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General Science - Questions and Answers

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86. Genetic variation arises by
A. recombination
B. mutation
C. chromosomal aberrations
D. All of these
Explanation:
87. The chief agent of evolution is
A. mutation
B. acquired characters
C. sexual reproduction
D. natural selection
Explanation:
88. Water pipes are apt to burst in cold weather because
A. heavy pressure is exerted by snow
B. they contact in cold.
C. the water in the pipe turns into ice and expands.
D. the water in the pipe cannot evaporate.
Explanation:
89. Both the pans of a balance are kept in equilibrium by putting equal weights. When the balance is kept in upward moving lift, the equilibrium
A. will be disturbed
B. will remain undisturbed
C. will be disturbed if lift is accelerated
D. will remain undisturbed if lift is moving with a constant velocity
Explanation:
90. The cranial capacity of Which of the following prehistoric men was equal to modern man ?
A. Pekng man
B. Cro-Mangnon Man
C. Australopithecus
D. Neanderthal man
Explanation:
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