2. Match the responses in List B with the words/phrases in List A by writing the letter of the correct response beside the item number.
| List A | List B |
| (i) Hooke’s law (ii) Transfer of heat by radiation (iii) Total internal reflection (iv) Production of many positive charges in small amounts (v) Ohm’s law not applicable (vi) Longitudinal waves (vii) Proton (viii) Telephone earpiece (ix) Geigermuller counter (x) Collectorbase in common base mode | - Electrophorus
- Converts sound waves into electric currents
- Occur in gases and vacuum
- Extensions is proportional to plasticity
- Positively charged particles of the nucleus
- Detects and counts all radioactive radiations and x-rays
- Converts electric currents into sound waves
- Extension of spring is proportional to the applied force
- Van der Graaf generator
- Detects and counts ?particle radiation only
- Light must pass from a denser medium to a less dense medium
- Helium nucleus
- Emitter-base is reverse biases
- When physical conditions of a wire are altered
- Light passes from less dense to a denser medium
- Travel parallel to the direction of the wave
- Reversed biased
- Occur in the atmosphere
- Travel perpendicular to the direction of the wave
- When there occurs no loss of p.d. in an electric circuit.
|
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SECTION B (60 marks)
Answer all questions in this section.
3. (a) (i) Define relative density (1 mark)
(ii) In an experiment using Hare’s apparatus, the lengths of methanol and water columns were found to be 16 cm and 12.80 cm respectively. Find the relative density of methanol. (2 marks)
(iii) If the length of methanol column was altered to 21.50 cm what would be the new height of the water column? (1 mark)
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(b) The letter “g” can be used to denote an acceleration or the amount of force. State the conditions and the SI units under each use. (2 marks)
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(c) An uniform half metre rule is freely pivoted at the 15 cm mark and balances horizontally when a body of mass 40 g is hung at the 2.0 cm mark.
(i) Make a clear sketch to show the forces and their positions in the arrangement.
(2 marks)
(ii) Calculate the mass of the halfmetre rule. (2 marks)
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4. (a) What is meant by
(i) upper fixed point?
(ii) lower fixed point? (1 mark)
4. (a) What is meant by
(i) upper fixed point?
(ii) lower fixed point? (1 mark)
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(b) (i) List down the four (4) advantages of mercury over alcohol as thermometric liquids.
(2 marks)
(ii) Give two (2) similarities and two (2) differences between a maximum thermometer and a minimum thermometer. (2 marks)
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(c) (i) How are the heat losses in a thermos flask checked? (2 marks)
(ii) Determine the final temperature obtained when 500 g of water at 100°C was mixed with 500 g of water at 10°C and well stirred. (Note: The specific heat capacity of water
C = 4,20 J kg1 °C1). (3 marks)
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5. (a) (i) State the conditions necessary for total internal reflection to occur. (2 marks) (ii) Why does an object appear coloured when light falls onto it? (1 mark)
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(b) (i) What is meant by the term complimentary colours? (1 mark)
(ii) Explain why the result of mixing blue and yellow paints is very different from that of
mixing blue and yellow lights? (3 marks)
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(c) A screen is placed 80 cm from an object. A lens is used to produce on the screen an image with magnification 3. Calculate the
(i) distance between the object and lens. (1 mark)
(ii) focal length of the lens. (2 marks)
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MATOKEO KIDATO CHA IV 2023
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Matokeo Darasa VII 2023
