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- Question
Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Carbon dioxide turns lime water milky. Reason (R) : Carbon dioxide sullies the water.
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
- A is true but R is false.
ExplanationCarbon dioxide reacts with lime water (calcium hydroxide) to form milky precipitate of calcium carbonate
- 1. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Red colour of blood is due to haemoglobin. Reason (R) : Haemoglobin is a red pigment.
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) : Inside the earth metals are present in molten state. Reason (R) : Earth absorbs the sun's rays.
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) : Appendix is a vestigial organ in human body. Reason (R) : It does not participate in digestion.
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
- 4. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Bats can fly in the night. Reason (R) : Bats emit ultrasonics.
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) : Leakages in household gas cylinders can be detected. Reason (R) : LPG has a strong smell.
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) : a Leaves of plants are green. Reason (R) : Plants contain chromoplasts, the green pigment.
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
- 7. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative 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.
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
- 8. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : An atom is neutral despite the charged particles in it. Reason (R) : The neutrons do not have any charge.
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. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Clothes are not washed properly in hard water. Reason (A) : Hard water contains many minerals.
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
- 10. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative 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. 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: Both A and R are true and R is the correct explanation of A.
Explanation:
Haemoglobin is the blood pigment that imparts red colour to the blood.
Correct Answer: A is true but R is false.
Explanation:
Inside the earth, the high temperature and pressure keeps the metals in molten state. The earth does not absorb the sun's rays but reflects them.
Correct Answer: Both A and R are true and R is the correct explanation of A.
Explanation:
Appendix, earlier used to digest raw vegetable matter, is now a vestigial organ in human body and does-not perform any function.
Correct Answer: Both A and R are true and R is the correct explanation of A.
Explanation:
Bats can fly in the night because they can trace the obstacle in the path by perceiving the echo of the ultrasonic sound emitted by them after it is reflected by the obstacle.
Correct Answer: A is true but R is false.
Explanation:
Leakages in household gas cylinders can be detected because of the strong smell of ethyl merceptan mixed with LPG.
Correct Answer: A is true but R is false.
Explanation:
Leaves of plants are green because they contain the green pigment, chlorophyll. However, plants contain chromoplasts but they are not green pigments.
Correct Answer: A is true but R is false.
Explanation:
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.
Correct Answer: Both A and R are true but R is NOT the correct explanation of A.
Explanation:
An atom contains the positively charged protons and an equal number of negatively charged electrons So, it is neutral
Correct Answer: Both A and R are true but R is NOT the correct explanation of A.
Explanation:
Clothes are not washed properly in hard water because it does not form lather with soap. However, it is true that hard water contains many minerals.
Correct Answer: Both A and R are true and R is the correct explanation of A.
Explanation:
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.
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