An iceberg of density 900 kg/ is floating in water of density 1000 Kg/. The percentage of volume of ice-cube outside the water is:
1. 20%
2. 35%
3. 10%
4. 25%
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
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
A body of density \(0.7\) g/cm3 floats on a lake of water. The fraction of the body that is outside water is:
1. \(30 \text{%}\)
2. \(70 \text{%}\)
3. \(25 \text{%}\)
4. \(50 \text{%}\)
A block weighs 5 N in air and 4.5 N in a liquid of specific gravity 0.5. Its weight in water will be:
1. 3.5 N
2. 4.0 N
3. 2.5 N
4. 3.0 N
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
Two non-mixing liquids of densities and n(n>1) are put in a container. The height of each liquid is h. A solid cylinder floats with its axis vertical and length pL in the denser liquid. The density of the cylinder is d. The density d is equal to:
1. {2+(n+1)p}
2. {2+(n-1)p}
3. {1+(n-1)p}
4. {1+(n+1)p}
A wooden block with a coin placed on its top, floats in water as shown in fig. The distance \(l\) and \(h\) are shown there. After some time the coin falls into the water. Then:
1. | \(l\) decreases and \(h\) increases |
2. | \(l\) increases and \(h\) decreases |
3. | Both \(l\) and \(h\) increase |
4. | Both \(l\) and \(h\) decrease |
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 two pieces of metal when immersed in a liquid have equal upthrust on them, then:
1. | Both pieces must have equal weights |
2. | Both pieces must have equal densities |
3. | Both pieces must have equal volumes |
4. | Both are floating in the same depth |