Physics -Important Points For Various Exams

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1-At what temperature are the temperature on Celsius and Fahrenheit scales equal?
Ans= – 40o Celsius

2-Galvanometer can be converted into a voltmeter by using High resistance in series

3-Kilowatt – hour is a unit of Power

4-The ozone layer protects us from Ultra violet rays

5-Fire in the diesel engine is produced by Compression.

6-Ampere-hour is the unit of Amount of charge .

7-Red, Green, Blue are primary colors.

8-Persistence of vision is the principle behind Cinema .

9-Light from the laser is Monochromatic.

10-Choke is used to reduce the current in AC circuit.

11-At what temperature a body will not radiate any heat energy?
Ans= -273o C

12-Only one part of moon can be seen from earth because the period of rotation and revolution are equal .

13-Parsec is a unit of Astronomical distance .

14-Blisters are formed more rapidly by the steam of boiling water in comparision to boiling water itself because Stream has latent heat.

15-What will be the effect on gravitational acceleration if the earth suddenly stops its
rotation? Ans=It will increase at the poles

16-Ball pen works on the principle of Capillarity and surface tension .

17-Growth of the baby in the uterus is found using Ultra sound.

18-.If a red-green flag is seen in green light it appears to be of which of the following colour? Ans= Black – Green

19-Nichrome wire is used in an electric heater because

a) It has high resistance

b)It can resist a current upto approx 5 amperes

c) It has high melting point

20-.Lightning conductors are made up of Copper

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