Paper 01
Time 1:15 hours (answers down the page)
SECTION 1
Directions :The group of questions below consists of five lettered headings followed by a list of numbered questions.for each numbered question select the heading which is most closely related to it. Each heading may be used once, more than once, or not at all.
QUESTIONS 1-4
The graphs A to E in Fig 1 are velocity—time graphs. Which is the most suitable graph for the following cases
1. A ball thrown vertically upwards and returning to the ground.
2. An ice puck pushed forward on a smooth horizontal surface.
3. An object released from an aeroplane at a great height.
4. A lift moving between two floors
Five electrical instruments or machines are listed below ;
A carbon microphone, B telephone receiver, C moving-coil galvanometer, D simple motor, E dynamo.
Which of these
5. Uses the attractive forces on soft iron
6. Works by electromagnetic induction
7. Uses a commutator
8. Does not rely on the magnetic effect of current for its working.
SECTION ||
Directions: Each of the questions or incomplete statement in this section is followed by five suggested answers. Select the best answer in each case.
QUESTIONS 9—20
9. When released from a height a ball falls 5m in 1 sec. In 4 sec from release it falls
A 400m B 100m C 80m D 40m E 10m
10. An object of mass 2 kg falls from a height of 20m above the ground. If g=10m/s²,the loss of potential energy just before the mass strikes the ground is
A 20J B 40J C 200J D 400J E 800J
11. A rectangular solid box has a dimensions 2m by 0.5m and a weighs 100N. When the box is placed on flat ground the maximum pressure exerted is
A 100N B 200N/m² C 100N/m² D 50N/m² E 200N.
12. A rough measure of the size of molecule can be obtained by
A measuring the height to which water rises in a narrow capillary tube
B finding the speed with which bromide vapour spreads in air
C observing brownian motion of smoke particles
D measuring the area of the circle into which a small oil drop spreads on water
E measuring the friction force between the molecules of a solid.
13. A 50W heating coil is used for 2 min to heat a metal block of 0.5 kg and specific heat capacity 1000J/KgK. The temperature rise is
A 6°C B 12°C C 15°C D 24°C E 25°C.
14. A closed flask contains air at 1 atmosphere and 27°C. When the flask heated to 127°C the pressure becomes
A 4.7 atm B 4 atm C 3¹/3 atm D 1¹/3 atm E 1¹/6atm
15. Colours are produced when white light passes through a glass prism because
A the light waves interfere
B the glass colours the light
C different colours travel at different speeds in glass
D the different colours are filtered
E diffraction of light occurs
16. Light waves differ from sound waves because
A light is an electromagnetic wave
B light waves are long and sound waves are short
C interference is obtained with light waves but not with sound waves
D the speed of light is independent of the medium in which it travels
E sound waves do not travel in water
17. A wire X is half the diameter and half the length of a wire Y of similar material. The resistance of X to that of Y is A 8:1 B 4:1 C 2:1 D 1:1 E 1:4
18. A 210W, 240V lamp has a resistance when working of
A 480 ohms B 120 ohms C 60 ohms D 20 ohms E 2 ohms
19. When a down ward current flows in a straight vertical conductor, the direction of its magnetic field at a point due north of the wire is
A upward B North C South D west E east
20. The mass of an atom depends on the number of
A neutrons B electrons C protons D neutrons+protons E alpha particles