Physics
The force that binds the neutrons and protons in a nucleus is called as:

Electromagnetic Force
Weak Nuclear Force
Gravitational Force
Strong Nuclear Force

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Physics
Absolute Zero is defined as

At which the volume becomes zero
At which water boils at 298K
The temperature at which all molecular motion ceases
At which liquid Helium boils

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Physics
Planets are

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

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