Class 9 Science Chapter 1 MCQ (Multiple Choice Questions) of Matter in Our Surroundings. Prepare here for school exams 2023-24 and class test with objective type questions with explanation and answers. All the MCQs are taken from NCERT Textbook only and answers also confined to course book of standard 9 science. These questions not only ensure you scoring good marks but it clears all doubts related to chapter 1 of grade 9 science.

Class 9 Science Chapter 1 MCQ Online Test

Class: 9Science
Chapter: 1Matter in Our Surroundings
Contents:MCQ Online Test with answers
Session:Year 2023-24

Class 9 Science Chapter 1 MCQ with Answers for 2023-24

Class 9 Science Chapter 1 MCQ Online Test with answers and explanation. All the questions are taken from intext and Exercises part of NCERT Books for class 9 Science issued for academic session 2023-24. Explanation of answers will help you to understand questions in depth. Practice these questions to score more in less time.

Q1

Consider the following statements and choose the incorrect one:

[A]. The particles which make up matter are atoms or molecules.
[B]. The evidence for the existence of particles in matter and their motion comes from the experiments on diffusion and Brownian motion.
[C]. When a crystal of potassium permanganate is placed in a beaker of water, the water slowly turns purple on its own.
[D]. The bromine vapor is less-heavier than air.
Q2

Which condition out of the following will increase the evaporation of water?

[A]. Increase in temperature of water
[B]. Decrease in temperature of water
[C]. Less exposed surface area of water
[D]. Adding common salt to water
Q3

Which of the following statement is or are incorrect?

[A]. The pollen grains move on the surface of water because they are constantly being hit by the fast-moving particles of water.
[B]. When a beam of Sunlight enters a room, we can see tiny dust particles suspended in air which are moving rapidly in a very haphazard way.
[C]. The zigzag movement of the small particles suspended in a liquid or gas is called Brownian motion.
[D]. The particles of matter do not attract each other.
Q4

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
Q5

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, 392 K
[C]. 308 K, 329 K, 391 K
[D]. 329 K, 392 K, 308 K
Q6

Choose the correct statement of the following:

[A]. Conversion of solid into vapours without passing through the liquid state is called vapourisation.
[B]. Conversion of vapours into solid without passing through the liquid state is called sublimation.
[C]. Conversion of vapours into solid without passing through the liquid state is called freezing.
[D]. Conversion of solid into liquid is called sublimation.
Q7

Gunja is completed her science chapter where she wrote some statements. She wants to know whether the statements are correct or not? Gunja wants to take help from you:

[A]. There are some forces of attraction between the particles of matter which bind them together.
[B]. The force of attraction is maximum in the particles of solid matter and minimum in the particles of gases matter.
[C]. A material which can flow easily and requires a vessel to keep it called fluid.
[D]. All the above
Q8

When heat is constantly supplied by a burner to boiling water, then the temperature of water during vaporization:

[A]. Rises very slowly
[B]. Rises rapidly until steam is produced
[C]. First rises and then becomes constant
[D]. Does not rise at all
Q9

On converting 25°C, 38°C and 66°C to Kelvin scale, the correct sequence of temperature will be

[A]. 298 K, 311 K and 339 K
[B]. 298 K, 300 K and 338 K
[C]. 273 K, 278 K and 543 K
[D]. 298 K, 310 K and 338 K
Q10

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
Q11

The evaporation of water increases under the following conditions:

[A]. Increase in temperature, decrease in surface area
[B]. Increase in surface area, decrease in temperature
[C]. Increase in surface area, rise in temperature
[D]. Increase in temperature, increase in surface area, addition of common salt
Q12

During summer, water kept in an earthen pot becomes cool because of the phenomenon of

[A]. Diffusion
[B]. Transpiration
[C]. Osmosis
[D]. Evaporation
Q13

Priya is writing some statements, choose the correct statement and help him:

[A]. We are able to sip hot tea faster from a saucer than from a cup.
[B]. A desert cooler cools better on a hot and dry day.
[C]. A fan increases the rate of evaporation of sweat or moisture from our skin and make us feel cool and comfortable.
[D]. All the above.
Q14

In a quiz competition, you are asked a question where you have to choose the statement which is/ are correct?

[A]. Ammonia gas can be liquefied by applying high pressure and lowering the temperature.
[B]. Solid carbon dioxide is stored under less-high pressure.
[C]. The conversion of solid carbon dioxide into carbon dioxide gas is a change of state which is caused by the increase in pressure and decrease atmospheric temperature.
[D]. Whatever be the temperature at which evaporation take place, the latent heat of vaporization need not be supplied whenever a liquid change into vapour or gas.
Q15

When a gas jar containing colourless air is kept upside down over a gas jar full of brown-coloured bromine vapour, then after some time, the brown colour of bromine vapour spreads into the upper gas jar making both the gas jars appear brown in colour. Which of the following conclusion obtained from these observations is incorrect?

