MCQ Flashcards
A diver is able to cut through water in a swimming pool. The property shown by the matter is.
a. the particles are of very very small
b. the particles of matter have space between them
c. the particles are in solid state
d. the particles are running here and there, have no space between them
Which of the following is found in solid state at room temperature?
Stone
b. sand
c. mercury
d. both a and b
The property to flow is unique to fluids. Which one of the following statements is correct?
a. Only gases behave like fluids
b. Gases & solids behave like fluids
c. Gases and liquids behave like fluids
d. Only liquids are fluids
Temperature 200 0C equals nearly to
a. 300K
b. 373K
c. 473K
d. -73K
During summer , water kept in an earthen pot becomes cool because of the phenomenon of
a. diffusion
b. transpiration
c. osmosis
d. evaporation
Assertion: Smell of burning incense stick spreads all around due to the diffusion of its fumes into the air.
Reason: Increased temperature results in increased kinetic energy of the molecules.
a. Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
b. The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
c. Assertion is true but the Reason is false.
d. Assertion is false but the Reason is true.
Assertion: Smell of burning incense stick spreads all around due to the diffusion of its fumes into the air.
Reason: Increased temperature results in increased kinetic energy of the molecules.
a. Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
b. The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
c. Assertion is true but the Reason is false.
d. Assertion is false but the Reason is true.
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
(c) Bromine is heavier than air
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
(b) Releases some heat
The evaporation of a liquid can best be carried out in a:
(a) Flask
(b) China dish
(c) Test tube
(d) Beaker
(b) China dish
Zig-zag movement of the solute particle in a solution is known as
(a) Linear motion
(b) Circular motion
(c) Brownian motion
(d) Curved motion.
(c) Brownian motion
: CO can be easily liquified and even solidified because
(a) It has weak forces of attraction
(b) It has comparatively more force of attraction than other gases
(c) It has more intermolecular space
(d) It is present in atmosphere.
(b) It has comparatively more force of attraction than other gases
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?
(a) Water, air, wind
(b) Air, sugar, oil
(c) Oxygen, water, sugar
(d) Salt, juice, air
(c) Oxygen, water, sugar
Which of the following phenomena always results in the cooling effect?
(a) Condensation
(b) Evaporation
(c) Sublimation
(d) None of these
(b) Evaporation
The colour of vapours formed on sublimation of iodine solid is
(a) Purple (violet)
(b) Colourless
(c) Yellow
(d) Orange
(a) Purple (violet)
A gas which obeys the gas laws is known as:
(a) An ideal gas
(b) A heavier gas
(c) A lighter gas
(d) A real gas
(a) An ideal gas
What s the term used to describe the phase change as a liquid becomes a solid?
(a) Evaporation
(b) Condensation
(c) Freezing
(d) None of the above
(c) Freezing
Which of the following phenomena would increase on raising the temperature?
(a) Diffusion, evaporation, compression of gases
(b) Evaporation, compression of gases, solubility
(c) Evaporation, diffusion, expansion of gases
(d) Evaporation, solubility, diffusion, compression of gases
(c) Evaporation, diffusion, expansion of gases
The quantity of matter present in an object is called its:
(a) Weight
(b) Gram
(c) Mass
(d) Density
(c) Mass
: As solid melts to form liquid:
(a) Inter particle distance increases
(b) Inter molecular forces of attraction decreases
(c) Compressibility increases
(d) All of the above
(d) All of the above
Which of the following is not characteristic of solid:
(a) High Rigidity
(b) Regular Shape
(c) High density
(d) High compressibility
(d) High compressibility
The boiling point of water is:
(a) 101°C at atmospheric pressure
(b) 273K at atmospheric pressure
(c) 0°C at atmospheric pressure
(d) 0K at atmospheric pressure
(a) 101°C at atmospheric pressure
Which of the following has highest intermolecular forces of attraction?
(a) Water at room temperature
(b) CO gas
(c) Ethyl alcohol
(d) Iron metal
(d) Iron metal
Which of the following substances will undergo sublimation?
