Q. Read the law given below and identify the same:
The mass of any substance liberated from an electrolyte is directly proportional to the quantity of charge passing through the solution.
1) Avogadro's law
2) Faraday's first law of electrolysis
3) Faraday's second law of electricity
4) Kirchhoff's law of electricity
Q. The hottest part in the gas flame is known as the -
1) Luminous Zone
2) Dark zone
3) Blue Zone
4) Non - luminous zone
Q. A capacitor (condenser) is used in an electrical circuit to -
1) Step down voltage
2) Step up voltage
3) Store electric charge
4) Produce electric charge
Q. The most malleable metal is -
1) Platinum
2) Silver
3) Iron
4) Gold
Q. An electrical appliance is earthed to -
1) Protect the appliance against any damage
2) Prevent shocks.
3) Reduce consumption
4) Avoid short-circuiting
Q. Though the temperature inside lighted electric bulb is around 2700°C, the filament does not burn because -
1) The metal of which is made up of resistant burning
2) The oxygen necessary for combustion (burning) is not available as the bulb is evacuated and Filled with pure nitrogen or inert gas
3) It cannot burn in closed systems
4) It is made of a non-metallic substance
Q. When an electric bulb breaks, there is a mild bang due to -
1) The chemical reaction between the enclosed gases
2) The compressed gases rushed out suddenly
3) The air rushing in to fill the evacuated space
4) Some other reason
Q. A person weight more in a lift which is -
1) Moving up with a constant velocity
2) Moving down with a constant velocity
3) Accelerating upward
4) Accelerating downward
Q. On a night when the sky is clear, the temperature may dip considerably; on a cloudy night, the temperature will usually dip much less. The reason for this difference is that -
1) the clear sky allows radiant energy to escape readily from the earth
2) on a cloudy night, the clouds are warm and therefore retard the cooling
3) the clear sky allows the cold of outer space to reach the earth
4) currents of air carry the heat away from the earth on a clear night
Q. The most commonly used metal in the pure form or as an alloy in domestic appliances is -
1) Aluminium
2) Iron
3) Copper
4) Zinc
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