Assertion and reason type of questions test the candidate's cognizance and with it, his ability to reason out correctly. In this type of questions, two verbal expressions are given labelled as Assertion (A) and Reason (R) along with five alternatives. Candidate has to find the correct alternative.
Directions : In each of the questions given below, there are two statements labelled 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) : Copper is used to make electric wires.
Reason (R) : Copper has very low electrical resistance.
2. Assertion (A) : The pouring of kerosene oil on stagnant pools helps to eradicate malaria.
Reason (R) : The kerosene oil is poisonous for the mosquitoes.
3. Assertion (A) : Baking soda creates acidity in the stomach.
Reason (R) : Baking soda is alkaline.
4. Assertion (A) : Indus Valley people knew the art of navigation.
Reason (R) : Indus Valley seals indicate prevalence of overseas trade.
5. Assertion (A) : Bangladesh imports jute from India.
Reason (R) : Bangladesh has most of the jute mills.
6. 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.
7. Assertion (A) : Tamil Nadu gets most of the rainfall in winter.
Reason (R) : Tamil Nadu gets rainfall from retreating monsoons.
8.Assertion (A) : An electric bulb makes a bang when it is broken.
Reason (R) : The air inside the bulb rushes out immediately on breaking.
9. Assertion (A) : The freezing of sea water during winter does not kill the fishes.
Reason (R) : Only surface water is frozen.
10. Assertion (A) : Inside the Earth metals are present in molten state.
Reason (R) : Earth absorbs the sun's rays.
11. Assertion (A) : The same side of the Moon faces the Earth at all times.
Region : Moon is the only natural satellite of Earth.
12. Assertion (A) : In India, the judiciary is independent of the executive.
Reason (R) : Judiciary favours the government and helps in the implementation of its plans.
13. Assertion (A) : Carbon monoxide when inhaled causes death.
Reason (R) : Carbon monoxide combines with haemoglobin.
14. Assertion (A) : Petrol fire cannot be extinguished by pouring water over it.
Reason (R) : Water is heavier than petrol.
15. Assertion (A) : When a body is dippped in liquid fully or partially, there is a decrease in its weight.
Reason (R) : The decrease in weight is due to the higher density of the displaced liquid.
16. Assertion (A) : Clothes are not washed properly in hard water.
Reason (R) : Hard water contains many minerals.
17. Assertion (A) : Leakages in household gas cylinders can be detected.
Reason (R) : LPG has a strong smell.
18. Assertion (A) : Simla is colder than Delhi.
Reason (R) : Simla is at a higher altitude as compared to Delhi.
19. Assertion (A) : The use of chlorofluorocarbons is banned throughout the world nowadays.
Reason (R) : These chemicals cause skin cancer.
20. Assertion (A) : Sprouting should not be done before consuming the grains.
Reason (R) : Sprouting kills many vital vitamins.
Directions : In each of the questions given below, there are two statements labelled 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) : Copper is used to make electric wires.
Reason (R) : Copper has very low electrical resistance.
Answer : (a) Both A and R are true and R is the correct explanation of A.
Explanation :
A low electrical resistance of copper makes it a good electrical conductor. So, it is used to make electric wires.2. Assertion (A) : The pouring of kerosene oil on stagnant pools helps to eradicate malaria.
Reason (R) : The kerosene oil is poisonous for the mosquitoes.
Answer : (c) A is true but R is false.
Explanation :
The kerosene oil sprayed on the water provides a thin coating and the larvae of mosquitoes are prevented from coming off to breathe. Thus they die.3. Assertion (A) : Baking soda creates acidity in the stomach.
Reason (R) : Baking soda is alkaline.
Answer : (d) A is false but R is true.
Explanation :
Baking soda, being alkaline, neutralises the acidity of the stomach and removes it.4. Assertion (A) : Indus Valley people knew the art of navigation.
Reason (R) : Indus Valley seals indicate prevalence of overseas trade.
Answer : (a) Both A and R are true and R is the correct explanation of A.
Explanation :
The seals found at Indus valley sides gave evidence of overseas trade, which was possible only with the knowledge of the art of navigation.5. Assertion (A) : Bangladesh imports jute from India.
Reason (R) : Bangladesh has most of the jute mills.
Answer : (e) Both A and R are false.
Explanation :
When Bangladesh was created after the partition of India, the areas of jute production went to Bangladesh while the jute mills were left in India. So, India imports raw jute from Bangladesh.6. 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.
