STATE WHETHER THE FOLLOWING STATEMENTS ARE TRUE OR
FALSE. CORRECT THE STATEMENT IF IT IS FALSE:
 |
| 10th science STATE WHETHER THE FOLLOWING STATEMENTS ARE TRUE OR FALSE. CORRECT THE STATEMENT IF IT IS FALSE: |
1. The linear momentum of a system of particles is always conserved. False
2. Apparent weight of a person is always equal to his actual weight. False (not always
equal)
3. Weight of a body is greater at the equator and less at the polar region. False
Ans : Weight of a body is less at the equator and greater at the polar region.
4. Turning a nut with a spanner having a short handle is so easy than one with a long
handle. False (Difficule than one with a long handle)
5. There is no gravity in the orbiting space station around the Earth. So the astronauts
feel weightlessness. False(Equal Gravity)
6. Velocity of light is greater in denser medium than in rarer medium. False
Ans Velocity of light is greater in rarer medium than in denser medium.
7. The power of lens depends on the focal length of the lens. True
8. Increase in the converging power of eye lens cause โhypermetropiaโ. False
(Hypermyopia)
9. The convex lens always gives small virtual image. False (Concave)
10. For a given heat in liquid, the apparent expansion is more than that of real expansion. False
(Less than that of real expansion)
11. Thermal energy always flows from a system at higher temperature to a system at
lower temperature. True
12. According to Charlesโs law, at constant pressure, temperature is inversely
proportional to volume. False (Directly Proportional)
13. Ohmโs law states the relationship between power and voltage. False (between
Current and resistance)
14. MCB is used to protect house hold electrical appliances. True
15. The SI unit for electric current is the coulomb. False(Ampere)
16. One unit of electrical energy consumed is equal to 1000 kilowatt hour. False
17. The effective resistance of three resistors connected in series is lesser than the lowest
of the individual resistances. False (Greater than the lowest)
18. Sound can travel through solids, gases, liquids and even vacuum. False
Ans : Sound can travel through solids, gases, liquids
19. Waves created by Earth Quake are Infrasonic. True
20. The velocity of sound is independent of temperature. False(Dependent)
21. The Velocity of sound is high in gases than liquids. False(Low in Gases than Liquids)
22. Plutonium -239 is a fissionable material. True
23. Elements having atomic number greater than 83 can undergo nuclear fusion. False
(Natural Radioactivity)
24. Nuclear fusion is more dangerous than nuclear fission. True
25. Natural uranium U-238 is the core fuel used in a nuclear reactor. False (U-235)
26. If a moderator is not present, then a nuclear reactor will behave as an atom bomb.
False(Control rod)
27. During one nuclear fission on an average, 2 to 3 neutrons are produced. True
28. Einsteinโs theory of mass energy equivalence is used in nuclear fission and fusion. True
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