TECHNO INDIA GROUP PUBLIC SCHOOL, MANKUNDU

PA-3 Examination 2024-25

STD: IX
Time: 1hr 20min Subject: SCIENCE F.M.: 40

General Instruction:
(1) There are 19 questions in all. All questions are compulsory.
(2) This question paper has four sections: Section A, Section B, Section C and Section D.
(3) All the sections are compulsory.
(4) Section A contains seven questions, five MCQ and two Assertion Reasoning based of 1 mark
each, Section B contains six questions of two marks each, Section C contains three questions of
three marks each, Section D contains three case study-based question of four marks each.
(5) There is no overall choice. However, an internal choice has been provided in two questions
in Section B, one question in Section C. You have to attempt only one of the choices in such
questions.
(6) Use of calculators is not allowed.

Section-A (1X7=7 marks)

1. The atomicity’s of ozone, sulphur, phosphorus and argon are respectively:
(a) 8,3,4 and 1 (b) 1,3,4 and 8 (c) 4,1,8 and 3 (d) 3,8,4 and 1
2. Which of the following statements are correct about meristematic tissues?
a). Composed of cells that are incapable of cell division
b). Composed of a single type of cell
c). It is composed of cells that are able to perform cell division
d). All the above
3. Find out the correct sentence about manure
(i) Manure contains large quantities of organic matter and small quantities of nutrients.
(ii) It increases the water holding capacity of sandy soil.
(iii) It helps in draining out of excess of water from clayey soil.
(iv) Its excessive use pollutes environment because it is made of animal excretory waste.
a) (i) and (iii) b) (i) and (ii) c) (ii) and (iii) d) (iii) and (iv)
4. If a force of 2 N moves an object a distance of 5 meters, the work done is (consider the force
and displacement are in the same direction):
a) 25 J b) 100 J c) 5 J d) 10 J
5. When a body falls freely towards the earth, then its total energy
a) Decreases b) Increases
c) First increases and then decreases d) Remains constant
Question No. 6 to 7 consist of two statements – Assertion (A) and Reason (R). Answer
these questions selecting the appropriate option given below: a) Both A and R are true,
and R is the correct explanation of A. b) Both A and R are true, and R is not the correct
explanation of A. c) A is true but R is false. d) A is false but R is true.
6. Assertion: An object floats if it displaces an amount of liquid whose weight is greater than
the actual weight of the object.
Reason: During floatation an object experiences no net force in the downward direction.
7. Assertion: Ions are charged particles.
Reason: Ions are formed by loss of electrons.
Section-B (2X6=12 marks)
8. The kinetic energy of an object of mass, m moving with a velocity of 5 m s −1 is 25 J. What
will be its kinetic energy when its velocity is doubled? What will be its kinetic energy when its
velocity is increased three times?
(2)
9. Define 1 joule of work. The potential energy of a freely falling object decreases
progressively. Does this violate the law of conservation of energy? Why?
(0.5+1.5= 2)
10. Differentiate between capture fishery and culture fishery? (2)
OR
What is the importance of waxy covering on the aerial part of a plant? (2)
11. Write the formulae of:
(a) Magnesium hydroxide (d) Calcium oxide (b) Hydrogen sulphide (e) Barium chloride
OR
Calculate the molar mass of the following: (i) H2SO4 (ii) C2H5OH (2)
12. Identify the dispersed phase and dispersing medium in the following colloids. (2)
(a ) Fog (b) Cheese (c) shaving foam
13. Mention the type of loss caused by inappropriate conditions of moisture and temperature
prevailing during storage of grains. (2)
Section-C (3X3=9 marks)
14. Why does an object float or sink when placed on the surface of water? The volume of 50 g
of a substance is 20 cm3. If the density of water is 1 g cm−3, will the substance float or sink?
(1+2)
OR
A solid sphere has a radius of 2 cm and a mass of 0.05 kg. What is the relative density of the
sphere? Identify which among A,B or C denotes the correct position of the sphere and why.
(2+1)
15. Prachi took 50 mL of water in two beakers at room temperature and added sodium chloride
to one beaker while sugar to the other, till no more solute would be dissolved. Then she heated
the contents of the beakers and added more solutes in them. (1 ½ +1 ½ )
(a) Will the amount of salt and sugar that can be dissolved in water at given temperature same?
(b) What will you expect to happen if she cools the contents of the beakers? Justify your
answer.
16. Why should preventive measures and biological control methods be preferred for protecting
crops? (3)

