PREPARATORY
EXAMINATION 2013-14
SUBJECT:
SCIENCE TENTH STANDARD TIME: 3 HOURS
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Choose the correct answer for the
following 1x10=10
1. An electromagnetic radiation
having frequency more than radio waves and less than that of Infrared rays can be used for,
a) cooking b) long distance photography
c)
studying crystalline structure d)
sterilization
2. A bird raises its outer wing when
it takes a sharp turn,
a) to gain centripetal force b) to gain centrifugal force
c) to
gain stability d) none of these
3. Orbital period of an earth
satellite is 24 hours then the number of revolutions made by the satellite in one day is,
a) one b) six c)
twelve d) twenty four
4. Ice at 00C cools more
in comparison to water at 00C because,
a) latent heat of melting b) specific heat of melting
c) density d) pressure
5. Reason for placing lenses before
and after the prism in a spectroscope is, to
a)
get monochromatic light b)
minimize overlapping of color c) deviate color away d)
combine colors
6. In an experiment a sample of hard
water when heated, the gas liberated turns lime water milky, the salt present in the sample of water is,
a)
bicarbonate b) chlorides c)
sulphate d) phosphate
7. The unique property of carbon, by
which it can form long chain molecule is,
a)
allotrophy b) catenation c) isomerism d) valency
8. The impurity present in the
concentrated hematite ore is,
a)
silica b) calcium silicate c)
magnesium oxide d) coke
9. 92 X 238 is
a radioactive element it emits an alpha particle and changes in to element ‘Y’ It can be written as,
a)
90 X 236 b)
88 X 238 c)
90 X 234 d) 88
X 234
10. The usage of detergents is to be
reduced because, it is
a) biodegradable b) non-biodegradable c) duplicate d) high cost
Fill up the blanks with suitable answer 1x3=3
11. The minimum size of a fissionable
material required to sustain fission chain reaction is called ________
12. The process by which a large
portion of an atoms is taken to the higher energy state in the production of LASER is called___________________
13. If a speed
of ultrasonic sound in water is 15 km/s, after 2sec, the distance traveled in
km is__________
14. Match the
following 1x4=4
a)
G 6.63 x 10-34JS ______________________
b)
g 9.8 ______________________
c)
h 10-10cm ______________________
d)
A0 6.67x10-11Nm2Kg-2 ______________________
10-10m ______________________
9.8m/s2 ______________________
Answer the following questions in one sentence
each 1x6=6
15. Write any two methods of inducing
electromotive force in a dynamo.
16. Coiled copper is used in solar water
heater. Why?
17. How butane is differs from iso-butane?
18. Write an use of good roads for motor bike
owners?
19. During power stroke of petrol engine
piston moves with high pressure. Give reason?
20. Annealing is used in the preparation of
glass. Why?
Answer the following questions in two or three
sentence each 2x9=18
21. a) Define electromagnetic spectrum?
b) Name the electromagnetic radiations which
have lower frequency and lower wave length?
22. Give reasons for the following
a) Froth floatation is used to concentrate
copper
b) Chromium is coated on iron materials.
23. Write the role of magnesium and dilute HCl
in the extraction of silicon?
24. Write any two differences between PVC
pipes and Bakelite.
25. Draw a diagram of compression stroke of
internal combustion engine.
26. Explain the induced radio activity with an
example.
27. Write any two differences between orbital
and escape velocity?
28. a) Name
the silicon compound which is used in calico printing
b) Name the Isotope used to detect the
internal defects in machines.
29. Draw a block diagram of radio transmitter.
Answer the following questions 3x4=12
30. Write the diagram of
a device, which converts nuclear energy into electrical energy, label fuel and control rods.
31. Write Kepler’s three
laws of planetary motion?
32. a) Define a pure spectrum?
b) Name the device used to get pure spectrum?
c) Write the function of collimator?
33. Write the structural formula of
Toluene. Write any two uses of it.
Answer the following
questions 4X3=12
34. Write a neat
labelled diagram of Blast furnace.
35. Explain the different steps of evolution of Sun
like stars?
36. Define cracking
with an example? What is the use of Cracking?
