51. NCERT objective type questions

Exercise condition:

3 m.

Choose the best answer:

1. The gas released during the preparation of bread is

Oxygen
Nitrogen
Carbon dioxide
Sulphur dioxide

2. Match the names of scientists given in Column A with the discovery made by them given in Column B.

Column A Column B
(a) Louis Pasteur (i)Penicillin
(b) Robert Koch (ii)Anthrax bacterium
(c) Edward Jenner (iii)Fermentation
(d) Alexander Fleming (iv)Small pox vaccine
(v) Typhoid

(a) —(i), (b)—(iii), (c)—(ii),(d)—(v)
(a) —(ii), (b)—(i), (c)—(iv),(d)—(v)
(a) —(iii), (b)—(ii), (c)—(iv),(d)—(i)
(a) —(i), (b)—(ii), (c)—(iii),(d)—(iv)

3. Assertion: The most apparent sign of Jaundice is a yellow tinge to the skin, mucous membrane and the whites of the eyes.

Reason: A high level of bilirubin content in the blood causes the Jaundice.

Assertion is correct, but reason is false.
Both Assertion and Reason are correct, but reason is not the correct explanation of assertion.
Both Assertion and Reason are correct, and reason is the correct explanation of assertion.
Assertion is false, but reason is correct.

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