WorksheetsRTYA 1 Revision- 7th
Total questions: 20
Worksheet time: 19mins
Q. Answer the following questions with reference to the chapter "Matter and its Composition":
The change of vapour state to liquid state on cooling is called
Sublimation
Deposition
Vaporization
Liquefaction
What is the conclusion of this experiment ?
Solids do not have mass
Solids can't occupy space
Solids occupy space
Solids have mass
Which state of matter has large kinetic energy ?
Solid
Liquid
Gas
a molecule
a element
In which state of matter do particles have the least kinetic energy?
solids
liquids
gases
Change of state from vapour to liquid:
(a)
Describe the density of gases (one-word answer)
(a)
Describe the number of free surfaces a liquid has. (in word)
(a)
What does this experiment depict?
Intermolecular space
Intermolecular force of attraction
Solids have space
Solids have mass
Which of the three states of matter has particles moving in neither their own positions nor in any random direction?
(a)
Q. Answer the following questions with reference to the chapter "Physical and Chemical Change":
Which of the following types of changes produce good results?
Desirable change
Undesirable change
Positive change
Periodic change
Broken glass is a
chemical change
physical change
Cutting a log in to small pieces is a chemical change.
true
false
Which of the following is a physical change?
Rusting of iron
Melting of wax
Burning of coal
Curdling of milk
Which of the following is/are true when milk changes to curd?
(i) Its state is changed from liquid to semi solid
(ii) It changes color
(iii) It changes taste
(iv) The change cannot be reversed.
Choose the correct option from the ones given below:
(i) and (ii) are correct
(ii) and (iii) are correct
(i), (iii) and (iv) are correct
All are correct
A physical change is named as such because __________.
it involves changes in physical properties of a substance
it is accompanied by a transfer of energy
it is a reversible process
it involves the formation of new products
What is the process called when a solid changes directly into a gas?
Liquefaction
Freezing
Which of the following is an example of a sublimable substance?
Common salt (sodium chloride)
Which type of energy changes taking place during a physical change?
Uses energy
Absorbs energy
Forms energy
Releases energy
In a chemical change,
Chemical composition is not altered
Physical properties are altered
New substances are formed
It is irreversible.
