11
Curiosity
Work, Energy and Simple Machines
250+ practice questions available
Sample Practice Questions
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1
Hard
A ball of mass 1 kg is dropped from 80 m. What is its velocity at 60 m above the ground? (g = 10 m/s²)
A10 m/s
B20 m/s
C40 m/s
D14.14 m/s
2
Easy
For work to be done, there must be:
AOnly a force
BOnly displacement
CBoth a force and displacement in the direction of force
DNeither force nor displacement
3
Easy
In a thermal power plant, the energy transformation is:
AChemical → heat → kinetic → electrical
BElectrical → chemical → heat
CNuclear → light → electrical
DKinetic → potential → electrical
4
Medium
When you eat food and then run, the energy transformation is:
AChemical → kinetic + heat
BKinetic → chemical
CHeat → chemical → kinetic
DLight → chemical → kinetic
5
Easy
Power is defined as:
ATotal work done
BRate of doing work
CForce times distance
DEnergy stored
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