Q. First electro chemical cell was designed by -
1) Leclanche
2) Faraday
3) Galvanic
4) None of the above
Q. The velocity of sound in any gas depends upon -
1) Wavelength of sound only
2) Density and elasticity of gas
3) Intensity of sound waves only
4) Amplitude and frequency of sound
Q. It is difficult to cook at high altitude because -
1) There is less oxygen in the air
2) Due to fall in temperature, one has to give more heat
3) Due to decrease in atmospheric pressure the boiling point of water decreases
4) Of high moisture content at higher altitude
Q. The poorest conductor of heat among the following is -
1) copper
2) lead
3) mercury
4) zinc
Q. Which of the following does not change when light travels from one medium to another?
1) Velocity
2) Wavelength
3) Frequency
4) Refractive index
Q. 'Light-year' is a unit of -
1) time
2) speed
3) distance
4) intensity of light
Q. Faraday constant -
1) depends on the amount of the electrolyte
2) depends on the current passed in the electrolyte
3) depends on the volume of the solvent in which the electrolyte is dissolved
4) is a universal constant
Q. On heating, the resistance of a semiconductor -
1) increases
2) decreases
3) remains same
4) first increases and then decreases
Q. The total resistance of a circuit having two parallel resistors is 1.403 kilo-ohm. If one of the resistors is 2.0 kilo-ohm, then the other resistor will be -
1) 1.403 kilo-ohm
2) 2.0 kilo-ohm
3) 3.403 kilo-ohm
4) 4.70 kilo-ohm
Q. People prefer to wear cotton clothes in summer season. This is due to the fact that cotton clothes are -
1) good absorbers of water
2) good conveyors of heat
3) good radiators of heat
4) good absorbers of heat
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