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1. In which of the following conditions, the distance between the molecules of hydrogen gas would increase?
(i) Increasing pressure on hydrogen contained in a closed container
(ii) Some hydrogen gas leaking out of the container
iii) Increasing the volume of the container of hydrogen gas
iv) Adding more hydrogen gas to the container without increasing the volume of the container
(a) (i) and (iii)
(b) (i) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)
2. When a gas jar full of air is placed upside down on a gas jar full of bromine vapours, the red-brown vapours of bromine from the lower jar go upward into the jar containing air. In this experiment:
(a) Air is heavier than bromine
b) Both air and bromine have the same density
(c) Bromine is heavier than air
d) Bromine cannot be heavier than air because it is going upwards against gravity
Which one of the following statements is not true?
a) The molecules in a solid vibrate about a fixed position
b) The molecules in a liquid are arranged in a regular pattern
c) The molecules in a gas exert negligibly small forces on each other, except during collisions
d) The molecules of a gas occupy all the space available
When water at 0°C freezes to form ice at the same temperature of 0°C, then it:
a) Absorbs some heat
b) Releases some heat
c) Neither absorbs nor releases heat
d) Absorbs exactly 3.34 x 105J/kg of heat
When heat is constantly supplied by a burner to boiling water, then the temperature of water during vaporisation :
(a) Rises very slowly
b) Rises rapidly until steam is produced
(c) First rises and then becomes constant
d) Does not rise at all
Which of the following has heighest kinetic energy?
Particles of ice at 0 °C
Particles of water at 0 °C
Particles of water at 100 °C
Particles of steam at 100 °C
CO2 can be easily liquefied and even solidified because
It has weak forces of attraction
It has comparatively more force of attraction than other gases
It has more intermolecular space
It is present in atmosphere.
Which of the following does not affect rate of evaporation?
Insoluble heavy impurities
A few substances are arranged in the increasing order of ‘forces of attraction’ between their particles. Which one of the following represents a correct arrangement?
Water, air, wind
Air, sugar, oil
Oxygen, water, sugar
Salt, juice, air
Gunja Is Completed Her Science Chapter Where She Wrote Some Statements. She Wants To Know Whether The Statements Are Correct Or Not? Gunja Wants To Take Help From You:
There are some forces of attraction between the particles of matter which bind them together.
The force of attraction is maximum in the particles of solid matter and minimum in the particles of gases matter.
A material which can flow easily and requires a vessel to keep it called fluid.
All the above