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1516. Tiredness is felt on the top of the mountains because of :
A. high temperature
B. low temperature
C. high pressure outside the body
D. low pressure outside the body
Explanation:
1517. As a man moves directly away from a steady source of sound at constant speed, the sounds he hears will :
A. remain constant in both pitch and loudness
B. stay constant in pitch but decreases in loudness
C. increases in frequency and intensity
D. decrease in frequency and intensity
Explanation:
1518. If a body starts its motion from a point and comes back to its initial position after a certain time then since :
A. its displacement is zero, average velocity is zero
B. its displacement is zero average speed is zero
C. total distance travelled is not zero, average speed is zero
D. total distance travelled is zero, average velocity is not zero
Explanation:
1519. It takes much longer to cook things in the hills than in the plains, because :
A. atmospheric pressure is high in the hills and water boils at a higher temperature
B. atmospheric pressure is lower and water boils at a lower temperature
C. due to low atomspheric pressure in the hills the boiling point of water is raised and therefore water takes longer to boil
D. the humid atmosphere in the hills absorbes a lot of heat, leaving very little for the cooking.
Explanation:
1520. Usually light travels faster than sound. However, when we switch a television set on the picture comes later than the sound. The reason is that :
A. in TV transmission sound is transmitted first and picture is transmitted later
B. there is always a delay in the picture tube getting switched on
C. Emission of electrons from the picture tube takes time
D. The wiring for picture tube is much longer compared to that for the speaker
Explanation:
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