Students must start practicing the questions from CBSE Sample Papers for Class 9 Science with Solutions Set 3 are designed as per the revised syllabus.
CBSE Sample Papers for Class 9 Science Set 3 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 internal 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 he 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.
Tina found a syringe in her science lab. The mouth of the syringe was closed with a rubber cork. Tina tried to press the piston of the syringe as much as possible.
Tina found it difficult to press the piston as it moved deeper. What could be the reason? [1]
(A) compression ot the substance gets difficult when there is less space between the particles.
(B) Compression of the substance gets difficult when there is more space between the particles.
(C) Expansion of the substance happens which causes difficulty in movement of the piston.
(D) None of these.
Answer:
Option (A) is correct.
Explanation: Particles of substance get closer and become compact and hence movement is restricted. Compression becomes difficult when there is less space between the particles.
Question 2.
When the food is being cooked in the kitchen, name the process which brings smell. [1]
(A) Evaporation
(B) Diffusion
(C) Osmosis
(D) Boiling
Answer:
Option (B) is correct.
Explanation: The vapours that come out from cooking food diffuse into the air and can be smelled even at a distance.
Question 3.
Which of the following is gas in a liquid solution? [1]
(A) A solution of sugar and water.
(B) Alloy
(C) Aerated drinks
(D) Vinegar
Answer:
Option (C) is correct.
Explanation: Aerated drinks like soda water are gas in liquid type of solution, where gas gets dissolved in liquid.
Question 4.
An element ‘X’ has a valency 3. What will be the formula of its oxide? [1]
(A) X2O3
(B) X3O2
(C) XO
(D) X2O2
Answer:
Option (A) is correct.
Explanation: Element X has valency 3 and oxide radical has valency 2. So, the formula of oxide will be X2O3.
Question 5.
Which of the following statements about Rutherfords’ model of atom are correct? [1]
(i) Considered the nucleus as positively charged.
(ii) Established that the a-particles are four times as heavy as a hydrogen atom.
(iii) Can be compared to the solar system.
(iv) Was in agreement with Thomson’s model. ‘
(A) (i) and (iii)
(B) (ii) and (iii)
(C) (i) and (iv)
(D) Only (i)
Answer:
Option (A) is correct.
Explanation: According to Rutherford’s model, a central positively charged nucleus is present in the atom and electrons revolve around it.
Question 6.
Identify colloid from the following mixtures: [1]
(A) Muddy water
(B) Sugar in water
(C) Ink
(D) Soda water
Answer:
Option (C) is correct.
Explanation: Ink is a colloid as the particles do not dissolve completely, but also they do not settle at the bottom.
Question 7.
A student has written following statements about soil. Which of these is correct? [1]
(A) Soil is a homogeneous mixture.
(B) Soil is a heterogeneous mixture.
(C) Soil is a compound.
(D) Soil is a suspension.
Answer:
Option (B) is correct
Explanation: Soil is composed of small pieces of a variety of materials in different states of matter, so ills a heterogeneous mixture.
Question 8.
Cell arises from pre-existing cell was stated by: [1]
(A) Haeckel
(B) Virchow
(C) Hooke
(D) Schleiden
Answer:
Option (B) is correct.
Explanation: Schleiden (1836) and Schwann (1834) gave the cell theory, which was further refined by R. Virchow (1855). Virchow presented the idea that all cells arise from pre-existing cell.
Question 9.
The dead element present in the phloem is:
(A) Companion cells
(B) Phloem fibres
(C) Phloern parenchyma
(D) Sieve tubes.
Answer:
Option (B) is correct.
Explanation: Phloem fibres are thick-walled, elongated spindle-shaped dead cells which possess narrow lumen.
Question 10.
Select the prokaryotic cell.
(A) Amoeba
(B) Bacteria
(C) Paramecium
(D) Hydra
Answer:
Option (B) is correct.
Explanation: A bacterial cell does not have a true nucleus or well-developed nucleus. So, it is a prokaryotic cell.
Question 11.
While doing work and running, you move your organs like hands, legs, etc. Which among the following is correct? [1]
(A) Smooth muscles contract and pull the ligament to move the bones.
(B) Smooth muscles contract and pull the tendons to move the bones.
(C) Skeletal muscles contract and pull the ligament to move the bones.
(D) Skeletal muscles contract and pull the tendon to move the bones.
Answer:
Option (D) is correct.
Explanation: Skeletal muscles are called striped, muscles, due to presence of alternate dark
Question 12.
Living cells were discovered by: [1]
(A) Robert Hooke
(B) Purkinje
(C) Leeuwenhoek
(D) Robert Brown
Answer:
Option (C) is correct.
