Class 9 Science Chapter 1 MCQ (Multiple Choice Questions) of Matter in Our Surroundings. Prepare here for school exams or 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 for 2022-2023

Class: 9Science
Chapter: 1Matter in Our Surroundings
Contents:MCQ Online Test with answers

Class 9 Science Chapter 1 MCQ with Answers for 2022-23

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 2022-2023. Explanation of answers will help you to understand questions in depth. Practice these questions to score more in less time.

Q1

In which of the following conditions, the distance between the molecules of hydrogen gas would increase?

[A]. Increasing pressure on hydrogen contained in a closed container and Increasing the volume of the container of hydrogen gas.
[B]. Increasing pressure on hydrogen contained in a closed container and Adding more hydrogen gas to the container without increasing the volume of the container.
[C]. Some hydrogen gas leaking out of the container and Increasing the volume of the container of hydrogen gas
[D]. Some hydrogen gas leaking out of the container and Adding more hydrogen gas to the container without increasing the volume of the container
Q2

When heat is constantly supplied by a gas burner with small flame to melt ice, then the temperature of ice during melting:

[A]. Increases very slowly
[B]. Does not increase at all
[C]. First remains constant and then increases
[D]. Increases to form liquid water
Q3

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
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

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 × 10 to the power 5 J/kg of heat
Q7

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.
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

Consider the following statements and choose the correct one(s):

[A]. The space between the particles are the minimum in solids, a little more in liquids and the maximum in gases.
[B]. The forces of attraction between the particles are the strongest in solids, less strong in liquids, and negligible in gases.
[C]. The movement of particles is the minimum in solids, more in liquids and maximum in gases.
[D]. All the above.
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

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

[A]. The sun and other stars glow because of the presence of plasma in them.
[B]. Plasma can also be made on the earth by passing electricity through gases at very low pressure taken in a glass tube.
[C]. Plasma is a fifth state of matter.
[D]. None of the above.
Q12

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.
Q13

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.
Q14

Which of the following statement is incorrect?

[A]. The particles of matter are very, very small
[B]. The particles of matter attract one another
[C]. The particles of some of the matter are moving constantly
[D]. The particles of all the matter have spaces between them
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

Which of the following represent the suitable conditions for the liquefaction of gases?

[A]. Low temperature, low pressure
[B]. High temperature, low pressure
[C]. Low temperature, high pressure
[D]. High temperature, high pressure
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

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
Q19

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.
Q20

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
Q21

Which one of the following statements is not true?

[A]. The molecules in a solid vibrate about a fixed position
[B]. The molecules in a liquid are arranged in a regular pattern
[C]. The molecules in a gas exert negligibly small forces on each other, except during collisions
[D]. The molecules of a gas occupy all the space available
Q22

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.
Q23

Consider the following statements and choose the correct one(s):

[A]. The heat energy which has to be supplied to change the state of a substance is called its latent heat.
[B]. The latent heat which we supply is used up in overcoming the forces of attraction between the particles of substance during the change of state.
[C]. The latent heat which is given to change the state of a substance can be detected by a thermometer.
[D]. All the above.
Q24

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.
Q25

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.

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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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