N.C.E.R.T Class 9 Science
Sample Paper 4
MARKS : 80 DURATION
: 3 HRS
Section A
Each
question carriers 1 mark 10
X 1 = 10M
1.
To make a saturated Solution, 36 gm
of sodium chloride is dissolved in 100 gm ofwater at 293 K. Find its
concentration at this temperature.
2.
How will you separate a mixture
containing kerosene and petrol (difference in theirboiling points is more than
25ºC), which are miscible with each other?
3.
Name the technique to separate (a)
butter from curd, (b) salt from sea-water, (c) camphor from salt.
4.
On the basis of Thomson’s model of an
atom, explain how the atom is neutral as a whole?
5.
Name the three sub-atomic particles
of an atom.
6.
If K and L shells of an atom are
full, then what would be the total number of electronsin the atom?
7.
Where is apical meristem found?
8.
What does a neuron look like?
9.
What do you mean by acceleration due
to gravity?
10.
What do you mean by buoyancy?
Each question carriers 2 marks: 8 X 2 = 16 M
1. Calculate
the number of aluminium ions present in 0.051 g of aluminium oxide. (Hint: The
mass of an ion is the same as that of an atom of the same element. Atomic mass
of Al = 27 u)
2. Why
solid ice does changes its state when it is kept at room temperature and also
explain when does it get evaporated?
3. What
are canal rays?
4. On
the basis of Rutherford’s model of an atom, which subatomic particle is present
in the
5. nucleus
of an atom?
6. Write
the difference between mixture and a compound?
7. Write
the distribution of electrons in carbon and sodium atom?
8. What
are the limitations of Rutherford’s model of the atom?
Each question carriers 3 marks: 8 X 3 = 24M
1. Why
is the weight of an object on the moon 1/6th its weight on the earth?
2. An
object thrown at a certain angle to the ground moves in a curved path and
fallsback to the ground. The initial and the final points of the path of the
object lie on the same horizontal line. What is the work done by the force of
gravity on the object?
3. A
battery lights a bulb. Describe the energy changes involved in the process.
4. Write
an expression for the kinetic energy of an object.
5. Give
reasons for the following observation: The smell of hot sizzling food
reachesyou several metres away, but to get the smell from cold food you have to
go close.
6. Give
reasons
a) A
gas fills completely the vessel in which it is kept.
b) A
gas exerts pressure on the walls of the container.
7. Convert
the following Temperature to Celsius scale:
a) 300
K
b) 573
K
8. Suggest
a method to liquefy atmospheric gases.
Each
question carriers 5 marks 5 x 3 = 15 M
1. Arrange
the following substances in increasing order of forces of attraction between
the particles - water, sugar, oxygen.
2. Give
two reasons to justify
a) Water
at room temperature is a liquid.
b) An
iron almirah is a solid at room temperature.
3. Differentiate
between homogeneous and heterogeneous mixtures with examples.
Section B
Choose the correct answers: 15x 1= 15 M
1.
Which of the following will show
“Tyndall effect”?
a) Salt
Solution
b) Milk
c) Copper
sulphate Solution
d) Starch
Solution
2.
Identify the Solutions among the
following mixtures.
a) Soil
b) Sea
water
c) Air
d) Coal
e) Soda
water
3.
Calculate the number of moles of
sodium hydroxide, NaOH, corresponding to 10.84 ×1023 formula units of NaOH.
a) 1.8
mol
b) 0.56
mol
c) 65
mol
d) 1.5
mol
4.
Reptiles are ____________blooded
animals
a) Cold-
blooded animals
b) Warm
blooded animals
c) Both
A & B
d) None
of these
5.
Iron rusts as iron atoms react with
oxygen in the air. Which of the following forms ofiron would rust the fastest?
a) Iron
fillings
b) Iron
nail
c) Thin
iron plate
d) Solid
iron cube
6.
A chlorine atom has the electron
configuration of [Ne]3s2 , 3p5.According to the
valence-bond theory, the covalent bond in a molecule of chlorine(Cl2)
forms from
a) A
3p orbital from one chlorine atom only.
b) A
hybrid of 3p orbitals and 2p orbitals.
c) The
overlap of two 3p orbitals, one from each chlorine atom.
d) A
hybrid between a 3s orbital and a 3p orbital.
e) The
overlap of two 3s orbitals, one from each chlorine atom.
7.
Which of these values is smallest?A.
The number of known atoms
a) The
numbers of mixtures
b) The
number of known elements
c) The
number of pure substances
8.
The chemical symbol for chlorine is
Cl. The symbol below describes chlorine–In every neutral atom, the number of
protons always equals the number of
a) Electrons
plus or minus
b) Electrons.
c) Neutrons
d) Electrons
plus neutrons.
e) Neutrons
minus electrons.
9.
During which of the following
processes is energy absorbed?
I.
Boiling
II.
condensing
III.
evaporating
IV.
freezing
V.
melting
VI.
sublimating
a) I,
II, V, VI only
b) II
and IV only
c) I,
IV, and V only
d) II,
III, and IV only
10.
Which of the following elements has
the highest electronegativity?
a) sulfur
(S)
b) chlorine
(Cl)
c) oxygen
(O)
d) fluorine
(F)
11.
Newton's _________ law of motion
states that "The acceleration of an object asproduced by a net force is
directly proportional to the magnitude of the net force, in the same direction
as the net force, and inversely proportional to the mass of the object."
a) First
b) Second
c) Third
d) Fourth
12.
A group of tissues working together
is _______
a) a
cell
b) organelle
c) a
compound
d) an
organ
13.
Who is considered as “father of
Taxonomy
a) Carl
Linnaeus
b) Whittaker
c) Charles
Darwin
d) Mendel
14.
Hydra belongs to ___________Phyla.
a) Porifera
b) Nematoda
c) Platyhelminthes
d) Coelenterate
15.
Give the names of the elements
present in the following compounds:
a) Quick
lime
b) Hydrogen
bromide
c) Baking
powder
d) Potassium
sulphate
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