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ZIMSEC O Level · 4023/1 · N2021

Physics Paper 1 November 2021

Questions
40
Time allowed
60 min
Syllabus code
4023/1

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Questions
40
Pass mark
24
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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
What is the SI unit of length?
  1. Acentimetre
  2. Bmetre
  3. Ckilometre
  4. Dmillimetre

Question 2

Measurement
The diagram shows a micrometer screw gauge used to measure the diameter of a tungsten wire. What is the diameter of the tungsten wire?
  1. A3.50 mm
  2. B3.80 mm
  3. C3.32 mm
  4. D3.82 mm

Question 3

Kinematics
The diagram shows a tape from a ticker tape timer vibrating 50 dots per second. What is the average speed of motion?
  1. A0.32 m/s
  2. B0.33 m/s
  3. C2.00 m/s
  4. D3.00 m/s

Question 4

Forces
Which one is not true when a falling object speeds up?
  1. AAir resistance increases.
  2. BAcceleration of object is reduced.
  3. CAcceleration of object is increased.
  4. DAir resistance and weight of object are not equal.

Question 5

Momentum
An object of mass 0.20 kg moves with a uniform velocity of 2 m/s. What is its momentum?
  1. A0.04 kgm/s
  2. B0.10 kgm/s
  3. C0.40 kgm/s
  4. D4.00 kgm/s

Question 6

Forces
A longer spanner handle gives
  1. Aa smaller turning effect.
  2. Ba larger turning effect.
  3. Cless inertia.
  4. Dmore inertia.

Question 7

Kinematics
The diagram shows the velocity-time graph of a particle. What is the total time taken by the particle whilst in motion?
  1. A70 s
  2. B60 s
  3. C35 s
  4. D45 s

Question 8

Pressure
Pressure is force per unit
  1. Adensity.
  2. Bvolume.
  3. Cmass.
  4. Darea.

Question 9

Forces
Which quantity remains constant when an orange falls freely?
  1. Adisplacement
  2. Bacceleration
  3. Cvelocity
  4. Dspeed

Question 10

Forces
The diagrams show four different shaped toys, A, B, C and D, lying on the ground. Which toy is most likely to topple when slightly displaced?
  1. AA
  2. BB
  3. CC
  4. DD

Question 11

Machines
The diagram shows a crowbar being used to lift a load. The velocity ratio is
  1. A0.2.
  2. B0.8.
  3. C1.3.
  4. D5.0.

Question 12

Structures
Which one has the largest strength to mass ratio?
  1. AH shaped beam
  2. Btriangular hollow beam
  3. Crectangular hollow beam
  4. Dtruss

Question 13

Structures
Permanent joints in metals are achieved by using
  1. Ascrews.
  2. Bhinges.
  3. Crivets.
  4. Dbolts and nuts.

Question 14

Structures
The Kariba Dam is
  1. Aan earth dam.
  2. Ba concrete dam.
  3. Ca straight dam.
  4. Da gravity dam.

Question 15

Energy
The diagram shows a baboon of mass 56 kg at the base of a gentle slope and a lost lamb of mass 10 kg at a distance of 100 m away. The baboon runs towards the lamb. How much work does the baboon do to get to the lamb?
  1. A0.30 kJ
  2. B1.68 kJ
  3. C5.60 kJ
  4. D56 kJ

Question 16

Thermal physics
Which row is correct about the effect of impurities and pressure on the boiling point of water?
  1. Apressure increases the boiling point, impurities increase it
  2. Bpressure increases the boiling point, impurities decrease it
  3. Cpressure decreases the boiling point, impurities increase it
  4. Dpressure decreases the boiling point, impurities decrease it

Question 17

Thermal physics
The advantage of alcohol over mercury in a liquid in glass thermometer is that it
  1. Adoes not wet the glass.
  2. Bis a better conductor of heat.
  3. Cdoes not vaporise.
  4. Dhas a greater expansitivity.

Question 18

Thermal physics
Which physical property varies with temperature for a thermocouple thermometer?
  1. Apressure
  2. Bvolume
  3. Cvoltage
  4. Dlength

Question 19

Waves
What is the approximate range of audible frequencies for a human with normal hearing?
  1. A1 Hz to 20 Hz
  2. B20 Hz to 20 kHz
  3. C20 kHz to 200 kHz
  4. D100 kHz to 20 000 kHz

Question 20

Thermal physics
1 000 cm3 of gas at 20 degrees Celsius is heated to 90 degrees Celsius at constant pressure. What is the new volume of the gas?
  1. A222 cm3
  2. B807 cm3
  3. C4 500 cm3
  4. D1 239 cm3

Question 21

Thermal physics
The convection currents in a heated fluid is due to parts of the fluid having different
  1. Akinetic energies.
  2. Bpressures.
  3. Cdensities.
  4. Dmasses.

