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1356. Which of following is an element ?
A. Ruby
B. Sapphire
C. Emerald
D. Diamond
Explanation:
1357. According to the law of conservation of energy, 1. energy can be created but not destroyed 2. energy can neither be created nor destroyed 3. energy can be transformed from one form to the other
A. 1 only
B. 2 only
C. 2 and 3
D. 3 only
Explanation:
1358. Fish plates in railway track are used
A. to join two coaches
B. to connect two rails
C. to guide the wheels of coach
D. Both (B) and (C) above
Explanation:
1359. Which of the following is not correctly matched ?
A. Galena : Lead sulphide
B. Green vitriol : Copper sulphate
C. Plaster of Paris : Calcium sulphate
D. Calomel : Mercurous chloride
Explanation:
1360. The quality of a sound depends upon the : 1. size of the vibrating body2. material of the vibrating body3. overtones produced 4. shape of the vibrating body
A. 1, 2 and 3
B. 1, 2, 3 and 4
C. 1 and 3
D. 2, 3 and 4
Explanation:
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