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B. Objective type questions.
1. Write the symbols of the following elements.
b. Oxygen
a. Iron
d. Copper
c. Carbon
f. Zinc
e. Hydrogen
h. Magnesium
g. Sulphur
j. Lead
i. Nitrogen
k. Chlorine
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2. Fill in the blanks using the words from the given li •
unds mixtures,
bol]
'
[diatomic, molecules, impure, compo
elements, monoatomic, compound, elements, sym
a. Pure substances are made up of only one kind of - - - - b. _____ substances consist of two or more kinds of molecules.
c. Pure substances are classified as _ _ _ and _ _ _ __
d. A..........,____ molecule contains two atoms in it.
molecules.
e. Metals are made up oft
_ _ _. . ._\.. . . .,-c,annot be further split into simple substances.
_ _ _ _ of an element repres~nts one atom of the element.
A molecule of a v
tch the following.
'A'
osphorus
ment
ound
bstance
cons1Sts of two or more kinds of atoms.
'B'
--i-)
ii)
iii)
iv)
v)
vi)
Metal
Water
Nonmetal
one kind of atoms
Mono atomic
Air
vii) Diatomic molecules
4. Write •True' [T] or 'False' [F] against each of the following statements.
a. Symbols are abbreviated forms of compounds.
b. Mixtures and compounds are pure substances.
c. Constituent elements of a compound lose their individual properties.
d. Compounds are form<.'d when two or more elements are mechanically mixed.
e. Chemical c01nbination of two or more clements will produce an impure substance.
f.
All n1olccules in a compound have the same composition.
g. Sugar is an example of impure substance.
h. Milk is a pure substance.
1.
Gold is made up of mono atomic molecules.
1. Oxygen molecule is diatomic.
5. Choose the correct answer.
a. A mono atomic element is ...
i. Oxygen
iii. Silver
ii. Nitrogen
iv. Water
b. The short form of the name of the element...
i. Atom
ii. Molecule
iii. Formula
iv. Symbol
c. The symbol of lead is ...
i. Pb
iii. Ld
ii.Lb
iv. Le
d. Which one is a pure substance?
i. Pepsi
iii. Milk
ii. Cane sugar
iv. Honey
e. An example of a compound is ...
i. Water
iii. Honey
ii. Detergent
iv. Milk
f. Which one of these is the smallest and simplest particle?
ii. Molecule
· ~tom
...W.tlement
g. memen_ts and compounds are ...
i. Mixtures
iv. Compound
ii. Mixed substances
iv. impure substances
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D
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B. Objective type questions.
1. Match the following
'A'
a. Solids
b. Liquids
c. Gases
d. Matter
e. Occupies space
'8'
Consists of molccu les
11.
Have definite shape
iii. Matter
I.
iv. Have no definite shape
v. Can occupy any amount of space
2. Fill in the. blanks using the words f rom th e given
.
.
11st.
[~.ros~p~ -~~pe, light~ l~ving, upper free surface, tightly held, Kinetic,
iqui S, 1 se, non-living, occupy, loosely, microscope, telescope]
a. According to the _ _ _ _ _ theory, matter is made up of particles.
b. The particles are
in solids.
c. _ _ _ _ _ _ _ can flow.
'
d. Liquids have only one _ _ _ _ _ __
e. Two gases can _ _ _ _ _ _ into one another.
or - - - - - - f. Matter can be
g. _ _ _ _ _ _ is not matter as it does not _ _ _ _ space.
h. A liquid takes the _ _ _ _ _ of its container.
The molecules of a liquid are _ _ _ _ bound.
1.
Molecules of matter are so small and tiny that they cannot be seen even with the help of
]·
a-'--_ _ _ __
....
3.
Write 'True' [T] or 'False' [F] against each of the following statements.
a. Sound is a form of matter.
b. Molecules can be seen with the help of suitable spectacles or a magnifying glass.
c. Water changes from one state to another in nature.
d. ~t solids have two free surfaces.
e. Gases have no free surface at all.
f. Water is not matter as it changes its state.
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8
g. Liquids are more rigid than solids.
h. Gases are not at all rigid.
i.
Matter can be felt
j.
Solids can be compressed easily whik it is difficult to compress gases.
h)
our senses.
Choose the Correct answer in each of the following.
4.
a. Which one has high rigidity?
i. Water
iii. Stone
iv. Air
b. Which one of these is not a matter?
i. Water
iii. Bread
ii. Apple
iv. Sunlight
ii. Mustard seed
c. Which one of these cannot be seen with our eyes, yet it is matter?
ii. Air
i. Water
iii. Sound
iv. Lemon
d. In liquids, the molecules are ...
i. tightly packed
iii. loosely held
ii. not bound
iv. not present
e. Which state of matter is rigid, cannot be compressed and has a definite shape?
ii. liquids and gases
i. solids and liquids
iv. solids and gases
iii. Solids only
f.
Which state of matter is compressible and has no definite shape and volume?
ii. liquids
i. Solids
iv. gases
iii. liquids and gases
g. Which state of matter cannot diffuse?
i. liquid
111. gases
ii. solids
iv. liquids and gases
h. The state of matter which is highly compressible is ...
i. solids
iii. liquids and gases
·
1.
ii. gases
iv. solids and liquids.
Water cycle in nature is an example of...
i. Matter
.. . Interconversion of matter
111.
ii. Kinetic theory
iv. liquids
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