There is some liquid in a closed bottle. The amount of liquid is continuously decreasing. The vapour in the remaining part
(a) must be saturated
(b) must be unsaturated
(c) may be saturated
(d) there will be no vapour.
1 Answers
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Why is liquid ammonia bottle first cooled in ice before opening it?
At room temperature, the vapour pressure of liquid ammonia is very high. On cooling vapour pressure decreases, therefore the liquid ammonia will not splash out
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Heat is generated continuously in an electric heater but the temperature of its element becomes constant after some time. Why?
When the temperature of the heater becomes greater than the temperature of the surrounding, some of the heat is lost to the surroundings in the form of thermal radiations. After...
1 Answers 2 views
Take out a cooled bottle of water from refrigerator and keep it on a table. After some time you notice a puddle of water around it. Why?
It is due to condensation of water vapours present in air. Air contains water in the form of vapours, when it comes in contact of cool water bottle, it gets...
1 Answers 1 views
During summer, Boojho carries water in a transparent plastic bottle to his school. One day he left his bottle in the school.
(c) evaporation and condensation.
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A beaker containing a liquid is kept inside a big closed jar. If the air inside the jar is continuously pumped out,
(b) decrease EXPLANATION: The pressure at the bottom of the liquid is the sum of atmospheric pressure and the pressure due to the height of the liquid. When the air inside the...
1 Answers 1 views
A piece of wood is floating in water kept in a bottle. The bottle is connected to an air pump. Neglect the compressibility of water.
(c) same part in the water EXPLANATION: Pushing air inside the bottle will increase the air pressure. When the pressure of air inside the bottle is increased it does not increase the...
1 Answers 1 views
Because of the friction between the water in oceans with the earth's surface, the rotational kinetic energy of the earth is continuously decreasing.
The earth’s angular speed decreases by 0.0016 rad/day in 100 years. Therefore the torque produced by the ocean water in decreasing earth’s angular velocity π = Iα = 2/5 mr2 × (ω – ω0)/t =...
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There is some liquid in a closed bottle.
(a) must be saturated
1 Answers 1 views
We are consuming a lot of electrical energy, solar energy etc Do you, therefore, conclude that energy of the universe is continuously decreasing?
No, energy of the universe remains constant (law of conservation of energy). Entropy of the universe is continuously increasing.
1 Answers 1 views
There are some balls of red, green and yellow colour lying on a table. There are as many red balls as there are yellow balls.
(b) According to question R = y and y = 2G ∴ R = 2G Hence, the number of red balls is double the number of green balls.
1 Answers 1 views