Section-D (4X3=12 marks)

17. Read the given passage carefully and give the answer of any four questions from (i) to (v).
Your Physics teacher was demonstrating an experiment in his class with the setup as shown in
the figure below.
He took an eraser, sharpener, steel spoon, plastic ruler, pencil, compass and rubber band and
asked the students to place them on the surface of the water. Students observed that a few
objects float on the surface of water while a few sink in water. (1+1+1+1)

i). An object floats in a liquid if the buoyant force is:

a. zero b. greater than its weight c. less than its weight d. equal to its weight
ii). An object sinks in a liquid if the buoyant force is:
a. zero b. greater than its weight c. less than its weight d. equal to its weight
iii). The buoyant force on an object immersed in a liquid act:
a. in the vertically upward direction b. in the vertically downward direction
0
c. at an angle of 90 to the direction in which weight of the object acts.
d. at an angle of 450 to the direction in which weight of the object acts.
iv). The magnitude of buoyant force depends on the:
a. density of liquid b. volume of liquid c. weight of the object d. viscosity of liquid
v). Magnitude of buoyant force is given by:
a. Newton’s first law b. Archimedes’ principle c. Newton’s second law d. None of these
18. The knowledge of the valences of various radicals helps us to write the formulae
of chemical compounds. The total positive charge on positive ions (cations) is equal
to the total negative charge on negative ions (anions) in a molecule. Therefore, in
writing the formula of a compound, the positive and negative ions are adjusted in
such a way that the total number of positive charges of positive ions (cations)
becomes equal to the total number of negative charges of negative ions (anions).
There is another simple method for writing the formulae of ionic compounds. In this
method, the valences (or positive or negative charges) of the ions can be ‘crossed
over’ to give subscripts. The purpose of crossing over of charges is to find the
number of ions required to equalize the number of positive and negative charges.
i. Element X has two valences 5 and 3 and Y has valency 2. The elements X and Y
are most likely to be respectively. (1)
(a) copper and Sulphur. (b) Sulphur and iron
(c) phosphorus and fluorine. (d) nitrogen and iron.

ii. The formula of the sulphate of an element X is X 2 (SO 4 ) 3 . The formula of nitride of
element X will be. (1)
(a) X 2 N (b) XN 2 . (c) XN (d) X 2 N 3

iii. The formula of a compound is X 3 Y. The valences of elements X and Y will be

respectively. (1)
(a) 1 and 3. (b) 3 and 1. (c) 2 and 3 . (d) 3 and 2

iv. What is polyatomic ion? Give example. (1)

19. Cattle husbandry is done for two purposes— milk and draught labour for agricultural work
such as tilling, irrigation and carting. Indian cattle belong to two different species, Bosindicus,
cows, and Bosbubalis, buffaloes. Milk-producing females are called milch animals (dairy
animals), while the ones used for farm labour are called draught animals. (1+1+1+1)
(i) Identify the exotic breed of cow
(a) Red Sindhi. (b) Sahiwal. (c) Brown Swiss. (d) All of the above

(ii) Identify the correct statements

Statement 1 – Milk production depends on the duration of the lactation period.
Statement 2 – Exotic or foreign breeds are selected for long lactation periods.
Statement 3 – Local breeds show excellent resistance to diseases.
Statement 4 – Animals used for farm labour are called draught animals.
(a) Both 1 & 2. (b) Only 3. (c) Both 3 & 4 (d) All of the above

(iii) Milk-producing females are termed as

(a) Milch animals (b) Dairy animals. (c) Draught animals. (d) Both a & b

(iv) Enlist any two Indian cattle species.