Assertion (A): | Insects are observed to walk on the surface of water. |
Reason (R): | This is due to the viscous force of water acting on the insect's legs. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |
Given below are two statements:
Assertion (A): | Water flows through a smooth horizontal tube with a narrowing cross-section and its pressure increases. |
Reason (R): | Bernoulli's equation for fluids states that \(P+\dfrac{1}{2}\rho v^2+\rho gh= \) constant along a streamline. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |
Assertion (A): | Smaller drops of water resist deformation forces better than larger drops. |
Reason (R): | Excess pressure inside the drop is inversely proportional to its radius. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |
Assertion (A): | The stream of water flowing at high speed from a garden hose, and pipe tends to spread like a fountain when held vertically up but tends to narrow down when held vertically down. |
Reason (R): | In any steady flow of an incompressible fluid, the volume flow rate of the fluid remains constant. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion (A): | When height of a tube is less than liquid rise in the capillary tube, the liquid does not overflow. |
Reason (R): | Product of radius of meniscus and height of liquid in capillary tube always remains constant. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |
Assertion (A): | If a liquid in a vessel is stirred and left to itself, the motion disappear after few minutes. |
Reason (R): | The moving liquid exerts equal and opposite force. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion (A): | A large force is required to draw apart normally two glass plates enclosing a thin water film. |
Reason (R): | Water works as glue and sticks two glass plates. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | (A) is false but (R) is true. |
Assertion (A): | The water rises higher in a capillary tube of small diameter than in a capillary tube of large diameter. |
Reason (R): | The height through which liquid rises in a capillary tube is inversely proportional to the diameter of the capillary tube. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |
Assertion (A): | A small drop of mercury is spherical but bigger drops are oval in shape. |
Reason (R): | Surface tension of liquid decreases with increase in temperature. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |
Assertion (A): | To float, a body must displace liquid whose weight is greater than actual weight of the body. |
Reason (R): | During floating the body will experience no net downward force in that case. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |