December 2, 2022

# Class 9 Sample paper science 2022 term 2

Class 9 Sample paper science is here for term 2 preparation. Here is both pdf and written versions. Students can give the test and check their preparations.

## Section A – All questions of 2 marks

Q- 1  (a) What are Isobars?

(b) Define – Valency

Q- 2 Find the velocity of a toy car of mass 100g having a kinetic energy of 20 J.

Q- 3 Mention any four phenomena that the universal law of gravitation was able to explain.

Q- 4 A stone is dropped from the top of a 40m high tower. Calculate its speed after 2s. Also find the speed with which the stone strikes the ground.

Q- 5 (i) Name two diseases caused by Protozoa.

(ii) What is the difference between being ‘healthy’ and ‘disease-free’? OR

Q- 5 (i) Name the two diseases caused by Fungi.

(ii) Give two factors necessary for a healthy person.

Q- 6 (i) Calculate an expression for the potential energy.

(ii) When an electric bulb is switched on, what energy transformation takes place.

Q- 7 (i) Sunita buys few grains of gold at the poles as per the instruction of one of her friends. She hands over the same when she meets her at the equator. Will the friend agree with the weight of gold bought? If no, why?

(ii) If the moon attracts the earth, then why does the earth not move towards the moon?

OR

Q- 7 (i) What is the acceleration of free fall?

1. Why does a sheet of paper fall slower than one that is crumbled into a ball?

## Section B – All question are of 3 marks

Q- 8 Calculate the number of particles in each of the following :- Atomic mass of Na = 23 O = 16 C = 12

1. 46 g of Na atom
2. 8 g of O2 molecules
3. 0.1 moles of carbon atom

Q- 9 Elements A,B,C,D and E have atomic numbers 4, 9, 13, 17 and 20 respectively.

1. Write their electronic distribution.
2. Write their number of electron, number of proton and atomic masses if their number of neutrons are respectively (4, 10, 14, 19, 22) for A,B,C,D and E.

Q- 10 Write the symptoms when following organs are targeted by microbes.

1. Lungs (b) Liver (c) Brain

Q- 11 (a) Explain the mole concept with examples.

1. Write the three postulates of Daulton.

Q- 12 (a) Write the conclusion of Rutherford’s experiment. (b)Write the limitations of Rutherford’s experiment.

OR

Q- 12 (a) Write how Neil’s bohr model has overcome Rutherford’s experiment’s limitation.

(b)Draw a sketch of Bohr’s model of an atom with three shells.

Q- 13 Explain giving reasons –

1. Balanced diet is necessary for maintaining health body.
2. Health of an organism depends upon the surrounding environmental conditions.

## Section C – All Questions of 4 marks

Q- 14 Sulfur dioxide is a colorless gas with a pungent odor. It is a liquid when under pressure, and it dissolves in water very easily. Sulfur dioxide in the air comes mainly from activities such as the burning of coal and oil at power plants or from copper smelting. In nature, sulfur dioxide can be released into the air from volcanic eruptions.

‘SO2 is an air pollutant released during the burning of fossil fuels and from automobile exhaust’.

1. Write the names of elements present in this gas.
2. What are the valencies of sulphur in SO2 and SO3? (c)Find out the number of molecules in 5 moles of SO2. (d)Calculate the number of moles in 320 g of SO2 gas.

OR

(d)Calculate the molar mass of 10 moles of sodium sulphite.

[Given, atomic masses of S = 32 u, O = 16 u, Na = 23 u and NA =

6.022 x 1023 per mol]

Q- 15 In physics, work is the energy transferred to or from an object via the application of force along with a displacement. In its simplest form, it is often represented as the product of force and displacement. A force is said to do positive work if (when applied) it has a component in the direction of the displacement of the point of application. A force does negative work if it has a component opposite to the direction of the displacement at the point of application of the force.

(a)State the law of conservation of energy. (b)Define mechanical energy.

(c)Calculate the energy in kWh consumed in 5 hours by four devices of power 600 W each.

Also Check :

Class 9 Science Chapter 10 Gravitation extra questions

Class 9 Science Chapter 11 Work and energy extra questions

Class 9 Science Chapter 13 Why do we fall ill extra questions

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