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486. Cover of capsule is made of
A. paper
B. polythene
C. egg shell
D. starch
Explanation:
487. 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 ?Assetion (A) : The edges of shadows cause by objects when light falls on them are sharp.Reason (R) : Diffraction of of light at an edge produces a redistribution of intensity at the edge of the shadow.
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:
488. Which of the following is correctly matched ? 1. LYMAN series - Visible region 2. BALMER series - Ultraviolet region 3. PASCHEN series - Infrared region
A. a and 2
B. 2 and 3
C. 3 only
D. 1, 2 and 3 only
Explanation:
489. 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) : Water is both acidic and basic.Reason : The pH of water is seven.
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:
490. Both sodium atoms and sodium ions have the same number of
A. electrons
B. electric charge
C. protons
D. electron shells
Explanation:
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