(a) Common salt
(b) Odonil
(c) Sugar
(d) Sand
(b) Odonil
The process of evaporation causes:
(a) Cooling
(b) Heating
(c) Dryness
(d) None of the above
(a) Cooling
The conversion of solid to gas directly is called:
(a) Evaporation
(b) Sublimation
(c) Distillation
(d) condensation
(b) Sublimation
Evaporation of a liquid can take place:
(a) At its boiling point
(b) At all temperatures
(c) At its freezing point
(d) At a fixed temperature
(b) At all temperatures
Which of the following describes a liquid state:
(a) Definite volume and definite shape
(b) Definite volume and no specific shape
(c) definite shape but no definite volume
(d) neither definite shape nor definite volume
(b) Definite volume and no specific shape
Wet clothes are kept for drying. Which of the following does not help them in drying:
(a) Spreading it out
(b) Blowing wind over it
(c) Making the room a little warmer
(d) Cooling the room
(d) Cooling the room
At higher altitudes the boiling points of liquids
(a) Increases
(b) Decreases
(c) Remains the same
(d) Increases then decreases
(b) Decreases
During evaporation particles of a liquid change into vapours :
(a) From the surface
(b) From the bulk
(c) From the bottom
(d) From all over the liquid
(a) From the surface
In which phenomenon does water change into water vapour below its boiling point:
(a) Boiling
(b) Evaporation
(c) Freezing
(d) Sublimation
(b) Evaporation
We get the smell of hot food in the kitchen outside the house because of:
(a) Boiling
(b) Evaporation
(c) Sublimation
(d) Diffusion
(d) Diffusion
Which are the favourable conditions for liquefaction of petroleum gas:
(a) High pressure, high temperature
(b) Low pressure, low temperature
(c) High pressure, low temperature
(d) Low pressure, high temperature
(c) High pressure, low temperature
Latent heat of vapourisation is used to:
(a) Overcome forces of attraction between the liquid particles at the boiling point
(b) Overcome forces of attraction between solid particles at the freezing point
(c) Increase the kinetic energy of particles in the liquid state
(d) Increase the kinetic energy of the particles in the vapour phase
(a) Overcome forces of attraction between the liquid particles at the boiling point
Which of the following has highest density?
(a) Kerosene
(b) Water
(c) Iron
(d) Wood
(c) Iron
Dry ice on heating produces:
(a) Liquid CO
(b) Gas CO2
(c) Liquid water
(d) Water vapour
(b) Gas CO2
Particles move randomly in:
(a) Water
(b) Sugar
(c) Nitrogen
(d) Dry ice
(c) Nitrogen
: When we blow air into the balloon it inflates because:
(a) Air particles diffuse into the balloon
(b) Air particles collide with the walls of the balloon and exert pressure on them
(c) Rubber is elastic in nature
(d) The temperature of air in the balloon increases
(b) Air particles collide with the walls of the balloon and exert pressure on them
When a bottle of soda water is opened, carbon dioxide escapes, producing a fizz. This is due to:
(a) Decrease in solubility on decreasing temperature
(b) Decrease in solubility on increasing temperature
(c) Decrease in solubility on decreasing pressure
(d) Decrease in solubility on increasing pressure
(c) Decrease in solubility on decreasing pressure
A mixture of oil and water can be separated by:
(a) Sublimation
(b) Crystallisation
(c) Chromatography
(d) Separating funnel
(d) Separating funnel
Four samples A, B, C, D are prepared by adding a pinch of copper sulphate, a spatula of copper sulphate, a spatula of chalk
powder, and some milk, to water respectively.
3. Which one is the colloidal solution among them?
(a) C
(b) D
(c) B
(d) A
(b) D
Four samples A, B, C, D are prepared by adding a pinch of copper sulphate, a spatula of copper sulphate, a spatula of chalk
powder, and some milk, to water respectively.
Which of these will form a clear and transparent solution:
(a) A
(b) B
(c) A and B
(d) B and D
(c) A and B
Four samples A, B, C, D are prepared by adding a pinch of copper sulphate, a spatula of copper sulphate, a spatula of chalk
powder, and some milk, to water respectively.
Which of these will exhibit the Tyndall effect?
(a) A and D
(b) B and C
(c) A and B
(d) D
(d) D
Which of the following represents a chemical change?
(a) Extraction of copper from copper pyrites
(b) Distillation of water
(c) Melting of wax
(d) Dissolution of salt in water
(a) Extraction of copper from copper pyrites
. The sequence of steps for separating a mixture of salt, sand and camphor is:
(a) Adding water, filtration, evaporation, sublimation
(b) Adding water, filtration, sublimation, evaporation
(c) Sublimation, adding water, filtration, evaporation
(d) Sublimation, adding water, evaporation, filtration
(c) Sublimation, adding water, filtration, evaporation
Which of the following is the correct set of apparatus for fractional distillation?
(a) Round bottomed flask, thermometer, water condenser and beaker
(b) Round bottomed flask, thermometer, air condenser and beaker
(c) Round bottomed flask, thermometer, fractionating column, water condenser and flask
(d) Round bottomed flask, thermometer, fractionating column, air condenser and flask
(c) Round bottomed flask, thermometer, fractionating column, water condenser and flask
In the separation of dyes A and B by chromatography, component B has more solubility in the solvent. Which
component will rise faster?
(a) A
(b) B
(c) Both at the same speed
(d) Separation of dyes is independent of the solubility in solvent
(b) B