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ZIMSEC O Level · 4023/2 · N2020

Physics Paper 2 November 2020

Questions
34
Total marks
126
Time allowed
120 min
Syllabus code
4023/2

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Questions
34
Pass mark
21
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Answer every question in the printed order, get marked at the end, then see the answers.

The questions

Question 101

[1 marks]SI units, density
In the SI system of units, what is the name of the unit of time?

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Question 102

[1 marks]SI units, density
In the SI system of units, which physical quantity has the SI unit kelvin and the symbol K?

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Question 103

[1 marks]SI units, density
A cuboid has dimensions 7 cm x 6 cm x 6 cm and a mass of 500 g. Calculate the density of the cuboid.
  1. A26.32 g/cm3
  2. B1.98 g/cm3
  3. C11.90 g/cm3
  4. D0.50 g/cm3

Question 201

[1 marks]Kinematics, velocity-time graphs
A velocity-time graph is a straight line from the origin rising at a constant positive gradient. What quantity does the gradient of this graph represent?

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Question 202

[1 marks]Kinematics, velocity-time graphs
On a velocity-time graph, how is the distance covered by a moving body obtained?

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Question 203

[1 marks]Kinematics, velocity-time graphs
A velocity-time graph is a straight line from the origin rising at a constant positive gradient. How would the gradient of this graph be classified?
  1. AIncreasing
  2. BNegative
  3. CPositive
  4. DZero

Question 301

[1 marks]Moments
Which of the following best defines the moment of a force about a point?
  1. AThe sum of the force and the perpendicular distance from the pivot.
  2. BThe force divided by the perpendicular distance to the pivot.
  3. CThe product of the force and the perpendicular distance from the line of action of the force to the point.
  4. DThe product of the force and the total distance the object moves.

Question 302

[1 marks]Moments
A spanner is used to tighten a nut. A force of 450 N is applied perpendicular to the spanner at a distance of 20 cm from the nut. Calculate the moment of the force.
  1. A90 Nm
  2. B9000 Nm
  3. C2250 Nm
  4. D45 Nm

Question 303

[1 marks]Moments
For a body in equilibrium, the principle of moments states that the sum of the clockwise moments about any point equals what?

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Question 401

[1 marks]Refraction
In refraction, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant. What is this law commonly called?

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Question 402

[1 marks]Refraction
A straight drinking straw is partially immersed in water at an angle. Which of the following best explains why the straw appears bent at the water surface when viewed from above?
  1. ALight from the submerged part of the straw refracts and bends away from the normal as it leaves the water, so the submerged part appears displaced.
  2. BLight from the submerged part of the straw is totally internally reflected before it leaves the water.
  3. CThe water absorbs some wavelengths of light, distorting the shape of the straw.
  4. DThe straw itself bends slightly due to the upward force (upthrust) of the water.

Question 501

[1 marks]Structures (roof trusses)
What type of joint is used to hold together the wooden members of a roof truss?

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Question 502

[1 marks]Structures (roof trusses)
Which of the following is NOT a factor that affects the strength of joints in wooden roof trusses?
  1. AThe length of overlap at the joint.
  2. BThe colour of paint applied to the truss.
  3. CThe number and distribution of nails used.
  4. DThe size of the nails used.

Question 503

[1 marks]Structures (roof trusses)
Which of the following is NOT a disadvantage of using wooden roof trusses?
  1. AThey rot and are not durable.
  2. BThey are susceptible to fire damage.
  3. CThey can be attacked by termites.
  4. DThey are lightweight and easy to transport.

Question 601

[1 marks]Machines (pulley systems)
A pulley system has one fixed pulley block of two wheels and one movable pulley block of two wheels, giving four strings supporting the movable block, used to lift a load. What is the velocity ratio of this pulley system?

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Question 602

[1 marks]Machines (pulley systems)
A pulley system lifts a load of 500 N using an effort of 200 N. Calculate the mechanical advantage of the pulley system.
  1. A0.4
  2. B2.5
  3. C300
  4. D700

Question 603

[1 marks]Machines (pulley systems)
A pulley system has a velocity ratio of 4. It lifts a load of 500 N using an effort of 200 N, giving a mechanical advantage of 2.5. Calculate the efficiency of the pulley system.
  1. A10%
  2. B60%
  3. C62.5%
  4. D160%

Question 701

[1 marks]Optics (the eye, magnification)
Which of the following best defines magnification, as applied to an image formed by a lens?
  1. AThe ratio of the height (or distance) of the image to the height (or distance) of the object.
  2. BThe sum of the object distance and the image distance.
  3. CThe difference between the image distance and the object distance.
  4. DThe ratio of the height of the object to the height of the image.

