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1471. Moon has no atmosphere because :
A. it is quite far off
B. it does not have any living being
C. its surface is not smooth
D. root mean square velocity of all gases is more than their escape velocity on moons surface
Explanation:
1472. A crystal capable of absorbing a radiation and re-emitting it in the form of visible light, does so after a certain small time interval of excitation. This phenomenin is called :
A. phosphorescence
B. fluorescence
C. photolysis
D. absorption
Explanation:
1473. Of the following, the one representing a phsical change is the :
A. rushing of iron
B. freezing of water
C. burning of coat
D. souring of cream
Explanation:
1474. What should be done to increase the pitch of a string instrument ? 1. Increase the length of the string used.2. Decrease the guage of the string used 3. Loosen the string4. Tighten the string
A. 1 and 4
B. 2 and 4
C. 1, 2 and 4
D. 1 and 3
Explanation:
1475. The sun is visible a little before it rises on the horizon and a little after is sets below the horizon. This is a consequence of the phenomenon of :
A. refraction
B. total internal reflection
C. dispersion
D. scattering of suns light
Explanation:
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