Why two thin shirts can keep us warmer than a single thick shirt in winter ?
1). Two thin shirts become thicker so prevent transmission of heat
2). Air layer between two shirts works as good conductor
3). Air layer between two shirts behaves like insulating media
4). No radiation of heat takes place
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1. Natural radioactivity was discovered by
2. The dimension MLT–2 corresponds to
3. The different colours of different stars are due to the variation of
4. Which among the following is false about displacement?
5. Good conductor of electricity is
6. Magnetic keepers are used to protect magnets from :
9. A sphere rolls down on two inclined planes of different angles but same height it does so
10. The force exerted on an object is 200 N and its mass is 100 kg. Find the acceleration of the object.