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Physics 9 Chapter 6 - Work and Energy - 25
1.
What is the output of a vehicle running on a levelled road with constant speed?
a) Sound energy
b) Work done
c) Heat energy
d) All of these
2.
What is the input for a power station?
a) Potential energy
b) Light energy
c) Heat energy
d) Sound energy
3.
How many outputs are for a power station?
a) Two
b) Three
c) Five
d) One
4.
What is the output of a power station?
a) All of these
b) Heat energy
c) Electric energy
d) Sound energy
5.
Which energy electric motors may be used to pump water?
a) Heat energy
b) Sound energy
c) Light energy
d) Electric energy
6.
Which energy electric motors may be used to drill holes?
a) Heat energy
b) Sound energy
c) Electric energy
d) Light energy
7.
What is the ratio of useful output to input energy called?
a) Efficiency
b) Power
c) Energy
d) Work done
8.
What is the ratio of required form of energy obtained from a system as output to the total energy given to it as input called?
a) Work done
b) Power
c) Efficiency
d) Energy
9.
What is the formula of efficiency?
a) Efficiency = Required form of output / Total input energy
b) Efficiency = Required form of output x Total input energy
c) Efficiency = Total input energy + Required form of output
d) Efficiency = Total input energy / Required form of output
10.
What is the efficiency % of an ideal system?
a) 50%
b) 25%
c) 100%
d) 120%
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