Students must start practicing the questions from CBSE Sample Papers for Class 9 Science with Solutions Set 1 are designed as per the revised syllabus.
CBSE Sample Papers for Class 9 Science Set 1 with Solutions
Time Allowed :3 Hours
Maximum Marks: 80
General Instructions:
Read the following instructions carefully.
- This question paper consists of 39 questions in 5 sections.
- All questions are compulsory. However, an infernal choice is provided in some questions. A student is expected to attempt only one of these questions.
- Section A consists of 20 objective-type questions carrying 1 mark each.
- Section B consists of 6 Very Short questions carrying 02 marks each. Answers to these questions should be in the range of 30 to 50 words.
- Section C consists of 7 Short Answer type questions carrying 03 marks each. Answers to these questions should be
in the range of 50 to 80 words. - Section D consists of 3 Long Answer type questions carrying 05 marks each, Answer to these questions should be in the range of 80 to 120 words.
- Section E consists of 3 source-based/case-based units of assessment of 04 marks each with sub-parts.
Section – A
(Select and write the most appropriate option out of the four options given for each of the questions 1 – 20. There is no negative mark for incorrect response.)
Question 1.
Masood took 10 mt.. of the coloured water from ¡ar 2 and poured it into 1oo ml of plain water in jar X. He then took 10 ml of the mixture from lar X and poured it into 100 ml of plain water in jar Y.
He mixed the liquids in jars X and Y.
What would be 3 the likely colour of the liquids in jar X and jar Y respectively? [1]
Answer:
Option (B) is correct.
Explanation: Masood first added 10 ml of the coloured water from jar 2 into 100 ml of plain water in jar X. Here it got diluted and the colour became faint. He then took 10 ml of the mixture from jar X and poured it into 100 ml of plain water in jar Y. It means it got even more diluted and colour became even more faint. Such colour concentration can be observed in option B.
Question 2.
Which of the following are physical changes? [1]
(i) Melting of iron metal
(ii) Rusting of iron
(iii) Bending of an iron rod
(iv) Drawing a wire of iron metal
(a) (i), (ii) and (iii)
(b) (i), (ii) and (iv)
(c) (i), (iii) and (iv)
(d) (ii), (iii) and (iv)
Answer:
Option (C) is correct.
Explanation: Rusting of iron is a chemical change. Rest three show physical changes, because in these three processes, iron changes its form, not the chemical composition.
Question 3.
Two substances, A and B were made to react to form a third substance, A2B according to the following reaction 2A + B → A2B. Which of the following statements concerning this reaction are incorrect? [1]
(i) The product A2B shows the properties of substances A and B.
(ii) The product will always have a fixed composition.
(iii) The product so formed cannot be classified as a compound.
(iv) The product so formed is an element.
(a) (i), (ii) and (iii)
(b) (ii), (iii) and (iv)
(c) (i), (iii) and (iv)
(d) (i), (ii) and (iv)
Answer:
Option (C) is correct.
Explanation: A2B is a compound made up of two elements A and B in a fixed ratio. The properties of a compound are entirely different from those of its constituent elements. The composition of a compound is always fixed.
Question 4.
The atomic mass of two elements are given below. [1]
Oxygen = 16u
Sulphur = 32u
What is the ratio by the atomic mass of sulphur and oxygen in SO2?
(A) 1:1
(B) 1:2
(C) 2:1
(D) 1:4
Answer:
Option (A) is correct.
Explanation: In SO2, there is one atom of sulphur with mass 32 units and 2 atoms of oxygen each with mass 16 units. Hence the ratio becomes 1:1.
Question 5.
Which of the following is true for an element? [1]
(i) Atomic number = number of protons + number of electrons.
(ii) Mass number = number of protons + number of neutrons.
(iii) Atomic number = number of protons = number of neutrons.
(iv) Atomic number = number of protons = number of electrons.
