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511. 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) : Sun helps to keep the planets in orbit.Reason (R) : Gravitational pull of the sun counterbalances the outward centrifugal force acting on the planets due to their orbital velocity.
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:
512. Which of the following was the first organic compound to be synthesised in the laboratory ?
A. Formic acid
B. Urea
C. Citric acid
D. Benzene
Explanation:
513. Which one of the following is the petroleum wax ?
A. Bees wax
B. Carnauba wax
C. Paraffin wax
D. Jojoba wax
Explanation:
514. Which of the following groups of organisms possesses exoskeleton ?
A. Fishes
B. Coelenterates
C. Arthropoda
D. Molluscs
Explanation:
515. Which of the following is a mixed fertiliser ?
A. Urea
B. Ammonium sulphate
C. CAM
D. NPK
Explanation:
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