AP 7th Class Science Bits Chapter 17 Changes Around Us with Answers

Practice the AP 7th Class Science Bits with Answers Chapter 17 Changes Around Us on a regular basis so that you can attempt exams with utmost confidence.

AP State Syllabus 7th Class Science Bits 17th Lesson Changes Around Us with Answers

Choose the correct answer.

Question 1.
Rust is
A) Iron
B) Oxygen
C) Water
D) Iron Oxide
Answer:
D) Iron Oxide

Question 2.
Depositing one metal on another metal is
A) Physical change
B) Rusting
C) Galvanisation
D) None
Answer:
C) Galvanisation

Question 3.
This metal is generally used for Galvanisation.
A) Magnesium
B) Zinc
C) Iron
D) Aluminium
Answer:
B) Zinc

Question 4.
……………… prevents the outer surface of potato from colouring.
A) Grease
B) Paint
C) Cold water
D) Zinc
Answer:
C) Cold water

Question 5.
Ascorbic acid is
A) Vitamin A
B) Vitamin B
C) Vitamin D
D) Vitamin C
Answer:
D) Vitamin C

Question 6.
Magnesium Hydroxide is
A) Acidic
B) Salt
C) Basic
D) Neutral
Answer:
C) Basic

Question 7.
Lime water changes to milky is a
A) Physical change
B) Chemical change
C) Slow change
D) Speed change
Answer:
B) Chemical change

Question 8.
Ripening of fruits is a
A) Chemical change
B) Physical change
C) Natural change
D) All the above
Answer:
A) Chemical change

Question 9.
Action of heat on paraffin wax is
A) permanent
B) physical change
C) chemical change
D) none of the above
Answer:
B) physical change

Question 10.
In a physical change
A) change in composition
B) energy is released
C) energy is absorbed
D) no change in composition
Answer:
D) no change in composition

Question 11.
Burning of sulphur in air is
A) physical change
B) temporary change
C) chemical change
D) not possible
Answer:
C) chemical change

Question 12.
The colour of magnesium oxide is
A) Red
B) White
C) Yellow
D) Green
Answer:
B) White

Question 13.
Rusting of iron is
A) chemical change
B) temporary change
C) physical change
D) not possible
Answer:
A) chemical change

Question 14.
Physical change is
A) permanent
B) temporary
C) both A & B
D) none
Answer:
B) temporary

Question 15.
Melting of wax is
A) physical change
B) chemical change
C) both A & B
D) none
Answer:
A) physical change

Question 16.
The chemical name of lime is
A) calcium
B) calcium oxide
C) calcium hydroxide
D) calcium hydride
Answer:
C) calcium hydroxide

Question 17.
Gas absorbed by white wash on the wall is
A) oxygen
B) carbondioixide
C) carbon monoxide
D) none
Answer:
B) carbondioixide

Question 18.
S + O₂
A) So
B) S₂O
C) SO₄
D) SO₂
Answer:
D) SO₂

Question 19.
Through this image we can understand that
AP 7th Class Science Bits Chapter 17 Changes Around Us with Answers 1
A) water can available in 3 states.
B) on heating ice turns into water.
C) water can change its state from one to another.
D) All of these
Answer:
D) All of these

Question 20.
The experiment in this image can write as following equation
AP 7th Class Science Bits Chapter 17 Changes Around Us with Answers 2
A) vinegar + baking soda → carbondioxide + other substances
B) copper sulphate + iron → iron sulphate + copper
C) magnesium + oxygen → megnesium oxide
D) magnesium oxide + water → magnesium hydroxide
Answer:
C) magnesium + oxygen → megnesium oxide

Question 21.
In this experiment nail turns into
AP 7th Class Science Bits Chapter 17 Changes Around Us with Answers 3
A) blue colour
B) green colour
C) brown colour
D) white colour
Answer:
C) brown colour

Question 22.
In this experiment the colour of water turns as follows
AP 7th Class Science Bits Chapter 17 Changes Around Us with Answers 4
A) From blue to green
B) From green to blue
C) From blue to brown
D) From green to red
Answer:
A) From blue to green