Answer : (a) Both A and R are true and R is the correct explanation of A.
Explanation :
R provides the correct explanation of A.7. Assertion (A) : Tamil Nadu gets most of the rainfall in winter.
Reason (R) : Tamil Nadu gets rainfall from retreating monsoons.
Answer : (a) Both A and R are true and R is the correct explanation of A.
Explanation :
Rainfall in Tamil Nadu is caused by the retreating monsoons which occur in winter.8.Assertion (A) : An electric bulb makes a bang when it is broken.
Reason (R) : The air inside the bulb rushes out immediately on breaking.
Answer : (c) A is true but R is false.
Explanation :
There is a vacuum inside the electric bulb. When the bulb breaks, air rushes in at great speed from all sides to fill the vacuum, thus producing a bang.9. Assertion (A) : The freezing of sea water during winter does not kill the fishes.
Reason (R) : Only surface water is frozen.
Answer : (a) Both A and R are true and R is the correct explanation of A.
Explanation :
In winter, only the surface water of the sea freezes. Further below, water does not freeze because the surface ice provides an insulating coat.10. Assertion (A) : Inside the Earth metals are present in molten state.
Reason (R) : Earth absorbs the sun's rays.
Answer : (c) A is true but R is false.
Explanation :
Inside the Earth, the high temperature and pressure keep the metals in molten state. The Earth does not absorb the sun's rays but reflects them.11. Assertion (A) : The same side of the Moon faces the Earth at all times.
Region : Moon is the only natural satellite of Earth.
Answer : (b) Both A and R are true but R is not the correct explanation of A.
Explanation :
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 Earth.12. Assertion (A) : In India, the judiciary is independent of the executive.
Reason (R) : Judiciary favours the government and helps in the implementation of its plans.
Answer : (c) A is true but R is false.
Explanation :
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.13. Assertion (A) : Carbon monoxide when inhaled causes death.
Reason (R) : Carbon monoxide combines with haemoglobin.
Answer : (a) Both A and R are true and R is the correct explanation of A.
Explanation :
Carbon monoxide, when inhaled, combines with haemoglobin of blood to form carboxyhaemoglobin which inhibits the transport of oxygen.14. Assertion (A) : Petrol fire cannot be extinguished by pouring water over it.
Reason (R) : Water is heavier than petrol.
Answer : (a) Both A and R are true and R is the correct explanation of A.
Explanation :
Water being heavier, sleeps down and petrol rises to the surface and continues to burn as before. So, petrol fire is better extinguished by putting sand over it.15. Assertion (A) : When a body is dippped in liquid fully or partially, there is a decrease in its weight.
Reason (R) : The decrease in weight is due to the higher density of the displaced liquid.
Answer : (c) A is true but R is false.
Explanation :
When a body is deep in liquid, there is a decrease in weight due to the upward thrust exerted on it by the water.16. Assertion (A) : Clothes are not washed properly in hard water.
Reason (R) : Hard water contains many minerals.
Answer : (b) Both A and R are true but R is not the correct explanation of A.
Explanation :
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.17. Assertion (A) : Leakages in household gas cylinders can be detected.
Reason (R) : LPG has a strong smell.
Answer : (c) A is true but R is false.
Explanation :
Leakages in household gas cylinders can be detected because of the strong smell of ethanethiol also known as ethyl mercaptan mixed with LPG.18. Assertion (A) : Simla is colder than Delhi.
Reason (R) : Simla is at a higher altitude as compared to Delhi.
Answer : (a) Both A and R are true and R is the correct explanation of A.
Explanation :
Simla is colder than Delhi because it is situated at a higher altitude and temperature decreases by 1°C for every 165 meter of ascent.19. Assertion (A) : The use of chlorofluorocarbons is banned throughout the world nowadays.
Reason (R) : These chemicals cause skin cancer.
Answer : (c) A is true but R is false.
Explanation :
The use of chlorofluorocarbons is bad nowadays because these cause holes in the ozone layer through which ultraviolet rays penetrate and may cause skin cancer.20. Assertion (A) : Sprouting should not be done before consuming the grains.
Reason (R) : Sprouting kills many vital vitamins.
Answer : (e) Both A and R are false.
Explanation :
Sprouted grains should be consumed because sprouting enhances the nutrient content of the grains.
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