61) Retina of the eye is comparable to which part of a traditional camera?
Lens
62) If we move from the equator to a pole, what will be the value of g?
Increases
63) What does TV remote control unit use to operate a TV set?
Radio waves
64) Which glass is used in bullet proof screens?
Reinforced glass
65) Rutherford’s scattering experiment related to the size of which thing?
Nucleus
66) It a spoon is to be electroplated with nickel the spoon is?
Made spoon cathode and pure nickel rod anode
67) The threshold frequency is the frequency below which?
Photoelectric emission is not possible
68) Soldering of two metals is possible due to the property?
Cohesion
69) Rate of cooling depends upon which factor?
Temperature difference between body and its surrounding
70) Why clouds are float in atmosphere?
Low density
71) Cryogenic Science is related to?
Lower temperature
72) Ice is packed in sawdust because?
Sawdust is a poor conductor of Heat
73) What is the motion which repeated in self after a regular interval of time?
Simple harmonic motion
74) When water freezes its density is?
Decreases
75) Ball pen act on the principle of?
Gravitation
76) What is the growth movement in plant due to light called?
Phototropism
77) Foucault experiment is proof of which body?
Rotation of Earth
78) In which the radiant energy of the sun is transmitted?
Short waves
79) When can one record the lowest temperature of air?
Just before sunrise
80) What happens when the water content in the atmosphere?
Decreases as temperature increases