Physics miscellaneous
- Full form of CFL used in place of electric bulbs is
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A compact fluorescent lamp (CFL) is a fluorescent lamp designed to replace an incandescent lamp; some types fit into light fixtures formerly used for incandescent lamps.
Correct Option: A
A compact fluorescent lamp (CFL) is a fluorescent lamp designed to replace an incandescent lamp; some types fit into light fixtures formerly used for incandescent lamps.
- The wall of a dam is made thicker at the bottom than at the top because the pressure exerted by the water on the wall
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Higher water pressure on the base of the dam needs greater strength to hold it back.
Correct Option: C
Higher water pressure on the base of the dam needs greater strength to hold it back.
- Convex mirrors are used as a rear view mirror in motor cycles because
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It is because image formed by an convex mirror is always virtual, erect and smaller than the object.
Correct Option: C
It is because image formed by an convex mirror is always virtual, erect and smaller than the object.
- If cream is removed from milk, its density
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The density of pure fresh milk being on the average 1.032, while the density of fat globules is about 0.86. It follows that the removal of cream will increase the density, while the addition of water will decrease it.
Correct Option: A
The density of pure fresh milk being on the average 1.032, while the density of fat globules is about 0.86. It follows that the removal of cream will increase the density, while the addition of water will decrease it.
- A drop of liquid assumes spherical shape because:
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A drop of liquid assumes spherical shape because a sphere has the least surface area for a given volume.
Correct Option: B
A drop of liquid assumes spherical shape because a sphere has the least surface area for a given volume.
