The relative velocity of two adjacent layers of a liquid is \(6\) cm/s and the perpendicular distance between layers is \(0.1~\text{mm}.\) The velocity gradient for liquid (in per second) is:
1. \(6\)
2. \(0.6\)
3. \(0.06\)
4. \(600\)
A large open tank with a square hole of side \(0.1\) cm in the wall at a depth of \(0.2\) m from the top is completely filled with a liquid. The rate of flow of liquid (in /s) through the hole will be:
1. | \(1\) | 2. | \(2\) |
3. | \(3\) | 4. | \(4\) |
The property of surface tension of the liquid is due to:
1. | the gravitational force of attraction between the molecules. |
2. | the cohesive forces between the molecules. |
3. | the adhesive force between the molecules. |
4. | the formation of ionic bonds between the molecules. |
When a man sits on a boat of length 2 m and breadth 1 m floating on a lake, the boat sinks by 2 cm. The mass of the man is:
1. 25 kg
2. 40 kg
3. 60 kg
4. 80 kg
If two iron balls when fully immersed in water experience thrust force in the ratio of 1:2, then the ratio of the masses of the balls will be:
1. 1: 1
2. 1: 2
3. 2: 1
4. 1: 4
There are four cylindrical vessels identical in dimensions. If these are filled with equal masses of four different liquids P, Q, R, and S such that their densities are , then pressure at the base of vessel will be:
1. | 2. | ||
3. | 4. | Data is insufficient to predict the relation |
The reading of a spring balance when a block is suspended from it in the air is 60 N. This reading is changed to 40 N when the block is submerged in water. The specific gravity of the block, therefore, must be:
1. 3
2. 2
3. 6
4. 3/2
A beaker full of water is placed on a spring balance. If we put our finger in water without touching the beaker, how will the reading of the balance change? [Take ]
1. Increase
2. Decrease
3. Remain the same
4. Will be halved
If a capillary tube is partially dipped vertically into liquid and the levels of the liquid inside and outside are same, then the angle of contact is:
1. | 90° | 2. | 30° |
3. | 45° | 4. | 0° |
From the given diagram, what is the velocity \(v_3?\)
1. \(4\) m/s
2. \(3\) m/s
3. \(1\) m/s
4. \(2\) m/s