81. A device that converts mechanical energy into electric energy is called
(a) Transformer
(b) Motor
(c) Generator
(d) None of These
82. The drugs caffeine, tannin and nicotine are
(a) Steroids
(b) Cortisones
(c) Alkaloids
(d) None of These
83. The saliva helps in the digestion of
(a) Starch
(b) Fibres
(c) Proteins
(d) None of These
84. Nights are cooler in the deserts because
(a) Sand radiates heat less quickly as compared to the earth
(b) Sand radiates heat more quickly as compared to the earth
(c) The sky is generally clear
(d) None of These
85. Which of the following is not an element of the bone?
(a) Calcium
(b) Phosphorus
(c) Carbon
(d) Oxygen
86. Deficiency of Vitamin C causes
(a) Night Blindness
(b) Rickets
(c) Scurvy
(d) None of These
87. Silk worm eats
(a) Mango
(b) Mangrove
(c) Strawberry
(d) Mulberry
88. Light travels in
(a) Longitudinal Waves
(b) Transverse Waves
(c) Both a and b
(d) None of These
89. Ozone layer prevents which of the radiation from entering the atmosphere?
(a) Ultraviolet
(b) Infrarred
(c) Gamma Rays
(d) X-rays
90. What does blood consists of?
(a) 60% plasma, 40% corpuscles
(b) 40% plasma, 60% corpuscles
(c) 25% plasma, 75% corpuscles
(d) 90% plasma, 10% corpuscles