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- Question
Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion(A) : Graphite is slippery and used as a lubricant. Reason (R) : Graphite has free electrons.
Options- 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.
- Correct Answer
- Both A and R are true but R is NOT the correct explanation of A.
ExplanationGraphite possesses a layer structure with two successive layers held by weak forces 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
- 1. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : We prefer to wear white clothes in winter. Reason (R) : White clothes are good reflectors of heat.
Options- 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. Discuss
- 2. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Simla is colder than Delhi. Reason (R) : Simla is at a higher altitude as compared to Delhi.
Options- 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. Discuss
- 3. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion(A) : Bangladesh imports jute from India. Reason (R) : Bangladesh has most of the jute mills.
Options- 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. Discuss
- 4. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Eskimos reside in igloos. Reason (R) : No other material except snow is available.
Options- 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. Discuss
- 5. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Pluto is the coldest planet Reason (R) : It receives slanting rays of- the sun.
Options- 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. Discuss
- 6. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : When the bus starts, the person inside it falls forward. Reason (R) : The bus pushes the man forward.
Options- 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. Discuss
- 7. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : We feel comfortable in hot and humid climate. Reason (R) : Sweat evaporates faster in humid climate.
Options- 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. Discuss
- 8. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Legumes revive the soil fertility. Reason (R) : Microbes in the root nodules of legumes fix the atmospheric nitrogen.
Options- 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. Discuss
- 9. Assertion(A) : Indus valley people knew the art of navigation. Reason(R) : Indus valley seals indicate prevalence of overseas trade.
Options- A. R is true but A is fale
- B. A is true but R is false
- C. Both A and R are false
- D. R correctly explains A Discuss
- 10. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Most of the Himalayan rivers are perennial. Reason (R) : They are fed by melting snow.
Options- 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. Discuss
Assertion and Reason problems
Search Results
Correct Answer: A is false but R is true.
Explanation:
We prefer to wear dark clothes in winter because they absorb the heat and keep the body warm. However, white clothes are good reflectors of heat and are worn in summer.
Correct Answer: 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 metres of ascent
Correct Answer: Both A and R are false.
Explanation:
When Bangladesh was created after 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.
Correct Answer: A is true but R is false.
Explanation:
Eskimos live in snow houses called igloos because snow, being a bad conductor of heat, these houses are warm inside.
Correct Answer: A is true but R is false.
Explanation:
Pluto, being farthest from the sun, hardly gets the sun's rays. So, Pluto is the coldest planet.
Correct Answer: Both A and R are false.
Explanation:
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.
Correct Answer: Both A and R are false.
Explanation:
We feel uncomfortable in hut and humid climate because in hot weather, body sweats more but due to high humidity, this sweat does not evaporate easily.
Correct Answer: Both A and R are true and R is the correct explanation of A.
Explanation:
The root nodules of leguminous plants contain certain nitrogen fixing bacteria which absorb the atmospheric nitrogen and convert it into nitrogeneous compounds useful for the plants reviving soil fertility.
Correct Answer: R correctly explains A
Explanation:
The seals found at Indus valley sites gave evidance of overseas trade, which was possible only with the knowledge of art of navigation.
Thus, both A and R are true & R correctly explains A.
Correct Answer: Both A and R are true and R is the correct explanation of A.
Explanation:
Most Himalayan rivers originating in Himalayan peaks are perennial because they are fed by the melting snow throughout the year.
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