(A) (i) and (ii)
(B) (i) and (iii)
(C) (ii) and (iii)
(D) (ii) and (iv)
Answer:
Option (D) is correct.
Explanation: Atomic number = Number of protons = Number of electrons in neutral atom Mass number = Number of protons + Number of neutrons.
Question 6.
Which of the following are pure substances? [1]
(A) Water
(B) Sugar
(C) Mercury
(D) All of these
Answer:
Option (D) is correct.
Explanation: Water, sugar, mercury all are pure substances.
Question 7.
Which of the following correctly represents the electronic distribution in the Mg atom? [1]
(A) 3,8,1
(B) 2,8,2
(C) 1,8,3
(D) 8,2,2
Answer:
Option (B) is correct.
Explanation: Atomic number and the number of electrons in the magnesium atom is 12. So, electronic configuration is 2,8,2 (because 12 = 2 +8+2).
Question 8.
Intestines absorb the digested food materials. What types of epithelial cells are responsible for that? [1]
(A) Stratified squamous cpi thelium
(B) Columnar epithelium
(C) Spindle fibres
(D) Cuboidal epithelium
Answer:
Option (B) is correct.
Explanation: Columnar epithelium forms the lining of stomach, small intestine and colon, forming the mucous membrane. Their main function is absorption (e.g., stomach, intestine) and secretion (e.g., mucous by goblet cells).
Question 9.
Which cell organelle plays a crucial role in detoxifying many poisons and drugs in a cell? [1]
(A) Golgi apparatus
(B) Lysosomes
(C) Smooth endoplasmic reticulum
(D) Vacuoles
Answer:
Option (C) is correct.
Explanation: SER metabolises various toxic or poisonous substances such as drugs, aspirin, insecticides (DDT), petroleum products and pollutants.
Question 10.
Cork cells are made impervious to water and gases by the presence of: [1]
(A) Cellulose
(B) Lipids
(C) Suherin
(D) Lignin
Answer:
Option (C) is correct.
Explanation: The cork cell walls are heavily thickened with an organic substance, suberin. Suberin makes these cells impervious to water and gases.
Question 11.
The muscular tissue which functions throughout the life continuously without fatigue is: [1]
(A) Skeletal muscle
(B) Cardiac muscle
(C) Smooth muscle
(D) Voluntary muscle
Answer:
Option (B) is correct.
Explanation: Cardiac muscles are striated, cylindrical, branched and involuntary in nature. They function throughout life without any fatigue.
Question 12.
A cell will swell up if: [1]
(A) The concentration of water molecules in the cell is higher than the concentration of water molecules in the surrounding medium.
(B) The concentration of water molecules in the surrounding medium is higher than water molecules concentration in the cell.
(C) The concentration of water molecules is same in the cell and in the surrounding medium.
(D) Concentration of water molecules does not matter.
Answer:
Option (B) is correct.
Explanation: When the concentration of water molecules in surrounding medium is higher than water molecules concentration in the cell, the cell will swell up due to endosmosis.
Question 13.
If the displacement of an object is proportional to square of time, then the object moves with: [1]
(A) Uniform velocity
(B) Uniform acceleration
(C) Increasing acceleration
(D) Decreasing acceleration.
Answer:
Option (B) is correct.
Explanation: From second equation of motion,
s = ut + \(\frac{1}{2}\) at2
Then, s = 0 + \(\frac{1}{2}\) at2
s = \(\frac{1}{2}\) at2
s ∝ t2, if a = constant
If the object starts from rest i.e. its initial velocity (u) = 0 and has an acceleration (a) in time (t). So, the object moves with constant or uniform acceleration.
Question 14.
The unit of work is Joule. The other physical quantity that has the same unit is: [1]
(A) Power
(B) Velocity
(C) Energy
(D) Force
Answer:
Option (C) is correct.
Explanation: SI unit of energy is J.
Question 15.
Find Out the correct sentence about manure. [1]
(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 excess water from clayey soil.
