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- Question
- Assertion (A)
Graphite is slippery and used as a lubricant.
Reason (R)
Graphite has free electrons.
Options- A. if both A and R are true and R is the correct explanation of A
- B. if both A and R are true and R is not the correct explanation of A
- C. if A is true but R is false
- D. if A is true but R is true
- Correct Answer
- if both A and R are true and R is not the correct explanation of A
ExplanationIn graphite, each carbon atoms is linked to three other carbon atoms, while one electron in the carbon atom is delocalised. So, graphite has free electrons and it is also used as a lubricant but reason does not explains assertion.
- 1. Assertion (A)
Tides indicate the regular and periodic rise and fall in sea level.
Reason (R)
Tides are caused by the gravitational pull of the Moon and sea level.
Options- A. if both A and R are true and R is the correct explanation of A
- B. if both A and R are true and R is not the correct explanation of A
- C. if A is true but R is false
- D. if A is true but R is true Discuss
- 2. Assertion (A)
Alcohol rather than mercury is used in a thermometer to measure a temperature of - 60 C.
Reason (R)
Alcohol has a lower freezing point than mercury.
Options- A. if both A and R are true and R is the correct explanation of A
- B. if both A and R are true and R is not the correct explanation of A
- C. if A is true but R is false
- D. if A is true but R is true Discuss
- 3. Which among the following is not an acceptable combination?
Options- A. Rawat, Vinod, Abhishek, Tarun, Vatsala
- B. Vinod, Abhishek, Prateek, Vatsala, Tarun
- C. Shalini, Kapil, Vatsala, Tarun
- D. Tarun, Vatsala, Shalini, Kapil, Vinod, Abhishek Discuss
- 4. Who among the following cannot be members of the same team?
Options- A. Rawat, Vinod
- B. Kapil, Abhishek
- C. Kapil, Rawat
- D. Vatsala, Vinod Discuss
- 5. Who cannot be a member of a team of six members?
Options- A. Kapil
- B. Tarun
- C. Abhishek
- D. Rawat Discuss
- 6. Assertion (A)
When common salt is kept open, it absorbs moisture from the air.
Reason (R)
Common salt contains magnesium chloride.
Options- A. if both A and R are true and R is the correct explanation of A
- B. if both A and R are true and R is not the correct explanation of A
- C. if A is true but R is false
- D. if A is true but R is true Discuss
- 7. Assertion (A)
The steam engine was invented by James Watt.
Reason (R)
There was a problem of taking out water from flooded mines.
Options- A. if both A and R are true and R is the correct explanation of A
- B. if both A and R are true and R is not the correct explanation of A
- C. if A is true but R is false
- D. if A is true but R is true Discuss
- 8. Assertion (A)
We prefer to wear white clothes in winter.
Reason (R)
White clothes are good reflectors of heat.
Options- A. if both A and R are true and R is the correct explanation of A
- B. if both A and R are true and R is not the correct explanation of A
- C. if A is true but R is false
- D. if A is false but R is true Discuss
- 9. Assertion (A)
Earthworms are not good for agriculture.
Reason (R)
Earthworms break down the soil into fine particles and make it soft.
Options- A. if both A and R are true and R is the correct explanation of A
- B. if both A and R are true and R is not the correct explanation of A
- C. if A is true but R is false
- D. if A is false but R is true Discuss
- 10. Assertion (A)
Mercury is the farthest planet from the Sun.
Reason (R)
Mercury is the smallest planet in the entire solar system.
Options- A. if both A and R are true and R is the correct explanation of A
- B. if both A and R are true and R is not the correct explanation of A
- C. if A is true but R is false
- D. if A is false but R is true Discuss
Assertion and Reason problems
Search Results
Correct Answer: if both A and R are true and R is not the correct explanation of A
Explanation:
Both the assertion and reason are true but reason are true but reason is not the correct explanation of assertion.
Correct Answer: if both A and R are true and R is the correct explanation of A
Explanation:
We know that, mercury freezes at -39 C, while alcohol freezes at a point far below - 100 C. So, alcohol is used to measure lower temperatures. Similarly, mercury boils at 357 C, while alcohol boils at 78 C. So, mercury is used to measure high temperature.
Correct Answer: Vinod, Abhishek, Prateek, Vatsala, Tarun
Explanation:
The team given in option (b) is not possible since Shalini and Kapil have to be selected together.
Correct Answer: Kapil, Rawat
Explanation:
Kapil and Rawat cannot be members of the same team since Kapil and Shalini are to be always selected together, while Rawat and Shalini can never be selected in the same team.
Correct Answer: Rawat
Explanation:
If Rawat is selected, Shalini cannot be selected. Also, Shalini and Kapil will be selected together. Therefore, if Shalini is not selected, Kapil will also not be selected.
It is mentioned that exactly one from Prateek or Tarun will be selected. Taking all the conditions into consideration, Rawat cannot be a member of a team having six members.
Correct Answer: if both A and R are true and R is the correct explanation of A
Explanation:
We know that, common salt contains magnesium chloride. Therefore, it absorbs moisture from the air.
Correct Answer: if A is true but R is false
Explanation:
Assertion is correct but reason is false.
Correct Answer: if A is false but R is true
Explanation:
We prefer coloured/dark clothes in winter as they absorb heat but given reason is true for white clothes.
Correct Answer: if A is false but R is true
Explanation:
Earthworms are good for agriculture as they make the soil fertile. Therefore, assertion is false but the reason is true.
Correct Answer: if A is false but R is true
Explanation:
We know that, mercury is the smallest planet but it is not the farthest planet.
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