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131) Which of the following types of radiation is absorbed by the upper layer of the atmosphere?
(a) Radio-waves
(b) Infrared
(c) Visible
(d) Ultraviolet
132) After long periods of use, a gray spot develops on the inside of a bulb. This is because:
(a) The tungsten filament evaporates and collects there
(b) The heat of the bulb scorches the glass at the top
(c) Dust inside the bulb condenses on the top
(d) Glass undergoes a change due to the heat
133) Approximately, how many times each day do our heart valves open and close normally?
(a) 10,000
(b) 1,00,000
(c) 1,50,000
(d) 2,00,000
134) A nuclear reactor harnesses nuclear energy by:
(a) Nuclear fusion
(b) Spontaneous fission
(c) Uncontrolled chain reaction
(d) Controlled chain reaction
135) Which one of the following raw materials is used in the manufacture of foam used in mattresses, cushions, etc.?
(a) Methanol
(b) Ethanol
(c) Urea
(d) Phenol
136) Permanent magnets can be made from:
(a) Cobalt
(b) Aluminum
(c) Nickel
(d) Lead
137) Atmospheric pressure exerted on the earth is due to the:
(a) Rotation of the earth
(b) Revolution of the earth
(c) Gravitational pull
(d) Uneven heating of the earth
138) Quantity of fresh air required for a man is:
(a) 1000 cubic feet of air for every 20 minutes
(b) 1000 cubic feet of air for every 20 seconds
(c) 1000 cubic feet of air for every 10 minutes
(d) 1000 cubic feet of air for every 10 seconds
139) Where does the oxygen that keeps us alive come from?
(a) Carbon dioxide
(b) Carbonates absorbed from the soil
(c) Oxides of minerals
140) Which one of the following metals pollutes the air of a city having a large number of automobiles?
(a) Cadmium
(b) Chromium
(c) Lead
(d) Copper
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