MCQ
Water stored in a dam possesses:
- ANo energy
- BElectrical energy
- CKinetic energy
- DPotential energy
Explanation:
The potential energy possessed by the object is the energy present in it by virtue of its position or configuration. Water stored in a dam , when allowed to flow, has kinetic energy which was earlier stored as potential energy.
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Unicellular organisms take in oxygen and pass out carbon dioxide through:
The gravitational force of attraction between two objects is x. Keeping the masses of the objects unchanged, if the distance between the objects is halved, then the magnitude of gravitational force between them will become:
$\frac{\text{x}}{4}$
$\frac{\text{x}}{2}$
$2\text{x}$
$4\text{x}$