- 1(current)
Q. No.(Given \(g=10\) ms–2, viscosity of water \(=1.0\times10^{-5}\) N-sm–2)
1. \(15\) m
2. \(25\) m
3. \(20\) m
4. \(10\) m
| 1. | move up with constant acceleration. |
| 2. | move up with constant velocity. |
| 3. | move up with variable acceleration and finally, it may attain a terminal speed. |
| 4. | remain at rest. |
1. \(r^{1/2}\)
2. \(r\)
3. \(r^{2}\)
4. \(r^{3}\)
1. \(15\times 10^{-3}~\text{N}\)
2. \(30\times 10^{-3}~\text{N}\)
3. \(1.5\times 10^{-3}~\text{N}\)
4. \(20\times 10^{-3}~\text{N}\)
(The density of air is negligible).
1. \(15\) poise
2. \(9\) poise
3. \(18\) poise
4. \(11\) poise
1. \(8.48 \times10^{-3}\) N
2. \(8.48 \times10^{-5}\) N
3. \(4.23 \times10^{-3}\) N
4. \(4.23 \times10^{-6}\) N
A tall cylinder is filled with viscous oil. A round pebble is dropped from the top with zero initial velocity. The plot shown in the figure indicates the one that represents the velocity \((v)\) of the pebble as a function of time \((t).\)
| 1. |  |
2. |  |
| 3. |  |
4. |  |
In Millikan’s oil drop experiment, what is the terminal speed of an uncharged drop of radius \(2\times10^{-5}\) m and density \(1.2\times10^{3}\) kg-m–3? (Take the viscosity of air at the temperature of the experiment to be \(1.8\times10^{-5}\) Pa-s.)
| 1. | \(2.7\) cm/s | 2. | \(3.9\) cm/s |
| 3. | \(5.8\) cm/s | 4. | \(4.6\) cm/s |
Spherical balls of radius \(R\) are falling in a viscous fluid of viscosity with a velocity \(v.\) The retarding viscous force acting on the spherical ball is:
| 1. | directly proportional to \(R\) but inversely proportional to \(v.\) |
| 2. | directly proportional to both radius \(R\) and velocity \(v.\) |
| 3. | inversely proportional to both radius \(R\) and velocity \(v.\) |
| 4. | inversely proportional to \(R\) but directly proportional to velocity \(v.\) |
A particle released from rest is falling through a thick fluid under gravity. The fluid exerts a resistive force on the particle proportional to the square of its speed. Which one of the following graphs best depicts the variation of its speed \(v\) with time \(t?\)
| 1. |  |
2. |  |
| 3. |  |
4. |  |
- 1(current)
Q. No.
© 2024 GoodEd Technologies Pvt. Ltd.