Science- Paper-IV
This paper contains 25 questions. All questions are compulsory. Each question carry 2 marks. Max. time to complete this paper is 30 minutes.
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1. Reptiles hibernate during *
2 points
2. Battery charger converts electrical energy into ______ energy. *
2 points
3. Salty water can be made pure by the method of *
2 points
4. The Sun’s mass is mainly consist of *
2 points
5. What divides the Earth into the Northern and the Southern Hemispheres? *
2 points
6. Ozone protects the Earth from harmful ultraviolet radiations from the Sun. The chemical formula of ozone is- *
2 points
7. Long-sight defect could be corrected by using _______ lens. *
2 points
8. Deficiency of Vitamin-A results in *
2 points
9. For a fixed mass of gas at constant temperature, if we decrease volume, the pressure will *
2 points
10. The lifespan of Red Blood Cells is __________ days. *
2 points
11. The density of water is *
2 points
12. Radioactivity was discovered by *
2 points
13. A device which converts chemical energy into electrical energy is called *
2 points
14. The Sun’s mass is mainly consist of hydrogen (about 73%). The second main constituent (about 25%) is *
2 points
15. The Sun is a *
2 points
16. The average adult has a blood volume of about __________ liters. *
2 points
17. The most abundant element in the universe is *
2 points
18. The most abundant element in the Earth’s crust is *
2 points
19. Each day human body breathe in __________ liters of air. *
2 points
20. Deficiency of Vitamin-D results in *
2 points
21. The SI unit of “pressure” is *
2 points
22. The most densest substance on the Earth is *
2 points
23. A camera uses a __________ to form an image. *
2 points
24. Which from the following is NOT a conductor? *
2 points
25. CNG stands for *
2 points
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