Question 1

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Weeds should not be allowed to grow along with the crops. Reason (R) : Weeds leave no space for plants to grow.

Accepted Answer

Weeds should not be allowed to grow along with the crops because they consume the plant nutrients.

Question 2

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative 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.

Accepted Answer

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

Question 3

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : We feel colder on mountains than on plains. Reason (R) : Temperature decreases with altitude.

Accepted Answer

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.

Question 4

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Cut fruits and vegetables should not be kept in open for long. Reason (R) : Their vitamin content is ruined.

Accepted Answer

When cut fruits and vegetables are kept in open, the vitamins in them get oxidised and remain of no use.

Question 5

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : In India, people elect their own representatives. Reason (R) : India is a democracy.

Accepted Answer

India, being a democracy, it is a government run by the representatives elected by its people

Question 6

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : In India, females have higher life expectancy than the males. Reason (R) : Females receive a better diet.

Accepted Answer

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.

Question 7

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Gandhiji withdrew the non-cooperation movement Reason (R) : There was violence at the Chauri Chaura outrage

Accepted Answer

Gandhiji withdrew the non-cooperation movement because of the violence in the Chauri Chaura outrage.

Question 8

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Mohammad-bin-Tughluq is called the 'wisest fool'. Reason (R) : He had wise plans but implemented them foolishly.

Accepted Answer

R provides the correct explanation of A.

Question 9

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Leakages in household gas cylinders can be detected. Reason (R) : LPG has a strong smell.

Accepted Answer

Leakages in household gas cylinders can be detected because of the strong smell of ethyl merceptan mixed with LPG.

Question 10

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Bats can fly in the night. Reason (R) : Bats emit ultrasonics.

Accepted Answer

Bats can fly in the night because they can trace the obstacle in the path by perceiving the echo of the ultrasonic sound emitted by them after it is reflected by the obstacle.

Question 11

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Appendix is a vestigial organ in human body. Reason (R) : It does not participate in digestion.

Accepted Answer

Appendix, earlier used to digest raw vegetable matter, is now a vestigial organ in human body and does-not perform any function.

Question 12

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Inside the earth metals are present in molten state. Reason (R) : Earth absorbs the sun's rays.

Accepted Answer

Inside the earth, the high temperature and pressure keeps the metals in molten state. The earth does not absorb the sun's rays but reflects them.

Question 13

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Red colour of blood is due to haemoglobin. Reason (R) : Haemoglobin is a red pigment.

Accepted Answer

Haemoglobin is the blood pigment that imparts red colour to the blood.

Question 14

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Carbon dioxide turns lime water milky. Reason (R) : Carbon dioxide sullies the water.

Accepted Answer

Carbon dioxide reacts with lime water (calcium hydroxide) to form milky precipitate of calcium carbonate

Question 15

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : a Leaves of plants are green. Reason (R) : Plants contain chromoplasts, the green pigment.

Accepted Answer

Leaves of plants are green because they contain the green pigment, chlorophyll. However, plants contain chromoplasts but they are not green pigments.

Question 16

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion(A) : In India, the judiciary is independent of the executive. Reason (R) : Judiciary favours the government and helps in the implementation of its plan…

Accepted Answer

In India, the judiciary is completely independent of the executive. It has no interference in the affairs of the state nor can it be influenced by the government.

Question 17

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : An atom is neutral despite the charged particles in it. Reason (R) : The neutrons do not have any charge.

Accepted Answer

An atom contains the positively charged protons and an equal number of negatively charged electrons So, it is neutral

Question 18

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Clothes are not washed properly in hard water. Reason (A) : Hard water contains many minerals.

Accepted Answer

Clothes are not washed properly in hard water because it does not form lather with soap. However, it is true that hard water contains many minerals.

Question 19

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion(A) : The steam engine was invented by James Watt. Reason (R) : There was a problem of taking out water from flooded mines

Accepted Answer

The problem of pumping out water from the flooded mines provided the need of a self working engine, which led James Watt to invent the same.

Assertion and Reason Questions