(iv) Its excessive use pollutes the 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)
Answer:
Option (B) is correct.
Explanation: Manures are sources of organic matter which supply nutrients in small quantities and organic matter in large quantities. Manure increases the water-holding capacity of sandy soil.
Question 16.
Which of the following are Indian cattle? [1]
(j) Bos indicus
(ii) Bos domestic
(iii) Ros bubbles
(iv) Bos vulgar is
(a) (i) and (iii)
(b) (i) and (ii)
(c) (ii) and (iii)
(d) (iii) and (iv)
Answer:
Option (A) is correct.
Explanation: Bos indicus and Bos bubalis are Indian breeds.
Assertion-Reason Based Questions
Question No. 17 to 20 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.
Question 17.
Assertion (A): A solution can scatter a hean of light passing through it.
Reason (R): The particles of solution are smaller than Iorn in diameter. [1]
Answer:
Option (D) is correct.
Explanation: A solution does not scatter a beam of light passing through it as the size of the particles of solution is smaller than 1 nm in diameter.
Question 18.
Assertion (A): Human RBCs burst in hypotonic solution.
Reason (R): Cells burst due to endosmosis. [1]
Answer:
Option (A) is correct.
Explanation: When human red blood cells are placed in hypotonic solution, they burst due to endosmosis. Endosmosis is the inward movement of water molecules from a hypotonic solution (i.e. the solution that is lower in concentration than the cytoplasm) into the cell.
Question 19.
Assertion (A): Displacement for a course of motion may be zero hut the corresponding distance covered is not zero.
Reason (R): Displacement and distance covered may not always be equal. [1]
Answer:
Option (B) is correct.
Explanation: Distance covered by an object is the total path length while displacement is the shortest distance measured from initial position to the final position of an object. Displacement and distance covered may not always be equal, for example, in a circular path the distance travelled is the perimeter of the circle but displacement is zero as the object comes back to its initial position at the end of the path.
Question 20.
Assertion (A): Legumes increase the soil fertility.
Reason (R): Microbes in the root nodules of leguminous plants fix atmospheric nitrogen. [1]
Answer:
Option (A) is correct.
Explanation: Nitrogen-fixing bacteria e.g., Rhizobium are present in the roots of leguminous plants. They help in enriching the soil with nitrogen increasing soil fertility.
Section – B
(Questions No. 21 to 26 are very short answer questions)
Question 21.
Give the names of the elements present in the following compounds. [2]
(a) Quick lime
(b) Baking powder
Answer:
(a) Calcium and oxygen
(b) Hydrogen and bromine
(c) Sodium, hydrogen, carbon and oxygen
Question 22.
“Water hyacinth plant floats on water surface”. Name the tissue and its type due to which it is possible and also explain the special feature of this tissue that helps in this. [2]
Answer:
A parenchyma is a simple permanent tissue a type of which called aerenchyma is found in floating aquatic plants. Large air cavities are present in aerenchyma that give buoyancy to the plants to help them float.
Question 23.
Growth in plant is restricted to certain regions. Give reason for this fact. Mention two growth regions in plants. [2]
OR
Animals of colder regions and fishes of cold water have thicker layers of subcutaneous fat. Describe why?
Answer:
A The growth of plants occurs only in certain specific regions. This is because the dividing tissues, also known as meristematic tissues, are located only at these points. Growth Regions in plants are root tip, shoot tip, cambium, base of the leaves (either side of node)
OR
Fat acts as an insulator and does not let their body heat to escape. This helps them to survive in extreme cold conditions.
Question 24.
The table below shows the data about a missile. Study the table and answer the question:
Mass of the missile | Speed of the missile | Altitude from which it is dropped |
75 kg | 60 m/s | 850 m |
What will be the kinetic energy and Potential energy when the missile is dropped from the given height altitude? (Assume value of g = 10 m/s2) [2]
Answer:
A Kinetic energy = ½ mv2
= ½ × 75 × (60)2
= ½ × 75 × 3600
= 1800 × 75
= 13500 Joules
Potential energy = mgh
= 75 × 10 × 850
= 637500 Joules
Question 25.
