Choose the correct alternative from the following.
Assertion (A) : Leaves of plants are green.
Reason (R) : Plants contain Chromoplasts, the green pigment.
Answer: C
Leaves of plants are green because they contain the green pigment, chlorophyll. However, plants contains chromoplasts but they are not green pigments.
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Assertion (A) : We prefer to wear white clothes in winter.
Reason (R) : White clothes are good reflectors of heat.
Answer: C
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.
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Assertion (A) : Leakages in household gas cylinders can be detected.
Reason (R) : LPG has a strong smell.
Answer: C
Leakages in household gas cylinders can be detected because of the strong smell smell of ethyl merceptan mixed with LPG.
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Assertion (A) : Simla is colder than Delhi.
Reason (R) : Simla is at a high altitude compared to Delhi.
Answer: A
Simla is colder than Delhi because it is situated at a higher altitude and temperature decreases by 1oC for every 165 meters of ascent.
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For the Assertion (A) and Reason (R) below, choose the correct alternative.
Assertion (A) : Pressure cookers are fitted with ebonite handles.
Reason (R) : Ebonite is strong.
Answer: C
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(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) : An iron ball floats on mercury but gets immersed in water.
Reason (R) : The specific gravity of iron is more than that of mercury.
Answer: C
Iron with specific gravity less than that of mercury but more than that of water, floats in the former but gets immersed in the second
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Assertion (A) : We feel colder on mountains than on plains.
Reason (R) : Temperature decreases with altitude.
Answer: A
Higher above the sea level, temperature decreases at the rate of 1 degree centigarade for every 165 me-tres of ascent making mountain peaks colder.
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Assertion (A) : In India, females have higher life expectancy than the males.
Reason (R) : Females receive a better diet.
Answer: D
In India, due to high birth rate and due to neglect, females have a lower life expectancy than the males and although females need a better diet, they do not receive it.
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Assertion (A) : An atom is neutral despite the charged particles in it.
Reason (R) : The neutrons do not have any charge.
Answer: B
An atom contains the positively charged protons and an equal number of negatively charged electrons So, it is neutral
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