SESSION 2 hours 15 minutes

Additional materials
Electronic calculator
Answer paper

Time 2 hours 15 minutes

INSTRUCTIONS TO CANDIDATES
Wnite 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.

Wnite 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 cach 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, N2021

© ZIMSEC W202) [Turn over

---

Page 2

Extracted Text

Candidate Name Centre Number Candidate Number

Co

2

Section A
Answer all questions.

1 (a) Fig. 1.1 shows how the measurement of length can be used to find the
thickness of a wire.

20 turns of closely wound wire
YVUVUUUUTUUUU

L=25mm

Aonon

| to

pencil

Fig. 1.1

Name the instrument used to measure length AB.

(b) Calculate the thickness of the wire in Fig, 1.1.

[2]

(c) State the precaution to be taken when winding the wire over the pencil.

---

Page 3

Extracted Text

@ Name the most suitable instrument for measuring the diameter of the wire.

: 0)

(a) Explain what is meant by transverse wave.

[1]

(b) State any two other similarities of electromagnetic waves.

_ — : _ [2]

(©) A radio wave has a speed of 3 x 198 m/s in air and its wavelength is 150 m.
Calculate its frequency.

[2]

---

Page 4

Extracted Text

Candidate Name

(a)

6)

@ @

beam.

Centre Number

Candidate Numbe,

TT Te

State a base quantity that is measured to determine the strength of

(i) = Name a property of beams that is used to name them.

(b) Fig. 3.1 shows a beam made by piling layers of wood.

—< ==}

cc |

| ———3

_ =
layers of
woud

0) Explain why the beam is easily sheared by a horizontal force.

Fig. 3.1

(ii) Add on Fig. 3.1 a beam that will make it resist shear.

(iii) | Explain why wood snaps when loaded.

State the value of the upper fixed point on a Celsius scale.

State any two physical properties which can be used for temperature

measurement.

4023/2 N2021

[2}

0)

Ui)

[1]

Ul]

(1)

0)

---

Page 5

Extracted Text

(c) State with a reason, a suitable thermometer for measuring the melting point of iron.

Type of
Thermometer

Reason [2

(a) (i) State the effect, on the resistance of a metallic conductor, of

doubling the length,

doubling the cross-sectional area,

increasing the temperature.

[3]

---

Page 6

Extracted Text

Candidate Name Centre Number Candidate Number

Sa a Pn ene

6

di) A copper cable of length 50 m and uniform cross-sectional area
1,26 x 19-5 m? is used during transmission of electricity.

Calculate the resistance of the cable given that the resistivity for copper|
1S 1.68 x 10-8Qm,

[2]
6 (a) Fig. 6.1 shows a conductor carrying a current into the paper.
lig. 6.1
On Fig. 6.1 draw the magnetic field around the wire. 2

4023/2 N2021

---

Page 7

Extracted Text

(b) Fig. 6.2 shows two hollow cylindrical tubes placed next to each other with insulated copper wires passing through the hollow tubes.

(ii)

high voltage battery Ss

insulated copper

hollow tube wire

high voltage battery

Fig. 6.2

State what is observed when switches S, and S; are closed.

Explain your observations in b (i).

[2]

---

Page 8

Extracted Text

Candidate Name Centre Number Candidate Numb,

a

8

7 (a) @ State the function of a capacitor.

(ii) ‘Fig. 7.1 shows an RC circuit.

A resistor

B voltmeter

a.c.
voltage “~~

Fig. 7.1

Name the components

4023/2 N2021

---

Page 9

Extracted Text

(@) Sketch a voltage-time graph of the output voltage across the resistor in Fig. 7.1 for two cycles.

[2]

(a) Fig. 8.1 shows a transformer.

1000 turns

(i) Identify part X.

(1)

(i) —— State, giving a reason, the type of transformer in Fig, 8.1.

7

---

Page 10

Extracted Text

Candidate Name Centre Number Candidate Number

CT

10

@) Calculate the output voltage of the transformer in Fig, 8.1.

---

Page 11

Extracted Text

Candidate Name

Centre Number Candidate Number

CO

9 (a)

@

Gi)
ii)
(iv)

11

Section B

Answer any three questions from this section.

Fig. 9.1 shows the moon orbiting the earth.

ae © moon
<h3 class="text-primary mt-4 mb-2">.</h3>
2 .
, .
* .
; .
, N
4 \
’ \
t ‘
! ‘
' \
' ‘
' '
1 1
1 '
\ 1
‘ t
‘ a
\ D
‘ ’
\ ’
, ‘
, ‘
‘ 4
N ’
. ’
. ,
. ,
. -
Se a
Fig. 9.1

On Fig. 9.1 draw an arrow that shows the direction of the force that
keeps the moon in orbit.

