1). Semiconducting property of silicon is due to
A). its positive temperature coefficient of resistance |
B). its negative temperature coefficient of resistance |
C). wide band gap |
D). narrow band gap |
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2). Light from the sun reaches the earth in
A). 45 minutes |
B). 8 minutes |
C). 4 minutes |
D). 2 minutes |
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3). Which of the following is used in electric heaters and irons?
A). Tungsten |
B). Steel |
C). Copper |
D). Nichrome |
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4). witch one of the following instruments is used to measure the speed of water through a pipe?
A). McLeod gauge |
B). pressure gauge |
C). Screw gauge |
D). Venturimeter |
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5). The distance of stars is measured by the unit
A). Kilometer (km) |
B). Angstrom (A) unit |
C). Light year |
D). Giga metre |
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6). Theory of relativity was proposed by which one of the following scientists in the year 1905?
A). Rutherford |
B). Thomson |
C). Bohr |
D). Einstein |
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7). The moderator used in the nuclear reactor at Madras atomic power station in Kalpakkam is
A). Water (H2O) |
B). Graphite |
C). Heavy Water(D2O) |
D). None of these |
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8). Radio carbon In nature Is produced as a result of
A). the action of UV rays on ordinary carbon |
B). the action of IR rays on Ordinary carbon |
C). the action of cosmic rays on earth's atmospheric nitrogen |
D). the action of X-rays on ordinary carbon |
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9). The speed of sound is higher in which one of the following mediums?
A). Liquids |
B). Solids |
C). Gases |
D). Same in all |
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10). The huge amount of energy released in nuclear fission and fusion reactions is due to the conversion of
A). chemical energy into heat energy |
B). protons into neutrons |
C). mass into energy, according to Einstein's equation |
D). mechanical energy into heat energy |
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