Posted On : 22-Mar-2018

Q1: Which one among the following is the correct order of power consumption for light of equal intensity?

• A. CFL tube < Fluorescent tube < Incandescent bulb < Light emitting diode
• B. Light emitting diode < CFL tube < Fluorescent tube < Incandescent bulb
• C. CFL tube < Fluorescent tube < Light emitting diode < Incandescent bulb
• D. Incandescent bulb < Light emitting diode < Fluorescent tube < CFL tube

Q2: In India, distribution of electricity for domestic purpose is done in the form of

• A. 220 V; 50 Hz
• B. 110 V; 60 Hz
• C. 220 V; 60 Hz
• D. 110 V; 50 Hz

Q3: When an electrical safety fuse is rated (marked) as 16 A, it means it

• A. will not work if current is less than 16 A
• B. has a resistance of 16 ?
• C. will work if the temperature is more than 16?C
• D. will be blown (break) if current exceeds 16 A

Q4: The main power supply in India is at 220 V, whereas that in the US is at 110 V. Which one among the following statements in this regard is correct?

• A. 110 V is safer but more expensive to maintain
• B. 110 V is safer and cheaper to maintain
• C. 110 V leads to lower power loss
• D. 110 V works better at higher latitudes

Q5: Kilowatt-hour is the unit of

• A. potential difference
• B. electric power
• C. electric energy
• D. electric potential

Q6: The material used for electric fuse is an alloy of tin and lead. This alloy should have

• A. high specific resistance and low melting point
• B. low specific resistance and high melting point
• C. low specific resistance and low melting point
• D. high specific resistance and high melting point

Q7: If two conducting spheres are separately charged and then brought in contact:

• A. the total energy of the two spheres is conserved
• B. the total charge on the spheres is conserved
• C. both the total energy and charge are conserved
• D. the final potential is always the mean of the original potential of the two spheres

Q8: Two pieces of metallic wire having equal length and equal volume placed in air have different resistances. The two wires must:

• A. have different cross sections
• B. have different temperatures
• C. be of different materials
• D. be of same density

Q9: If a heater coil is cut into two equal parts and only one part is used in the heater, the heat generated will be:

• A. doubled
• B. four times
• C. one-fourth
• D. halved

Q10: A hollow metal ball carrying an electric charge produces no electric field at points:

• A. outside the sphere
• B. on its surface
• C. inside the sphere
• D. only at the centre