Cloudy nights are warmer compared nights because clouds mainly
1). absorb heat from the atmosphere send it towards earth
2). prevent cold waves from the sky descending on earth
3). reflect back the heat given by earth
4). produce heat and radiate toward earth
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1. Which one of the following is used for sun glasses
2. The colour of the ocean appears to be blue because the sunlight falling on it is
3. Which waves cannot be transmitted through vacuum?
5. Good conductor of electricity is
6. What is the unit of the physical quantity 'Jerk'?
7. The best material for the core of a transformer is
8. Which of the following is indicated by the colour of a star ?
9. Which of the following produces more severe burns ?
10. The impurity atoms with which silicon should be doped to make p-type semiconductors are