[A]. Bromine vapour is made of tiny particles which are moving
[B]. Air is made up of tiny particles which are moving
[C]. The particles of bromine are moving but those of air are not moving
[D]. Even though bromine vapour is heavier that air, it can move up against gravity
Q16

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
Q17

Pankush appeared in class test but he confused to know the correct statement. Would you help him to know that?

[A]. Perspiration or sweating is our body’s method of maintaining a constant temperature.
[B]. All the water on the earth does not get evaporated due to the high value of the latent heat of vaporization of water.
[C]. During hot summer days, water is usually kept in an earthen pot to keep it cool.
[D]. All the above
Q18

In the last year board examination, Rahul were asked a question where he had to choose the statement which was/were incorrect? Will you be able to answer this question?

[A]. To convert a temperature on Celsius scale to the Kelvin scale we have to subtract 273 to the Celsius temperature.
[B]. The process of changing a gas or vapour to a liquid by cooling is called vaporization.
[C]. Temperature and pressure are the two factors which decide whether a substance would be in a solid, liquid or gaseous state.
[D]. The temperature at which a liquid boils and changes rapidly into a gas at atmospheric pressure is called boiling point of the liquid.
Q19

When a gas jar full of air is placed upside down on a gas jar full of bromine vapors, the red-brown vapors 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
Q20

Pooja is writing some statements but she confused to know whether the statements are correct or not? If you know the answer to this question, then tell her:

[A]. The process of liquid changing into vapour or gas even below its boiling point is called evaporation.
[B]. The rate of evaporation increases on increasing the temperature of the liquid.
[C]. The rate of evaporation decreases on increasing the surface area of the liquid.
[D]. When the humidity of air is low then the rate of evaporation is high and water evaporates more easily.
Q21

In the last year board examination, Rahul were asked a question where he had to choose the statement which was/were correct? Will you be able to answer this question?

[A]. The temperature at which a solid substance melts and changes into a liquid at atmospheric pressure is called melting point of the substance.
[B]. When a solid is heated sufficiently it changes its physical state and becomes a liquid.
[C]. The melting point of a solid is a measure of the force of attraction between its particles as atoms or molecules.
[D]. All the above.
Q22

Anju is completed her science chapter where she wrote some statements. She wants to know whether the statements are correct or not? Anju wants to take help from you:

[A]. According to the kinetic theory of matter the particles of matter are in continuous motion and causes kinetic energy.
[B]. The spreading out and mixing of a substance with another substance due to the motion of its particles is called diffusion.
[C]. The rate of diffusion increases on increasing the temperature of the diffusing substance by heating.
[D]. The smell of perfume spreads due to the evaporation of perfume into air.
Q23

Read the following sentences carefully, and choose the correct one:

[A]. The spreading of purple colour of potassium permanganate into water, on its own, is due to the diffusion of potassium permanganate particles into water.
[B]. The spreading of ink in water, on its own, is due to the diffusion of ink particle into water.
[C]. The diffusion of a solid substance into another solid substance is so slow that many people think that diffusion does not take place in solids.
[D]. All the above.
Q24

Puja is writing some statements but she confused to know whether the statements are correct or not? If you know the answer to this question, then tell her:

[A]. When a liquid freeze to form a solid an equal amount of heat is given out.
[B]. Ice at 0 degree Celsius is more effective in cooling a substance than water at 0 degree Celsius.
[C]. The latent heat of vaporization of water is 22.5 x 10 to the power 5 J/kg.
[D]. Once the water has begun to boil, the temperature gradually rises at hundred degree Celsius until all the water has changed into steam but many people thinks it remains constant.
Q25

In the last year board examination, Rahul were asked a question where he had to choose the statement which was/were incorrect? Will you be able to answer this question?

[A]. The latent heat of fusion of ice is 3.34 x 10 to the power 5 J/kg.
[B]. Heat energy is used up in changing the state of the solid substance by overcoming the force of attraction between its particles.
[C]. When water changes into steam, it absorbs latent heat, but when steam condenses to form water, and equal amount of latent heat is given out.
[D]. It has been found that the burns caused by boiling of water are much more severe than those caused by steam.

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Why do gases exert pressure on the walls of container as in 9th Science Chapter 1?

In the gaseous state, the particles move about randomly at high speed and because of this random movement, the particles hit each other and also the walls of the container. That is why, they exert pressure on the walls of container.

What do you understand by latent heat of fusion given in NCERT Class 9 Science Chapter 1?

The amount of heat energy that is required to change 1 kg of a solid into liquid at atmospheric pressure at its melting point is known as the latent heat of fusion.

What is Dry Ice according to 9th Science chapter 1?

Solid CO2 gets converted directly to gaseous state on decrease of pressure to 1 atmosphere without coming into liquid state. This is known as Dry Ice.

What do you know about the state of Plasma as given in 9th Science Chapter 1?

The state consists of super energetic and super excited particles. These particles are in the form of ionised gases. The plasma glows with a special colour depending on the nature of gas. The Sun and the stars glow because of the presence of plasma in them. The plasma is created in stars because of very high temperature.

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Last Edited: June 10, 2023