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246. It is obsrved that when glass is heated, it cracks while metal does not. Which of the following statements explains this phenomenon ?
A. Metal is a poor conductor of heat.
B. The expansion of the glass after heating is uniform and therefore it cracks.
C. In case of glass the heat is transmitted quickly when it is heated.
D. Glass is a poor conductor of heat.
Explanation:
247. What is the increasing order of the wavelengths of the following colours ? 1. Orange 2. Indigo 3. Yellow 4. Violet
A. 1, 2, 3, 4
B. 1, 3, 2, 4
C. 3, 1, 4, 2
D. 4, 2, 3, 1
Explanation:
248. Flat bones are found in
A. neck
B. skull
C. legs
D. chest
Explanation:
249. Consider the following statements :If there was no capillarity, 1. it would be impossible to use a kerosene lamp. 2. one would not be able to use a straw to consume a soft drink. 3. the blotting paper would fail to function. 4. there would have been no plants on the Earth.The correct ones are
A. 1, 2 and 3
B. 1, 3 and 4
C. 2 and 4
D. 1, 2, 3 and 4
Explanation:
250. If you float on your back, on water, your weight will be
A. less than the weight of water displaced by you
B. zero
C. half of your normal weight
D. equal to your normal weight
Explanation:
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