We prefer to wear dark clothes in winter because they absorb the heat and keep the body warm. However, white clothes are good reflectors of heat and are worn in summer.
Simla is colder than Delhi because it is situated at a higher altitude and temperature decreases by 1°C for every 165 metres of ascent
When Bangladesh was created after partition of India, the areas of jute production went to Bangladesh while the jute mills were left in India. So, India imports raw jute from Bangladesh.
Eskimos live in snow houses called igloos because snow, being a bad conductor of heat, these houses are warm inside.
Pluto, being farthest from the sun, hardly gets the sun's rays. So, Pluto is the coldest planet.
Diamond is very hard due to its rigid three dimensional structure and so, it is used for cutting glass. Refractive index of diamond is high and gives it the greater transparency and brilliance.
Graphite possesses a layer structure with two successive layers held by weak forces and able to slide over one another. So, graphite is slippery and this property finds its use as a lubricant. In graphite, each carbon atom is linked to three other carbon atoms while one electron in the carbon atom is delocalised. So, graphite has free electrons
When the bus starts, the person inside it falls backward because the bus moves forward but due to the property of inertia, the man tends to be in the initial Mate of rest.
We feel uncomfortable in hut and humid climate because in hot weather, body sweats more but due to high humidity, this sweat does not evaporate easily.
The root nodules of leguminous plants contain certain nitrogen fixing bacteria which absorb the atmospheric nitrogen and convert it into nitrogeneous compounds useful for the plants reviving soil fertility.
The seals found at Indus valley sites gave evidance of overseas trade, which was possible only with the knowledge of art of navigation.
Thus, both A and R are true & R correctly explains A.
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