State the name of the force in a (i).
Explain why the force in a (i) does not do any work.

Predict what will happen to the moon, if the force was to do work.

(6]

---

Page 12

Extracted Text

12

(b) _‘ Fig, 9.2 shows an electric motor rated 6 500 W used to operate a lift of mass
500 kg that rises 11 m in 15 seconds.
[g = 10 ms”}.

electric motor

cable

lift

Vig, 9.2
(i) Calculate the tension in the cable.
(ii) Determine the power out of the electric motor.
Gi) Calculate the efficiency of the clectne motor.

(iv) Justify the efficiency found in b (iii).

[6|
(c) (i) Name two processes that gives out nuclear energy.
(ii) State any two uses of nuclear energy.
(iii) Suggest two dangers associated with nuclear energy.
(iv) Explain, giving two reasons, why most countnes in the world are
failing to make use of nuclear energy
(8

4022 N2021

---

Page 13

Extracted Text

13

0 @ @® State any two reasons why aeroplane bodies are made of aluminium
alloy.

(ii) Table 10.1 shows information about beams A, B and C produced whic!
sags after being loaded.

Table 10.1

From table 10.1, suggest with a reason. the strongest beam.

Gii) State two factors that should be kept constant tor the comparison
of the beams to be fair.

(b) Wind is blowing towards a wind turbine at 8 ms~*. The mass of air passing
through the area covered by wind turbine blades is 5000 kgs}.
(i) State the usetul energy conversions during operation of a wind
turbine.
(ii) Determine the kinetic energy of the air {lowing in one second.
(iii) ‘Ifthe turbine is 15% efficient, calculate the clectneal energy output.
(iv) State the reason why the turbine is not 100% eMicient.

(v) Suggest an environmental hazard passed by wind turbines.

Is)

---

Page 14

Extracted Text

¢ i _ . i i 13) a) State any two factors which determine the type of bridge to be constructed across a river.

(ii) Suggest why suspension bridges have a limited life span,

Git) Fig.10.1 show an incomplete suspension bridge,

pillar —

Vig. 10.1

On Fig. 10.1 make additions that will complete and strengthen the
bridge.

Using arrows, show the type of forces acting on pillars when the bridge
is loaded.

(iv) — State the function of rollers.
[8]

11 (a) Fig. 11.1 shows a component on a car engine.

to .
o-

throttle s

SS)
aaa |

jets

choke

Fig 11.1

4024/2 N2021

---

Page 15

Extracted Text

12

‘b)

(c)

(a)

@
Gi)
(iii)
Gv)

@
(ii)
ii)

0)
(ii)
(iii)

(iv)

jw

(ii)

Identify the component in Fig. 11.1.
State the functions of parts labelled X and Y.
Name a substance used in blending petrol in Zimbabwe.

Suggest any two reasons why countries are shifling from fossil fuels to
solar energy.

[6]

State what causes boiling point of water to vary with altitude.
Explain why sea water has a higher boiling point than pure water.

Describe how sound is produced when water boils.

[6]
Define heat capacity.
State two factors that determine the heat capacity of a substance.

An aluminium cup of mass 0.2 kg contains 0.4 kg of water at 90 °C.
Calculate the total amount of heat lost when the water and cup are
cooled to 15 C.

[specific heat capacity of water = 4 200 J/kg C]

[specific heat capacity of aluminium = 900 J/kg °C]

Explain why different materials have different heat capacities. [8]

Arrange x-rays, radio waves and micro waves in order of increasing
frequency.

State one use of
1. X-rays,
2. micro-waves,
3. intra-red,
4. ultraviolet. 6]

---

Page 16

Extracted Text

Centre Number Candidate Number

Candidate Name
16

@) a) Name any two household devices that make use of thermostats in
temperature control ,

(ii) Fig. 12.1 shows a fire alarm circuit.

alarny/buzzer

contact

heat source
Vig. 12.1

Describe how the circuit in Fig, 12.1 works.

Gii) — Explain what would happen if railway lines had no gaps along them.

[6]
(c) qd) Give any two ditterences between boiling and evaporation.

(ii) State Boyle's law.
Gii) A gas occupies 100 cm? at a pressure of 20 kPa and a temperature of

25°C.
Calculate the volume of gas when pressure of 20 kPa and temperature

are changed to 15 kPa and 15°C respectively.

(iv) — Explain why island heat faster than the sea, ,
[8]

A02M2 N2021

---