Physics 10 Chapter 14 - Current and Electricity - 29

Physics 10 Chapter 14 - Current and Electricity - 29

1. How many times the current in the bulb fluctuates each second b/w -0.71 A and 0.71 A in a 60 W incandescent light bulb?

a) 100 times
b) 50 times
c) 60 times
d) 71 times

2. What is the amount of energy delivered by a power of one kilowatt in one hour called?

a) Watt-hour
b) Kilowatt-second
c) Kilowatt-hour
d) Horse power

3. What is the value of 1 kWh?

a) 1 kWh = 3.6 × 10⁴ J
b) 1 kWh = 3.6 × 10⁵ J
c) 1 kWh = 36.0 × 10⁵ J
d) 1 kWh = 36.0 × 10⁴ J

4. What is the value of one kilowatt-hour?

a) One kilowatt-hour = 3.6 × 10⁴ J
b) One kilowatt-hour = 3.6 × 10⁵ J
c) One kilowatt-hour = 36.0 × 10⁴ J
d) One kilowatt-hour = 36.0 × 10⁵ J

5. What is the value of 1 kWh?

a) 1 kWh = 3.6 MJ
b) 1 kWh = 366.0 MJ
c) 1 kWh = 36.6 MJ
d) 1 kWh = 0.36 MJ

6. What is the formula for finding the amount of energy in kilowatt-hour?

a) Formula = (Watt x time of use in seconds) / 1000
b) Formula = (Watt x time of use in seconds) / 100
c) Formula = (Watt x time of use in hours) / 1000
d) Formula = (Watt x time of use in hours) / 100

7. In which units, the electric meter installed in our houses measures the consumption of electric energy?

a) Kilowatt-hour
b) Watt-second
c) Watt-hour
d) Kilowatt-second

8. What is the formula for finding the cost of electricity?

a) Cost of electricity = (Units consumed x Cost of one unit)/1000
b) Cost of electricity = Units consumed x Cost of one unit
c) Cost of electricity = Units consumed x Cost of ten units
d) Cost of electricity = (Units consumed x Cost of one unit) / 100

9. Calculate the one month cost of using 50 W energy saver for 8 hours daily in your study room. Assume that the price of a unit is Rs. 12?

a) Rs. 80
b) Rs. 144
c) Rs. 124
d) Rs. 96

10. A light bulb is switched on for 40 s. If the electrical energy consumed by the bulb during this time is 2400 J, find the power of the bulb?

a) 60 W
b) 960 W
c) 120 W
d) 96000 W

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