Q. Which of the following is not an example of doing work against gravity?
1) Child pulls a toy car
2) Lifting of a baby from the floor
3) Lifting of the weights by a weightlifter
4) Working of a lift by an electric motor
Q. Solar energy is converted into electric energy through -
1) Photo voltaic cells
2) Leclanche cells
3) Voltaic cells
4) Dry cells
Q. Thermodynamically the most stable form of carbon is -
1) Diamond
2) Graphite
3) Graphite
4) Coal
Q. Which of the following materials is most elastic?
1) Iron
2) Rubber
3) Plastic
4) Steel
Q. The unit of frequency is -
1) Hz
2) Kilo Hz
3) Hz/Sec
4) Kg Hz/Sec
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
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