Across
- 4. I am a necessary evil
- 8. I am measured in dynes by some and pounds by others
- 13. Defining quality of an object that does not let light pass through it
- 14. Measured using mercury column in a capillary tube
- 16. Simply suspended bob on a thread
- 17. Phenomenon of biological bodies emanating light
- 19. I am a region of total darkness
- 20. Used to weigh objects
Down
- 1. In a simple pendulum, potential energy is converted to _________ energy and vice versa
- 2. The distance from a person's nose to the stretched thumb of a sideways stretched arm
- 3. Simplest possible camera consisting of a tiny orifice in a box
- 5. I occupy space and have mass
- 6. This physical quantity increases with ocean depth
- 7. A spiral inclined plane
- 9. I am the smallest unit of a compound substance
- 10. I have both magnitude and direction
- 11. Ferrosoferric oxide has this property
- 12. Ancient mechanism to tell time during the day
- 15. A fixed point or an axis about which a machine turns in doing mechanical work
- 18. There are 604800 of these in a week