Ans: Current and potential difference
2. Where is the value of 'g' will be minimum?
Ans: Equatorial region
3. A glass rod placed in a color less liquid seems to disappear because:
Ans: The glass and the liquid have the same refractive index
4. The main source of energy in the biosphere is:
Ans: Sun
5. The apparent weight of a man in a lift is less than his real weight, when?
Ans: When the lift is going up with uniform acceleration
6. With which instrument the people of submarine can seen objects on the surface of the sea without coming up?
Ans: Periscope
7. Velocity of sound is:
Ans: 330 m/see
8. If a body is moving with uniform velocity what is the acceleration?
Ans: Accelaration will be zero
9. When an object falls freely towards the earth, then its total energy?
Ans: Remains constant
10. The lens used in photo camera:
Ans: Convex lens
11. The speed of sound depends on the through which its travels:
Ans: Nature of materials
12. When a body is thrown upwards the kinetic energy of body is gradually changed into _____?
Ans: Potential energy
13. What name is given to the product of mass and velocity of a body?
Ans: Momentum
14. What is the SI unit of potential difference?
Ans: Volt
15. What does Angstrom measure?
Ans: Length of light waves
16. One calorie is equal to:
Ans: 4.2 J
17. Bolometer measures:
Ans: Heat Radiations
18. Dynamo works on the principle of:
Ans: Electromagnetic Induction
19. If a pendulum clock is taken from equator to poles:
Ans: It will run fast
20. The Worlds first artificial satellite:
Ans: Sputnik
21. Galileo Galilee was an _____ scientist:
Ans: Italian
22. In the cinema we see pictures with natural effect due to which phenomenon:
Ans: Persistence of vision
23. Which force is responsible for the moon revolving around the earth?
Ans: Gravitational force
24. The sum of potential and kinetic energies of a body is called:
Ans: Mechanical energy
25. The loudness of a sound wave is determined by its:
Ans: Amplitude
26. The source of electric energy in an artificial satellite:
Ans: Solar cells
27. Special theory of relativity was proposed in:
Ans: 1905
28. A twinkling of star is due to:
Ans: Refraction
29. The light produced by sodium vapour lamp is:
Ans: Yellow
30. Fuel with highest calorific value is:
Ans: Hydrogen
31. The scientist who study about earthquake is called:
Ans: Seismologist
32. The force that keeps a revolving body to its orbit is:
Ans: Its centripetal force
33. Solar energy is received by the earth through:
Ans: Radiation
34. The reaction in torch cell is ______.
Ans: Electra Chemical
35. Diverging lens produces ______ types of images.
Ans: Small virtual image
36. Tape recorder functions on the principle of?
Ans: Electromagnetic Induction
37. The material used for making solar cell is:
Ans: Silicon
38. 'A brief history of time' was written by:
Ans: Stephen Hawkins
39. The best conductor of electricity is:
Ans: Silver
40. Atom bomb is based on:
Ans: Nuclear Fission
