Physics
The velocity of sound in moist air is more than in dry air because the moist air has

Less density than dry air.
More density than dry air.
More pressure than dry air.
Less pressure than dry air.

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Physics
A drop of liquid assumes spherical shape because:

Inter molecular forces are weak in liquids
A sphere has the largest surface area for a given volume
Intermolecular forces are strong in liquids
A sphere has the least surface area for a given volume

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Physics
A Fuse wire is characterised by

High resistance and high melting point
Low resistance and low melting point
High resistance and low melting point
Low resistance and high melting point

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