An object of 5 cm is placed 25 cm away from the concave mirror of radius of curvature 24cm. Deduce the position and characteristics of the image formed.
A.23.1cm, real, inverted and diminished
B.23.1cm, real, inverted and magnified
C.25.0cm, real, upright and diminished
D.25.0cm, real, upright and magnified
E.23.1cm, virtual, inverted and diminished
2.1 alama
Suppose an engine raises 200kg of water steadily through a height of 60m in 20s. If the upward force used is equal to the weight of water raised, calculate the power in kW.
A.4 kW
B.5.88kW
C.3kW
D.5kW
E.7kW
Sehemu B
3.4 alamas
Identify the type of lens which fits a person with:
Why concave mirrors used as shaving mirrors? Explain with a aid of a well-labelled diagram.
((a)(i)
Long-sighted defect
2 alama
(b)
Explain with the aid of a well-labelled diagram.
5 alama
Boresha ili kuona majibu ya mfano.
4.9 alamas
Draw a diagram of a simple mercury barometer showing clearly:
Figure 2 shows rulers balanced at their centers of gravity in Case I and II. Determine the difference in weight between A and B.
(i)
The temperature of melting ice.
1 alama
((a)(i)
The atmospheric pressure and height of the mercury.
3 alama
(ii)
The temperature scale that is used in the SI system of units.
1 alama
(iii)
measure of the average kinetic energy of the particles in a substance.
1 alama
(b)
Determine the difference in weight between A and B.
4 alama
(iv)
The temperature of boiling water.
1 alama
(v)
A temperature scale based on absolute scale.
1 alama
(vi)
The point in which all molecular motion stops at -273.15 °C.
1 alama
Boresha ili kuona majibu ya mfano.
5.7 alamas
A wooden plank is used to raise a heavy load from point A to point B as shown in Figure 3. Use Figure 3 to show that velocity ratio = 1.
((a)(i)
State the law or principle that supports your answer in (a)(i).
2 alama
(b)
Use Figure 3 to show that velocity ratio = 1.
5 alama
Boresha ili kuona majibu ya mfano.
6.10 alamas
Suppose 105g of water at 75°C is added to 215g of cold water at 15°C and the mixture is well stirred, determine the final temperature of the mixture if the heat absorbed by the container is neglected.
((a)(i)
By using a simple diagram, show how a bimetallic strip made of iron and brass is formed when heated with the same temperature.
3 alama
(b)
Determine the final temperature of the mixture if the heat absorbed by the container is neglected.
4 alama
Boresha ili kuona majibu ya mfano.
7.7 alamas
In a certain experiment, the p.d across the terminals of the cell was 1.1 V when a current of 0.20 A was being drawn from the cell and the p.d across the terminals of the same cell was 1.30 V when the current drawn from the cell was 0.10 A. Calculate the:
(a)
Briefly explain the three factors that determine the quantity of heat generated by an electric current.
4 alama
((b)(i)
Electromotive force of the cell.
2 alama
Boresha ili kuona majibu ya mfano.
8.9 alamas
Briefly explain:
(a)
Why is Venus nicknamed as twin planet of the Earth?
4 alama
((b)(i)
Two positive effects of volcanic activity on the earth's surface.
2 alama
Boresha ili kuona majibu ya mfano.
Sehemu C
9.12 alamas
The cloud chamber is used for detecting ionized nuclear radiation.Explain how you canuse it todetect thealpha andbeta particles.
One of the nuclear laboratory scientists recorded the information such thatthe mass of received sampleXwas 20gand after 150days was0.652g.
Draw a well labelleddiagram toshow thecomponentsof acathode ray tube.
(a)
Explain how you can use a cloud chamber to detect the alpha and beta particles. (3marks)
3 alama
(b)
One of the nuclear laboratory scientists recorded the information such that the mass of received sample X was 20g and after 150 days was 0.652g.
6 alama
(b(i))
How many half-lives had elapsed for sample X to decay to 0.652g? (3marks)
3 alama
(b(ii))
Using information obtained in (b)(i), determine the half-life of sample X. (3marks)
3 alama
(c)
Draw a well labelled diagram to show the components of a cathode ray tube. (6 marks)
6 alama
Boresha ili kuona majibu ya mfano.
10.15 alamas
Briefly explain three applications of diffraction of waves.
One scientist was investigating the impact of tension on the frequency of vibrating wire. The following data were recorded:
Length of a stretched wire was 30 cm, tension of wire was 900N and slotted masses of 3g and 12g.
Use these data to show how the masses on the vibrating wire affects its frequency.
Draw the PNP and NPN transistor circuit symbols and indicate their three layers of the transistors and the direction of conventional current.
(a)
Briefly explain three applications of diffraction of waves. (6marks)
6 alama
(b)
One scientist was investigating the impact of tension on the frequency of vibrating wire. The following data were recorded:
Length of a stretched wire was 30 cm, tension of wire was 900N and slotted masses of 3g and 12g.
Use these data to show how the masses on the vibrating wire affects its frequency. (4marks)
4 alama
(c)
Draw the PNP and NPN transistor circuit symbols and indicate their three layers of the transistors and the direction of conventional current. (5 marks)
5 alama
Boresha ili kuona majibu ya mfano.
11.11 alamas
Draw a well labelled electric bell circuit and explain how it works.
Use the Fleming's left-hand rule to explain the direction of the force in a current carrying wire.
(i) What makes the efficiency of a transformer to be less than 100%. Briefly explain.
(ii) With reference to Faraday's law of electromagnetic induction, determine two factors which affect the magnitude of the induced e.m.f of the conductor.
(a)
Draw a well labelled electric bell circuit and explain how it works. (6marks)
6 alama
(b)
Use the Fleming's left-hand rule to explain the direction of the force in a current carrying wire. (3 marks)
3 alama
(c)
What makes the efficiency of a transformer to be less than 100%. Briefly explain.
With reference to Faraday's law of electromagnetic induction, determine two factors which affect the magnitude of the induced e.m.f of the conductor.
5 alama
(c(i))
What makes the efficiency of a transformer to be less than 100%. Briefly explain. (2marks)
2 alama
(c(ii))
With reference to Faraday's law of electromagnetic induction, determine two factors which affect the magnitude of the induced e.m.f of the conductor. (4marks)
4 alama
