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. |
Assertion (A): | The shape of a liquid drop is spherical. |
Reason (R): | The pressure inside the drop is greater than that outside. |
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. |
Sorry!! currently, the explanation for the question is not provided. If you need further help, please email at support@neetprep.com with subject: Explanation Missing for Question Id: 340246
Sorry!! currently, the explanation for the question is not provided. If you need further help, please email at support@neetprep.com with subject: Explanation Missing for Question Id: 340246
Assertion (A): | At the critical temperature, the surface tension of a liquid becomes zero. |
Reason (R): | At this temperature, intermolecular forces for liquids and gases become equal. Liquid can expand without any restriction. |
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 needle placed carefully on the surface of the water may float, whereas a ball of the same material will always sink. |
Reason (R): | The buoyancy of an object depends both on the material and shape 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. |
Assertion (A): | The shape of an automobile is so designed that its front resembles the streamlined pattern of the fluid through which it moves. |
Reason (R): | The resistance offered by the fluid is maximum. |
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): | If the speed of a fluid element increases as it travels along a horizontal streamline, the viscosity of the fluid must decrease. |
Reason (R): | Bernoulli's equation is applicable for all types of fluid flow. |
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): | Machine parts often become jammed in winter. |
Reason (R): | The viscosity of lubricants used in machine parts increases at low temperatures. |
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 hydrogen-filled balloon stops 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. |
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. |