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451. Which of the following solvents is used for dry cleaning of clothes ?
A. Chloroform
B. Acetone
C. Alcoholc
D. Carbon tetrachloride
Explanation:
452. 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) : Mitochondria is known as power house of the cell.Reason (R) : Enzymes present in mitochondria regulates the breakdown of carbohydrates.
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:
453. Manufacture of hydrogen bomb involves the principle of
A. a controlled chain reaction involving nuclear fission.
B. an uncontrolled chain reaction involving nuclear fission.
C. a controlled chain reaction involving nuclear fusion.
D. an uncontrolled chain reaction involving nuclear fusion.
Explanation:
454. If algae suddenly disappear from the water bodies, then all the other aquatic organisms (like fish, prawns and protozoans) will die. This is because of
A. lack of food
B. lack of shelter
C. lack of food and oxygen
D. dead algal mass increasing the oxygen demand
Explanation:
455. Biological pest control is carried out by
A. parrots and kites
B. dragonfly and wasp
C. scorpions and spiders
D. bees and locust
Explanation:
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