Class 9 Science Is Matter Around us Pure
Class 9 Science Is Matter Around us Pure Fill in the blanks , MCQ , True false and Extra question answers.
Fill in the Blanks
1. A mixture contains more than one __________. Answer: substance
2. A __________ is a homogeneous mixture. Answer: solution
3. The substance that dissolves is called __________. Answer: solute
4. The substance in which solute dissolves is called __________. Answer: solvent
5. A __________ solution has the same composition throughout. Answer: homogeneous
6. Salt mixed with water is a __________ mixture. Answer: homogeneous
7. Oil and water form a __________ mixture. Answer: heterogeneous
8. Milk is an example of a __________. Answer: colloid
9. A __________ is a mixture where particles are large and visible. Answer: suspension
10. The scattering of light by colloids is called the __________ effect. Answer: Tyndall
11. A substance made of only one kind of particle is called a __________ substance.
Answer: pure
12. Elements cannot be broken into __________ substances. Answer: simpler
13. __________ is the only metal that is liquid at room temperature. Answer: Mercury
14. Air is a mixture of several __________. Answer: gases
15. __________ can be separated by physical methods. Answer: Mixtures
Multiple Choice Questions
1. Which of the following is a homogeneous mixture?
a) Soil
b) Air
c) Oil and water
d) Sand and salt
Answer: b) Air
2. The solute in saltwater is:
a) Water
b) Salt
c) Sugar
d) Sand
Answer: b) Salt
3. Which is not a pure substance?
a) Water
b) Iron
c) Air
d) Oxygen
Answer: c) Air
4. Colloids show:
a) Magnetic effect
b) Gravitational effect
c) Tyndall effect
d) Electric effect
Answer: c) Tyndall effect
5. Which of the following is a compound?
a) Salt water
b) Iron
c) Sugar
d) Soil
Answer: c) Sugar
6. Which is an example of a suspension?
a) Salt water
b) Milk
c) Muddy water
d) Lemonade
Answer: c) Muddy water
7. In a solution, the component in more quantity is called:
a) Solute
b) Mixture
c) Solvent
d) Colloid
Answer: c) Solvent
8. Which one is a heterogeneous mixture?
a) Sugar solution
b) Air
c) Vinegar
d) Sand and water
Answer: d) Sand and water
9. Milk is a:
a) Solution
b) Suspension
c) Colloid
d) Element
Answer: c) Colloid
10. A saturated solution has:
a) No solute
b) Extra solvent
c) Maximum solute dissolved
d) Less solvent
Answer: c) Maximum solute dissolved
11. Which of these is not an element?
a) Copper
b) Mercury
c) Salt
d) Gold
Answer: c) Salt
12. Which can be separated using filtration?
a) Salt solution
b) Sugar solution
c) Muddy water
d) Air
Answer: c) Muddy water
13. A physical change does not change:
a) Shape
b) Size
c) Chemical nature
d) State
Answer: c) Chemical nature
14. Which is a chemical change?
a) Boiling of water
b) Melting of ice
c) Burning of paper
d) Dissolving salt
Answer: c) Burning of paper
15. Metals are:
a) Poor conductors
b) Non-malleable
c) Sonorous
d) Dull
Answer: c) Sonorous
True or False
1. Milk is a homogeneous mixture. False
2. Sugar dissolves in water to form a solution. True
3. Suspension particles can be seen with naked eyes. True
4. Salt water shows Tyndall effect. False
5. A compound has variable composition. False
6. All mixtures are pure substances. False
7. Elements can be broken down into simpler substances. False
8. Metals are good conductors of heat and electricity. True
9. Tyndall effect is shown by colloids. True
10. A colloid appears clear like a solution. False
11. Mixtures can be separated by physical methods. True
12. Air is a heterogeneous mixture. False
13. Burning of wood is a physical change. False
14. Ice, water, and steam are chemically the same. True
15. Alloy is a mixture. True
Class 9 Science Is Matter Around us Pure Que Ans
1. What is a mixture?
A mixture is made of two or more substances mixed together.It can be separated by physical methods.
2. What is a pure substance?
A pure substance has only one kind of particle.Its properties are the same throughout.
3. What is a solution?
A solution is a homogeneous mixture.It looks the same throughout and has solute and solvent.
4. What is the Tyndall effect?
The scattering of light by colloid particles is the Tyndall effect.It makes the light beam path visible.
5. Give one example of a colloid.
Milk is an example of a colloid.It looks uniform but is a heterogeneous mixture.
6. What is a solute?
A solute is the substance that dissolves in a solvent.Like salt in saltwater.
7. What is a solvent?
A solvent is the substance that dissolves the solute.Like water in saltwater.
8. What is a suspension?
A suspension is a mixture where particles are large and settle down.Muddy water is an example.
9. What is an element?
An element is a substance made of only one type of atom.It cannot be broken down further.
10. What is a compound?
A compound is made by chemically joining two or more elements.It has different properties than its elements.
11. Is air a mixture or pure substance? Why?
Air is a mixture because it has many gases.These gases can be separated by physical methods.
12. Why is alloy a mixture?
Alloy is a mixture of metals or metal with non-metal.It has properties of all the elements in it.
13. What is a saturated solution?
A saturated solution cannot dissolve more solute at that temperature.Extra solute settles down.
14. What is a homogeneous mixture?
A mixture where all parts look the same is homogeneous.Like sugar dissolved in water.
15. What is a heterogeneous mixture?
A mixture with visible different parts is heterogeneous.Like sand mixed with salt.
