X
Email me Daily Riddles
Question:- Suitable impurities are added to a semiconductor depending on its use. This is done in order to A. increase its life B. enable it to withstand higher voltages C. increase its electrical conductivity D. increase its electrical resistivity
Answer:- Option C
Question:- It takes much longer to cook food in the hills than in the plains, because A. in the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100oC causing an increase in cooking time B. due to low atmospheric pressure on the hills, the water boils at a temperature higher than 100oC and therefore water takes longer to boil C. in the hills the atmospheric density is low and therefore a lot of heat is lost to the atmosphere D. in the hills the humidity is high and therefore a lot of heat is absorbed by the atmosphere leaving very little heat for cooking
Answer:- Option A
Question:- Moment of inertia is A. vector B. scalar C. phasor D. tensor
Answer:- Option D
Question:- Inside an aeroplane, flying at a high altitude, A. the pressure is the same as that outside B. normal atmospheric pressure is maintained by the use of air pumps C. the pressure inside is less than the pressure outside D. normal humidity and partial vacuum are maintained
Answer:- Option B
Question:- Sound travels with a different speed in media. In what order does the velocity of sound increase in these media? A. Water, iron and air B. Iron, air and water C. Air, water and iron D. Iron, water and air
Answer:- Option C
Question:- One thousand microns is equal to A. 10-3m B. 10-6m C. 10-9m D. 10-12m
Answer:- Option A
Question:- Sound travels at the fastest speed in A. steel B. water C. air D. vacuum
Answer:- Option A
Question:- oil raise up the wick in a lamp. The principle involves A. the diffusion of oil through the wick B. the liquid state of oil C. capillary action phenomenon D. volatility of oil
Answer:- Option C
Question:- Superconductors are substances which A. conduct electricity at low temperature B. offer high resistance to the flow of current C. offer no resistance to the flow of electricity D. conduct electricity at high temperatures
Answer:- Option C
Question:- Light travels at the fastest speed in A. glass B. water C. hydrogen D. vacuum
Answer:- Option D
Question:- Railway tracks are banked on curves A. necessary centrifugal force may be obtained from the horizontal component weight of the train B. to avoid frictional force between the tracks and wheels C. necessary centripetal force may be obtained from the horizontal component of the weight of the train D. the train may not fly off in the opposite direction
Answer:- Option C
Question:- On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because A. metals have higher thermal capacity than plastics B. plastics have a lower density than metals C. metals are good conductor of heat D. plastics have a higher thermal conductivity than metals
Answer:- Option C
Question:- Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons? A. 1.8 km, 0.15 km B. 2.2 km, 0.20 km C. 2.8 km, 0.25 km D. 3.3 km, 0.30 km
Answer:- Option D
Question:- Intensity of sound at a point is ____ its distance from the source. A. directly proportional to B. inversely proportional to C. directly proportional to square of D. inversely proportional to square of
Answer:- Option D