Describe the motion represented by the following displacement-time graphs:
OR
Identical packets are dropped from two aeroplanes. One above the equator and the other above the North Pole, both from the same height Assuming all conditions are identical, will those packets take same time to reach the surface of Earth? Justify ‘our answer. [2]
Answer:
- Uniform motion (positive velocity)
- Non-uniform motion (positive and then negative velocity)
OR
The value of ‘g’ at the equator of the Earth is less than that at the poles. Therefore, the packet falls slowly at the equator in comparison to the poles. Thus, the packet will remain in air for longer time interval, when it is dropped at the equator.
Question 26.
Observe the image and answer the questions: [2]
(a) What is shown in the image?
(b) Why do farmers do beekeeping?
Answer:
(a) It is an image of arrangement of beehive in apiary.
(b) As bee-keeping needs low investments and can be done on the same fields, farmers use it as an additional income-earning activity.
Section – C
(Questions No. 27 to 33 are short answer questions)
Question 27.
(a) How tincture of iodine is prepared?
(b) Define solubility.
(c) What would happen if you were to take a saturated solution at a certain temperature and cool it slowly? [3]
Answer:
(a) Tincture of iodine is made by dissolving iodine in alcohol.
(b) Solubility: The amount of solute present in the saturated solution at a particular temperature is called its solubility.
(c) On decreasing the temperature of a saturated solution, the solubility of the solute decreases.
It starts forming crystals and settles down at the bottom of the container or vessel. This results in the formation of a super-saturated solution.
Question 28.
People of the village use earthen pots to get cool water in summers. Explain the reason that why water remains cool in earthen pots. [3]
OR
Illustrate that the Na atom has completely filled K and L shells.
Answer:
There are pores in an earthen pot through which the liquid inside the pot evaporates.
This evaporation makes the water inside the pot cool because when evaporation occurs water absorbs heat from the surroundings to get converted to its vapour form. As a result, there is an overall decrease in the heat leading
to its cooling.
OR
Electronic configuration of Na is: 2, 8, 1
K shell of Na has 2, L shell has 8 and M shell has one electron.
Question 29.
What is the fundamental unit of life ? Who discovered it? How can they be observed? [3]
Answer:
The fundamental unit of life is cell. It was discovered by Robert Hooke. Cells can be observed under a microscope. Some are big enough, and can be seen with naked eye like egg.
Question 30.
State one point of difference between xylem and phloem. Draw a neat diagram of xylem vessel and a tracheids. [3]
Answer:
(i) Xylem conducts water in the plant body.
Phloem transports food in the plant body.
Question 31.
A body of mass 4kg is dropped from a height of 20m. Calculate the initial momentum and the momentum just before it strips the ground. (g = 10 m/s2) [3]
Answer:
Initial velocity u = O
Initial momentum = 4 × 0 = 0 km/s
Let the velocity just before striking the ground be ‘v’
v2 = u2+ 2gh
ν 2 = 0 + 2 × 10 × 20
ν = 20 m/s
∴ Final Momentum = 4 × 20 = 80 kgm/s
Question 32.
Explain the following type of motion with one example for each:
(a) acceleration is positive
(b) acceleration is negative
(c) acceleration is zero. [3]
Answer:
(a) Here, the motion is accelerated motion, e.g., car moving on a road with increasing velocity.
(b) Here, the motion is retarded motion, e.g., brakes applied to a moving car.
(c) Here, the motion is uniform motion, e.g., car moving with a constant speed along a road.
Question 33.
(a) Define the time period of a wave.
(b) Give the relation among speed of sound p, wavelength X and its frequency y.
