Science
(Hindi & English Version) Time : 3 Hours Maximum Marks : 75
Note:
(i) All questions are compulsory.
(ii) Internal options are given in Question Nos. 9,11, 16, 17,
19, 21 and 22.
(iii) Answer Question No 1 to 6 in about 30 words each.
(iv) Answer or Question No 7 to 12 in about 50 words each.
(v) Answer Question Nos 13 to 17 in about 75 words each.
(vi) Answer Question Nos. 18 to 22 in about 150 words each.
(vii) Draw neat and clean labelled diagrams wherever required.
(viii) Marks of each question are indicated against it.
1. Which isotope of hydrogen is present in the core (Nucleus) of
Sun ? 2
2. Define super-saturated solution. 2
3. Why is charcoal better fuel than wood ? 2
4. Why do plants look green ? 2
5. Write the name of hormones secreted by Thyroid gland. 2
6. Name the reproductive organs of hermaphrodite flower. 2
7. Give the technological advances between the period of 1940 to
1950. 3
8. What three precautions should be taken while using physical
balance ? 3
9. Draw a well labelled diagram of Spherometer.
(Or)
When the circular cap of a screw gauge is rotated 5 times, the
screw shifts by 4 mm. If there are 100 divisions on the circular
scale, find out the pitch and the least count of screw gauge. 3
10. Why is kidney called as dialysis bag ? 3
11. How does excretion of gaseous material occur in animals ?
(Or)
Write the names of blood corpuscles with their functions. 3
12. Explain the causes of short-circuit. 3
13. Write down the different uses of water. 4
14. Write only the equation of action of metals with Oxygen, Chlorine,Hydrogen and any one of dilute acid. 4
15. Why is L.P.G. a good fuel ? 4
16. Write the significance of fermentation.
(Or)
Draw a labelled diagram of Palisade cell'. 4
17. What is tissue culture ? Explain it.
(Or)
Write the various functions of Brain. 4
18. Diamond is a bad conductor of electricity whereas graphite is a good conductor. Explain with reason. 5
19. Explain carbon dioxide cycle in nature.
(or)
Explain how energy flows in Biosphere. 5
20. Explain with the help of a diagram how the solar energy is absorbed and transferred by living organisms. 5
21. What is internal combustion engine ? Explain its mechanisms.
(Or)
Explain the nuclear reactor with the help of labelled diagram. 5
22. Verify Ohm's law in laboratory on the following heads :
(i) Circuit diagram
(ii) Observation table
(iii) Any two precautions.
Explain the following with examples
(i) Paramagnetic substance
(ii) Ferromagnetic substance
(iii) Diamagnetic substance. 5