CSEE Physics Paper 1 2007 — Past Paper & Online Quiz

1. 1 mark

A stone is thrown horizontally from the top of a building at a speed of 12 m/s. How long does it take to fall 45 metres vertically? (Assume negligible air resistance).

A. 1.0 sec.

B. 5.0 sec.

C. 3.0 sec.

D. 8.0 sec.

E. 2.14 sec.

2. 1 mark

Which of the following statements is correct?

A. Friction acts in the same direction as motion.

B. Air friction can cause a body to become hot.

C. Certain lubricants can reduce friction to zero.

D. For a given body the frictional force depends on the area in contact with the surface.

E. Walking would be made easier if friction did not exist.

4. 10 marks

((a)(i) What is meant by lower fixed point? 0 mk

((b)(i) Give two (2) similarities and two (2) differences between a maximum thermometer and a minimum thermometer. 2 mk

((c)(i) 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 kg-1 °C-1). 3 mk

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5. 7 marks

((a)(i) Why does an object appear coloured when light falls onto it? 1 mk

((b)(i) Explain why the result of mixing blue and yellow paints is very different from that of mixing blue and yellow lights? 3 mk

(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 3 mk

((c)(i) focal length of the lens. 2 mk

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6. 8 marks

((a)(i) What role does a capacitor play when used in a.c. circuits? Give one example. 0 mk

(a) What role does a capacitor play when used in d.c. circuits? What role does a capacitor play when used in a.c. circuits? Give one example for each. 2 mk

((b)(i) An insulated plate A having a negative charge is joined to a plate B of positive charge by a resistance wire. If a charge of 10^6 C flows through the wire of resistance 2 Ω in 10^-6 seconds how much heat is dissipated in the wire? 1 mk

((c)(i) Discuss the charge distribution on a lightning conductor as clouds pass over its spikes. 0 mk

(c) Discuss the charge distribution on (i) the surface of a solid conductor of irregular shape (ii) a hollow conductor (iii) a lightning conductor as clouds pass over its spikes. 2 mk

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10. 1 mark

(c) State the factors which determine the size of an induced e.m.f. 1 mk

((a)(i) A 5 Ω resistor and a 1 Ω resistor are connected in parallel to a cell of e.m.f. 6 V and internal resistance 0.5 Ω. Calculate the current flowing round the circuit. 2 mk

((b)(i) current through the bulb. 1 mk

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3. 4 marks

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.

((a)(i) If the length of methanol column was altered to 21.50 cm what would be the new height of the water column? 1 mk

(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 mk

((c)(i) Calculate the mass of the half-metre rule. 2 mk

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9. 4 marks

A bullet of mass 3.0 g moving at 400 ms$^{-1}$ hits a tree trunk and comes to rest inside the tree after penetrating a depth of 60 mm, calculate the:

(i) kinetic energy of the bullet as it hits the tree. 2 mk

(c) How is kinetic energy distinguished from potential energy? 1 mk

(a) State Archimede’s principle. 1 mk

((b)(i) What energy transformation occurs in a battery used to light a bulb torch. 1 mk

(b) A block of metal of density 2700 kg/m$^3$ has a volume of 4.0 x 10$^{-2}$ m$^3$. Calculate the: (ii) mass of the block 1 mk

(ii) average force of retardation as it passes through the tree. 2 mk

(c) A block of metal of density 2700 kg/m$^3$ has a volume of 4.0 x 10$^{-2}$ m$^3$. Calculate the: (iii) apparent weight when immersed in brine of density 1200 kg/m$^3$. 1 mk

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7. 3 marks

In the circuit shown in figure 2 the total resistance between X and Y is 2.0 Ω. Calculate the unknown resistance Q.

(a) List three (3) factors that affect the resistance of a wire and discuss how they affect the resistance. 3 mk

(b) How does the electromotive force e.m.f. differ from the potential difference of a cell? 0 mk

(c) A 2.0 m long resistance wire of cross section 0.5 mm$^2$ has a resistance of 2.2 Ω. Find the (i) resistivity of the material (ii) length of the wire that would give a total resistance of 1.0 Ω when placed in parallel. 3 mk

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8. 3 marks

Thorium disintegrates in the following manner 232 90 Th → 228 88 Ra → 228 89 Ac → 228 90 Th → 228 88 Ra State the particles emitted at each part of the disintegration. A thorium 228 radioactive source placed in a polythene bottle decayed into a radioactive gas thoron. The decay process was recorded by the Geiger-Muller (G-M) tube as follows: Time in minutes 0 4 8 12 16 20 Count rate 40 30 20 14 10 7 (i) Draw the graph of the count rate against time. (ii) From the graph determine the half-life of thoron.

(a) Name three (3) basic radiation that occur naturally. Discuss briefly the properties of the radiations mentioned in 8(a)(i) above in terms of penetrating power 3 mk

(b) Define mass number and atomic number 2 mk

(c) A thorium 228 radioactive source placed in a polythene bottle decayed into a radioactive gas thoron. The decay process was recorded by the Geiger-Muller (G-M) tube as follows: Time in minutes 0 4 8 12 16 20 Count rate 40 30 20 14 10 7 (i) Draw the graph of the count rate against time. (ii) From the graph determine the half-life of thoron. 3 mk

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11. 3 marks

(c) How are hard x-rays produced? 1 mk

((d)(i) Use the following information to calculate the current gain of a C-E amplifier. | $I_B \times 10^{-6}$ A | 100 | 200 | 300 | 400 | 500 | | $I_C \times 10^{-3}$ A | 5 | 10 | 15 | 20 | 25 | 1 mk

((a)(i) If a gas is maintained in a CRT, will the image be formed onto the screen? Explain. 1 mk

((b)(i) In the production of x-rays what is the role of tungsten target? 1 mk

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Physics · Paper 1 · 2007

Physics · Paper 1 · 2007

Section A

Section B

Section C

Section D

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