Download App

Science M.C.Q-[Che-1M]

Matter in Our Surroundings · CBSE STD 9 (CBSE - English Medium). 31 questions.

Questions

M.C.Q-[Che-1M]

Take a timed test

31 questions · self-marked practice — reveal the answer and mark yourself.

Question 11 Mark
Which one of the following statements is not true?
  1. The molecules in a solid vibrate about a fixed position.
  2. The molecules in a liquid are arranged in a regular pattern.
  3. The molecules in a gas exert negligibly small forces on each other, except during collisions.
  4. The molecules of a gas occupy all the space available.
Answer
  1. The molecules in a liquid are arranged in a regular pattern.

Explanation:

The above answer is not true because in liquids the molecules are not arranged in regular pattern. In liquids the molecules are loosely arranged.

View full question & answer→
Question 21 Mark
Which one of the following statement is correct in respect of fluids?
  1. Only gases behave as fluids.
  2. Gases and solids behave as fluids.
  3. Gases and liquids behave as fluids.
  4. Only liquids are fluids.
Answer
  1. Gases and liquids behave as fluids.

Explanation:

Gases and liquids behave as fluids because fluids are the substances that have the ability to flow. Gases and liquids can flow easily because their particles are free to move.

View full question & answer→
Question 31 Mark
Which one of the following set of phenomena would increase on raising the temperature?
  1. Diffusion, evaporation, compression of gases.
  2. Evaporation, compression of gases, solubility.
  3. Evaporation, diffusion, expansion of gases.
  4. Evaporation, solubility, diffusion, compression of gases.
Answer
  1. Evaporation, diffusion, expansion of gases.

Explanation:

The rates of evaporation, diffusion and expansion of gases increases due to increase in temperature because when temperature increases the kinetic energy of molecules increases, which breaks or weakens the interaction between the atoms and sets the molecules free.

View full question & answer→
Question 41 Mark
Which of the following statement is incorrect?
  1. The particles of matter are very, very small.
  2. The particles of matter attract one another.
  3. The particles of some of the matter are moving constantly.
  4. The particles of all the matter have spaces between them.
Answer
  1. The particles of some of the matter are moving constantly.

Explanation:

The statement that the particles of some forms of matter move constantly is incorrect because the particles of matter of all three states–solid, liquid and gas are moving constantly. Although the particles of solids are fixed at their positions, they vibrate constantly.

View full question & answer→
Question 51 Mark
Which of the following represent the suitable condition for the liquefaction of gases?
  1. Low temperature, low pressure.
  2. High temperature, low pressure.
  3. Low temperature, high pressure.
  4. High temperature, high pressure.
Answer
  1. Low temperature, high pressure.

Explanation:

With the help of experiments it can be shown that at low temperature and high pressures, gases will liquefy. Because these factors affect the interaction force of molecules i.e. the molecules are able to establish a force of attraction between them on lowering the temperature and increasing pressure.

View full question & answer→
Question 61 Mark
Which of the following process/ processes release heat?
  1. Condensation.
  2. Vaporization.
  3. Freezing.
  4. Melting.
  1. Only (i)
  2. Only (iv)
  3. (i) and (iii)
  4. (ii) and (iv)
Answer
  1. (i) and (iii)

Explanation:

Both condensation and freezing release heat that lead to decrease in kinetic energy of molecules. When the substance gets cool enough its particles become slower or stop their movement and change their phase into liquid and solid on condensing and freezing respectively.

View full question & answer→
Question 71 Mark
Which of the following factors are responsible for the change in state of solid carbon dioxide when kept exposed to air?
  1. Increase in pressure
  2. Increase in temperature
  3. Decrease in pressure
  4. Decrease in temperature
  1. (i) and (ii)
  2. (i) and (iii)
  3. (ii) and (iii)
  4. (ii) and (iv)
Answer
  1. (ii) and (iii)

Explanation:

Increase in temperature and decrease in pressure are the two factors responsible for the change of solid carbon dioxide into gas.

View full question & answer→
Question 81 Mark
Which of the following energy is absorbed during the change of state of a substance?
  1. Specific heat.
  2. Latent heat.
  3. Heat capacity.
  4. Heat of solution.
Answer
  1. Latent heat.

Explanation:

Latent heat is absorbed because during change of state because it is the heat energy that has to be supplied to change the state of a substance.

View full question & answer→
Question 91 Mark
Which of the following are also considered to be the states of matter?
  1. Plasma.
  2. Platelets.
  3. BFC.
  4. BHC.
  1. (i) and (ii)
  2. (ii) and (iii)
  3. (i) and (iii)
  4. (ii) and (iv)
Answer
  1. (i) and (iii)

Explanation:

Plasma and BEC (Bose Einstein condensate) are also considered as states of matter because plasma is mixture of free atoms and ions and BEC occupies space and has mass.

View full question & answer→
Question 101 Mark
When water at 0°C freezes to form ice at the same temperature of 0°C, then it:
  1. Absorbs some heat.
  2. Releases some heat.
  3. Neither absorbs nor releases heat.
  4. Absorbs exactly 3.34 × 105J/ kg of heat.
Answer
  1. Releases some heat.

