100% FREE ACCESS6th Standard CBSE Syllabus & Materials
6th Standard CBSE
CBSE 6th Social Science The Value of Work - New Sample Question Papers Study Material - QB365 Set A
NEW6th Standard CBSE
CBSE 6th Social Science Family and Community - New Sample Question Papers Study Material - QB365 Set A
NEW6th Standard CBSE
CBSE 6th Social Science India's Cultural Roots - New Sample Question Papers Study Material - QB365 Set A
NEW6th Standard CBSE
CBSE 6th Social Science India,That is Bharat - New Sample Question Papers Study Material - QB365 Set A
NEW6th Standard CBSE
CBSE 6th Social Science Timeline and sources of history - New Sample Question Papers Study Material - QB365 Set A
NEW6th Standard CBSE
CBSE 6th Social Science Oceans and Continents - New Sample Question Papers Study Material - QB365 Set A
Published on: 03/08/2019
Changes Around Us
Download CBSE Class 6th Standard CBSE Science question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 6th Standard CBSE Science
Questions + Answers key
Take MCQ Science Test
1.
Some bags of cement lying on the floor get wet due to the leakage of tap water in the room. The next day, they are kept in the sunshine. Do you think the changes, that have occurred in the cement could be reversed?
2.
A drawing sheet changes when you draw a picture on it. Can you reverse this change?
3.
An iron ring is heated. Which of the following statements about it is incorrect?
The ring expands
The ring almost comes to the same size on cooling
The change in this case is reversed
The ring changes its shape and the change can not be reversed
4.
Which one of the steps while burning a candle is not reversible?
Melting of solid wax
Wax vapour burn into flame
Liquid wax changes into vapours
All of the above
5.
Rolling of chapati and baking of chapati are the changes that
can be reversed
cannot be reversed
can be reversed and cannot be reversed respectively
cannot be reversed and can be reversed respectively
6.
An iron ring is heated. Which of the following statements about it is incorrect?
The ring expands
The ring almost comes to the same size on cooling
The change in this case is reversed
The ring changes its shape and the change cannot be reversed
7.
Pick the change that can be reversed from the following.
Cutting of trees
Melting of ghee
Burning of candle
Blooming of flower
8.
Physical changes can not be reversed while chemical changes can be reversed
9.
Drying of clothes is a physical and an irreversible change
10.
Paper burning into ash is a irreversible change.
11.
When ice melts to form water, then a change occurs in its state.
12.
Water change in vapour when cooled.
13.
Burning of candle is ________ process
14.
Liquids _____ on freezing
15.
Burning of paper is a ________change.
16.
Formation of curd from milk is a ________________change.
17.
Formation of rust on iron nail is a____________ change.
18.
How does a blacksmith change a piece of iron into different tools?
19.
Explosion of a cracker is a chemical change. Explain
20.
Suppose you have dropped your favorite toy and broken it. Can this change be reversed?
21.
An object expands on heating. Write one use of it
22.
A change occurs during the growth of plants. What type of change it is?
23.
In the given table, check whether the given changes can be reversed or not.
| Change | Can be reversed |
|---|---|
| Raw egg to boiled egg | Yes/No |
| Batter to Idli | |
| Wet clothes to dry clothes | |
| Woollen yarn to knitted sweater | |
| Grain to its flour | |
| Cold milk to hot milk | |
| Straight string to a coiled string | |
| Bud to flower | |
| Milk to paneer | |
| Cowdung to biogaes | |
| Stretched rubber band to its | |
| normal size | |
| Ice cream to molten ice cream |
24.
Give one example in each case.
(a) Change which occurs on heating but can be reversed.
(b) Change which occurs on heating but cannot be reversed.
(c) Change which occurs on cooling but can be reversed.
(d) Change which occurs on mixing two substances but can be reversed.
(e) Change which occurs on mixing two substances but cannot be reversed.
1.
Cement bags are converted into a hard mass due to the chemical reaction with water. Anew product is formed, which has entirely different properties. So it being a chemical changes cannot be reversed.
2.
We can reverse this change only if pencil is used for drawing by using eraser. If pen or paint is used for drawing, then we cannot reverse this change.
3.
(d)
The ring changes its shape and the change can not be reversed
4.
(b)
Wax vapour burn into flame
5.
(c)
can be reversed and cannot be reversed respectively
6.
(d)
The ring changes its shape and the change cannot be reversed
7.
(b)
Melting of ghee
8.
(b)
9.
(b)
10.
(a)
11.
(a)
12.
(b)
13.
( )
irreversible
14.
( )
solidify
15.
( )
chemical
16.
( )
chemical
17.
( )
chemical
18.
A piece of iron is heated till it becomes red-hot. Then this red-hot iron, which is quite soft, is beaten into desired shapes
19.
When we burn a cracker, it explodes. Heat, light and smoke come out after explosion. Many new products are formed. Hence, it is a chemical change.
20.
No, this change cannot be reversed because the toy cannot be repaired to its previous form
21.
The expansion of an object on heating is used for fixing of iron rim to the wooden wheel of a cart.
22.
It is an irreversible change. A tree cannot be reversed back into a plant or seed. Therefore, growth of a plant is an irreversible change.
23.
| Change | Can be reversed |
|---|---|
| Raw egg to boiled egg | No |
| Batter to Idli | No |
| Wet clothes to dry clothes | Yes |
| Woollen yarn to knitted sweater | Yes |
| Grain to its flour | No |
| Cold milk to hot milk | Yes |
| Straight string to a coiled string | Yes |
| Bud to flower | No |
| Milk to paneer | No |
| Cowdung to biogas | No |
| Stretched rubber band to its | Yes |
| Ice cream to molten ice cream | Yes |
24.
The example of each case is as follows:
(a) Heating of an iron rod
(b) Baking of chapati
(c) Formation of ice from water
(d) Formation of salt solution
(e) Mixing of cement and water
6th Standard CBSE Syllabus & Materials
6th Standard CBSE
CBSE 6th Social Science Locating Places on the Earth - New Sample Question Papers Study Material - QB365 Set A
NEW6th Standard CBSE
CBSE 6th Science A Journey Through States of Water - New Sample Question Papers Study Material - QB365 Set A
NEW6th Standard CBSE
CBSE 6th Science Temperature and its Measurement - New Sample Question Papers Study Material - QB365 Set A
NEW6th Standard CBSE
CBSE 6th Science Materials Around Us - New Sample Question Papers Study Material - QB365 Set A
CBSE 6th Standard CBSE Subjects
CBSE Standards
