Physics
A capillary tube is partially dipped vertically in a vessel containing water. Due to capillarity water rises in the tube. The height of water rise in the tube can be increased by

Increasing the height of water in the vessel
None of these
Increasing the radius of the capillary tube
Decreasing the radius of the capillary tube

ANSWER DOWNLOAD EXAMIANS APP

Physics
Purpose of an optical filter is to

Reflect lights of different colours
Transmit or absorb light of different colours
Dispense light into component colours
Refract light of different colours

ANSWER DOWNLOAD EXAMIANS APP

Physics
In a railway track, two rails are joined end to end with a gap in between them because

Accidents due to expansion in summer can be avoided
Steel can be saved
Accidents due to contraction in winter can be avoided
Air-gaps are necessary for bearing the weight of running train

ANSWER DOWNLOAD EXAMIANS APP