A person trying to lose weight by burning fat lifts a mass of 10 kg upto a height of 1 m 1000 times.  Assume that the potential energy lost each time he lowers the mass is dissipated.  How much fat will he use up considering the work done only when the weight is lifted up ?  Fat supplies 3.8×107 J of energy per kg which is converted to mechanical energy with a 20% efficiency rate.  Take g = 9.8 ms−2 :

Option 1)

2.45×10−3 kg

Option 2)

 6.45×10−3 kg

Option 3)

 9.89×10−3 kg

Option 4)

12.89×10−3 kg

 

Find out the correct meaning of the following phrase

Bite off more than you can chew

  • Option 1)

    To take a huge and difficult task

  • Option 2)

    To eat more than you can digest

  • Option 3)

    To let the expenditure exceed the resources

  • Option 4)

    To work very hard

 

Find out the appropriate words to fill in the blank:

The drunken man teased women and was consequentially ___ by them

  • Option 1)

    Pacified

  • Option 2)

    Appeased

  • Option 3)

    Neglected

  • Option 4)

    Castigated

 

The supply voltage to a room is 120 V. The resistance of the lead wires is 6 \Omega. A 60 W bulb is already switched on. What is the decrease of voltage across the bulb, when a 240 W heater is switched on in parallel to the bulb?

 

  • Option 1)

    10.04 Volt

  • Option 2)

    Zero Volt

  • Option 3)

    2.9 Volt

  • Option 4)

    13.3 Volt

 
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