Physics Cloudy nights are warmer compared to clear cloudless nights, because clouds mainly Absorb heat from the atmosphere send it towards earth Reflect back the heat given by earth Prevent cold waves from the sky descending on earth Produce heat and radiate it toward earth Absorb heat from the atmosphere send it towards earth Reflect back the heat given by earth Prevent cold waves from the sky descending on earth Produce heat and radiate it toward earth ANSWER DOWNLOAD EXAMIANS APP
Physics The ''Greenhouse effect' is mainly due to increase in atmospheric Ozone Carbon dioxide Sulphur dioxide Nitrogen Ozone Carbon dioxide Sulphur dioxide Nitrogen ANSWER DOWNLOAD EXAMIANS APP
Physics When two semiconductors of pand n-type are brought in contact, they form p-n junction which acts like a/an Oscillator Conductor Rectifier Amplifier Oscillator Conductor Rectifier Amplifier ANSWER DOWNLOAD EXAMIANS APP
Physics In an optical fibre the signal is transmitted Due to refraction Due to total internal reflection In a curved path In a straight line path Due to refraction Due to total internal reflection In a curved path In a straight line path ANSWER DOWNLOAD EXAMIANS APP
Physics A convex mirror of focal length f (in air) is immersed in a liquid (u=4/3). The focal length of the mirror in the liquid will be : (4/3)f (3/4)f (7/3)f F (4/3)f (3/4)f (7/3)f F ANSWER DOWNLOAD EXAMIANS APP
Physics An oil drop spreads over water because Oil is more viscous water has a higher surface tension Oil is lighter than water Oil does not mix with water Oil is more viscous water has a higher surface tension Oil is lighter than water Oil does not mix with water ANSWER DOWNLOAD EXAMIANS APP
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