Q. Horsepower is equal -
1) 776 watts
2) 746 watts
3) 11,000 volts
4) None of the above
Q. The best electrical conductor among the following is -
1) Gold
2) Copper
3) Aluminum
4) Silver
Q. Which of the following does not involve Total Internal Reflection?
1) Mirages in Deserts
2) Kaleidoscope
3) Diamond Sparkle
4) Transmission of light rays in Optical Fibres
Q. For a wave, wavelength divided by the time period is equal to -
1) phase difference
2) frequency
3) wave velocity
4) amplitude
Q. The unit of electrical resistance -
1) ampere
2) volt
3) coulomb
4) ohm
Q. Which one of the following substances is the hardest?
1) Dimond
2) Brass
3) Steel
4) Iron
Q. Which instrument is used to measure electric current?
1) Voltmeter
2) Ammeter
3) Electrometer
4) Hydrometer
Q. Which of the following is a good conductor of electricity?
1) P.V.C
2) Glass
3) Rubber
4) Graphite
Q. An electric motor converts -
1) electrical energy into heat energy
2) electrical energy into mechanical energy
3) mechanical energy into electrical energy
4) mechanical energy into heat energy
Q. The resistance of metallic conductors -
1) increases with rising in temperature
2) decreases with rising in temperature
3) remains unchanged with change in temperature
4) becomes zero at very high temperature
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