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- Question
- 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
- Correct Answer
- if both A and R are true and R is the correct explanation of A
ExplanationWe 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.
- 1. 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
- 2. 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
- 3. Who cannot be a member of a team of six members?
Options- A. Kapil
- B. Tarun
- C. Abhishek
- D. Rawat Discuss
- 4. If Shalini is selected, what can be the maximum number of members in the team /
Options- A. Five
- B. Six
- C. Four
- D. Seven Discuss
- 5. If Rawat is a member of a team of four members, in how many ways can the team be selected?
Options- A. Two
- B. Three
- C. Four
- D. Five Discuss
- 6. 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
- 7. 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 Discuss
- 8. 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
- 9. 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
- 10. 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
Assertion and Reason problems
Search Results
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: Six
Explanation:
If Shalini is selected, Rawat is definitely not selected. Also, exactly one from Prateek or Tarun is selected, that is, the team can have a maximum of six members.
Correct Answer: Four
Explanation:
If Rawat is selected, Shalini cannot be selected , and therefore Kapil also cannot be selected. Further, Vatsala is definitely selected. Exactly one from Prateek or Tarun has to be selected. This can happen in two ways. Now, the fourth member can be any one from Abhishek and Vinod, which can happen in two ways.
Therefore, total number of ways = 2 x 2 = 4 ways.
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 not the correct explanation of A
Explanation:
In 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.
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.
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