Explanation:

At 0°C, water releases some heat to lower the speed of molecules, and when it is cool enough the molecules of water are fixed at one position and they start vibrating. Ultimately, the water molecules convert into ice (solid).

View full question & answer→
Question 111 Mark
When heat is constantly supplied by a gas burner with small flame to melt ice, then the temperature of ice during melting:
  1. Increases very slowly.
  2. Does not increase at all.
  3. First remains constant and then increases.
  4. Increases to form liquid water.
Answer
  1. Does not increase at all.

Explanation:

During melting, temperature of the ice does not change at all because the heat is used in overcoming the particle-particle attraction forces, which in turn keeps the temperature constant.

View full question & answer→
Question 121 Mark
When heat is constantly supplied by a burner to boiling water, then the temperature of water during vaporisation:
  1. Rises very slowly.
  2. Rises rapidly until steam is produced.
  3. First rises and then becomes constant.
  4. Does not rise at all.
Answer
  1. Does not rise at all.

Explanation:

Temperature of the water during vaporisation does not change at all because the heat is used in overcoming particle-particle attraction forces, which in turn keeps the temperature constant.

View full question & answer→
Question 131 Mark
When a gas jar full of air is placed upside down on a gas jar full of bromine vapours, the red-brown vapours of bromine from the lower jar go upward into the jar containing air. In this experiment:
  1. Air is heavier than bromine.
  2. Both air and bromine have the same density.
  3. Bromine is heavier than air.
  4. Bromine cannot be heavier than air because it is going upwards against gravity.
Answer
  1. Bromine is heavier than air.

Explanation:

The process occurring here is diffusion and it is unaffected by the mass. Therefore, bromine being heavier, mixes with the colourless air.

View full question & answer→
Question 141 Mark
When a gas jar containing colourless air is kept upside down over a gas jar full of brown-coloured bromine vapour, then after sometime, 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?
  1. Bromine vapour is made of tiny particles which are moving.
  2. Air is made up of tiny particles which are moving.
  3. The particles of bromine are moving but those of air are not moving.
  4. Even though bromine vapour is heavier than air, it can move up against gravity.
Answer
  1. The particles of bromine are moving but those of air are not moving.

Explanation:

The statement that the particles of bromine are moving but those of air are not moving is incorrect because the particles of matter are constantly in motion. It appears as if the air molecules are not moving because air is colourless.

View full question & answer→
Question 151 Mark
When a crystal of potassium permanganate is placed at the bottom of water in a beaker, the water in the whole beaker turns purple on its own, even without stirring. This is an example of:
  1. Distribution.
  2. Intrusion.
  3. Diffusion.
  4. Effusion.
Answer
  1. Diffusion.

Explanation:

Both water and potassium permanganate are made up of tiny particles. The particles of potassium permanganate are coloured while those of water are colorless. When the crystals of potassium permanganate are kept in water, the purple-coloured crystals of potassium permanganate break further into smaller particles that occupy the space between the molecules of water imparting a purple colour to the water.

View full question & answer→
Question 161 Mark
The latent heat of vaporization of water is:
  1. 22.5 × 106J/ kg
  2. 3.34 × 106J/ kg
  3. 22.5 × 104J/ kg
  4. 3.34 × 105J/ kg
Answer
  1. 22.5 × 106J/ kg

Explanation:

This value is fixed and is found by performing the experiment in the lab.

View full question & answer→
Question 171 Mark
The latent heat of fusion of ice is:
  1. 3.34 × 105J/ kg
  2. 22.5 × 105J/ kg
  3. 3.34 × 104J/ kg
  4. 22.5 × 104J/ kg
Answer
  1. 3.34 × 104J/ kg

Explanation:

This value is fixed and is found by performing the experiment in lab.

View full question & answer→
Question 181 Mark
The evaporation of water increases under the following conditions:
  1. Increase in temperature, decrease in surface area.
  2. Increase in surface area, decrease in temperature.
  3. Increase in surface area, rise in temperature.
  4. Increase in temperature, increase in surface area, addition of common salt.
Answer
  1. Increase in surface area, rise in temperature.

Explanation:

When surface area increases and temperature rises, evaporation of water increases because the area which is exposed to the outer atmosphere is more and increasing the temperature leads to increase in the kinetic energy, due to which rate of evaporation increases.

View full question & answer→
Question 191 Mark
The conversion of a solid into vapours without passing through the liquid state is called:
  1. Vaporization.
  2. Fusion.
  3. Sublimation.
  4. Freezing.
Answer
  1. Sublimation.

Explanation:

The transformation of a solid directly into vapour, on heating, is known as sublimation.

View full question & answer→
Question 201 Mark
The boiling point of ethane is, -88°C. This temperature will be equivalent to:
  1. 285K
  2. 288K
  3. 185K
  4. 361K
Answer
  1. 185K

Explanation:

We have to add 273 to the given value to get the answer i.e. -88 + 273 = 185K

View full question & answer→
Question 211 Mark
The best evidence for the existence and movement of particles in liquids was provided by:
  1. John Dalton.
  2. Ernest Rutherford.
  3. J.J. Thomson.
  4. Robert Brown.
Answer
  1. Robert Brown.

