Assertion and Reason problems
- 1. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Pressure cookers are fitted with ebonite handles. Reason (R) : Ebonite is strong.
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
Correct Answer: A is true but R is false.
Explanation:
The handles of pressure cookers are made of ebonite because it being a bad conductor of heat, does not heat up.
- 2. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Diamond is used for cutting glass. Reason (R) : Diamond has a high refractive index.
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
Correct Answer: Both A and R are true but R is NOT the correct explanation of A.
Explanation:
Diamond is very hard due to its rigid three dimensional structure and so, it is used for cutting glass. Refractive index of diamond is high and gives it the greater transparency and brilliance.
- 3. 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
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.
- 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
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.
- 5. 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
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.
- 6. 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
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
- 7. 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
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.
- 8. 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. Discuss
Correct Answer: Both A and R are true but R is NOT the correct explanation of A.
Explanation:
Graphite 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
- 9. 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
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.
- 10. 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
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.
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