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481. Which of the following is the name of the smallest part of the matter discovered recently by the scientists ?
A. Proton
B. Nertron
C. Positron
D. Quark
Explanation:
482. 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) : Vitamins are nutrients required in small quantities for good health.Reason (R) : Vitamins help to maintain a healthy body by killing harmful bacteria.
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:
483. If you use a microscope to watch smoke particles in still air, you will see them moving about all the time. This phenomenon is called
A. Brownian effect
B. Osmosis
C. Tyndall effect
D. Diffusion
Explanation:
484. 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) : Plants when kept in oxygen free atmosphere survive longer in light than in dark.Reason (R) : In light, plants produce oxygen due to photosynthesis and manyfacture their own food.
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:
485. The lightest particle of matter is
A. electron
B. meutron
C. proton
D. deuteron
Explanation:
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