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376. Which of the following represents the correct sequence of the four types of coals in order of their declining quality (decreasing carbon content) ? 1. Anthracite 2. Peat 3. Lignite 4. Bituminous
A. 4, 1, 3, 2
B. 1, 4, 3, 2
C. 1, 3, 4, 2
D. 4, 1, 2, 3
Explanation:
377. Soil is depleted of nitrogen because of repeated growing of a cereal like wheat. In order to enrich the soil again, one should grow
A. soyabean or alfalfa
B. alfalfa or maize
C. soyabean or eucalyptus
D. alfalfa or eucalyptus
Explanation:
378. Peat is the result of
A. partial decomposition of plant material
B. plant material being submerged in plant containing lime
C. water being squeezed out of plants
D. water seeping into the plant material
Explanation:
379. 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 ?Assertion (A) : Photosynthesis takes place in all green plants.Reason (R) : Chlorophyll is essential for phtosynthesis.
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 true but R is false.
Explanation:
380. An atom of element with mass number 23 and atomic number 11 will have
A. 11 neutrons, 12 protons and 11 electrons
B. 11 protons, 12 neutrons and 11 electrons
C. 11 neutrons, 11 protons and 12 electrons
D. 23 protons and 11 electrons
Explanation:
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