Physics
A bucket of water is hung from a spring balance. A piece of iron is suspended in the water without touching the sides or touching the bottom of the bucket. The reading of the spring balance

Does not change
Will increase
Varies with the increase of depth of the immersion of the iron piece
Will decrease

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Physics
Planets are

luminous heavenly bodies revolving around a star
luminous heavenly bodies that twinkle
luminous heavenly bodies that do not twinkle
non-luminous heavenly bodies

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Physics
A drop of liquid assumes spherical shape because:

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

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