51). Assertion (A) : Osmosis is a process in which a solvent moves from a dilute solution to a more concentrated one across a semipermeable membrane. Reason (R ) : Osmosis continues till the concentrations of the solution on both sides of the membrane become equal.
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. |
|
52). Assertion (A) : Fingerprints of criminals have certain special features. Reason (R ) : No two persons have the same fingerprint patterns.
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. |
|
53). Assertion (A) : Starch is produced by green plants in the presence of sunlight. Reason (R ) : Chlorophyll is essential for food synthesis in plants.
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. |
|
54). 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.
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. |
|
55). Assertion (A) : Nitrogen is increasing in the atmosphere. Reason (R ) : Plants need nitrogen for their growth.
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. |
|
56). 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.
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. |
|
57). 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.
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. |
|
58). 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.
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. |
|
59). Assertion (A) : Currents about 0.1 A passing through the human body prove fatal. Reason (R ) : A large current causes burns to the body.
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. |
|
60). Assertion (A) : Mirrors used in searchlights are concave spherical. Reason (R ) : For searchlight, a parallel beam of light is required.
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. |
|