Question 702

[1 marks]Optics (the eye, magnification)
An object is placed 4 cm from a lens, and its image is formed 12 cm from the lens. Calculate the magnification.
  1. A0.33
  2. B3
  3. C8
  4. D16

Question 801

[1 marks]Electricity (cells, e.m.f.)
What is the SI unit of electromotive force (e.m.f.)?

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Question 802

[1 marks]Electricity (cells, e.m.f.)
A learner has three identical 1.5 V cells. Which arrangement of the three cells would produce the greatest combined e.m.f.?
  1. ATwo cells in series with the third in parallel.
  2. BOnly one cell used, with the other two disconnected.
  3. CAll three cells connected in series.
  4. DAll three cells connected in parallel.

Question 803

[1 marks]Electricity (cells, e.m.f.)
Three identical 1.5 V cells are connected in series to form a battery, giving the greatest possible e.m.f. Apart from the higher e.m.f., what is one other advantage of this arrangement compared to using a single cell?

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Question 901

[1 marks]Geothermal and solar energy, work, power
Two pipes descend from the earth's surface into cracks in hot rocks; cold water is fed down one pipe and steam rises up the other. What form of energy is being produced by this arrangement?

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Question 902

[1 marks]Geothermal and solar energy, work, power
A car of mass 400 kg travels up an incline to a point where it has gained a height of 3 m (take g = 10 N/kg). Calculate the change in gravitational potential energy of the car.
  1. A1 200 J
  2. B20 000 J
  3. C12 000 J
  4. D16 000 J

Question 903

[1 marks]Geothermal and solar energy, work, power
A car moves up an incline at a constant speed of 10 m/s against a frictional force of 200 N. Calculate the power generated against friction.
  1. A1 000 W
  2. B210 W
  3. C20 W
  4. D2 000 W

Question 1001

[1 marks]Kinetic theory, solar water heating, specific heat capacity
In a solar water heater, which component of electromagnetic waves is mainly responsible for heating the water?

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Question 1002

[1 marks]Kinetic theory, solar water heating, specific heat capacity
Which of the following is NOT a property of a gas?
  1. AThe particles have the highest kinetic energy of the three states of matter.
  2. BThe particles are closely packed with little space between them.
  3. CThe gas has no definite shape or volume.
  4. DThere are very weak forces of attraction between the particles.

Question 1003

[1 marks]Kinetic theory, solar water heating, specific heat capacity
In an experiment, a 40 W heater is used to heat 1 kg of water from 20 degC to 26 degC in 10 minutes. Calculate the specific heat capacity of the water, assuming no heat losses and a beaker of negligible heat capacity.
  1. A24 000 J/kg degC
  2. B4 000 J/kg degC
  3. C66.7 J/kg degC
  4. D923 J/kg degC

Question 1101

[1 marks]Reflection, periscopes, cameras, prisms, mirages
Which of the following correctly states one of the laws of reflection?
  1. AThe angle of incidence is always twice the angle of reflection.
  2. BThe angle of incidence plus the angle of reflection equals 90 degrees.
  3. CThe angle of reflection is independent of the angle of incidence.
  4. DThe angle of incidence is equal to the angle of reflection.

Question 1102

[1 marks]Reflection, periscopes, cameras, prisms, mirages
A camera lens forms an image of an object on the film. Apart from its size, state one other property of this image.

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Question 1103

[1 marks]Reflection, periscopes, cameras, prisms, mirages
Name one optical device that makes use of a 45-45-90 degree glass prism to redirect light by total internal reflection.

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Question 1201

[1 marks]Electromagnetism, radioactivity
A current-carrying wire is placed between the north pole and south pole of two permanent magnets and connected to a battery through a switch. Explain what happens to the wire when the switch is closed.
  1. AThe wire's magnetic field interacts with the field of the permanent magnets, producing a force that makes the wire move.
  2. BThe wire becomes permanently magnetised and attracts the poles.
  3. CThe resistance of the wire drops to zero and no current flows.
  4. DThe wire heats up uniformly but does not move.

Question 1202

[1 marks]Electromagnetism, radioactivity
What is meant by the half-life of a radioactive isotope?

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Question 1203

[1 marks]Electromagnetism, radioactivity
The initial mass of Uranium-236 in a sample is 300 g. If the half-life of Uranium-236 is 24 days, calculate the number of half-lives that occur in 72 days.
  1. A1.5
  2. B2
  3. C3
  4. D6

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