Explanation:

The best evidence for the existence and movement of particles in liquids was provided by the Robert Brown. For this experiment, he used pollen grains in water.

View full question & answer→
Question 221 Mark
Out of the following, an example of matter which can be termed as fluid is:
  1. Carbon.
  2. Sulphur.
  3. Oxygen.
  4. Phosphorus.
Answer
  1. Oxygen

Explanation:

Oxygen can be considered to be a fluid because oxygen is a gas and its particles are completely free to move. So, they have the ability to flow.

View full question & answer→
Question 231 Mark
One of the following does not undergo sublimation. This one is:
  1. Iodine.
  2. Sodium chloride.
  3. Ammonium chloride.
  4. Camphor.
Answer
  1. Sodium chloride.

Explanation:

Sodium chloride does not undergo sublimation because it does not show direct change from solid state to liquid state.

View full question & answer→
Question 241 Mark
On converting 308K, 329K and 391K to Celsius scale, the correct sequence of temperatures will be:
  1. 33°C, 56°C and 118°C
  2. 35°C, 56°C and 119°C
  3. 35°C, 56°C and 118°C
  4. 56°C, 119°C and 35°C
Answer
  1. 35°C, 56°C and 118°C

Explanation:

Just subtract 273K from the given values to get the answer.

View full question & answer→
Question 251 Mark
On converting 25°C, 38°C and 66°C to Kelvin scale, the correct sequence of temperatures will be:
  1. 298K, 311K and 339K
  2. 298K, 300K and 338K
  3. 273K, 278K and 543K
  4. 298K, 310K and 338K
Answer
  1. 298K, 311K and 339K

Explanation:

To convert the temperature scale from Celsius scale to Kelvin scale, just add 273K to the given values. Therefore, the temperature in Kelvin scale of 25°C, 38°C and 66°C will be 298K, 311K and 339K, respectively.

View full question & answer→
Question 261 Mark
In which of the following conditions, the distance between the molecules of hydrogen gas would increase?
  1. Increasing pressure on hydrogen contained in a closed container.
  2. Some hydrogen gas leaking out of the container.
  3. Increasing the volume of the container of hydrogen gas.
  4. Adding more hydrogen gas to the container without increasing the volume of the container.
  1. (i) and (ii)
  2. (i) and (iv)
  3. (ii) and (iii)
  4. (ii) and (iv)
Answer
  1. (ii) and (iii)

Explanation:

The condition in which hydrogen gas would leak out of the container or if there is an increase in volume of the container in which hydrogen is present, would bring about more distance between the molecules of hydrogen gas.

View full question & answer→
Question 271 Mark
If the temperature of an object is 268K, it will be equivalent to:
  1. -5°C
  2. +5°C
  3. 368°C
  4. -25°C
Answer
  1. -5°C

Explanation:

We have to subtract 273 from the given value to get the answer i.e. 268 - 273 = -5°C

View full question & answer→
Question 281 Mark
During summer days, water kept in an earthen pot (pitcher) becomes cool because of the phenomenon of:
  1. Diffusion
  2. Transpiration.
  3. Osmosis.
  4. Evaporation.
Answer
  1. Evaporation.

Explanation:

An earthen pot has a large number of extremely small pores on its wall. Some of the water continuously keeps seeping through these pores. This water evaporates continuously and takes the latent heat required for vaporization from the earthen pot and the remaining water. In this way, the remaining water loses heat and gets cooled.

View full question & answer→
Question 291 Mark
During respiration, glucose and oxygen enter our body cells and waste products carbon dioxide and water leave the body cells by the process of:
  1. Effusion.
  2. Osmosis.
  3. Diffusion.
  4. Plasmolysis.
Answer
  1. Diffusion.

Explanation:

Because diffusion is a process in which there is a movement of particles from a region of high concentration to the one with low concentration across the cell membrane.

View full question & answer→
Question 301 Mark
A form of matter has no fixed shape but it has a fixed volume. An example of this form of matter is:
  1. krypton.
  2. kerosene.
  3. Carbon steel.
  4. Carbon dioxide.
Answer
  1. Kerosene.

Explanation:

Liquids have no fixed shape but have a fixed volume. Among the given options, only kerosene is a liquid.

View full question & answer→
Question 311 Mark
A few substances are arranged in the increasing order of ‘forces of attraction’ between their particles. Which one of the following represents the correct arrangement?
  1. Water, air, wind.
  2. Air, sugar, oil.
  3. Oxygen, water, sugar.
  4. Salt, juice, air.
Answer
  1. Oxygen, water, sugar.

Explanation:

The above order is correct because the forces of attraction is more in solids compared to liquids and gases. Forces of attraction is least in gases.

View full question & answer→
Generate Paper FreeAll Matter in Our Surroundings topics
M.C.Q-[Che-1M] - Science STD 9 Questions - Vidyadip