Physics
Radio telescopes are better than optical telescopes because

they can detect faint galaxies which no optical telescope can
they can work during the day and night
All of these
they can work even in cloudy conditions

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Physics
Which of the following is not a property of heavy water ?

Freezing point of heavy water is higher than that of ordinary water
Density of heavy water is higher than that of ordinary water
It produces corrosion
Boiling point of heavy water is lower than that or ordinary water

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