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ZIMSEC O Level · 4023/1 · N2020

Physics Paper 1 November 2020

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

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Questions
39
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
Which is the SI unit of temperature?
  1. ADegrees Farenheit
  2. BDegrees Celcius
  3. CKelvin
  4. DDegrees

Question 2

Measurement
The derived unit of force is
  1. Akgm-1s-1.
  2. Bkgms-1.
  3. Ckgms-2.
  4. Dkgm-1s-2.

Question 3

Kinematics
The diagram shows a speed-time graph for a car. What is the total distance travelled by the car?
  1. A40 m
  2. B60 m
  3. C80 m
  4. D120 m

Question 4

Forces
Terminal velocity is the velocity of a falling object
  1. Ajust after it falls.
  2. Bjust before it comes to rest.
  3. Cwhen the forces acting on it are unbalanced.
  4. Dwhen the forces acting on it are in equilibrium.

Question 5

Forces
Free fall is the falling of an object when
  1. Athe only force acting on it is gravitational force.
  2. Bthe resultant force acting on it is zero.
  3. Cthe forces acting on it are in opposite directions.
  4. Dair resistance acts against its weight.

Question 6

Forces
What is the smallest and largest resultant force that can be produced by forces of 3 N and 4 N acting at the same point?
  1. ASmallest 1 N, largest 5 N
  2. BSmallest 1 N, largest 7 N
  3. CSmallest 3 N, largest 5 N
  4. DSmallest 3 N, largest 7 N

Question 7

Forces
Which one states Newton's second law of motion?
  1. Awork done divided by displacement
  2. Bwork done divided by time
  3. Cmass x velocity
  4. Dmass x acceleration

Question 8

Momentum
Momentum is the product of
  1. Aforce and velocity.
  2. Bforce and time.
  3. Cmass and speed.
  4. Dmass and velocity.

Question 9

Forces
The diagram shows an extension-force graph. Which point A, B, C or D marks the limit of proportionality?
  1. AA
  2. BB
  3. CC
  4. DD

Question 10

Forces
A force of 20 N on a spring produces an extension of 4 cm. What will be the extension if a force of 50 N is applied to the spring, when the limit of proportionality is not exceeded?
  1. A1.6 cm
  2. B2.5 cm
  3. C10.0 cm
  4. D12.5 cm

Question 11

Forces
Which statement best describes frictional force?
  1. AOpposes motion and increases effort needed to move the object.
  2. BOpposes motion and decreases effort needed to move the object.
  3. COpposes motion and increases weight of object.
  4. DOpposes motion and decreases weight of object.

Question 12

Forces
Which statement describes circular motion?
  1. AThe object's speed changes.
  2. BThe object's velocity does not change.
  3. CThe force on the object is towards the centre of the circle.
  4. DThe acceleration of the object is directed away from the centre of the circle.

Question 13

Pressure
Which statement is NOT correct about pressure?
  1. AA fluid exerts equal pressure in all directions at the same height.
  2. BTo withstand liquid pressure, dams are built thicker at the bottom.
  3. CAtmospheric pressure decreases with increase in height.
  4. DWater in a cup does not exert any pressure on the cup.

Question 15

Machines
The mechanical advantage of a single movable pulley is
  1. A1.
  2. B2.
  3. C3.
  4. D4.

Question 16

Machines
Which formula is used to calculate efficiency?
  1. Adistance moved by effort divided by distance moved by load, x 100%
  2. Bvelocity ratio divided by mechanical advantage, x 100%
  3. Cenergy output divided by energy input, x 100%
  4. Dwork input divided by work output, x 100%

Question 17

Energy
What energy changes take place when a dart player throws a dart to the moment it hits the target?
  1. Aelastic to kinetic to potential
  2. Bkinetic to elastic to kinetic
  3. Cpotential to chemical to kinetic
  4. Dchemical to kinetic to potential

Question 18

Energy
A block of mass 4 kg slides down a frictionless slope as shown in the diagram. What is the change in gravitational potential energy?
  1. A80 J
  2. B200 J
  3. C400 J
  4. D800 J

Question 19

Energy
What is the power of an electric motor that lifts a weight of 200 N to a height of 20 m in 10 seconds?
  1. A20 W
  2. B100 W
  3. C400 W
  4. D40 000 W

Question 20

Energy
A rock of mass 3.0 kg falls from a cliff 20 m high. What is its kinetic energy on hitting the ground?
  1. A30 J
  2. B60 J
  3. C200 J
  4. D600 J

