Matter in Our Surroundings MCQ Questions for Class 9 Science Chapter 1 with Answers

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MCQ Questions for Class 9 Science with Answers: Chemistry

Q1. 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

Q2. The melting point of ice is:

(A) 273.16 K
(B) 723.16 K
(C) 263.16 K
(D) 373 K

Q3. Dry ice is

(A) water in solid state
(B) water in gaseous state
(C) CO2 in liquid state
(D) CO2 in solid state

Q4. 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

Q5. Which of the following does not undergo sublimation?

(A) Ammonium chloride
(B) Sodium chloride
(C) Solid carbon dioxide
(D) Iodine

Q6. Conversion of solid to gas is called

(A) vapourisation
(B) condensation
(C) liquefaction
(D) sublimation.

Q7. Which of the following will produce severe burns ?

(A) Cold water
(B) Hot water
(C) Boiling water
(D) Steam

Q8. 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

Q9. 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

Q10. 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

Q11. 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

Q12. 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

Q13. The type of motion that is present in solids is:

(A) random
(B) linear (in a straight line)
(C) vibratory
(D) circular

Q14. 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.

Q15. 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

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