General Science – Exercise – 3

116. ‘No two electrons in an atom can have the same set of four quantum numbers’ is

(a) Newton’s law
(b) Bohr’s law
(c) Aufbau principle
(d) Pauli’s exclusion principle

117. Optic fibres are mainly used for which of the following?

(a) Musical instruments
(b) Food industry
(c) Weaving
(d) Communication

118. Which of the following is used for removing air bubbles from glass during its manufacture?

(a) Arsenous oxide
(b) Potassium carbonate
(c) Soda ash
(d) Feldspar

119. Gypsum is added to cement clinker to

(a) increase the tensile strength of cement
(b) decrease the rate of setting of cement
(c) facilitate the formation of colloidal gel
(d) bind the particles of calcium silicate

120. What are the soaps?

(a) Salts of silicates
(b) Mixture of glycerol and alcohols
(c) Sodium or potassium salts of heavier fatty acids
(d) Esters of heavy fatty acids

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