Q. The majority charge carriers in a p-type semiconductor are -
1) free electrons
2) conduction electrons
3) ions
4) holes
Q. Five bulbs each of 100 watt capacity in a tunnel are illuminated continuously for twenty hours. The consumption of electricity will be-
1) One unit
2) Two units
3) Ten units
4) Twenty units
Q. A cut diamond shines brilliantly due to-
1) some inherent property
2) total internal reflection
3) its molecular structure
4) absorption of light
Q. Which one of the following pairs is not correctly matched?
1) Light year - Unit of distance
2) Parsec - Unit of time
3) Decibel - Unit of sound intensity
4) Hertz - Unit of frequency
Q. Which of the following does not require a medium?
1) Radiation
2) Convection
3) Conduction
4) None of these
Q. For every action there is an equal and opposite reaction. This law was given by -
1) Newton
2) Albert Einstein
3) Bohr
4) Handane
Q. Harnessing of nuclear energy often causes -
1) Air Pollution
2) Water Pollution
3) Thermal Pollution
4) Noise Pollution
Q. Stainless Steel is an alloy in which following is added along with iron?
1) Zinc
2) Chromium
3) Tin
4) Copper
Q. Loudness of sound is measured in terms of following -
1) Frequency
2) Amplitude
3) Velocity
4) Wavelength
Q. When a ray of light travels from a denser medium to a rarer medium then -
1) It speeds up and bends away from the normal.
2) It speeds up and bends towards the normal.
3) It slows down and bends away from the normal.
4) It slows down and bends towards the normal.
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