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MCQ Questions for Class 9 Science with Answers: Chemistry
Q1. The melting point of ice is:
(i) 273.16 K
(ii) 723.16 K
(iii) 263.16 K
(iv) 373 K
(i) 273.16 K
Q2. Find the incorrect statement
(i) Low boiling liquids evaporate faster than high boiling liquids.
(ii) Cooling is caused during boiling
(iii) The normal room temperature is 298 K
(iv) Evaporation is a surface phenomenon but boiling is not
(ii) Cooling is caused during boiling
Q3. Conversion of solid to gas is called
(i) vapourisation
(ii) condensation
(iii) liquefaction
(iv) sublimation.
(iv) sublimation.
Q4. The property of flow is unique to fluids. Which one of the following statements is correct?
(i) Only gases behave like fluids
(ii) Gases and solids behave like fluids
(iii) Gases and liquids behave like fluids
(iv) Only liquids are fluids
(iii) Gases and liquids behave like fluids
Q5. A form of matter has no fixed shape but it has a fixed volume. An example of this form of matter is
(i) Krypton
(ii) Kerosene
(iii) Carbon steel
(iv) Carbon dioxide
(ii) Kerosene
Q6. Which One Of The Following Set Of Phenomena Would Increase On Raising The Temperature?
(i) Diffusion, evaporation, compression of gases
(ii) Evaporation, compression of gases, solubility
(iii) Evaporation, diffusion, expansion of gases
(iv) Evaporation, solubility, diffusion, compression of gases
(iii) Evaporation, diffusion, expansion of gases
Q7. What is the matter?
(i) anything that has mass.
(ii) anything that has volume.
(iii) anything that has mass and volume.
(iv) anything that has mass and volume and occupy space.
(iv) anything that has mass and volume and occupies space.
Q8. Which of the following state is responsible for the glow in the sun and stars?
(i) Solid
(ii) Liquid
(iii) Plasma
(iv) Gas
(iii) Plasma
Q9. The interparticle forces are the strongest in
(i) Ammonia
(ii) Sodium Bromide
(iii) Ethyl alcohol
(iv) Carbon dioxide
(ii) Sodium Bromide
Q10. The formula of hydroxide radical is:
(i) H+
(ii) H3O+
(iii) OH–
(iv) H–.
(iii) OH–
Q11. 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?
(i) Water, air, wind
(ii) Air, sugar, oil
(iii) Oxygen, water, sugar
(iv) Salt, juice, air
(iii) Oxygen, water, sugar
Q12. When water at 0°C freezes to form ice at the same temperature of 0°C, then it:
(i) Absorbs some heat
(ii) Releases some heat
(iii) Neither absorbs nor releases heat
(iv) Absorbs exactly 3.34 x 105J/kg of heat
(ii) Releases some heat
Q13. We cannot see the atom with:
(i) naked eye
(ii) microscope
(iii) electron microscope
(iv) telescope
(i) naked eye
Q14. During summer, water kept in an earthen pot becomes cool because of the phenomenon of:
(i) diffusion
(ii) transpiration
(iii) osmosis
(iv) evaporation
(iv) evaporation
Q15. Which of the following statements is incorrect?
(i) Matter is made up of particles
(ii) Particles of matter are always in state of motion
(iii) Matter is continuous in nature
(iv) Particles of matter attract each other
(iii) Matter is continuous in nature
Q16. The increasing order of inter particle attractions of sugar, oxygen, gold, water is
(i) sugar < oxygen < gold < water
(ii) sugar > oxygen > gold > water
(iii) oxygen < water < sugar < gold
(iv) oxygen > water > sugar > gold.
(iii)
Q17. 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?
(i) 306 K, 329 K and 391 K
(ii) 308 K, 329 K and 392 K
(iii) 308 K, 329 K and 391 K
(iv) 329 K, 392 K and 308 K
(iii) 308 K, 329 K and 391 K
Q18. On converting 308 K, 329 K and 391 K to Celsius scale, the correct sequence of temperatures will be:
(i) 33°C, 56°C and 118°C
(ii) 35°C, 56°C and 119°C
(iii) 35°C, 56°C and 118°C
(iv) 56°, 119°C and 35° C
(iii) 35°C, 56°C and 118°C
Q19. Which of the following phenomena always results in the cooling effect?
(i) Condensation
(ii) Evaporation
(iii) Sublimation
(iv) None of these
(ii) Evaporation
Q20. The matter that has stronger inter particle forces between an iron piece and a chalk piece is:
(i) iron
(ii) chalk piece
(iii) both
(iv) neither.
(i) iron
Q21. The boiling point of water at sea level is
(i) 0°C
(ii) 273 K
(iii) 373 K
(iv) 273°C
(iii) 373 K
Q22. Which of the following phenomena always results in the cooling effect?
(i) Condensation
(ii) Evaporation
(iii) Sublimation
(iv) None of these
(ii) Evaporation
Q23. When water at 0°C freezes to form ice at the same temperature of 0°C, then it:
(i) Absorbs some heat
(ii) Releases some heat
(iii) Neither absorbs nor releases heat
(iv) Absorbs exactly 3.34 x 105J/kg of heat
(ii) Releases some heat
Q24. The type of motion that is present in solids is:
(i) random
(ii) linear (in a straight line)
(iii) vibratory
(iv) circular
(iii) vibratory
Q25. Which of the following conditions is most favourable for converting a gas into a liquid?
(i) High pressure, low temperature
(ii) Low pressure, low temperature
(iii) Low pressure, high temperature
(iv) High pressure, high temperature
(i) High pressure, low temperature
Q26. Which of the following causes the temperature of a substance to remain constant while it is undergoing a change in its state?
(i) Latent heat
(ii) Lattice energy
(iii) Loss of heat
(iv) None of these
(i) Latent heat
Q27. Which of the following will produce severe burns ?
(i) Cold water
(ii) Hot water
(iii) Boiling water
(iv) Steam
(iv) Steam
Q28. Which of the following does not undergo sublimation?
(i) Ammonium chloride
(ii) Sodium chloride
(iii) Solid carbon dioxide
(iv) Iodine
(ii) Sodium chloride
Q29. Dry ice is
(i) water in solid state
(ii) water in gaseous state
(iii) CO2 in liquid state
(iv) CO2 in solid state
(iv)
Q30. Why do naphthalene balls disappear with time without leaving any solid behind?
(i) Due to melting
(ii) Due to freezing
(iii) Due to boiling
(iv) Due to sublimation
(iv) Due to sublimation
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