THE INDIAN SCHOOL, KINGDOM OF BAHRAIN
TERM II EXAMINATION-MARCH 2022
SCIENCE
CLASS: IX
MAX. MARKS: 40
TIME: 2 Hours
General instructions:
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2.
3.
4.
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6.
Question paper comprises of 3 sections- Section A, Section B and Section C.
Section- A Physics carries 14 marks.
Section – B Chemistry carries 18 marks.
Section – C Biology carries 8 marks.
All questions are compulsory.
Choices have been provided for some questions. A student has to attempt
only one of the alternatives in such questions.
SECTION- A
PHYSICS
1
2
Write any two differences between mass and weight.
I.
II.
3
2
Two identical packets are dropped from same height, one above 2
the equator and the other above the South Pole. Assuming all
other physical conditions are identical, will these packets take
same time to reach the surface of earth? Justify your answer.
OR
Amit buys few grams of gold at the poles as per the instruction
of his friend. He hands over the same when he meets him at the
equator. Will the friend agree with the weight of the gold
bought? If not why?
A boy of mass 50 kg runs up a staircase of 45 steps in 9 s. If the
height of each step is 15 cm and g= 10 m/s²,
i) How much is the work is done by the boy.
ii) Find his power.
iii) State the type of work done by the gravitational force on the
boy, while he runs up the staircase.
3
4
5
State universal law of gravitation and derive an expression to
calculate force between two objects.
3
I.
Downhill skiing is a classic illustration of the relationship 4
between work and energy. The skier begins at an elevated
position, from top of the hill, thus possessing a large quantity of
potential energy. As the skier begins the descent down the hill,
potential energy is lost and kinetic energy is gained. Once the
skier reaches the bottom of the hill, his height reaches a value of
0 meters. At this point, his speed and kinetic energy have reached
a maximum. This energy state is maintained until the skier meets
a section of unpacked snow and skids to a stop under the force
of friction.
i)
Which form of mechanical energy is totally depleted, once the
skier reaches the bottom of the hill? Why?
ii)
Against which form of the mechanical energy of skier, the
frictional force is doing work to bring to a stop, when he reaches
the bottom of hill?
iii)
How much is the velocity and kinetic energy of the skier at a
position of 32 m above the ground, if the mass of the skier is 50
kg. (g =10 m/s², total height of the hill = 52 m )
OR
II.
State law of conservation of energy and explain conservation of
energy in an oscillating pendulum.
SECTION- B
CHEMISTRY
1
Write the chemical formula of magnesium oxide and name the anion
and cation which constitute the molecule of magnesium oxide.
2
2
Which of the Na+ and He has completely filled K and L shells. Give
reason to support your answer.
2
3
Name the molecule of oxygen with 3 atoms in it and give the valency
of oxygen.
2
4
a)List two postulates of Neil Bohr’s model of an atom
2
b) Draw the atomic structure of:
(i) Sodium atom (atomic no. 11)
(ii) Chlorine atom ( atomic no. 17)
5
a) Define molar mass and calculate the molar mass of Nitric acid
(HNO3).
(Atomic mass of H = 1u , N =14u, O = 16u)
b) Calculate the no. of moles in 270 g of Aluminium.
(Atomic mass of Al = 27u)
c) Calculate the mass of 0.5 moles of Helium gas
(Atomic mass of He = 4u)
3
OR
a) Define Avogadro’s number.
b) Calculate the molar mass of Na2O
(Atomic mass of Na = 23u, O = 16u)
c) Calculate the number of particles in 7g of Nitrogen molecules.
6
Define the term (a) isotope (b) isobar giving one example in each
case.
Name the element whose isotope is used in (i) nuclear reactor , (ii)
treatment of cancer
3
7
a) Define atomic number of an element.
b) One atom of an element contains 8 protons and mass number
16. Find
(i) Number of electrons (ii) atomic number (iii) number of neutrons
4
OR
The given figure depicts the atomic structure of an atom of an element
‘X’. Write the following information about the element ‘X’
a. Atomic number of ‘X’
b. Atomic mass of ‘X’
c. Valency electron of ‘X’
d. Valency of ‘X’
SECTION- C
BIOLOGY
1
Fill in the following table.
Pneumonia
Diabetes
Ascariasis
Cholera
bacteria
Internal factors
c. …………..
Bacteria
2
Acute
a……………..
acute
d. ………….
Infectious
b. …………..
Infectious
Infectious
2
i. Common cold and Japanese Encephalitis are both diseases caused
by viruses. Differentiate them based on their
a) means of spread
b) point of entry into the host body and the target organ
3
OR
ii. Define immunization? Name any two vaccines that forms a part of
‘Public Health Programme of Childhood Immunization’. Mention the
diseases against which these vaccines are used.
3
i)
ii)
iii)
Name a disease that do not show any target specific symptoms.
Name the target organ of this disease.
Describe four ways in which this disease is transmitted from
one person to another.
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