Question 22

Waves
The diagram shows a graph of the variation of pressure with distance at an instant along a sound wave. Which point, A, B, C or D, represents a rarefaction?
  1. AA
  2. BB
  3. CC
  4. DD

Question 23

Thermal physics
The diagram shows a heating curve of a solid. Which section A, B, C or D represents latent heat of fusion?
  1. AA
  2. BB
  3. CC
  4. DD

Question 24

Thermal physics
Drinks cooled in ice at 0 degrees Celsius were colder than those cooled in water at 0 degrees Celsius because
  1. Amelting ice temperature remains constant.
  2. Btemperature of water decreases.
  3. Cice melts quickly.
  4. Dwater evaporates slowly.

Question 25

Light
The splitting of visible light into its components is called
  1. Amagnification.
  2. Bdispersion.
  3. Creflection.
  4. Drefraction.

Question 26

Light
Which diagram, A, B, C, or D is correct for a light ray moving from glass to air when the angle of incidence is equal to the critical angle, c?
  1. AA
  2. BB
  3. CC
  4. DD

Question 27

Electrostatics
When a body is charged positively, it
  1. Agains electrons.
  2. Bloses electrons.
  3. Cgains positive charges.
  4. Dloses positive charges.

Question 28

Magnetism
A stronger magnet has
  1. Aa larger size.
  2. Bcloser field lines.
  3. Cmany poles.
  4. Da larger mass.

Question 29

Electrostatics
In an electric field, which of the following is incorrect?
  1. Aan electric charge experiences a force
  2. Bfield lines begin from positive and end on negative charges
  3. Cdirection of field lines give direction of force on a negative charge
  4. Delectrons are negative charges

Question 30

Magnetism
The diagram shows an electromagnet. What change can be made on the electromagnet to lift more paper clips?
  1. Aseparate the turns on the coil
  2. Buse a longer nail
  3. Cincrease the resistance on the variable resistor
  4. Dadd another cell in series

Question 31

Electronics
The diagram shows a combination of logic gates. Which single logic gate is equivalent to the combination shown?
  1. AAND
  2. BNAND
  3. COR
  4. DNOR

Question 32

Electricity
The main function of a transformer in a cellphone charger is to
  1. Adecrease charge.
  2. Bdecrease resistance.
  3. Cdecrease current.
  4. Ddecrease voltage.

Question 33

Magnetism
Which material is used for shielding sensitive electronic equipment against stray magnetic fields?
  1. Aaluminium
  2. Bcopper
  3. Cpolythene
  4. Dsoft iron

Question 34

Electronics
Which statement correctly describes how the resistance and voltage of an LDR vary with light intensity?
  1. AAs the light intensity increases, resistance decreases and voltage decreases.
  2. BAs the light intensity decreases, resistance decreases and voltage decreases.
  3. CAs the light intensity increases, resistance increases and voltage decreases.
  4. DAs the light intensity decreases, resistance decreases and voltage increases.

Question 35

Electronics
The diagram shows an electronic component. Which electronic component is shown in the diagram?
  1. ALED
  2. Breed switch
  3. Ctransformer
  4. Drelay

Question 36

Electricity
The advantage of high-voltage transmission is that
  1. Amore current is produced.
  2. Bpower loss is reduced.
  3. Cthicker cables can be used.
  4. Dit is fast.

Question 37

Electricity
In a circuit breaker, a coil is wound on a soft iron core to
  1. Aincrease the current flowing in the coil.
  2. Bincrease the strength of the magnetic field.
  3. Creduce the current flowing in the coil.
  4. Dreduce the strength of the magnetic field.

Question 38

Electronics
The table shows part of the colour code for resistors: figure 0 is black, 1 brown, 2 red, 3 orange, 4 yellow, 5 green, 6 blue and 7 violet. What is the colour code for a 27 kilohm resistor?
  1. Ared; violet; orange
  2. Bred; violet; black
  3. Corange; violet; red
  4. Dblack; violet; red

Question 39

Radioactivity
How many nucleons are in a uranium-235 atom, written as 235 over 92 U?
  1. A92
  2. B143
  3. C235
  4. D327

Question 40

Radioactivity
Which graph represents the decay process for a radioactive isotope?
  1. AA
  2. BB
  3. CC
  4. DD

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