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Chemistry Practice Questions

NCERT Class IX Chapter 1: Matter in Our Surroundings

Created & Curated By S.K. Sinha

Section A: Questions
Q1.
Which one of the following sets of phenomena would increase on raising the temperature?
(A) Diffusion, evaporation, compression of gases
(B) Evaporation, diffusion, expansion of gases
(C) Evaporation, compression of gases, solubility
(D) Evaporation, solubility, diffusion, compression of gases
Q2.
Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions:
(A) Low temperature, low pressure
(B) High temperature, low pressure
(C) Low temperature, high pressure
(D) High temperature, high pressure
Q3.
The property to 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
Q4.
During summer, water kept in an earthen pot becomes cool because of the phenomenon of:
(A) Diffusion
(B) Transpiration
(C) Osmosis
(D) Evaporation
Q5.
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
Q6.
On converting 25°C, 38°C and 66°C to kelvin scale, the correct answer is:
(A) 298 K, 311 K, 339 K
(B) 273 K, 278 K, 543 K
(C) 298 K, 300 K, 338 K
(D) 273 K, 298 K, 311 K
Q7.
Which condition out of the following will increase the evaporation of water?
(A) Increase in temperature of water
(B) Decrease in humidity of air
(C) Increase in surface area of water
(D) All of the above
Q8.
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
(A) (i) and (iii)
(B) (i) and (iv)
(C) (ii) and (iii)
(D) (ii) and (iv)
Q9.
Which of the following statements are true for particles of matter?
(i) Particles of matter have space between them
(ii) Particles of matter are continuously moving
(iii) Particles of matter attract each other
(A) (i) and (ii)
(B) (i) and (iii)
(C) (ii) and (iii)
(D) (i), (ii) and (iii)
Q10.
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, 391 K
(B) 308 K, 329 K, 391 K
(C) 308 K, 329 K, 392 K
(D) 329 K, 392 K, 308 K
Q11.
Which of the following are matter?
Chair, air, love, smell, hate, almonds, thought, cold, cold-drink, smell of perfume.
(A) Chair, air, almonds, cold-drink
(B) Air, love, smell, almonds
(C) Chair, air, love, smell, hate, almonds, thought, cold, cold-drink, smell of perfume
(D) Chair, air, almonds, cold-drink, smell of perfume
Q12.
Which of the following conditions is most favourable for converting a gas into liquid?
(A) High pressure and high temperature
(B) High pressure and low temperature
(C) Low pressure and high temperature
(D) Low pressure and low temperature
Q13.
At room temperature the forces of attraction between the particles of solid substances are:
(A) Stronger than those which exist in the gaseous state
(B) Weaker than those which exist in the gaseous state
(C) Same as those which exist in the gaseous state
(D) Weaker than those which exist in the liquid state
Q14.
The mass per unit volume of a substance is called:
(A) Weight
(B) Volume
(C) Density
(D) Relative density
Q15.
Which of the following phenomenon would occur when a small amount of acid or base is added to water?
(A) Ionisation
(B) Neutralisation
(C) Dilution
(D) Salt formation
Q16.
The temperature at which liquid changes into gaseous state at atmospheric pressure is called:
(A) Melting point
(B) Boiling point
(C) Evaporation point
(D) Sublimation point
Q17.
Which of the following represents the correct relationship between Celsius and Kelvin scales of temperature?
(A) K = °C - 273
(B) K = °C + 273
(C) °C = K - 273
(D) Both (B) and (C)
Q18.
The intermolecular forces are strongest in:
(A) Solids
(B) Liquids
(C) Gases
(D) All have equal intermolecular forces
Q19.
The process of changing of water into its vapour is called:
(A) Sublimation
(B) Fusion
(C) Vapourisation
(D) Condensation
Q20.
Dry ice is solid carbon dioxide. At room temperature and pressure, carbon dioxide is a gas. What is special about dry ice?
(A) Dry ice melts to become liquid carbon dioxide
(B) Dry ice sublimes to become gaseous carbon dioxide
(C) Dry ice evaporates to become liquid carbon dioxide
(D) None of the above
Q21.
When we make tea, coffee or lemonade (nimbu paani), particles of one type of matter get into the spaces between particles of the other. This shows that:
(A) Particles of matter are very small
(B) Particles of matter have space between them
(C) Particles of matter are always moving
(D) Particles of matter attract each other
Q22.
A gas exerts pressure on the walls of the container because:
(A) Gas has weight
(B) Gas molecules have kinetic energy
(C) Gas molecules collide with each other
(D) Gas molecules collide with the walls of the container
Q23.
Which of the following is NOT a characteristic of particles of matter?
(A) They have space between them
(B) They are always at rest
(C) They attract each other
(D) They are very small
Q24.
The kinetic energy of particles:
(A) Decreases with increase in temperature
(B) Increases with increase in temperature
(C) First increases then decreases with temperature
(D) Remains constant with change in temperature
Q25.
Which of the following has definite shape and definite volume?
(A) Solid
(B) Liquid
(C) Gas
(D) Plasma
Section B: Answers
Question Answer
Q1 (B)
Q2 (C)
Q3 (C)
Q4 (D)
Q5 (C)
Q6 (A)
Q7 (D)
Q8 (C)
Q9 (D)
Q10 (B)
Q11 (D)
Q12 (B)
Q13 (A)
Q14 (C)
Q15 (C)
Q16 (B)
Q17 (D)
Q18 (A)
Q19 (C)
Q20 (B)
Q21 (B)
Q22 (D)
Q23 (B)
Q24 (B)
Q25 (A)
Section C: Solutions
Q1.
Higher temperature increases kinetic energy, enhancing evaporation, diffusion, and gas expansion.
Q2.
Gas liquefies under low temperature (reduces kinetic energy) and high pressure (compresses molecules).
Q3.
Fluids flow due to weak intermolecular forces; both gases and liquids are fluids.
Q4.
Water evaporation from pot's pores absorbs heat, cooling remaining water.
Q5.
Increasing order: gas (oxygen) < liquid (water) < solid (sugar).
Q6.
K = °C + 273; 25+273=298K, 38+273=311K, 66+273=339K.
Q7.
Higher temperature, lower humidity, and larger surface area all increase evaporation rate.
Q8.
Gas leaking out and increasing volume both decrease density, increasing intermolecular distance.
Q9.
All three are fundamental properties of matter particles according to kinetic theory.
Q10.
35+273=308K, 56+273=329K, 118+273=391K.
Q11.
Matter has mass and occupies space; emotions, thoughts, and cold are not matter.
Q12.
High pressure compresses gas; low temperature reduces kinetic energy for liquefaction.
Q13.
Solids have strongest intermolecular forces, maintaining fixed shape and volume.
Q14.
Density = mass/volume, a characteristic property of substances.
Q15.
Adding small amounts to water reduces concentration through dilution.
Q16.
Boiling point is temperature at which liquid vapor pressure equals atmospheric pressure.
Q17.
Both K = °C + 273 and °C = K - 273 are correct conversion formulas.
Q18.
Solids have particles closely packed with strongest intermolecular attractions.
Q19.
Vaporization includes both evaporation and boiling processes.
Q20.
Dry ice directly converts from solid to gas without melting (sublimation).
Q21.
Mixing demonstrates intermolecular spaces where particles can accommodate.
Q22.
Moving gas molecules collide with container walls, exerting pressure.
Q23.
Particles are in constant random motion, never at rest.
Q24.
Higher temperature increases particle kinetic energy and motion.
Q25.
Solids have fixed shape and volume due to strong intermolecular forces.

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