Assertion
and Reason
Directions: In each of the questions given below,
there are two statements labeled as Assertion (A) and Reason (R).
Mark your answer as per the codes provided below:
(a) Both A
and R are true and R is the correct explanation of A.
(b) Both A
and R are true but R is not the correct explanation of A.
(c) A is true
but R is false.
(d) A is
false but R is true.
(e) Both A
and R are false.
1. Assertion
(A) : When lightning strikes, the sound is heard a little
after the flash is seen.
Reason
(R) : The velocity of light is greater than that of the
sound.
2. Assertion
(A) : A ship rises as it enters the
sea from a river.
Reason
(R) : The density of sea water is higher as compared to
river water.
3. Assertion (A) : Indian President is
the head of the State.
Reason
(R) : Indian Parliament consists of the President, Lok Sabha
and Rajya Sabha.
4. Assertion
(A) : The pouring of kerosene oil on stagnant pools helps to
eradicate malaria.
Reason
(R) : The kerosene oil is poisonous for the mosquitoes.
5. Assertion
(A) : Uranium undergoes nuclear fusion reaction.
Reason
(R) : It has a big, unstable nucleus.
6. Assertion
(A) : Petrol fire cannot be extinguished by pouring water
over it.
Reason
(R) : Water is heavier than petrol.
7. Assertion
(A) : The
British sovereignty continued to exist in free India.
Reason
(R) : The British sovereign appointed the last
Governor-General of free India.
8. Assertion
(A) : Diamond is used for cutting glass.
Reason
(R) : Diamond has a right refractive indexd.
9. Assertion
(A) : The same side of the moon faces the earth at all
times.
Reason
(R) : Moon is the only natural
satellite of Earth.
10. Assertion
(A) : Sprouting should not be done before consuming the
grains.
Reason
(R) : Sprouting kills many vital vitamins.
ANSWER
WITH EXPLANATION
|
1. |
(a) |
R provides the correct reason for A. |
|
2. |
(a) |
Due to higher density of sea water, the upthrust
produced by the sea water on the ship is greater as compared to that produced
by river water. |
|
3. |
(b) |
Both A and R are true. Indian President is the
constitutional or titular heads of the executive, the real power being vested
in the Council of Ministers. |
|
4. |
(c) |
The kerosene oil sprayed on the water provides a
thin coating and the larvae of mosquitoes are prevented from coming up to
breathe. Thus, they die. |
|
5. |
(d) |
Having a big, unstable nucleus, uranium undergoes
nuclear fission reaction. |
|
6. |
(a) |
Water, being heavier, slips down and petrol rises to
the surface and continues to burn as before. So, petrol fire is better
extinguished by putting sand over it. |
|
7. |
(d) |
India drafted its own Constitution and formed its
own government after gaining independence. So, A is false. But R is true. |
|
8. |
(b) |
Diamond is hard due to its rigid three dimensional
structure and so, it is used for cutting glass. Refractive index of diamond is high and this gives
it greater transparency and brilliance. |
|
9. |
(b) |
The Moon rotates on its axis once in 27 days and it also takes the same time to revolve
around the Earth. So, only one side of the Moon remains visible on Earti. |
|
10. |
(e) |
Sprouted grains should be consumed because sprouting
enhances the nutrient content of the grains. |