General Science – Exercise – 2

76. Detergents used for cleaning clothes and utensils contain?

(a) bicarbonates
(b) bismuthates
(c) sulphonates
(d) nitrates

77. Atoms are composed of

(a) electrons and protons
(b) electrons only
(c) protons only
(d) electrons and nuclei

78. Which of the following is used as a moderator in nuclear reactor?

(a) Thorium
(b) Graphite
(c) Radium
(d) Ordinary water

79. Isotopes are separated by

(a) crystallisation
(b) sublimation
(c) distillation
(d) filtration

80. Which of the following is commonly called a ‘polyamide’?

(a) Terylene
(b) Nylon
(c) Rayon
(d) Orlon

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