A gas of volume 900 cm3 at 270 C when warmed at constant pressure to 87oc will occupy a new volume of
Which of the following scientific statements needs to be proved through scientific research?
(iii)
What will be the acceleration of the car while its speed was increasing as shown in Figure 1?
(iv) Which of the following electromagnetic waves have largest wavelength
(v) The device which operates under the principle oftotal internal reflection of light is called:
(vi) If 120 volts are used to light a 30-wattlight bulb, what will be the current flowing through that bulb?
(vii) When a lead - .acid accumulator is freshly made it has an electromotive force (e.m.f) of
(viii)Which among the following radiations can be absorbed by a metal plate?
(ix)Where are asteroids found in the solar system?
(x) What fraction of the atoms would have been disintegrated in 72 hours when the half-life of an element is 24 hours?
2. Match the items in List A with responses in List B by writing the letter of the correct response beside the item number in the answer booklet provided.
LIST A | LIST B |
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3. For each of the items (i)-(x), fill in the blank spaces by writing the correct answer in the answer booklet provided.
The velocity of the body as noted by a non-stationary observer is called
Which method of heat transfer does not involve the actual movement of particles from their mena position? .
What name is given to the angle of incidence when the angle of reflection is 90°?
A temperature at which solids change to liquids at constant temperature is referred to as
Colours which when mixed in a definite ratio yield white colour are known as
Which type of a resistor is used to convert moving coil galvanometer into voltmeter?
Cathode ray tube is used in the production of
A group of stars that forms a definite shape or pattern when viewed from the earth is called
Which rule summarizes the relation of force, current and the field being mutually perpendicular to each other?
Which region in electromagnetic spectrum has lowest frequency? .
SECTION B (60 Marks)
Answer all questions in this section.
4. (a) Mention four applications of thermal expansion of solids.
View Ans(b) Briefly explain why holes are left below the chimneys of kerosene lamp or kitchen.
View Ans(c) A steel tyre of diameter 150 cm at 10°C is to be fitted on to a train wheel of diameter 151 cm. What temperature must the tyre be heated to just fit the wheel?
View Ans5. (a) (i) Why convex mirrors are used as driving mirrors? Give two reasons.
View Ans(ii) Calculate the critical angle for the light emerging from a glass of refractive index 1.50.
View Ans(b) (i) How people with short-sighted defect differ from those with long-sighted defect?
View Ans(ii) Calculate the focal length of a lens when a projector is used to produce a sharp image of an object being at a distance of 120 cm from the screen.
View Ans6. (a) (i) What peculiar property does the effort has in all classes of levers?
View Ans(ii) A metre rule of weight 1.0 N is supported horizontally on two knife edges each placed 10.0 cm from its ends. If the weight of 1.5 N is placed at its mid-point, calculate the reaction at the supports.
View Ans(b) (i) State the law of floatation.
View Ans(ii) Find the fraction of the cork that partially immersed when a piece of cork of density 0.25 g/cm3 and a mass of 20 g floats in water.
View Ans7. (a) (i) What is the essential of kinetic theory of matter?
View Ans(ii) Sketch a graph showing how force applied in a stretched string varies with its extension.
View Ans(b) (i) State Hooke’s law.
View Ans(ii) List two applications of gamma rays.
View Ans8.(a) (i) Define the term wavelength.
View Ans(ii) How does the size of the gap in the barrier affect the diffraction of waves?
View Ans(b)(i) State two ways in which visible light differ from radio waves.
View Ans(ii) List two applications of gamma rays.
View AnsFigure 2 and 3 shows a wave travelling across water. Carefully study it then answer the questions that follow:
Determine the
Frequency of the wave.
Velocity of the wave.
9. (a) (i) What is meant by mutual induction.
(ii) Illustrate how the right hand grip rule is used to determine electric current and magnetic field directions.
View Ans(b) (i) Draw the diagram of direct current (d.c) generator showing its important parts.
(ii) Briefly explain how simple a.c dynamo can be converted to simple d.c dynamo.
View AnsSECTION C (10 Marks)
Answer one (1) question from this section.
10 (a) (i) Define the term semiconductors.
(ii) How do intrinsic semiconductors differ from extrinsic semiconductors?
View Ans(a) (i) List four properties of cathode rays.
(ii) Describe how x-ray tube is used to produce x-rays.
View Ans(c) (i) Mention three uses of induction coil.
(ii) Briefly explain the working principle of a bicycle dynamo.
View Ans11. (a) How does the increase of length and cross-section area of a conductor affect its resistance?
View Ans(b) (i) State the function of a circuit breaker in a wiring system.
(ii) Determine the ratio of resistance of wire A to that of wire B which are made up of the same material such that wire A has half the length and twice the diameter of wire B.
View Ans(c) An electric kettle contains 720 W heating units:
What current does it take from 240 V mains?
How long will the kettle take to raise the temperature of 2 kg of water at 30°C to its boiling point?