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Physics · Karatasi 1 · 2002

22 maswali

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Maswali (22)

Sehemu A

1. 1 alama

The planet in the solar system that is surrounded by rings is

A. Mars
B. Venus
C. Earth
D. Jupiter
E. Saturn
2. 10 alamas

Match the items in list A with the responses in list B by writing the letter of the correct response beside the item number. Each item carries 1 mark.

(i) Pressure depends on the area of contact 1 alama
(ii) Light’s velocity is greater than sound’s velocity 1 alama
(iii) Doping process 1 alama
(iv) Electroplating 1 alama
(v) Mass 1 alama
(vi) Efficiency 1 alama
(vii) Lunar eclipse 1 alama
((viii) Iris 1 alama
(ix) Linear expansivity 1 alama
(x) Critical angle 1 alama

Boresha ili kuona majibu ya mfano.

4. 7 alamas

(a) Distinguish the three states of matter in terms of volume, motion of molecules and intermolecular forces. 3 alama
(b) Discuss briefly the behaviour of one molecule of a liquid during the process of evaporation and subsequent condensation of the liquid. 2 alama
(c) A metal rod is 10 m long at 20°C. At what temperature would it’s length increase by 5 cm if its linear expansivity is 2 x 10​-6K​. 2 alama

Boresha ili kuona majibu ya mfano.

5. 7 alamas

(a) Give two differences between images formed in plane mirrors and in a pin hole camera. 2 alama
(b) Draw a sketch diagram to show position of object and image in a concave mirror such that the image is virtual. 3 alama
(c) An object is placed 20 cm from a concave mirror of unknown focal length. A real image is formed whose height of the object. Calculate the position of the image and focal length of the mirror. 3 alama

Boresha ili kuona majibu ya mfano.

6. 6 alamas

(a) Define the following: (i) Capacitor (ii) Inductor. 2 alama
(b) Briefly state the variation of the following over a pear-shaped conductor. (i) Potential . (ii) Charge density 2 alama
(c) What will the effect on an electron be as it passes between two plates A and B one of which carrying a + ve charge and the other carrying a - ve charge? 2 alama

Boresha ili kuona majibu ya mfano.

Sehemu B

3. 7 alamas

Answer ALL questions in this section.

(a) Define the following terms (i) Momentum (ii) Kinetic energy (iii) Work. 3 alama
(b) Calculate a constant force required to bring an object of mass 2.0 kg moving with a velocity of 4.0 ms-1 to rest in 4 alama
(i) 0.1 sec 2 alama
(ii) 2 m. 2 alama

Boresha ili kuona majibu ya mfano.

7. 6 alamas

(a) Define (i) emf of a cell (ii) resistivity. 2 alama
(b) (ii) If the same cells are connected in parallel to each other and the combination placed in series with the 11 Ω resistor. What will the current in the resistor be? 2 alama
(c) (ii) internal resistance of the cell. 2 alama

Boresha ili kuona majibu ya mfano.

8. 10 alamas

(a) Define a star and give the name of the one closest to the Earth. 3 alama
(b) (ii) Name two brightest planets in the solar system. 2 alama
(c) A communications satellite appears to be stationary over one point on the earth’s surface when it is moving in a circular orbit of radius 42,000 km. Find its speed in km/h given that it must complete one orbit in 24 hours. 4 alama

Boresha ili kuona majibu ya mfano.

9. 3 alamas

If the same ship (in 9 (c) (i) above) enters fresh water, what mass of a cargo must be unloaded so that the same volume of fresh water is displaced as before?

(a) State (i) the law of flotation (ii) the Archimede’s principle. 2 alama
(b) A piece of corke of density 250 kgm-3 ​has a mass of 0.02 kg. What fraction of the cork is immersed when it floats in water? 3 alama
(c) A ship of mass 1200 tones floats in sea water. What volume of seawater does it displace? 2 alama

Boresha ili kuona majibu ya mfano.

10. 6 alamas

The diagram below (Fig. 1) shows a circuit in which important components A and B are removed. Fig. 1 Answer the following questions with reference to Fig 1:

(a) Explain how an extrinsic semiconductor is constructed. 1 alama
(b) Describe the mode of action and application of PN junction diode. 2 alama
(c (i)) What does A and B represent? 2 alama
(c (ii) Draw a well labelled circuit diagram for the circuit above. 2 alama

Boresha ili kuona majibu ya mfano.

11. 10 alamas

(a (i)) What are the two types of x-rays? 2 alama
(a (ii) X-rays are said to have harmful effect to human beings when used for a long time. Explain the effect that X-rays cause to human beings. 1 alama
(b) Describe how X-rays are produced in the X-ray tube. 3 alama
(c) Show the three main parts of Cathode Ray Oscilloscope on a well labelled diagram. 4 alama

Boresha ili kuona majibu ya mfano.

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