Class 9 Science MCQ Matter in Our Surroundings

Question : The melting point of ice is:
(a) 273.16 K
(b) 723.16 K
(c) 263.16 K
(d) 373 K

Question : Find the incorrect statement
(a) Low boiling liquids evaporate faster than high boiling liquids.
(b) Cooling is caused during boiling
(c) The normal room temperature is 298 K
(d) Evaporation is a surface phenomenon but boiling is not

Question : Conversion of solid to gas is called
(a) vapourisation
(b) condensation
(c) liquefaction
(d) sublimation.

Question : The property of flow is unique to fluids. Which one of the following statements is correct?
(a) Only gases behave like fluids
(b) Gases and solids behave like fluids
(c) Gases and liquids behave like fluids
(d) Only liquids are fluids

Question : A form of matter has no fixed shape but it has a fixed volume. An example of this form of matter is
(a) Krypton
(b) Kerosene
(c) Carbon steel
(d) Carbon dioxide

Question : Which One Of The Following Set Of 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

Question : What is the matter?
(a) anything that has mass.
(b) anything that has volume.
(c) anything that has mass and volume.
(d) anything that has mass and volume and occupy space.

Question : Which of the following state is responsible for the glow in the sun and stars?
(a) Solid
(b) Liquid
(c) Plasma
(d) Gas

Question : The interparticle forces are the strongest in
(a) Ammonia
(b) Sodium Bromide
(c) Ethyl alcohol
(d) Carbon dioxide

Question : The formula of hydroxide radical is:
(a) H+
(b) H3O+
(c) OH–
(d) H–.

Question : 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

Question : 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

Question : We cannot see the atom with:
(a) naked eye
(b) microscope
(c) electron microscope
(d) telescope

Question : During summer, water kept in an earthen pot becomes cool because of the phenomenon of:
(a) diffusion
(b) transpiration
(c) osmosis
(d) evaporation

Question : Which of the following statements is incorrect?
(a) Matter is made up of particles
(b) Particles of matter are always in state of motion
(c) Matter is continuous in nature
(d) Particles of matter attract each other

Question : The increasing order of inter particle attractions of sugar, oxygen, gold, water is
(a) sugar < oxygen < gold < water
(b) sugar > oxygen > gold > water
(c) oxygen < water < sugar < gold
(d) oxygen > water > sugar > gold.

Question : The boiling points of diethyl ether, acetone and n-butyl alcohol are 35°C, 56°C and 118°C respectively. Which one of the following correctly represents their boiling points in Kelvin scale?
(a) 306 K, 329 K and 391 K
(b) 308 K, 329 K and 392 K
(c) 308 K, 329 K and 391 K
(d) 329 K, 392 K and 308 K

Question : On converting 308 K, 329 K and 391 K to Celsius scale, the correct sequence of temperatures will be:
(a) 33°C, 56°C and 118°C
(b) 35°C, 56°C and 119°C
(c) 35°C, 56°C and 118°C
(d) 56°, 119°C and 35° C

Question : Which of the following phenomena always results in the cooling effect?
(a) Condensation
(b) Evaporation
(c) Sublimation
(d) None of these

Question : The matter that has stronger inter particle forces between an iron piece and a chalk piece is:
(a) iron
(b) chalk piece
(c) both
(d) neither.

Question : The boiling point of water at sea level is
(a) 0°C
(b) 273 K
(c) 373 K
(d) 273°C

Question : Which of the following phenomena always results in the cooling effect?
(a) Condensation
(b) Evaporation
(c) Sublimation
(d) None of these

Question : 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

Question : The type of motion that is present in solids is:
(a) random
(b) linear (in a straight line)
(c) vibratory
(d) circular

Question : Which of the following conditions is most favourable for converting a gas into a liquid?
(a) High pressure, low temperature
(b) Low pressure, low temperature
(c) Low pressure, high temperature
(d) High pressure, high temperature

Question : Which of the following causes the temperature of a substance to remain constant while it is undergoing a change in its state?
(a) Latent heat
(b) Lattice energy
(c) Loss of heat
(d) None of these

Question : Which of the following will produce severe burns ?
(a) Cold water
(b) Hot water
(c) Boiling water
(d) Steam

Question : Which of the following does not undergo sublimation?
(a) Ammonium chloride
(b) Sodium chloride
(c) Solid carbon dioxide
(d) Iodine

Question : Dry ice is
(a) water in solid state
(b) water in gaseous state
(c) CO₂ in liquid state
(d) CO₂ in solid state

Question : Why do naphthalene balls disappear with time without leaving any solid behind?
(a) Due to melting
(b) Due to freezing
(c) Due to boiling
(d) Due to sublimation