Question 23.
In this experiment which gas is produced
AP 7th Class Science Bits Chapter 17 Changes Around Us with Answers 5
A) oxygen
B) carbondioxide
C) hydrogen
D) nitrogen
Answer:
B) carbondioxide

Question 24.
In this experiment what are the liquids in the first, and second test tubes?
AP 7th Class Science Bits Chapter 17 Changes Around Us with Answers 6
A) Acid and Base
B) Base and Acid
C) Acid and Acid
D) Base and Base
Answer:
A) Acid and Base

Question 25.
In this picture what changes do you observe?
AP 7th Class Science Bits Chapter 17 Changes Around Us with Answers 7
A) Chemical change
B) Permanent change
C) Both A & B
D) Physical change
Answer:
C) Both A & B

Question 26.
What is the experiment in this diagram?
AP 7th Class Science Bits Chapter 17 Changes Around Us with Answers 8
A) Crystallization
B) Galvanisation
C) Corrosion
D) Rust
Answer:
A) Crystallization

Question 27.
In the physical change, change occurs in
A) shape of substance
B) size of substance
C) colour of substance
D) all of these
Answer:
D) all of these

Question 28.
In which change new substance is formed
A) Physical
B) Chemical
C) Biological
D) Both A & B
Answer:
B) Chemical

Question 29.
In a change the following may be produce
A) light
B) heat
C) sound
D) all of these
Answer:
D) all of these

Question 30.
Through crystallization we can separate
A) a soluble solid from the solution.
B) an insoluble solid from the solution.
C) a soluble liquid from the solution.
D) an insoluble liquid from the solution.
Answer:
A) a soluble solid from the solution.

Question 31.
In the Galvanisation process which metal is used for depositing on iron.
A) Copper
B) Gold
C) Mercury
D) Zinc
Answer:
D) Zinc

Question 32.
Ice melts in to water, it is a
A) physical change
B) Reversible change
C) Slow change
D) All of these
Answer:
D) All of these

Question 33.
The end product of this experiment
AP 7th Class Science Bits Chapter 17 Changes Around Us with Answers 9
A) Zinc oxide
B) Copper sulphate
C) Magnesium oxide
D) Magnesium hydroxide
Answer:
D) Magnesium hydroxide

Question 34.
The liquid taken in this beaker is
AP 7th Class Science Bits Chapter 17 Changes Around Us with Answers 10
A) Copper sulphate
B) Magnesium oxide
C) Vinegar
D) Lime water
Answer:
A) Copper sulphate

Question 35.
When turmeric is added with lime water it turns into colour
A) yellow colour
B) white colour
C) red colour
D) green colour
Answer:
C) red colour

Question 36.
The rust is chemically
A) Magnesium oxide
B) Iron oxide
C) Zinc oxide
D) Calcium oxide
Answer:
B) Iron oxide

Question 37.
Which substance is responsible for rusting?
A) Air
B) Water
C) Colour
D) Gas
Answer:
B) Water

Question 38.
Through galvanisation we can protect
A) Iron
B) Zinc
C) Copper
D) Gold
Answer:
A) Iron

Question 39.
When your mother cuts the brinjals, it turns into brownish. To avoid this we should
A) Put into salt water
B) Put into lemon water
C) Vinegar mixed water
D) All of the above
Answer:
D) All of the above

Question 40.
The process of depositing a metal on other metal is called
A) Chlorination
B) Galvanisation
C) Oxidation
D) Ventilation
Answer:
B) Galvanisation

Question 41.
Which of these substances is formed when we burn Magnesium ribbon?
A) Magnesium Oxide
B) Magnesium Chloride
C) Magnesium Sulphate
D) Mangenese Oxide
Answer:
A) Magnesium Oxide

Question 42.
Carbon dioxide + Lime water → ________ + Water.
A) Calcium carbonate
B) Calcium chloride
C) Carbon chloride
D) Carbon monoxide
Answer:
A) Calcium carbonate

Question 43.
The process of depositing zinc metal on iron is called ________
A) Crystallization
B) Galvanisation
C) Sublimation
D) Rusting
Answer:
B) Galvanisation