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Exercise:

Section 1

► Section 2

01. The heat required to raise the temperature of body by 1 K is called
A. specific heat B. thermal capacity
C. water equivalent D. None of the above

Answer and Explanation

Answer: thermal capacity

Explanation:
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02. The luster of a metal is due to:
A. Its high density B. Its high polishing.
C. Its chemical inertness. D. Presence of free electrons.

Answer and Explanation

Answer: Presence of free electrons.

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03. The nucleus of an atom consists of
A. electrons and neutrons B. electrons and protons
C. protons and neutrons D. All of the above

Answer and Explanation

Answer: protons and neutrons

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04. The method that cannot be used for removing permanent hardness of water is
A. adding sodium carbonate B. distillation
C. adding caustic soda D. boiling

Answer and Explanation

Answer: boiling

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05. The hardest form of carbon is
A. coke B. graphite
C. diamond D. charcoal

Answer and Explanation

Answer: diamond

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06. Among the following which law states that the amount of gas dissolved in a liquid is proportional to its partial?
A. Henry’s law. B. Raoult’s law.
C. Dalton’s law. D. Gay Lussac’s law.

Answer and Explanation

Answer: Henry’s law.

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07. The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth;s early life and solidified into hard rock's called
A. granite B. basalt
C. igneous rocks D. sedimentary rocks

Answer and Explanation

Answer: igneous rocks

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08. The metallurgical process in which a metal is obtained in a fused state is called
A. smelting B. roasting
C. calcinations D. froth floatation

Answer and Explanation

Answer: smelting

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