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PART - A
( Physics & Chemistry )
Four alternatives are given for each of the following questions / incomplete
statements. Only one of them is correct or most appropriate. Choose the correct
alternative and write the complete answer along with its alphabet in the space
provided against each question. 10 1 = 10
1. It is a good practice to make children play for sometimes in the morning sunlight. By
this practice body gains
(A) Vitamin B (B) Vitamin C
(C) Vitamin D (D) Vitamin A.
Ans :

2. The distance between moon and the earth can be determined by which of the
following techniques ?
(A) Laser ranging
(B) Radiography
(C) Sonar
(D) Holography.
Ans :
3. In which of the following strokes of the working of an internal combustion engine the
inlet valve is closed and the outlet valve is open ?
(A) Intake stroke
(B) Compression stroke
(C) Power stroke
(D) Exhaust stroke.
Ans :
4. One disadvantage of internal combustion engine is
(A) it has low efficiency
(B) there are chances of break-down of engine
(C) it releases more carbon monoxide
(D) it releases more carbon dioxide.
Ans :

5. Under which of the following circumstances it is more suitable to use ultrasound
scanner ?
(A) To find fractured bone
(B) To detect the metallic articles in a suitcase
(C) To study the working of heart
(D) To find the defects of teeth.
Ans :
6. The number of hydrogen atoms that should be removed from butane to make it
butene is
(A) 2 (B) 4
(C) 6 (D) 8.
Ans :
7. Which of the following raw materials do you select to reduce the cost of
manufacturing soap ?
(A) Crude oil
(B) Coconut oil
(C) Groundnut oil
(D) Non-edible vegetable oil.
Ans :

8. Raw materials used in the manufacture of detergents are
(A) vegetable oil, sodium hydroxide, long chain hydrocarbon
(B) long chain hydrocarbon, sodium hydroxide, sulphuric acid
(C) long chain hydrocarbon, vegetable oil, sulphuric acid
(D) vegetable oil, sodium hydroxide, sulphuric acid.
Ans :
9. Pre-matured cataract in human beings is caused by
(A) radiowaves
(B) ultrasonics
(C) infrared rays
(D) ultravoilet rays.
Ans :
10. The bending of black absorber pipe in the form of coil in solar water heater
(A) increases the efficiency
(B) enables water to flow easily
(C) retains water for long time in the pipe
(D) increases area of absorption.
Ans :

Answer the following : 6 1 = 6
11. Why does a runner lean towards the centre of the curves while running in a curved
path ?
12. When a mixture of fine sand, sawdust and water are rotated in a centrifuge, sand
moves away towards the edges. Why ?
13. Write any two uses of solar cell.

14. Why do the sun-spots appear dark ?
15. How is fuel saved if pressure cooker is used in cooking ?
16. Though by permutit process we can make hard water soft, the water may not be
potable. Why ?

17. Match the compounds in List-A with their molecular formulae in List-B. Write the
correct answer in the space provided : 4 1 = 4
List-A List-B
(a) Propane (i) C2H6
(b) Acetylene (ii) C3H6
(c) Ethane (iii) C4H6
(d) Butyne (iv) C3H8
(v) C6H12
(vi) C6H6
(vii) C2H2
Ans. : a)
b)
c)
d)
Fill in the blanks : 3 1 = 3
18. Valency of dopant of base region of n-p-n transistor is ………………………… .
19. The principle used in tracking of artificial satellite is ……………………………… .
20. The process of slow cooling of glass is called ……………………………………… .

Answer the following questions : 9 2 = 18
21. Write common parts present in motor and dynamo.
22. Draw a neat diagram of DC motor.

23. Write any two experimental facts regarding photoelectric effect.
24. Draw a block diagram of radio receiver.

25. Draw a neat diagram of external combustion engine.

26. What is the product formed when heated aluminium powder is sprinkled in a gas jar
containing chlorine ? Write balanced chemical equation of the reaction.
27. a) How is the substance used in grinding tools prepared from silicon and coke ?

b) How do you obtain hydrogen gas from silicon and water ?
28. Write two differences between thermosetting plastics and thermoplastics.

29. What is hard water ? Name two salts which cause temporary hardness in water.

Answer the following : 4 3 = 12
30. Write Kepler’s three laws of planetary motion.

31. a) The age of which of the following materials can be found by using radio-carbon ?
Quartz, Wood, Copper.
b) Half-life period of radio phosphorus is 3 minutes. After its preparation it decays
and in 12 minutes 2 grams of mass is remained. What was its initial mass when
it was prepared ?

32. What is spectroscope ? Write functions of collimator and telescope of a spectroscope.

33. Draw a neat diagram of nuclear power plant and label the following parts :
i) Moderator ii) Heat exchanger.

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