Assertions and Reasons Questions and answers

  1. General Science
    1. Assertions and Reasons
    2. Biology
    3. Chemistry
    4. Physics
    5. Inventions
31). Assertion (A) : Wet sand looks darker than dry sand.
Reason (R ) : Water is opaque to visible light.

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.
32). Assertion (A) : Forests play a role in retaining sub-soil water.
Reason (R ) : Forests add humus to the soil.

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.
33). Assertion (A) : Some birds eat small stones with the grains.
Reason (R ) : The stones eaten by birds accumulate in the gizzard and facilitate the grinding process and thus help digestion.

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.
34). Assertion (A) : If the earth did not have an atmosphere, its average surface temperature would be lower than what it is.
Reason (R ) : The ozone layer in the atmosphere absorbs the ultraviolet radiation.

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.
35). Assertion (A) : A gas thermo0meteer is more sensitive than a liquid thermometer.
Reason (R ) : Gases can be heated to high temperatures whereas liquids vaporise at a particular temperature.

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.


36). 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.

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.
37). 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.

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.
38). 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.

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.
39). 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.

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.
40). 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.

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.
Go to :
Total Pages : 7