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ZIMSEC O Level · 4023/1 · N2023

Physics Paper 1 November 2023

Questions
36 of 40
Time allowed
60 min
Syllabus code
4023/1

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Questions
36
Pass mark
22
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Answer every question in the printed order, get marked at the end, then see the answers.

The questions

Question 1

Measurement
Which one is not a vector quantity?
  1. Apressure
  2. Bacceleration
  3. Cdisplacement
  4. Dmomentum

Question 2

Measurement

The diagram shows a micrometer screw gauge measuring the diameter of a wire.

What is the reading on the micrometer screw gauge?

  1. A2.10 mm
  2. B2.50 mm
  3. C2.79 mm
  4. D2.80 mm

Question 3

Kinematics

The diagram shows the speed time graph of an athlete during a race over 35 seconds.

The distance travelled by the athlete whilst increasing speed is

  1. A25 m.
  2. B50 m.
  3. C200 m.
  4. D275 m.

Question 6

Forces
Modern buses have luggage compartments near the base to
  1. Aincrease stability.
  2. Breduce the air resistance.
  3. Cimprove the grip on the tyres.
  4. Dincrease the driving force on the bus.

Question 7

Machines

The diagram shows a system of pulleys.

The velocity ratio of the pulley system is given by the number of

  1. Apulleys in the system.
  2. Bblocks in the system.
  3. Cstrings supporting the load.
  4. Dmasses making up the load.

Question 8

Machines
The ratio of the useful work output to the work input in a machine is a measure of the
  1. Aefficiency.
  2. Benergy.
  3. Cpower.
  4. Dforce.

Question 9

Moments
What is the minimum effort, E, required to raise a load of 200 kg on the crow bar?
  1. A40 N
  2. B80 N
  3. C100 N
  4. D400 N

Question 10

Electronics
The method which is ideal for joining very small electronic parts is
  1. Awelding.
  2. Bbrazing.
  3. Csoldering.
  4. Dgluing.

Question 11

Thermal physics
In a petrol engine, which statement is true for the power stroke?
  1. ABoth valves are open while the piston is moving upwards.
  2. BBoth valves are open while the piston is moving downwards.
  3. CBoth valves are always open.
  4. DBoth valves are always closed.

Question 13

Fuels
What is the reason for blending fuel in Zimbabwe?
  1. ATo improve efficiency of fuel.
  2. BTo remove toxic substances.
  3. CTo make it easy to transport.
  4. DTo reduce import costs on fuel.

Question 14

Dynamics

The diagram shows a body on a horizontal plane acted upon by two horizontal forces.

What is the acceleration of the body?

  1. A0.5 m/s2
  2. B4.0 m/s2
  3. C4.5 m/s2
  4. D5.0 m/s2

Question 15

Chemistry/environment
What is the best way of getting rid of used batteries?
  1. Aburning them
  2. Bburying them
  3. Cthrowing in bins
  4. Drecycling them

Question 16

Waves
Electromagnetic waves cannot be used for
  1. Acooking.
  2. Bcommunication.
  3. Cremote sensing.
  4. Dpower generation.

Question 17

Waves
The distance between two successive crests on a water wave is equal to
  1. Aλ/4
  2. Bλ/2
  3. C1λ
  4. D2λ

Question 18

Waves
What is the frequency of sound waves given that its speed in a certain medium is 340 m/s and its wavelength is 35 m?
  1. A97.1 Hz
  2. B9.71 Hz
  3. C1.19 Hz
  4. D0.01 Hz

Question 19

Light
Laws of reflection apply to a
  1. Amagnifying glass.
  2. Bmirror.
  3. Chuman eye.
  4. Dconverging lens.

Question 20

Thermal physics
Water droplets collect on a lid of a half filled container due to
  1. Aevaporation, diffusion and condensation.
  2. Bevaporation, diffusion and sublimation.
  3. Cmelting, diffusion and sublimation.
  4. Dmelting, diffusion and condensation.

