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1606. Arrange the following metals in the decreasing order of their relative abundance in earths crust after aluminium : 1. Calcium 2. Iron 3. Sodium 4. Magnesium
A. 1, 4, 2, 3
B. 1, 2, 4, 3
C. 2, 1, 3, 4
D. 2, 1, 4, 3
Explanation:
1607. Which of the following statements about a refrigerator is/are correct ? 1. It converts electrical energy into heat energy. 2. It converts electrical energy into mechanical energy. 3. It transfers heat from a high temperature to a low temperature. 4. It transfers heat from a low temperature to a high temperature.
A. 1 and 3
B. 2 and 3
C. 1 and 4
D. 4 only
Explanation:
1608. AC cannot be used in
A. Amplifier
B. Transformer
C. Voltmeter
D. Galvanometer
Explanation:
1609. Rectifiers are used to convert
A. low voltage to high voltage
B. high voltage to low voltage
C. D.C to A.C.
D. A.C. to D.C.
Explanation:
1610. A substance which changes readily into vapour without heating is called
A. efflorescent
B. synthetic
C. volatile
D. effervescent
Explanation:
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