Explanation: In 1674, Antonie Van Leeuwen Hoek discovered the living cell.
Question 13.
A body is thrown vertically upward with velocity u, and the greatest height to which it will rise is: [1]
(A) \(\frac{u}{g}\)
(B) \(\frac{u^2}{2 g} \)
(C) \(\frac{u^2}{g} \)
(D) \(\frac{u}{2 g} \)
Answer:
Option (B) is correct
Explanation: Given, initial velocity = u, height = h and a = g (acceleration due to gravity). At the highest point, final velocity becomes zero
i.e., v = 0. From, third equation of motion,
ν2 = υ2 – 2gh
0 = u2 – 2gh
2gh = u2
h = \(\frac{u^2}{2 g} \)
Here, we have used negative sign because the body is moving against the gravity.
Question 14.
same the type of motion in which speed remains constant but the velocity of body changes. [1]
(A) Linear motion
(B) Uniform motion
(C) Circular motion
(D) Accelerated motion
Answer:
Option (C) is correct.
Explanation: Speed is a scalar quantity while velocity is a vector quantity. The direction changes at every point in a uniform circular motion. Therefore, in uniform circular motion, the speed remains constant but the velocity keeps changing.
Question 15.
Growing two or more crops simultaneously on the same field in a definite pattern is called: [1]
(A) Intercropping
(B) Mixed cropping
(C) Crop rotation
(D) Organic farming
Answer:
Option (A) is correct.
Explanation: Growing two or more crops simultaneously on the same field in a definite pattern is intercropping. Crop rotation means growing different crops on a piece of land in a pre-planned succession. Mixed cropping is growing two or more crops simultaneously on the same piece of land in a non-specific manner. Organic farming is a farming system with minimal or no use of chemicals and with maximum input of organic manures, recycled farm wastes, etc.
Question 16.
The period of milk production after the birth of a calf is known as: [1]
(A) Gestation Period
(B) Lactation Period
(C) Both (A) and (B)
(D) None of these
Answer:
Option (B) is correct.
Explanation: Lactation period is the period of milk production after the birth of a calf.
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): Carbonates are polyatomic ions.
Reason (R): The carbonate ion consists of one carbon atom and three oxygen atoms and carries an overall charge of 2. [1]
Answer:
Option (A) is correct.
Explanation: The carbonate ion consists of one carbon atom and three oxygen atoms thus it is a polyatomic atomJt carries an overall charge.
Question 18.
Assertion (A): Not all cells of the human body look alike in terms of structure.
Reason (R): Structure of cell is determined by the function it performs. [1]
Answer:
Option (A) is correct.
Explanation: Yes, not all cells in our body look a like in terms of shape, size, and structure. The shape, size, and structure of cells are determined by the function they perform.
Question 19.
Assertion (A): An object thrown vertically upward with certain velocity t’, reaches maximum height, and falls back with same velocity.
Reason (R): Whenever an oblect falls towards the Earth, gravitational force of the Earth causes acceleration. [1]
Answer:
Option (D) is correct.
Explanation: When an object is thrown vertically upward with certain velocity, it will fall back freely. There will be a change in the magnitude of velocity due to gravitational force of the Earth.
Question 20.
Assertion (A): Crop rotation is the practice of growing two or more varieties of crops in the same region in sequential seasons.
Reason (R): Cauliflower and chilli plants grown together in alternating rows are examples of crop rotation. [1]
Answer:
Option (C) is correct.
Explanation: Crop rotation is the practice of growing two or more varieties of crops in the same region in sequential seasons. A common example of crop rotation is to cultivate maize followed by soybean. Growing cauliflower and chili plants together in alternating rows is an example of intercropping. Intercropping allows farmers to grow two or more crops simultaneously in the same field in a definite pattern.
Section – B
(Question No. 21 to 26 are very short answer questions)
Question 21.
An atom of an element has three electi-ons in its 3rd orbit, which is the outermost shell. Write: the electronic configuration, atomic number, number of protons and valency of the element. [2]
Answer:
(a) Electronic configuration -2,8,3
(b) Atomic number = number of electrons = 2 + 8 +3=13
(c) Number of protons = number of electrons = 13
(d) Valency – 3 as the atom will quickly loose the outer 3 electrons.
Question 22.
Write the function of chromatin material. [2]
Answer:
The chromatin material mainly consists of deoxyribonucleic acid (DNA) which stores and transmits the hereditary information from one generation to another.
Question 23.
Why are plants and animals made up of different tissues? [2]
OR
Name the type of tissue present in the lining of the kidney tubules and its function.
