Physics
Planets are

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

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Physics
Superconductors are substances which

offer high resistance to the flow of current
conduct electricity at high temperatures
conduct electricity at low temperature
offer no resistance to the flow of electricity

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Physics
To resolve an object in an electron microscope,

Both A & B
The wavelength of the electrons must be close to the diameter of the object
The wavelength of the electrons must be greater than the diameter of the object.
None of these

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