Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative
Assertion (A) : Glass tumbler breaks in winter when hot water is poured in it.
Reason (R) : When hot water is poured. the outer surface of glass expands.
When in winter, hot water is poured in the glass tumbler. its inner surface tends to expand while the Outer surface in contact with cold atmosphere does not. This opposite interaction causes the tumbler to break.
Assertion (A) : When the bus starts, the person inside it falls forward.
Reason (R) : The bus pushes the man forward.
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.
Assertion (A) : Himalayas once laid under the sea.
Reason (R) : Fossils of marine creatures are traced on the Himalayas.
Himalayas are the young fold mountains that at one time are believed to lie inside the Tethys sea. This is evident from the recovery of fossils of marine creatures on its peaks.
Assertion(A) : When common salt is kept open, it absorbs moisture from the air.
Reason (R) : Common salt contains magnesium chloride.
Magnesium chloride present in common salt is a deliquescent substance i.e. it absorbs moisture from the air when kept in open.
Assertion (A) : Most of the Himalayan rivers are perennial.
Reason (R) : They are fed by melting snow.
Most Himalayan rivers originating in Himalayan peaks are perennial because they are fed by the melting snow throughout the year.
Assertion (A) : Weeds should not be allowed to grow along with the crops.
Reason (R) : Weeds leave no space for plants to grow.
Weeds should not be allowed to grow along with the crops because they consume the plant nutrients.
Assertion (A) : a Leaves of plants are green.
Reason (R) : Plants contain chromoplasts, the green pigment.
Leaves of plants are green because they contain the green pigment, chlorophyll. However, plants contain chromoplasts but they are not green pigments.
Assertion (A) : The Indian Constitution came into force with effect from 26th January. 1950.
Reason (R) : 26th January is celebrated as the Republic Day.
The Indian Constitution came into force with effect from January 26, 1950 and since then this day is celebrated as the Republic Day.
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