Answer:
There are many differences in structure and functions in plants and animals, and hence they are made up of different tissues. For example, plants are autotrophic organisms, so prepare their own food by photosynthesis.
Moreover, plants are stationary or fixed organisms; they do not have to move from place to place in the search of their food. Since they do not consume or need much energy, so most of the plant tissues are supportive, which provides them with structural strength.
Animals on the other hand are heterotrophic organisms. They have to move in search of food, mate, and find shelter, so they need more energy as compared to plants, Most of the tissues they contain are living.
OR
Cuboidal epithelium.
Function-Provides mechanical support.
Question 24.
Sound intensity is the total energy in a sound wave.
Decibel (dB) is the unit of intensity.
The chart shows the permissible time for listening to different sounds.
The sound intensity in front row of a rock concert is 140 dB. Does the sound heard by sitting in the front row of rock concert for 10 minutes follow the permissible exposure time of hearing? Why? [2]
Answer:
No, sitting in the front row of rock concert for 10 minutes does not follow the permissible exposure time of hearing. This is because the permissible sound intensity is 115 dB for less than a minute. In the front row of rock concert, the intensity given is 140 dB.
Question 25.
A rolling ball of mass 3 kg strikes smaller ball of mass 1 kg at rest. After collision, both the halls roll in the direction shown in the picture.
The bigger ball strikes the smaller hail with a momentum. What would the momentum of the ball depend on? After their collision, both the balls continue to roll for some time and then come to a rest. Which external force causes the halls to stop rolling? [2]
OR
Define speed and velocity. Write their SI units. A body is moving with a velocity of 15 m’s. If the motion is uniform, what will be the velocity after 10 s ? [2]
Answer:
Momentum of the ball would depend on mass and velocity of the ball. A frictional force acts as the external force which causes the balls to stop rolling.
OR
Speed is the distance travelled by an object in a given time. Its SI unit is m/s. Velocity is the speed of an object moving in a direction, or the displacement of an object in unit time. SI unit of velocity is same as speed i.e., m/s. As the motion of the body is uniform the velocity remains constant i.e., 15 m/s even after 10 s (acceleration is also zero).
Question 26.
The given figure shows a diagrammatic representation of a method of cropping, where crop A – • crop B –
(a) Identify the method of cropping.
(b) Mention two benefits that a farmer gets by following this cropping pattern. [2]
Answer:
(a) Intercropping
(b)
- It ensures maximum utilisation of nutrients.
- It prevents pests and diseases from spreading to all plants.
Section – C
(Question No. 27 to 33 are short answer questions)
Question 27.
(a) Define atomic mass unit.
(b) Distinguish between molecular mass and molar mass.
(c) Give an example of: (i) diatomic, (ii) triatomic molecule of compounds. [3]
Answer:
(a) It is the mass unit exactly equal to one-twelfth (1/12th)the mass of one atom of carbon- 12.
(b) The molecular mass of a substance is the sum of the atomic masses of all atoms in a molecule whereas the mass of 1 mole of any substance is called its molar mass. Molecular mass is measured by a.m.u. whereas molar mass by g/mol.
(c) Diatomic molecules of a compound: HCl, CO, NO
Triatomic molecules of a compound: CO2, H2O, SO2.
Question 28.
You are provided with a solution of substance ‘X’. How will you test whether it ¡s saturated or unsaturated with respect to X’ at a given temperature? What happens when a hot saturated solution is allowed to cool? [3]
OR
(a) Write down the name of compounds represented by the following formulae:
(i) Ca(OH)2,
(ii) K2SO4
(b) Give two examples of bivalent cations. [3]
Answer:
When no more quantity of ‘X’ substance can be dissolved in a solution at a given temperature, then the solution is saturated with respect to ‘X’. When a hot saturated solution is allowed to cool, crystals of substance separate out from the solution.
OR
(a)
(i) Calcium hydroxide
(ii) Potassium sulphate
(b) Bivalent cation = Mg2+, Ca2+, Zn2+, Fe2+ Cu2+
Question 29.
How are the following related to each other?
(a) Chromatin network and chromosomes
(b) Chloroplast and chlorophyll
(c) Genes and DNA. [3]
Answer:
(a) On cell division, chromatin network condenses into chromosomes.
(b) Chioroplast is a plastid which contains a green pigment called chlorophyll which is responsible for photosynthesis.
(c) The segments of DNA are called genes.
Question 30.
(a) State the differences between tendon and ligament.
(b) Give the function of adipose tissues. [3]
Answer:
(a) Differences between tendon and ligament:
Tendon | Ligament |
(i) They Join bone to muscles, | They Join bone to bone. |
(ii) They have limited flexibility, | They have elasticity. |
(iii) They have more strength. | They have less strength. |
(b) Adipose tissue stores fat and provides insulation.
