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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