Time : 3 Hours Maximum Marks : 75
Note :
(i) All questions are compulsory.
(ii) Internal options are given in Question Nos. 8, 11, 15,17,
19, 21 and 22.
(iii) Answer Question Nos. 1 to 6 in about 30 words each.
(iv) Answer Question Nos. 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. Define Acidic Rain. 2
2. Why do fuels burn quickly ? 2
3. Write names of organisms which breathe through skin. 2
4. Name two invisible radiations emitted by the sun. 2
5. Write main functions of human brain. 2
6. Write the difference between Asexual reproduction and Sexual
reproduction- 2
7. What will happen if water products from the Mathura Oil Refinery
are discharged into the Yamuna ? 3
8. Write difference between stop clock and stop watch. 3
9. Write differences between scalar and vector quantities (any three).3
(Or)
You are given two spherometers. Their pitches are 1 mm and
0.5 mm respectively. If the least count of each of them is 0.0005
cm, find the number of division on their circular head scales. 3
10. Explain the role of Stomata in transport of materials in plants. 3
11. What is Dialysis ?
(or)
Write three differences between Diffusion and Osmosis.3
12. What are hazard of electricity ? What essential precautions should be taken while in use with it ?3
13. Write down the uses of alloys.4
14. Write the name formula and two uses of universal solvent.4
15. Gas lighter is used to urn cooking gas but not candle. Explain,
why ?4
16. Write differences between Respiration and Combustion. (any four)
(or)
Explain the importance of carbon dioxide in photosynthesis. 4
17. Into how many groups can plant hormones be classified 2Write
the function of each.
(or)
Compare growth in plants and animals. 4
18. Cabon is an unique element, how ? Why do organic compound
occur in a large numbers ? 5
19. Explain producer. consumer and decomposer with example.
(Or)
Can food chain have more than 6 steps ? If not, why ? 5
20. Write differences between nuclear fusion and nuclear fission. 5
21. Draw a neat and labelled diagram of solar cooker.
(Or)
Explain the cause of energy production of the sun. 5
22. Write Coulomb's law of electricity and define unit charge.
(Or)
Prove by an experiment that identification of magnetism is repulsion
not attraction. 5