Question 31.
Ran stops a box from sliding down an inclined plane. What is the nature of net force acting on the object (balanced/unbalanced)? What are the forces acting on the object sliding down? [3]
Answer:
The nature of the force acting on the slide! box is unbalanced force. Gravitational and frictional forces are acting on the box.
Question 32.
(a) A train 100m long is moving with a constant velocity of 60 kmh’. Find the time it takes to cross the 1 km-long bridge.
(b) The slope of the line on a position-time graph reveals information about an object’s velocity. What conclusion can you draw regarding the motion of an object, if the position time graph is a:
(i) horizontal line parallel to time axis.
(ii) straight line originating from origin.
(iii) curve. [3]
Answer:
(a) S = length of the bridge + length of the train = 1km + 100m
= 1km + 0.1 km = 1.1km
s = 1.1 km
t = \(\frac{\text { distance }}{\text { speed }}=\frac{1.1}{60}\) = 0.018 hours
(b)
(i) rest,
(ii) uniform motion,
(iii) non-uniform motion. (CBSE Marking Scheme, 2016)
Question 33.
State reason for the following statements:
(a) Sound waves are mechanical waves.
(b) Sometimes we hear echo of sound.
(c) People in their old age suffering from hearing loss, wear hearing aids to hear properly. [3]
Answer:
(a) Because they need material medium to travel.
(b) Because when distance covered by sound from the point of generation to the reflecting surface and back is at least 34.4 m. (as sound persists for 0.1 s)
(c) Because hearing loss may occur due to accident or Listening of loud sounds / biologically. Hearing aid amplifies the signals and makes it easier to hear.
Section – D
(Question No. 34 fo 36 are long answer questions)
Question 34.
(a) Define valency. What conclusions can he drawn about the reactivity of an atom from its valency?
(b) Why does an atom of Argon have zero valency? Explain using the electronic configuration of Argon. [5]
OR
Distinguish in tabular form the behaviour of true solution, suspension, and colloidal solution.
Answer:
(a) Valency: The combining capacity of an atom is known as its valency. Valency is the number of electrons in the outermost shell of an atom. The number of electrons gained or lost or shared gives us the combining capacity of an atom and this decides whether an atom is reactive or not.
(b) The atomic number of Argon = 18, i.e., it has 18 electrons.
Hence, its electronic configuration will be 2,8,8 Since it has 8 electrons in its valence shell, So, its valency = 8-8 = 0
Question 35.
Make a comparison and write down ways in which plant cells are different from animal cells. [5]
OR
Describe the structure of hone and cartilage.
Answer:
Differences between plant cells and animal cells:
Plant Cells | Animal Cells |
(i) Plant cells are larger in size. | Animal cells are comparatively smaller in size. |
(ii) They contain cell wall made of cellulose, which is present outside the plasma membrane. | Cell wall is absent. |
(iii) They contain plastids, i.e., chioroplast, leucoplast and chromoplast. | Plastids are absent. |
(iv) Centrosome is absent. | Centrosome is present. |
(v) Larger vacuoles are present. | Vacuoles either absent or very small in size. |
(vi) Food is stored in the form of starch. | Food is stored in the form of glycogen. |
(vii) Lysosomes either absent or very few in number. | More number of prominent lysosomes are present. |
OR
Bone: Bone is a solid, hard porous tissue. It is produced by osteocyte cells. It forms the natural skeleton and gives the body its basic structure and also supports the body. Its matrix is impregnated with phosphates and carbonates of calcium and magnesium which provided hardness to it. The matrix also contains ossein protein. The matrix is arranged in concentric rings which are called lamellae.
Bone cells lie between the lamellae in fluid-filled spaces called lacunae. Bone cells are also called osteocytes. The bone is surrounded by a connective tissue called periosteum by which muscles and tendons are attached to the bone. A long bone
has a hollow cavity filled with bone marrow which is richly supplied with blood vessels.
Cartilage: Cartilage has widely spaced cells. It is a solid but semi-rigid connective tissue. The solid matrix is composed of proteins and sugars. The cartilage cells are large and angular and they are called chondrocytes. They occurm clusters of 2 or 3 cells in the small spaces called lacunac scattered in the matrix. A sheath called penchondrium binds the cartilage.
Question 36.
Study the given figure and answer the following questions:
(a) What is the potential energy of the object of mass (m) al point B and C when it is raised from point A to B and B to C?
(b) Calculate the potential energy of the object when raised directly from point A to C.