(c) A sound wave avels at a speed of 339 ms-1. If its wavelength is 1.5 cm, what is the frequency of the wave? [3]
Answer:
(a) The time taken by two consecutive compressions or rarefactions to cross a fixed point is called the time period of a wave.
(b) Speed of sound (ν) = Wavelength (λ) × Frequency (ν)
ν = λv
(c) Given, velocity, ν = 339 ms-1
Wave Length, λ = 1.5 cm = \(\frac{1.5}{100} \) m
We know, Velocity = Wave length × Frequency
Therefore, Frequency = \(\frac{\text { Velocity }}{\text { Wavelength }}=\frac{339}{\frac{1.5}{100}}\)
= \(\frac{339 \times 100}{1.5}\)
Frequency = 22600 Hz
Section – D
(Question No. 34 f036 are long answer questions)
Question 34.
(a) What do the following symbols/formulae stand for:
(i) 2O
(ii) O2
(iii) O3
(iv) H2O
(b) Give the chemical formula of the following compounds:
(i) Potassium carbonate
(ii) Calcium chloride
(c) Calculate the formula unit mass of Al2(SO4)3
(Given : Atomic mass of Al = 27 u, S = 32 u, O = 16 u)
OR
(a) Distinguish between solids and gases on the basis of following parameters:
(i) Intermolecular distance
(ii) Intermolecular forces of attraction,
(iii) Compressibility. ‘
(b) Give two factors that determine the rate of diffusion of a liquid in another liquid. [5]
Answer:
(i)
(a) Two atoms of oxygen: 2O
(b) Diatomic oxygen: O2 molecule
(c) Tria atomic oxygen: O3 molecule or ozone molecule
(d) Two atoms of hydrogen and one atom of oxygen forming one molecule of water (H2O).
(ii)
(a) K2CO3: Potassium carbonate
(b) CaCl2: Calcium chloride
(iii) Al2(SO4)3
Al = 27 × 2 = 54 u
S = 32 × 3 = 96 u
O = 16 × 12 = 192 u
Formula unit mass = 54 + 96 + 192 = 342 u.
OR
(a) Differences between solids and gases:
Solids | Gases |
(i) Intermolecular space is small so the distance is less. | Intermolecular space is maximum so the distance is more. |
(ii) Intermolecular force of attraction is maximum. | Intermolecular force of attraction is minimum. |
(iii) Solids are rigid and incompressible, | Gases are non-rigid and are compressible. |
(b) The two factors that determine the rate of diffusion of a liquid in another liquid are:
- Temperature
- Pressure
Question 35.
Which parts of a cell are concerned with the following functions?
(a) (i) Release of energy,
(ii) Protein synthesis,
(iii) Transmission of hereditary characters from parents to their offspring.
(b) Mention any two structures, found only in plant cell not in animal cell. [5]
OR
What are the differences between striated, unstriated and cardiac muscles?
Answer:
(a)
- Mitochondria,
- Ribosome,
- Nucleus
(b)
- Cell wall and
- Plastids
OR
Differences between striated, unstriated and cardiac muscles:
Striated muscles | Unstriated (Smooth) muscles | Cardiac muscles |
(i) They are found in limbs, tongue, pharynx etc. | They are present in the walls of visceral organs. | They are present in the heart. |
(ii) Long, cylindrical with blunt ends | Short, spindle-shaped with pointed ends | Short, branched and cylindrical with flat ends |
(iii) Multinucleate nuclei peripheral, | Uninucleate, nucleus in the centre | One or two nuclei in the centre |
(iv) They are voluntary in action. | They are involuntary in action. | They are involuntary in action. |
(v) Dark and light bands are present. | No bands present. | Bands present. |
Question 36.
Study the velocity-time graph and calculate:
(a) me acceleration from A to B.
(b) The acceleration from B to C.
(c) The distance covered in the region ABE.
(d) The average velocity from C to D.
(e) The distance covered in the region BCFE.
