Question

assertion reason questions class 9 chapter 1 matter in our surrounding​

Answer 1

question:

1]Assertion: Diffusion occurs readily in gas as compared to solids.

Reason: The particles of gas have greater space between them compared to solids.

2]Assertion: Desert cooler do not work efficiently during rainy season.

Reason: Evaporation is a surface phenomenon.

3]Assertion: Solids have a fixed shape but no fixed volume.

Reason: Particles of solid are closely packed.

4]Assertion: You can easily move your hand through water but in order to move it through a wooden block, you have to be a karate expert.

Reason: Particles of liquid are loosely packed as compared to solids.

Option:

'A' – Both A and R are true and R is the correct explanation of A.

'B' – Both A and R are true but R is NOT the correct explanation of A.

'C' – A is true but R is false.

'D' – A is false but R is true.

'E '– Both A and R are false.

Answer:

1-A

2-B

3-D

4-A

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Answer 2

Matter consists mainly of solid, liquid, and gases.

• Some of the questions of this chapter are:

1. Assertion (A): Matter can exist in all three stages. Reason(R): Water can exist as ice and gaseous form.
2. (A): Physical factors like temperature and pressure affect the state of matter. (R): Matter changes from one state to another when exposed to physical factors.
3. (A): Water evaporation occurs when there is a high temperature. (R): When the temperature is low, evaporation is also low.
4. (A): Molecules in the gaseous state move rapidly. (R): Gaseous state molecules have large interstitial space and therefore, kinetic energy initiates movement.
5. (A): Ice converting to water is called melting. (R): The heat applied will result in breaking the bonds between the molecules of ice, thereby, dissociation of molecules and to another state.