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ZIMSEC O Level · 4023/1 · N2019

Physics Paper 1 November 2019

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

Moments
Which one has the same unit as moment of a force?
  1. Aforce
  2. Bmomentum
  3. Cpower
  4. Dwork

Question 2

Measurement
What is the reading shown on the vernier callipers?
  1. A8.4 mm
  2. B8.6 mm
  3. C14.5 mm
  4. D15.0 mm

Question 3

Density
What is the density of a piece of metal which has a mass of 450 g and a volume of 48 cm3\mathrm{cm^3}?
  1. A0.1 g/cm3\mathrm{g/cm^3}
  2. B9.4 g/cm3\mathrm{g/cm^3}
  3. C402 g/cm3\mathrm{g/cm^3}
  4. D21 600 g/cm3\mathrm{g/cm^3}

Question 4

Motion

The graph shows the motion of a car from point A to C.

Which row best describes the motion of the car?

  1. AA-B uniform acceleration; B-C uniform velocity
  2. BA-B change in acceleration; B-C uniform acceleration
  3. CA-B uniform velocity; B-C uniform acceleration
  4. DA-B change in velocity; B-C uniform acceleration

Question 5

Motion
Which statement is correct for a rock falling freely?
  1. AAcceleration is constant.
  2. BAcceleration increases.
  3. CAcceleration decreases.
  4. DAcceleration is zero.

Question 6

Stability
Which changes result in an increase in the stability of an object?
  1. Aincreased base area and increased height of centre of gravity
  2. Bdecreased base area and increased height of centre of gravity
  3. Cincreased base area and decreased height of centre of gravity
  4. Ddecreased base area and decreased height of centre of gravity

Question 7

Forces
Inertia is
  1. Aresistance to change of state of motion.
  2. Bpressure due to change of motion.
  3. Ca force which opposes motion.
  4. Da force which causes motion.

Question 8

Moments

The diagram shows a uniform metre rule in equilibrium.

What is the value of X?

  1. A8 N
  2. B9 N
  3. C16 N
  4. D60 N

Question 9

Circular motion
Which statement is correct for a body moving in a circle at constant speed?
  1. AThere is no force acting on it.
  2. BThere is no force producing an acceleration.
  3. CThere is a force acting at a tangent to the circle.
  4. DThere is a force acting towards the centre of the circle.

Question 10

Machines

The diagram shows a pulley system.

What is the mechanical advantage of the pulley system?

  1. A0.067
  2. B0.670
  3. C1.50
  4. D15.00

Question 11

Work, energy and power
Which quantity is calculated by multiplying force and distance?
  1. Awork
  2. Bpower
  3. Cpressure
  4. Dmomentum

Question 12

Work, energy and power
Gravitational potential energy is transformed to kinetic energy when
  1. Aa car is travelling on a flat horizontal ground.
  2. Ba mango falls from a mango tree.
  3. Ca car is travelling up a hill.
  4. Dan object is thrown upwards.

Question 13

Work, energy and power
One watt is equivalent to one
  1. Avolt per second.
  2. Bjoule per second.
  3. Ccoulomb per second.
  4. Dampere per second.

Question 14

Energy sources
Which source of energy is renewable?
  1. Acoal
  2. Btides
  3. Cgenerators
  4. Dbatteries

Question 15

Structures
Which factor affects the strength of joints?
  1. Asize of load
  2. Bsize of contact area
  3. Csize of materials
  4. Dsize of dowels

Question 16

Engines
What causes the production of soot in a petrol engine?
  1. Ablocked jets
  2. Bworn-out jets
  3. Cworn out radiator
  4. Dblocked petrol filter

Question 17

Forces
A compressional force is a
  1. Arotational force.
  2. Bstretching force.
  3. Ccrushing force.
  4. Dtwisting force.

Question 18

Pressure

The diagram shows the effect of removing air from a can.

Why does the can crush?

  1. AThe pressure inside the can is greater than outside pressure.
  2. BThe pressure inside the can is equal to outside pressure.
  3. CThe pressure inside the can is less than outside pressure.
  4. DThe pressure inside the pump is equal to the outside pressure.

Question 19

Thermal physics
Which row shows what happens to the melting point of ice and the boiling point of water when the pressure is reduced?
  1. Amelting point increases; boiling point increases
  2. Bmelting point increases; boiling point decreases
  3. Cmelting point decreases; boiling point decreases
  4. Dmelting point decreases; boiling point increases

Question 20

Thermometers
Which statement best explains why water is not used in thermometers?
  1. AIt adheres to glass.
  2. BIt has a low heat capacity.
  3. CIt does not expand when heated.
  4. DIt has unusual behaviour.