OR
(a) A person weighs 110.84 N on Moon, whose acceleration due to gravity is \(\frac{1}{6} \) of that of the Earth. If the value of ‘g’ on Earth is 9.8 ms-2Calculate.
- ‘g’ on Moon.
- Mass of person on Moon
- Weight of person on Earth
(b) How does the value of g on the Earth is related to the mass of the Earth and its radius? Derive it.
Answer:
- a = \(\frac{(25-0)}{(3-0)}\)= 8.3 m/s2
- a = \(\frac{(20-25)}{4-3}\) = – 5m/s2
- Distance = Area of triangle ABE = \(\frac{1}{2} \times 3 \times 25 \) = 37.5 m
(d) v = \(\frac{(20+0)}{2} \) = 10 m/s
(e) Distance = Area of trapezium BCFE
= \(\frac{1}{2} \) (25+20) × (4-3) = 22.5
Or
(a)
- gmoon = gEarth × \(\frac{1}{6} \) = 9.8 × \(\frac{1}{6} \) = 1.63 ms-2
- Mass on Moon will be constant and does not change from place to place. Hence, mass of the person on Moon will be 68 kg.
- wmoon = 110.84 N
m = \(\frac{\mathrm{w}_{\text {moon }}}{\mathrm{g}_{\text {moon }}}=\frac{110.84}{1.63} \) = 68kg
wearth = m × gEarth
wearth = 68 × 9.8 = 666.4 N
(b) According to Newton’s law of gravitation, the force of attraction between Earth and a body is given by
F = \(\frac{G m M}{r^2}\) …………………….. (i)
Force produces an acceleration ‘g’. So, from
Newton’s second law F = mg ……………………. (ii)
From equation (I) and (ii) we get
mg = \(\frac{G m M}{r^2}\)
Section – E
(Question No. 37 to 39 are case-based data-based questions with 2 to 3 short sub-parts. internal choice is provided in one of these sub-parts.)
Question 37.
The formula and charge on ions of three different compounds are shown below:
Formula | PbO2 | MgCl2 | Al2O3 |
Charge on ions | Pb4+ and O2- | Mg2+ and Cl– | Al3+ and O2- |
(a) Name any two cations from the above table.
(b) Name any two anions from the above table.
(c) What is the name of the compound with formula PbO2?
What is the name of compound with formula Al2O3?
What is similarity between them?
OR
What is the valencv of Magnesium and chlorine in MgCl2? [4]
Answer:
(a) Pb4+, Mg2+, Al3+
(b) O2–, Cl–
(c) Lead oxide.
(d) Aluminium oxide.
(e) Both of them are oxides.
OR
Valency of Magnesium = 2 and Chlorine = 1.
Question 38.
Observe the following diagram and answer the questions:
(a) Identify the type of cell.
(b) What is the outermost covering of this cell made of?
(c) Which organelle of this cell is called ‘powerhouse of the cell’? Why? [4]
OR
Which organelle of this cell is called ‘kitchen of the cell’? Why?
Answer:
(a) The diagram shows plant cell.
(b) Cellulose
(c) Mitochondria is called the ‘ powerhouse’ of the cell as it generates energy for the cell.
OR
The chloroplast is called the kitchen of the cell as it carries out photosynthesis to prepare food.
Question 39.
Study the following diagram and answer the following questions given below:
In the figure below the card is flicked with a push. It Was observed that the card moves ahead while coin falls in glass.
(a) Give reason for the above observation.
(b) Which law of motion explains this observation?
(c) If the above coin is replaced by a heavy five-rupee coin, what will be your observation. Give reason. [4]
OR
What is inertia?
Answer:
(a) The coin possesses inertia of rest, it resists the change and hence falls in the glass.
(b) Newton’s first law of motion.
(c) Heavy coin will possess more inertia so it will fall in tumbler faster.
OR
The inability of the body to change its state of rest or uniform motion by itself is called inertia.