Question 21

Kinetic theory
A gas at 130 °C has a volume of 40 cm3, at constant pressure. What is the temperature when the volume is 20 cm3?
  1. A65 K
  2. B202 K
  3. C260 K
  4. D806 K

Question 22

Thermal physics
Which one is a property of a good heat absorber?
  1. Ashiny white
  2. Bshiny black
  3. Cdull black
  4. Ddull white

Question 23

Thermal physics
Which statement does NOT describe a liquid in glass thermometer?
  1. AIt has a thick bulb.
  2. BIt has a thin capillary tube.
  3. CIt has an opaque liquid.
  4. DIt has a constriction.

Question 24

Electrostatics
Which diagram correctly shows electric field lines around a charged particle?
  1. AA
  2. BB
  3. CC
  4. DD

Question 25

Thermal physics
Latent heat of fusion is the amount of heat required to change a
  1. Asolid to liquid at any temperature.
  2. Bliquid to solid at any temperature.
  3. Csolid to liquid at constant temperature.
  4. Dliquid to solid at constant temperature.

Question 26

Kinetic theory

The diagram shows the path of a pollen grain suspended in water to demonstrate Brownian motion.

What evidence is provided by this observation?

  1. Apollen grain moves at constant speed.
  2. Bwater molecules moves randomly.
  3. Cpollen grain moves randomly.
  4. Dwater molecules are stationery.

Question 27

Electrostatics

The diagram shows spikes on a lightning conductor which protects a hut against lightning from a negatively charged cloud.

Which one is not a function of spikes?

  1. Aattract electrons
  2. Bcharge air molecules
  3. Cconcentrate charge
  4. Dredistribute lighting

Question 28

Current electricity
Which wire is most likely to have the highest resistance?
  1. Athick and short wire
  2. Bthick and long wire
  3. Cthin and short wire
  4. Dthin and long wire

Question 29

Current electricity
The correct unit of electromotive force (e.m.f) is the
  1. ANewton.
  2. BAmpere.
  3. CVolt.
  4. DCoulomb.

Question 30

Current electricity

The circuit shows a set up by a student to compare brightness of identical bulbs.

If bulb Y blows out,

  1. AX remains the same.
  2. BZ becomes dimmer.
  3. CX becomes dimmer.
  4. DZ remains the same.

Question 31

Current electricity
Which one is an advantage of high voltage transmission?
  1. ANo energy loss.
  2. BCheap to transmit.
  3. CThick cables are used.
  4. DEasy to transmit.

Question 32

Magnetism
What are the magnetic properties of iron?
  1. AIt is soft and difficult to demagnetize.
  2. BIt is soft and easily demagnetized.
  3. CIt is hard and difficult to demagnetize.
  4. DIt is hard and easily demagnetized.

Question 34

Electronics

The diagram shows a combination of logic gates in a circuit.

Which logic gate is represented by the circuit?

  1. AAND
  2. BNAND
  3. COR
  4. DNOR

Question 35

Current electricity
In an ideal transformer
  1. Athick coils are used.
  2. Benergy loss is minimised.
  3. Cenergy is changed from one form to another.
  4. Dpower in the primary coil equals power in the secondary coil.

Question 36

Electronics
Which statement about a diode is correct?
  1. AIt allows current to flow in the correct direction.
  2. BIt breaks the circuit to protect appliance.
  3. CIt returns any excess current to the earth.
  4. DIt uses up any excess current.

Question 37

Electronics
Which electronic component is used for smoothing in rectification?
  1. Acapacitor
  2. Bresistor
  3. Cdiode
  4. Drelay

Question 38

Radioactivity
The symbol A in the nuclide notation ^A_Z X represents
  1. Aelectron number.
  2. Bneutron number.
  3. Cproton number.
  4. Dmass number.

Question 39

Radioactivity
What occurs during radioactive decay of a nucleus?
  1. ANucleus absorbs another nucleus.
  2. BNucleus splits into two equal parts.
  3. CNucleus absorbs radiation.
  4. DNucleus emits radiation.

Question 40

Radioactivity

The graph shows the decay curve for a radioactive substance, radon-220.

What is the half-life of radon-220?

  1. A25 s
  2. B50 s
  3. C100 s
  4. D150 s

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