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) : When light travels from a denser to a rarer medium, it loses speed but not energy. Reason (R ) : Energy carried by a wave depends on the amplitude and not the speed of wave propagation.
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2). Assertion (A) : It is easier to start a car engine one a warm day that on a chilly day. Reason (R ) : The internal resistance of a car battery increases with increase in temperature.
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3). Assertion (A) : Catalytic convertors are specifically for use in automobiles using leaded petrol. Reason (R ) : Catalytic converters convert harmful exhaust gases into carbon dioxide, steam and nitrogen.
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4). Assertion (A) : The growth of rice plant is better when it is cultivated along with blue-green algae. Reason (R ) : Blue-green algae increase the soil fertility through nitrogen fixation.
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5). Assertion (A) : The nucleus is the central dense part of an atom. Reason (R ) : The nucleus is composed of positively charged protons and negatively charged electrons.
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6). Assertion (A) : Woollens keep us warm. Reason (R ) : Wool fibres are made of a particular protein which is a bad conductor of heat.
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7). Assertion (A) : Fatty acids should be a part of the balanced human diet. Reason (R ) : The cells of the human body cannot synthesize any fatty acids.
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8). Assertion (A) : Natural selection maintains and propagates the beneficial genes while limiting harmful ones in a particular environment. Reason (R ) : There are genes which are responsible for the production of beneficial characters while others are harmful.
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9). Assertion (A) : Sounds carry farther at night than during a sunny day. Reason (R ) : During the day, air near the ground is warmer than the air above.
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10). Assertion (A) : The spleen helps the body fight infection. Reason (R ) : The spleen stores red blood cells.
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