Question 21

Thermal physics
What happens to the temperature of a substance during change of state?
  1. Ait increases
  2. Bit decreases
  3. Cit remains constant
  4. Dit fluctuates

Question 22

Sound
What increases the loudness of a sound note?
  1. Aincrease in frequency
  2. Bdecrease in frequency
  3. Cdecrease in amplitude
  4. Dincrease in amplitude

Question 23

Refraction

The diagram shows a ray of light travelling from air to glass.

Which ratio represents the refractive index of glass?

  1. APQ\dfrac{P}{Q}
  2. BQP\dfrac{Q}{P}
  3. Csin⁡Psin⁡Q\dfrac{\sin P}{\sin Q}
  4. Dsin⁡Qsin⁡P\dfrac{\sin Q}{\sin P}

Question 24

Electromagnetic spectrum
Which electromagnetic wave is used in data communication?
  1. AX-rays
  2. Binfra-red
  3. Cultra-violet
  4. Dmicrowave

Question 25

Dispersion

The diagram shows a ray of white light passing through a glass prism.

Which component of the light is refracted the most?

  1. Aviolet
  2. Bgreen
  3. Cblue
  4. Dred

Question 26

Cells and batteries
The depolariser used in a dry cell is
  1. Aammonium (II) chloride.
  2. Bmanganese (IV) oxide.
  3. Czinc (II) sulphate.
  4. Dzinc (II) chloride.

Question 27

Electrostatics

The diagram shows a charged rod brought close to a gold leaf electroscope.

The leaf diverges because

  1. Anegative charges move from the charged rod to the gold leaf.
  2. Bnegative charges are repelled from the metal cap to the gold leaf.
  3. Cpositive charges are attracted from the gold leaf to the metal cap.
  4. Dpositive charges are attracted from the gold leaf to the charged rod.

Question 28

Resistance

The diagram shows a network of resistors.

What is the effective resistance across XY?

  1. A5.2 Ω\Omega
  2. B5.8 Ω\Omega
  3. C6.2 Ω\Omega
  4. D10.0 Ω\Omega

Question 29

Potential divider

The diagram shows a potential divider circuit consisting of an LDR and a fixed resistor, R.

What is the potential at X?

  1. A2.0 V
  2. B2.5 V
  3. C5.0 V
  4. D8.0 V

Question 30

Mains electricity

The diagram shows a three-pin plug.

Which combination correctly identifies wires X, Y and Z?

  1. AX live; Y neutral; Z earth
  2. BX neutral; Y earth; Z live
  3. CX neutral; Y live; Z earth
  4. DX live; Y earth; Z neutral

Question 31

Magnetism
Which one cannot be used for demagnetisation?
  1. Aheating
  2. Bhammering
  3. Cdirect current
  4. Dalternating current

Question 32

Generators
Alternating current generators are different from direct current generators because they have
  1. Acarbon brushes.
  2. Bsplit rings.
  3. Ccommutators.
  4. Dslip rings.

Question 33

Electromagnetic induction
Lenz's law states that
  1. Acurrent is proportional to voltage provided temperature remains constant.
  2. Bdirection of induced emf is such as to oppose the effect causing it.
  3. Cinduced emf is directly proportional to the rate of change of magnetic flux.
  4. Denergy is neither created nor destroyed but changed from one form to another.

Question 34

Rectification
Which diagram shows the variation of a.c. voltage with time after a full-wave rectification process?
  1. AA
  2. BB
  3. CC
  4. DD

Question 35

Transformers

A transformer with an input voltage of 2 400 V and an output voltage of 240 V has 2 000 turns on the primary coil.

What is the number of turns on the secondary coil?

  1. A10
  2. B200
  3. C2 160
  4. D20 000

Question 36

Cathode rays
What name is given to the process of directing electrons into a fine beam in the cathode ray oscilloscope?
  1. Aemission
  2. Bacceleration
  3. Ccollimation
  4. Ddeflection

Question 37

Logic gates

The table shows a truth table for a logic gate.

Which logic gate is represented by the truth table?

  1. AOR
  2. BAND
  3. CNOR
  4. DNAND

Question 38

Electronics
Which electrical component uses a low-current circuit to switch a high current circuit on or off?
  1. Arelay
  2. Bdiode
  3. Cthermistor
  4. Dcapacitor

Question 39

Atomic structure
Isotopes of the same element contain the same number of
  1. Aelectrons.
  2. Belectrons and neutrons.
  3. Cneutrons and protons.
  4. Dneutrons.

Question 40

Radioactivity
What is the half-life of a radioactive source whose count rate falls from 4 000 to 500 in 30 minutes?
  1. A3.75 minutes
  2. B7.5 minutes
  3. C10 minutes
  4. D15 minutes

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