Light, Heat, Thermodynamics, Wave Motion, Sound, Optics & Oscillations - Category Wise Question And Answer Practice Test With Solutions

Question : 11 [UPPCS (Mains) 2013]

Which one of the following does a TV remote control unit use to operate a TV set?

a) Sound waves

b) Micro waves

c) Light waves

d) Radio waves

Question : 12 [UP (Pre) 2013]

An air bubble in water will act like a

a) Concave mirror

b) Convex lens

c) Convex mirror

d) Concave lens

Question : 13 [UPPCS (Pre) 1997]

In cold countries, alcohol is preferred to mercury as a thermometric liquid because

a) Alcohol is a better conductor of heat

b) Alcohol is cheaper than mercury

c) Alcohol has a lower freezing point

d) The world production of alcohol is greater than that of mercury

Question : 14

Which of the following parts of eye protects the eye and gives it shape?

a) Yellow spot

b) Choroid

c) Sclera

d) Ciliary muscles

Question : 15 [UPPCS (Pre) 2013]

Red light is used in traffic signals because

a) It is visible to people even with bad eyesight

b) It is beautiful

c) It has the longest wavelength

d) None of the above