Question 21

Thermal physics
Which thermometer is suitable for measuring temperature at a point?
  1. Athermocouple
  2. Bconstant-gas volume
  3. Cplatinum resistance
  4. Dliquid in glass

Question 22

Thermal physics
Which graph describes Charles's law for a fixed mass of gas at constant pressure?
  1. AA
  2. BB
  3. CC
  4. DD

Question 23

Thermal physics
Which part, A, B, C or D on the heating curve of water represents boiling?
  1. AA
  2. BB
  3. CC
  4. DD

Question 24

Thermal physics
Which expression gives the amount of heat evolved when water of mass m, at temperature t, is frozen to ice at 0 degrees Celsius? Let the specific heat capacity of water be c and the latent heat of fusion of ice be lf.
  1. Amlf
  2. Bmc x change in temperature
  3. Cmlf + mc x change in temperature
  4. Dmc + mlf x change in temperature

Question 25

Thermal physics
Which process occurs at the surface of a liquid only?
  1. Aboiling
  2. Bfreezing
  3. Cevaporation
  4. Dcondensation

Question 26

Thermal physics
What is the purpose of the curved dish on a solar cooker?
  1. ATo trap more heat.
  2. BTo focus reflected heat.
  3. CTo reduce reflection of heat.
  4. DTo disperse reflected heat.

Question 27

Waves
Which statement is correct for a water wave passing normally from shallow to deep region?
  1. AAngle of refraction increases.
  2. BFrequency of the wave increases.
  3. CWavelength of the wave decreases.
  4. DSpeed of the wave increases.

Question 28

Light
Which statement is correct for a ray of light striking a glass-air boundary at 90 degrees?
  1. AIt bends towards the normal.
  2. BIt bends away from the normal.
  3. CIt is refracted within the glass.
  4. DIt passes through undeflected.

Question 29

Waves
Which one is a property of electromagnetic waves?
  1. AThey are longitudinal in nature.
  2. BThey require a medium for propagation.
  3. CThey cannot be refracted or reflected.
  4. DThey can travel through a vacuum.

Question 30

Light
The diagram shows a ray diagram. The image formed by the lens in the diagram is
  1. Areal and erect.
  2. Breal and inverted.
  3. Cvirtual and erect.
  4. Dvirtual and inverted.

Question 31

Electrostatics
Which diagram A, B, C or D shows the charges involved when a neutral piece of paper is attracted by a charged Perspex?
  1. AA
  2. BB
  3. CC
  4. DD

Question 32

Electricity
Where can Ohm's law be applied in the I-V characteristic graph shown?
  1. Aat Y only
  2. Bat Z only
  3. Cfrom X to Y
  4. Dfrom X to Z

Question 33

Light
The diagram shows a learner in a laboratory. The learner sees the door as it is reflected in a plane mirror. How far away from the learner is the image of the door?
  1. A1.5 m
  2. B2.5 m
  3. C4.0 m
  4. D6.5 m

Question 34

Electricity
Two wires X and Y are made of the same metal and are at the same temperature. Y is twice as long as X and has twice the cross-sectional area. Which statement is correct about the wires?
  1. AX and Y have the same resistance.
  2. BX has half the resistance of Y.
  3. CX has double the resistance of Y.
  4. DX has four times the resistance of Y.

Question 35

Electricity
The diagram shows currents flowing in and out of a junction X. How much charge passes through X in 5 minutes?
  1. A1 500 C
  2. B900 C
  3. C600 C
  4. D300 C

Question 36

Magnetism
Which diagram is correct for two conductors carrying current out of the paper?
  1. AA
  2. BB
  3. CC
  4. DD

Question 37

Electronics
Which diagram shows a smoothing capacitor correctly connected?
  1. AA
  2. BB
  3. CC
  4. DD

Question 38

Electronics
What is the resistance of the resistor shown?
  1. A2 700 ohms
  2. B3 700 ohms
  3. C27 000 ohms
  4. D37 000 ohms

Question 39

Radioactivity
Isotopes of uranium have the same
  1. Anucleon number.
  2. Bproton number.
  3. Cdecay constant.
  4. Dhalf-life.

Question 40

Radioactivity
A radioactive substance has a half-life of 3 minutes. What time is required for the count rate to decrease to one sixteenth of the initial count rate?
  1. A0.19 minutes
  2. B5.3 minutes
  3. C12 minutes
  4. D48 minutes

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