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Form 2 Physics End of Term 2 Examination 2022
Class: Form 2
Subject: Physics
Level: High School
Exam Category: Form 2 End Term 2 Exams
Document Type: Pdf
Views: 1084
Downloads: 52
Exam Summary
SECTION A (25 MARKS)
1. Mercury on a clean glass slide collects into small spherical balls as shown in figure 1 below. Explain why . (1 mark)
2. Distinguish between natural and forced convection currents (1 mark)
3. The figure below shows how to determine the volume of an irregular solid by displacement method using a eureka can and a burette. The burette was initially empty before the solid was immersed into the eureka can. If the mass of the solid is 25g, determine the density of the irregular solid. (3 marks)
4. Give a reason why a concrete beam reinforced with steel does not crack when subjected to changes in temperature. (1 mark)
5. The figure below shows a scale of part of venier-caliper.
State the correct reading of the scale if the instrument has a zero error of -0.02cm. (2 marks)
6. Define the term ‘centre of gravity’ of a body (1 mark)
7. The figure 4, below shows a circular ring of a thin steel washer. Determine the center of gravity of the washer. (1 mark)
8. The figure 5, below shows a circuit diagram for controlling temperature of a room.
(a) Explain the purpose of the strip (1 mark)
(b) Describe how the circuit controls the temperature of the room when the switch, S is closed (3 marks)
9. The figure 6, below is a stop watch. Record the reading shown on its screen in the SI units. (2 marks)
10. One of the laws of reflection of light is that: the angle of incidence and the angle of reflection are equal. State the other law. (1 mark)
11. It is advisable for a driver moving a vehicle on muddy soil to remove some air from the tyres. Explain (2 marks)
12. Two straight conductors carrying current are placed side-by-side as shown below in figure 7. Complete the diagram by showing the field due to the current and the direction of motion of the two conductors: (2 marks)
13. State the advantages a diverging mirror has over a plane mirror when used as a rear- view in vehicles. (2 marks)
14. Using a ray diagram, illustrate how a barber may use a curved mirror as a shaving mirror (2 marks)
SECTION B (55 MARKS)
15. (a) Define the following terms:
i. Focal point of a concave mirror (1 mark)
ii. Centre of curvature (1 mark)
(b) Figure 8 shows a ray of light incident on a convex mirror. Complete the diagram to show how the incident ray is reflected by the mirror. (2 marks)
(c) Distinguish between a real and a virtual image. (2 marks)
(d) State ONE application of each of the following. (2 marks)
a. Convex mirrors
b. Parabolic mirrors
(e) An object pin is placed between two plane mirrors as shown.
i. Determine the number of images which can be seen (show clearly your working) (3 marks)
ii. Explain what is meant by a ‘magnification’ (1 mark)
16.
(a) State the basic law of magnetism (1 mark)
(b) Figure 10 shows an incomplete circuit of an electromagnet. Complete the circuit between X and Y by drawing the windings on the two arms of the core such that A and B are both North poles when the switch S is closed. Indicate the direction of the current on the windings drawn. (2 marks)
(c) State TWO factors that affect the strength of an electromagnet (2 marks)
(d) The figure below shows a circular soft iron plate placed between poles of two magnets.
i. Sketch the magnetic field pattern between the two magnets (1 mark)
ii. Give a reason why soft iron is used as a core of the coil of an electric bell. (1 mark)
(e) Figure 12, shows a horse- Shoe magnet whose poles are labeled and two other magnets near it. Iron nails are attracted to the lower ends of the magnets as shown. Identify the poles marked X and Y. (2 marks)
(f) Using domain theory, explain the difference between a magnet and magnetic material. (2 marks)
17.
(a)
i. Define ‘electric current’ and state it’s SI unit (2 marks)
ii. A student learnt that a battery of eight dry cells each 1.5V has a total e.m.f of 12V the same as a car battery. He connected in series eight new dry batteries to his car but found that they could not start the engine. Give a reason for this observation (2 marks)
(b) Distinguish between a primary cell and a secondary cell. (1 mark)
(c) State two advantages of an alkaline cell over a lead acid cell (2 marks)
(d) A current of 0.08A passes in a circuit for 2.5 minutes. How much charge passes through a point in the circuit? (3 marks)
(e)
i. State the basic law of electrostatics (1 mark)
ii. Name any two uses of a charged electroscope (2 marks)
18.
(a) The figure below shows a barometer being used for the measurement of atmospheric pressure in a given town.
i. Identify the part labelled, A (1 mark)
ii. Determine the atmospheric pressure (in N/m2) of the town (3 marks)
iii. Explain how you would test for the part labelled, A (2 marks)
(b) Asmall drop of oil has a volume of 5 x 10-8m3. When it is put on the surface of some clean water, it forms a circular film of 0.lm2 in area;
(i) What is the size of a molecule of oil? (3 marks)
(ii) State two assumptions you make in your calculations? (2 marks)
19.
(a) State the kinetic theory of matter (1 mark)
(b) The figure below is a beaker completely filled with water as shown:
A certain mass of common salt is added into the beaker but the water did not spill. Explain. (2 marks)
(c) Suggest any two reasons why diffusion in gases is faster than in liquids (2 marks)
(d) Smoke is introduced into a transparent smoke-cell containing air. The smoke cell is well illuminated and then viewed under a microscope.
i. State the use of the microscope (1 mark)
ii. State the observation made in the microscope (1 mark)
iii. Explain the observation made in d, ii above (1 mark)
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