21) The Laxman Era was started (in 1119 AD) by which dynasty?
Sens
22) Water vapour is turned into water droplets by which process?
Condensation
23) Mirage is observed in a desert due to the phenomenon of which reflection?
Total reflection
24) AT which °C water has full density?
4°C
25) Critical angle of light passing from glass to water is minimum for which colour?
Violet colour
26) What amount of energy transferred from one trophic level to next?
10%
27) Which would expand the most on being heated?
Air
28) A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole?
Decreases
29) What is the phenomenon of splitting white light into seven colours?
Dispersion
30) Critical angle is minimum when a light ray passes which thing?
Glass to air
31) What will be best colours for a Sun umbrella?
White on top and black on inside
32) Why is Weightlessness experienced in spaceship?
Due to absence of gravity
33) Which year is celebrated as International Year of Astronomy?
2009
34) The Resistance of Human body (dry condition) is the order of?
10000 Ohm
35) Newton’s Law of gravitation is defined by?
Newton
36) What is the unit of electrical conductivity?
Mho
37) Who discovered the link between electricity and magnetism?
Michel Faraday
38) Chemical Energy is converted into Electric Energy?
Battery
39) Tesla is the unit of Magnetic?
Induction
40) The substance having infinite electric resistance are called: Insulator