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441. Given below are two statements, labelled as Assertion (A) and Reason (R). In the context of the two statements, which of the following is correct ?Assertion (A) : Toothpaste spreads quickly all over the areas of teeth.Reason (R) : Surface tension of toothpaste is less than that of water.
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.
Explanation:
442. Which of the following plants can fix atmospheric nitrogen from air
A. Rice
B. Wheat
C. Jute
D. Pea
Explanation:
443. Given below are two statements, labelled as Assertion (A) and Reason (R). In the context of the two statements, which of the following is correct ?Assertion (A) : Tin exhibits allotrophy.Reason (R) : Tin reacts with hydrochloric acid, liberating hydrogen.
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.
Explanation:
444. The non - conventional source(s) of energy is/are 1. Biogas 2. Geothermal 3. Lignite
A. 1 only
B. 1 and 2
C. 1 and 3
D. 1, 2 and 3
Explanation:
445. Which of the following is a common constituent of transistors ?
A. Iron
B. Copper
C. Beryllium
D. Germanium
Explanation:
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