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151) What is the average adult pulse rate?
(a) 150 BPM
(b) 115 - 125 BPM
(c) 72 - 80 BPM
(d) 60 - 100 BPM
152) The beautiful color pattern exhibited by a peacock in its tail feathers are due to ______.
(a) Selective absorption of light
(b) Selective reflection of light
(c) Interference of light
(d) Natural colour pattern of feathers
153) A lake starts freezing because of the cold atmosphere. It will first freeze ______.
(a) At the bottom
(b) In the middle part
(c) At the top surface
(d) Uniformly throughout the water body
154) The sun appears red at sunrise and sunset while it appears white at noon, because ______.
(a) Of refraction
(b) Its colour at sunrise and sunset
(c) Of diffraction leading to the red end of the spectrum reaching the earth
(d) Of scattering of light due to dust particles and air molecules
155) When a person enters a dark room from bright light he is not able to see clearly for a little while because the ______.
(a) Eye is unable to adjust itself immediately
(b) Retina becomes insensitive momentarily
(c) Iris is unable to dilate the pupil immediately
(d) Distance between the lens and retina take time to adjust
156) Haemoglobin in the blood is a complex protein rich in ______.
(a) Copper
(b) Iron
(c) Silver
(d) Zinc
157) An astronaut inside a spacecraft is in a state of weightlessness. This implies that ______.
(a) The mass of the astronaut is reduced to zero
(b) Gravity inside the spacecraft ceases to act
(c) The astronaut is outside the influence of the earth’s gravitational force
(d) The astronaut and the spacecraft are both in a free-falling state
158) An iceberg is floating in the sea. How much of its mass will remain above the surface of water?
(a) One tenth
(b) One fifth
(c) One fourth
(d) One third
159) Most of the ozone in the atmosphere is concentrated in the ______.
(a) Mesosphere
(b) Troposphere
(c) Stratosphere
(d) Ionosphere
160) The cow's milk contains how much amount of water in terms of percentage?
(a) 60%
(b) 65%
(c) 72%
(d) 87%
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