11). Assertion (A) : The edges of shadows caused by object when light falls on them are sharp.
Reason (R ) : Diffraction 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. |
|
12). Assertion (A) : When our body is excited, we breathe at a higher rate.
Reason (R ) : When oxygen content in arterial blood increases, breathing becomes faster.
| 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. |
|
13). Assertion (A) : Radio carbon dating is a precise method of determining the age of ancient objects.
Reason (R ) : Once an object dies, the amount of radioactive carbon present in it decreases with time following a definite law.
| 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. |
|
14). Assertion (A) : Fish survive in water under ice at Arctic.
Reason (R ) : Fish in the Arctic region produce unique type of proteins in their 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. |
|
15). Assertion (A) : When it rains in bright sunshine, a rainbow if observed in the sky.
Reason (R ) : White light consists of seven colours.
| 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. |
|
16). Assertion (A) : It is easier to roll a barrel than to pull it along.
Reason (R ) : The full weight of the barrel comes into play when it is pulled.
| 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. |
|
17). Assertion (A) : A hydrogen filled balloon stop rising after it has attained a certain height in the sky.
Reason (R ) : The atmospheric pressure decreases with height and becomes zero when maximum height is attained.
| 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. |
|
18). Assertion (A) : Vitamins are nutrients required in small quantities for good health.
Reason (R ) : Vitamins help to maintain a healthy body by killing harmful bacteria.
| 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. |
|
19). Assertion (A) : Radio does not work in a moving train unless aerial is put outside the window.
Reason (R ) : Train compartment acts as a hollow cylinder and charge is centred which does not allows a radio to work.
| 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. |
|
20). Assertion (A) : Transfer of genetic information from one generation to the next is accomplished by DNA.
Reason (R ) : DNA is fundamentally an antigen antibody reaction.
| 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. |
|
