An immersion heater of 400 watts kept on for 5 hours will consume electrical power of __________________?

Related Mcqs:

1. A 10Ω electric heater is connected to a 220V 50Hz mains supply. What is the peak value of the potential difference across the heater element ?

   A. 220V
   B. 220/ 2V
   C. 110V
   D. 220 √2V

2. The average power and instantaneous power become equal if work is done at __________________?

   A. any rate
   B. at variable rate
   C. at uniform rate
   D. at high rate

3. All electrical appliances are connected in parallel to each other between the main line and neutral wire to get ______________________?

   A. same current
   B. same current and potential difference
   C. different current but same potential difference
   D. different current and potential differences

4. Electrical energy is measured in___________________?

   A. watt
   B. horse power
   C. kilo watt
   D. kilowatt hour

5. Electrical energy is converted to heat at the rate of___________________?

   A. IRt
   B. I2R
   C. I2Rt
   D. VIt

6. A magnetic compass will be deflected if it is kept near a____________________?

   A. charge in motion
   B. charge at rest
   C. both
   D. none

7. Why the needle of iron swims on water surface when it is kept gently ?

   A. It will remain under the water, when it will displace more water than its weight
   B. the density of needle is less than that of water
   C. due to surface tension
   D. due to its shape

   Submitted by: Abid Hussain

8. The mass of Platinum cylinder kept near Paris is________?

   A. 1 gram
   B. 1 Kg
   C. 100 Kg
   D. None

   Submitted by: Zahid Jagirani

9. The number of significant figures in 5.400 is________________?

   A. 3
   B. 5
   C. 2
   D. None

10. Three equal resistors connected in series with a source of e m f together dissipate 10 W of power each. What will be the power dissipated if the same resistors are connected in parallel across the same source of e m f ?

    A. 40 W
    B. 90W
    C. 100W
    D. 120W