1. What is called ability of doing work by a body? 21. What is light?a) Work c) Energy a) Vibration of a particle c) Elastic matter

b) Power d) Force b) Form of energy d) Particle with mass2. Which one is the unit of Energy? 22. What kind of wave is light?

a) Watt c) Newton a) Mechanical c) Electromagneticb) H.P d) Joule b) Longitudinal d) Sound wave

3. Which one is the S, I unit of heat? 23. What type of reflection takes place in smooth surface?a) 00.42 c) 4.2 a) Regular c) Diffusedb) 42 d) 746 b) Parallel d) converged

4. What is heat? 24. The ray which falls on the reflector is knows as-a) One kind of energy a) reflected ray c) incident rayb) Gives sensation of hotness b) normal d) point of incidencec) Gives sensation of coldnessd) Above all 25. The angle on incidence is always equal to which one?

5. What is called the temperature at which a) Angle of refraction c) Angle of reflectionwater can co-exist as ice, water and water vapour? b) Angle of incidence d) Angle of normala) Curie pointb) Triple pointc) Absolute temperatured) Dilute point

6. How many scales are available to measure temperature?a) 2 c) 3b) 4 d) 5

7. The value of freezing point in Fahrenheit scale is – a) 0°F c) 0°Cb) 212°F d) 32°F

8. Sound wave is one kind of-a) Mechanical waveb) Magnetic wavec) Electromagnetic waved) Chemical wave

9. Wave transfers- from one place to another.a) Pressure c) workb) Power d) energy

10. Crest and trough forms in which type of wave?a) Longitudinal waveb) Transverse wavec) Magnetic waved) Chemical wave

11. How many types of wave are there?a) Two c) Threeb) Four d) Five

12. The time required for one complete vibration is calleda) Frequency c) time periodb) Phase d) amplitude

13. What is the unit of time period?a) Sb) Ms-1

c) S-1

d) Hz14. 1 Hz = 7

a) 3.14s-1

b) 2s-1

c) 1s-1

d) 1s-2

15. Which is the S.I unit of frequency?a) Hz c) Pascalb) Cycle d) None

16. What is produce due to the vibration of a particle?a) Sound c) Chemical energyb) Light d) Heat

17. What is Echo?a) Refraction of soundb) Rarefaction of soundc) Reflection of soundd) None

18. What can determine the depth of a well by using which one?a) Reflection c) Refractionb) Echo d) Refractive index

19. Using ultrasonic waves which animal can fly in darkness?a) Dog c) Spiderb) Bat d) Rat

20. What is the speed of sound at 0°C?a) 350ms-1

b) 308ms-1

c) 356ms-1

d) 332ms-1