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. |
B) Both A and R are true but R is not the correct explanation of A.. |
1). Assertion (A) : Fingerprints of criminals have certain special features. Reason (R ) : No two persons have the same fingerprint patterns.
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2). Assertion (A) : Starch is produced by green plants in the presence of sunlight. Reason (R ) : Chlorophyll is essential for food synthesis in plants.
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3). Assertion (A) : A space shuttle loses radio contact with ground stations for a while during landing. Reason (R ) : As a space shuttle enters earth's atmosphere the shuttle's surface temperature increases, ionising the surrounding air.
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4). Assertion (A) : Nitrogen is increasing in the atmosphere. Reason (R ) : Plants need nitrogen for their growth.
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5). Assertion (A) : Coloured objects fade when exposed to sunlight. Reason (R ) : The ultraviolet part of sunlight alters the arrangement of electrons in the molecules of the object.
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6). Assertion (A) : A bit of detergent on the inside of a windscreen of a car will avoid fogging. Reason (R ) : Detergent reduces the angle of contact between the glass and water.
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7). Assertion (A) : Sodium and chlorine are both poisonous elements but sodium chloride is a part of our regular diet. Reason (R ) : The elements of a compound cannot be separated by any physical means.
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8). Assertion (A) : Currents about 0.1 A passing through the human body prove fatal. Reason (R ) : A large current causes burns to the body.
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9). Assertion (A) : Mirrors used in searchlights are concave spherical. Reason (R ) : For searchlight, a parallel beam of light is required.
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10). Assertion (A) : Long distance radio broadcasts use short wave bands. Reason (R ) : The ionosphere reflects waves in these bands.
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