Logical Reasoning in English ASSERTION AND REASON #MCQ_CetJob

Chapter Wise Logical Reasoning in English ASSERTION AND REASON

1 >>Choose the correct alternative from the following :

Assertion (A) : Bangladesh imports jute from India.

Reason (R) : Bangladesh has most of the jute mills. ?

• (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) Both A and R are false.

Solution When Bangladesh was created after partiton 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.

2 >>Assertion (A) : The steam engine was invented by James Watt.

Reason (R) : There was a problem of taking out water from flooded mines. ?

• (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.

Solution 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.

3 >>Assertion (A) : Increase in carbon dioxide would melt polar ice.

Reason (R) : Global temperature would rise. ?

• (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.

Solution The carbon dioxide envelope in earth's atmosphere traps the heat. With increase in the proportion of carbon dioxide, therefore, the global temperature would rise, thus causing the polar ice to melt.

4 >>Choose the correct alternative from the following :

Assertion (A) : Tamil Nadu gets most of the rainfall in winter.

Reason (R) : Tamil Nadu gets rainfall from retreating monsoons. ?

• (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.

Solution Rainfall in Tamil Nadu is caused by the retreating monsoons which occur in winter.

5 >>Choose the correct alternative from the following :

Assertion (A) : Graphite is slippery and used as a lubricant.

Reason (R) : Graphite has free electrons. ?

• (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.

Solution Graphite possesses a layer structure with two successive layers held by weak force and able to slide over one another. So, graphite is slippery and this property finds its use as a lubricant. In graphite, each carbon atom is linked to three other carbon atoms while one electron in the carbon atom is delocalised. So, graphite has free electrons.

6 >>Choose the correct alternative from the following :

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. ?

• (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) Both A and R are false

Solution 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.

7 >>Choose the correct alternative from the following :

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. ?

• (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.

Solution 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.

8 >>Choose the correct alternative from the following :

Assertion (A) : Copper is used to make electric wires.

Reason (R) : Copper has very low electrical resistance. ?

• (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.

Solution A low electrical resistance of copper makes it a good electric conductor. So, it is used to make electric wires.

9 >>Choose the correct alternative from the following :

Assertion (A) : Uranium undergoes nuclear fusion reaction.

Reason (R) : It has a big, unstable nucleus. ?

• (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.

Solution Having a big, unstable nucleus, uranium undergoes nuclear fission reaction.

10 >>Choose the correct alternative from the following :

Assertion (A) : A little gap is left between iron rails.

Reason (R) : Iron expands in summer. ?

• (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.

Solution Iron expands in summer. So, gaps are left between rails to allow for expansion.

11 >>Choose the correct alternative from the following :

Assertion (A) : When common salt is kept open, it absorbs moisture from the air.

Reason (R) : Common salt contains magnesium chloride. ?

• (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.

Solution Magnesium chloride present in common salt is a deliquescent substance i.e. it absorbs moisture from the air when kept in open.

12 >>Choose the correct alternative from the following :

Assertion (A) : When a body is dipped in a 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. ?

• (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.

Solution When a body is dipped in a liquid, there is a decrease in weight due to the upward thrust exerted on it by the water.

13 >>Choose the correct alternative from the following :

Assertion (A) : Banking soda creates acidity in the stomach.

Reason (R) : Banking soda is alkaline. ?

• (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.

Solution Banking soda, being alkaline, neutralises the acidity in the stomach and removes it.

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14 >>Choose the correct alternative from the following :

Assertion (A) : Most of the Himalayan rivers are perennial.

Reason (R) : They are fed by melting snow. ?

• (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.

Solution Most Himalayan rivers originating in Himalayan peaks are perennial because they are fed by melting snow throughout the year.

15 >>Choose the correct alternative from the following :

Assertion (A) : Amoebiasis is an occupational disease.

Reason (R) : Amoebiasis is caused by inhalation of asbestos dust. ?

• (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) Both A and R are false

Solution Amoebiasis is a microbial disease, caused by protozoa.

16 >>Choose the correct alternative from the following :

Assertion (A) : Plaster of Paris is used by doctors for setting fractured bones.

Reason (R) : When Plaster of Paris is mixed with water and applied around the fractured limbs, it sets into a hard mass. ?

• (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.

Solution Plaster of Paris when mixed with water applied around the fractured limbs, it sets into a hard mass and keeps the bone joints in a fixed position. So, it can be used for setting fractured bones.

Logical Reasoning in English

17 >>Choose the correct alternative from the following :

Assertion (A) : The use of chlorofluoro carbons is banned throughout the world nowadays.

Reason (R) : These chemicals cause skin cancer. ?

• (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.

Solution The use of chlorofluoro carbons is banned nowadays because these cause holes in the ozone layer through which ultraviolet rays penetrate and may cause skin cancer.

18 >>Choose the correct alternative from the following :

Assertion (A) : Bronze is used for making statues.

Reason (R) : Bronze is an alloy of copper and trin. ?

• (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.

Solution Bronze is an alloy of copper and tin. It is resistant to corrosion and so it is used to make statues.

19 >>Choose the correct alternative from the following :

Assertion (A) : India is facing the problem of inflation.

Reason (R) : We have failed to check the growth of black money. ?

• (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.

Solution Inflation in India is caused by unrestricted growth of black money.

20 >>Choose the correct alternative from the following :

Assertion (A) : Leaves of plants are green.

Reason (R) : Plants contain chromoplasts, the green pigment. ?

• (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.

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