(c) Calculate whether the same amount of work is done against the gravity in each case. Write your inference.
(d) What is mechanical energy? [5]
OR
(a) When will you say a body is in:
(i) Uniform acceleration.
(ii) Non-uniform acceleration.
(b) A train starts from rest and accelerates uniformly for 305 to acquire a velocity of 108 kmh. It travels with this velocity for 20 min. The driver now applies brakes and the train retards uniformly to stop after 20 s. Find the total distance covered by the train.
Answer:
(a) AB to BC
P E. = nigh, P E. = mgh (same)
The potential energy of the object in both the cases would be same.
(b) A to C
P E. = m × g × 2h = 2 mgh
(c) Work done = F X distance
In first case, (A to B + B to C)
W = mgh + mgh = 2 mgh
In second case, (A to C)
W = mg × 2h = 2 mgh
W(AC) = 2(AB) = 2(BC)
Here, the work done is equal in each case.
(d) Mechanical energy is the sum of kinetic energy and potential energy associated with the body.
OR
(a)
- A body is in uniform acceleration if it travels in a straight path when its velocity increases equally or decreases by equal
time intervals. - A body is in non-uniform acceleration if it travels in a straight path when its velocity increases or decreases by unequal amount in equal time intervals.
(b) When train starts from rest,
u = 0, t = 30s, v = 108km/h
= 108 × \(\frac{5}{18}\) =30 m/s.
a = \(\frac{v-u}{t} \) = 1 m/s2
Distance S1 = ut + \(\frac{1}{2}\) at2
= 0 + \(\frac{1}{2}\) × 1 × 30 × 30
= 450 m.
At uniform velocity of 30 m/s for 20 min = 1200 s,
Distance S2 = 30 × 1200 = 36000 m.
On applying brakes,
t = 20 s, u = 30m/s, y = 0
a = \(\frac{v-u}{t}=\frac{0-30}{20}\) = – 1.5 m/s2
Distance S3 = \( \frac{v^2-u^2}{2 a}=\frac{0-(30)^2}{2 \times-(1.5)}\) = 300 m
Total distance = S1 + S2 + S3
=450 + 36000 + 300
= 36750m.
Section – E
(Question No. 37 to 39 are case-based! data-based questions with 2 f03 short sub-parts. Internal choice is provided in one of these sub-parts.)
Question 37.
Observe the table and answer the questions. [4]
Element | No. of Protons | No. of neutron |
A | 11 | 12 |
B | 17 | 18 |
(a) What will be the atomic number of element A? Why?
(b) What will he the number of electrons present in atom of element B?
(c) What will he the valency of elements A and B? Why? [4]
OR
Identify element A and B. Name the compound formed by them.
Answer:
(a) Atomic number of element A will be 11 as it has 11 protons.
(b) 17, as it has 17 protons, number of electrons will also be the same.
(c) Both elements A and B will have valency 1. Element A will tend to lose one electron to complete its octet. Element B has 7 electrons in its outer shell and it will try to gain 1 electron.
OR
Element A: Sodium, Element B- Chlorine, Compound formed- NaCl (Sodium chloride)
Question 38.
The picture shows three types of tissue found in the human body.
(a) Which type of tissue is tissue 1?
(b) Identify tissue 2.
(c) The inner lining of alveoli (air sacs in lungs) is very thin and delicate.
Which type of tissue forms the inner lining of alveoli? Why? [4]
OR
Identify tissue 3. State the function of the cells of tissue 3 in respiratory tract.
Answer:
- Squamous epithelium
- Cuboidal epithelium
- Tissue 1.
In the lung alveoli, transportation of substances occurs through a selectively permeable surface, so they need a thin and
delicate lining which is made up of squamous epithelium.
OR
Ciliated columnar epithelium. In the respiratory tract, the columnar epithelial tissue also has cilia, which can move, and their movement pushes the mucus forward to clear.
Question 39.
A football and a tennis ball of different masses, fall freely on a marble floor from a height of 5 m.
(a) Will the football and the tennis ball hit the floor with the same momentum? Explain your answer.
(b) What is momentum?
(c) Both halls bounced back after hitting the floor. What caused the balls to bounce back? 4
OR
Will the balls reach a height of 5 m or less than 5 m after bouncing back? Explain your answer.
Answer:
- The balls will not hit the floor with the same momentum as their masses are different.
- Momentum of a body is equal to the product of the mass of the body and the velocity of the body.
- An equal and opposite force was exerted on the balls by the floor. This force caused them to bounce back.
OR
The balls will reach a height of less than 5 m as some energy/velocity/momentum will be lost after the balls hit the floor.