Changes Around Us Physical and Chemical Class 7 MCQ Science Chapter 5

By tackling these Class 7 Science MCQ and Changes Around Us Physical and Chemical Class 7 Science Curiosity Chapter 5 MCQ Online Test with Answers, students will build a solid foundation in the topic.

Class 7 Science Chapter 5 Changes Around Us Physical and Chemical MCQ

Changes Around Us Physical and Chemical MCQ

Class 7 Science Chapter 5 MCQ Online Test

Question 1.
Which of the following is an example of physical change?
(a) Rusting of Iron
(b) Changing milk to curd
(c) Melting of ice
(d) Burning of paper
Answer:
(c) Melting of ice

Question 2.
How does chemical changes are identified?
(a) Size of substaince changes
(b) New substance forms
(c) State of substance changes
(d) Colour of substance changes
Answer:
(b) New substance forms

Question 3.
Essential for combustion
(a) Only combustible substance
(b) Only oxygen
(c) Only ignition temperature
(d) Combustible substance, oxygen and ignition temperature
Answer:
(d) Combustible substance, oxygen and ignition temperature

Question 4.
Which of the following is an irreversible change?
(a) Changing water into ice
(b) Ripening of fruit
(c) Stretching of rubber band
(d) Boiling of water in a covered pan
Answer:
(b) Ripening of fruit

Question 5.
What happens if CO, gas is passed in lime water?
(a) It turns milky
(b) It turns blue
(c) It turns yellow
(d) No change
Answer:
(a) It turns milky

Question 6.
Which change is included in burning of candle?
(a) Only physical
(b) Only chemical
(c) Both physical and chemical
(d) None
Answer:
(c) Both physical and chemical

Question 7.
Ignition temperature is
(a) Maximum temperature
(b) Minimum temperature on which a substance starts to bum
(c) Room temperature
(d) Melting point of a substance
Answer:
(b) Minimum temperature on which a substance starts to bum

Question 8.
Which of the following is not a combustible substance?
(a) Wood
(b) Paper
(c) Water
(d) Petrol
Answer:
(c) Water

Question 9.
What forms when magnesium ribbon bums?
(a) Magnesium carbonate
(b) Magnesium oxide
(c) Magnesium hydroxide
(d) Magnesium chloride
Answer:
(b) Magnesium oxide

Question 10.
Weathering is
(a) Breaking of rocks
(b) Formation of soil
(c) Flowing of river
(d) Raining
Answer:
(a) Breaking of rocks

Question 11.
Which of the following is a desirable change?
(a) Rusting
(b) Cooking
(c) Curdling of milk
(d) Rotting of fruits
Answer:
(b) Cooking

Question 12.
Gas emitted by the reaction of baking soda and vinegar is
(a) Oxygen
(b) Hydrogen
(c) Nitrogen
(d) Carbon dioxide
Answer:
(d) Carbon dioxide

Question 13.
Reason behind shining of fireflies is
(a) Physical change
(b) Bioluminescence
(c) Combustion
(d) Withering
Answer:
(b) Bioluminescence

Question 14.
Which of the following is a reversible change?
(a) Changing of water into vapour
(b) Boiling of egg
(c) Rusting of iron
(d) Changing milk into curd.
Answer:
(a) Changing of water into vapour

Question 15.
A candle lit off when covered because
(a) Temperature decreases
(b) Wick finishes
(c) Wax finishes
(d) Flow of oxygen stops
Answer:
(d) Flow of oxygen stops

Changes Around Us Physical and Chemical Class 7 Fill in the blanks

Question 1.
A change in which a new substance forms is called a ______ change.
Answer:
chemical

Question 2.
For combustion ______ oxygen and ignition temperature are essential.
Answer:
combustible substance

Question 3.
Burning of magnesium forms ______ oxide.
Answer:
magnesium

Question 4.
Passing through CO₂ in lime water makes it ______
Answer:
milky

Question 5.
The minimum temperature on which any substance starts burning is called.
Answer:
ignition temperature

Question 6.
Melting of ice is a ______ change.
Answer:
physical

Question 7.
Shining of fireflies is called ______ .
Answer:
Bioluminescence

Question 8.
Formation of soil by breaking rocks is called ______.
Answer:
weathering

Changes Around Us Physical and Chemical Class 7 True or False

Question 1.
Combustion is a physical change. (True/False)
Answer:
False

Question 2.
Melting of ice is a reversible change. (True/False)
Answer:
True

Question 3.
Rusting in iron is a desirable change. (True/False)
Answer:
False

Question 4.
There is only chemical change in burning of candle. (True/False)
Answer:
False

Question 5.
Weathering is a physical change in nature. (True/False)
Answer:
False

Changes Around Us Physical and Chemical Class 7 Match the following

Column ‘A’	Column ‘B’
1. Mchingoficc	(a) Chemical change
2. Rusting ofiron	(b) Physical change
3. Formation of soil	(c) Combustible substance
4. Fuel	(d) Weathering

Answer:

Column ‘A’	Column ‘B’
1. Mchingoficc	(b) Physical change
2. Rusting ofiron	(a) Chemical change
3. Formation of soil	(d) Weathering
4. Fuel	(c) Combustible substance