Matter in Our Surroundings MCQ

Matter in Our Surroundings MCQ / Objective questions Chapter 1 Class 9 Science

What will be the volume of water in the beaker if we add one teaspoon of salt in it?

  • a. Increase
  • b. Decrease
  • c. No change

c. No change
Water has large inter molecular spaces. Salt molecules fill into that void, leading to no change in the volume.

What will happen to volume if we keep adding salt to the beaker in above question?

  • a. Increase
  • b. Decrease
  • c. No. change
  • d. Negligible increase

a. Increase
After continuously adding salt to water, at time comes when all the voids are full. Beyond this salt settle to the bottom. Beyonfd the addition of salt increases the volume of beaker.

In which conditions solubility of a substance will increase?

  • a. Increase in temperature. 
  • b. Increase in pressure.
  • c. Decrease in temperature
  • d. None

a. Increase in temperature. 
Increase in temperature and decrease in pressure increases the intermolecular distance. As a result mole solute partcles can be added.

Heating the bottom of steel pot filled with water heats the water at top also. This happens due to:

  • a. Conduction
  • b. Convection
  • c. Radiation
  • d. None

b. Convection
Bottom of the pot heats the water at bottom. Hot water is lighter and travel to the surface. The process is termed convection.

Which among these will have no shape but fixed volume

  • a. An aluminum pot.
  • b. An iron chisel.
  • c. Mustard oil
  • d. Plastic bottle

c. Mustard oil
Liquids do not have fixed shape. They change their shape as per the surrounding. Here, mustard in a pot will acquire the shape of pot and if filled in the bottle it will change the shape to that of  a bottle.

Heat transfer from one terminals of a long iron rod to another is due to:

  • a. Conduction
  • b. Convection
  • c. Radiation
  • d. None

a. Conduction
In metals free electron oscillate and transfer energy to nearby molecule. The process is called conduction.

Which among these will have maximum kinetic energy?

  • a. Solid
  • b. Liquid
  • c. Gas
  • d. All have same kinetic energy.

c. Gas
Matter in Our Surroundings MCQ

Heating ice convert ice into water. This energy is constant and is equal to

  • a. 224 joule/gm
  • b. 334 joule/gm
  • c. 2230 joule/gm
  • d. 2434 joule/gm

b. 334 joule/gm
This energy is latent heat of fusion. For water it eauals to 334 joule/gm.

Which among these will be a more complicated mishap

  • a. Burn due to spillage of hot water
  • b. Spillage of boiling water
  • c. Exposure of heated steam at 100ºc
  • d. None

c. Exposure of heated steam
There will be a difference equal to latent heat of vaporization between boiling water and steam at 100 degree celcius. So, steam will harm more.

Which process cause wind to blow?

  • a. Conduction
  • b. Convection
  • c. Radiation
  • d. None
b. Convection

Which among these will have highest force of intermolecular attraction?

  • a. An iron rod
  • b.  100 ml water
  • c. Carbon dioxide produced by fire extinguisher
  • d. ALl three have equal intermolecular force of attraction.
a. An iron rod

 

See also:

Matter in Our Surroundings MCQ / Objective questions Chapter 1 Class 9 Science

Ref: Chapter 1.

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