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Practice questions on General Science.

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406. Given below are two statements, labeled as Assertion (A) and Reason (R). In the context of the two statements, which of the following is correct ? 1. Assertion (A) : Uranium undergoes nuclear fusion reaction. 2. Reason (R) : It has a big, unstable nucleus.
A. Both A and R are true but 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:
407. Which of the following can be used for biological control of mosquitoes ?
A. Gamaxene
B. DDT
C. Gambusia
D. Oil
Explanation:
408. Tobacco - mosaic virus has
A. single stranded DNA
B. double stranded RNA
C. double stranded DNA
D. single stranded RNA
Explanation:
409. An organism possessing a chromosomal complement different from the diploid one such as 2n - l or 2n + l is called
A. Allopolyploid
B. Amphidiploid
C. Aneuploid
D. Autopolyploid
Explanation:
410. Which of the following gases is used for refrigeration ?
A. Chlorine
B. Sulphur dioxide
C. Phosphine
D. Ammonia
Explanation:
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