Choose the correct alternative from the following.
Assertion (A) : Water kept in earthen pots gets cooled in summer.
Reason (R) : Evaporation causes cooling.
Answer: A
Earthen pots have pores through which water evaporates, causing cooling.
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Assertion (A) : Eskimos reside in igloos.
Reason (R) : No other material except snow is available.
Answer: C
Eskimos live in snow house called igloos because snow, being a bad conductor of heat, these houses warm inside.
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Assertion:
Today's youth in India like western music more than Indian classical music.
RI. Western music has strong base than Indian classical music.
RII. Indian classical music is very boring and they like rocking music more.
Answer: D
Hence the given assertion is about the preference of today's youth.
RI is talking about the strong base of western music. Having strong base does not imply that it is good to listen.
RII tells that youth like rocking music but there is no evidence that western music is rocking.\Neither RI nor RII is a reason.
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Assertion (A) : Tamil Nadu gets most of the rainfall in winter.
Reason (R) : Tamil Nadu gets rainfall from retreating monsoons.
Answer: A
Rainfall in Tamil Nadu is caused by the retreating monsoons which occur in winter.
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Assertion (A) : A little gap is left between iron rails.
Reason (R) : Iron expands in summer.
Answer: A
Iron expands in summer. So, gaps are left between rails to allow for expansion.
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Assertion (A) : Plaster of Paris is used by doctors by setting fractured bones.
Reason (R) : When plaster of Paris is mixed with water and applied around the fractured limbs, it sets in to a hard mass.
Answer: A
Plaster of Paris when mixed with water and applied around the fractured limbs, it sets in to a hard mass and keeps the bone joints in a fixed position. So, it can be used for setting fractured bones.
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Assertion (A) : Pressure cookers are fitted with ebonite handles.
Reason (R) : Ebonite is strong.
Answer: D
The handles of pressure cookers are made of ebonite because it being a bad conductor of heat, does not heat up.
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Assertion:
The president dissolved the 12th Lok Sabha but asked the present government to continue as a caretaker government.
RI. New government cannot be formed immediately.
RII. The country cannot run without a government.
Answer: D
In both the situations explained by RI and RII, we need to have a caretaker government. Hence, both the valid reasons.
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Assertion (A) : Safety fuses are made up of materials having a high melting point.
Reason (R) : Safety fuses should be resistant to electric current.
Answer: C
Safety fuses are made up of materials having a low melting point so that when excess current flow through the circuit, the fuse melts breaking the circuit and thus prevents appliances.
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Assertion (A) : Earthworms are not good for agriculture.
Reason (R) : Earthworms break down the soil into fine particles and make it soft.
Answer: D
Earthworms help in agriculture because they make the soil soft and porous.
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