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. |
Assertion (A): | A ship floats higher in the water on a high-pressure day than on a low-pressure day. |
Reason (R): | Floating of ship in the water is not possible because of buoyancy force which is present due to pressure difference. |
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 bubble comes from the bottom of a lake to the top. |
Reason (R): | Its radius increases. |
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 two soap bubbles of different radii are brought into contact, the common interface of contact bulges into the bubble of larger radii. |
Reason (R): | Pressure inside a soap bubble of a lesser radius is more than pressure inside the soap bubble of a larger 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. | Both (A) and (R) are false. |
Assertion (A): | A spaceship while entering the earth's atmosphere is likely to catch fire. |
Reason (R): | The temperature of the upper atmosphere is very high. |
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 thin stainless steel needle can lay floating on a still water surface. |
Reason (R): | Any object floats when the buoyant force balances the weight of the object. |
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. |