CBSE Sample Papers for Class 9 Science Paper 3 are part of CBSE Sample Papers for Class 9 Science. Here we have given CBSE Sample Papers for Class 9 Science Paper 3.
CBSE Sample Papers for Class 9 Science Paper 3
Board | CBSE |
Class | IX |
Subject | Science |
Sample Paper Set | Paper 3 |
Category | CBSE Sample Papers |
Students who are going to appear for CBSE Class 9 Examinations are advised to practice the CBSE sample papers given here which is designed as per the latest Syllabus and marking scheme as prescribed by the CBSE is given here. Paper 3 of Solved CBSE Sample Paper for Class 9 Science is given below with free PDF download solutions.
Time Allowed : 3 Hours
Max. Marks: 80
General Instructions
- The question paper comprises of two Sections, A and B. You are to attempt both the sections.
- All questions are compulsory. However an internal choice will be provided in two questions of 3 marks each and one question of five marks.
- All questions of Section A and all questions of Section B are to be attempted separately.
- Question numbers 1 to 2 in Section A are one-mark questions. These are to be answered in one word or in one sentence.
- Question numbers 3 to 5 in Section A are two-marks questions. These are to be answered in about 30 words each.
- Question numbers 6 to 15 in Section A are three-marks questions. These are to be answered in about 50 words each.
- Question numbers 16 to 21 in Section A are five-marks questions. These are to be answered in about 70 words each.
- Question numbers 22 to 27 in Section B are two-marks questions based on practical skills. These are to be answered in brief
Questions
SECTION-A
Question 1.
Name any four connective tissues.
Question 2.
A gas jar containing air is inverted into another jar containing NO2 gas which is brown in colour. After sometime, brown colour is seen in both the jars. Name the phenomena involved for the appearance of brown colour.
Question 3.
State four reasons to support that water is a compound.
Question 4.
Same number of dried raisins are added to two beakers, one contains water and the other contain saturated sugar solution. In which container will the raisins increase in size and why?
Question 5.
Give the differences between angiosperms and gymnosperms.
Question 6.
What happens to the magnitude of the force of gravitation between two objects if
- Distance between the objects is tripled?
- Mass of both the objects is doubled?
- Mass of both the objects as well as the distance between them is doubled?
OR
A stone dropped from a window reaches the ground in 0.5 seconds.
(i) Calculate its speed just before it hits the ground.
(ii) What is its average speed during 0.5 s?
(iii) Calculate the height of window from the ground.
Question 7.
Give one example of an Indian and a foreign poultry breed, which when crossed produce an improved variety. List any two desirable traits expected from such cross breeding.
Question 8.
Account for the following:
- The temperature of water remains constant during boiling.
- Evaporation is a surface phenomenon.
- The spaces between the constituent particles are maximum in gases.
Question 9.
- Name the living component common to both the complex permanent tissues found in plants. What is its function.
- Give any two ways in which these tissues differ functionally from each other.
Question 10.
- An element ‘A’ has mass number 24 and contain 12 neutrons. What is the valency of ‘ A’?
- The atomic number of uranium is 92. How many electrons are there in a neutral atom?
How many electrons and protons are there in U+2 ion?
Question 11.
Why are bryophytes called ‘amphibians of the plant world?
Question 12.
How many grams of potassium will have the dame number of atoms as 6 grams of sodium? (Atomic mass of Na = 23; K = 39)
OR
The relative atomic mass of boron is 10.8. Calculate the percentage of its isotopes \(_{ 5 }^{ 10 }{ B }\) and \(_{ 5 }^{ 11 }{ B }\) occurring in nature.
Question 13.
What do you mean by ozone depletion?
Question 14.
What is antibiotic penicillin. Give its function.
Question 15.
State one difference between dugwells and tubewells. Explain any two fresh initiatives taken to increase the water available for agriculture.
Question 16.
With the help of a labeled diagram, describe an activity to separate a mixture containing ammonium chloride, sodium chloride and sand.
Question 17.
Give an activity to understand the implications of Rutherford’s α-particle scattering experiment by a gold foil.
Question 18.
Explain how human ear works.
Question 19.
Give the outline classification of animal kingdom.
OR
Give 6 points of difference between Monocot and Dicot plants.
Question 20.
Define momentum of a body. Prove with the help of IIIrd law of motion that the total momentum of two bodies is conserved during collision provided no external force acts. Car ‘A’ of mass 1500 kg, travelling at 25 m/s collides with another car ‘B’ of mass 1000 kg travelling at 15 m/s in the same direction . After collision, the velocity of car A becomes 20 m/s. Calculate the velocity of car B after collision.
Question 21.
Explain nitrogen-cycle in nature and define all the terms involved in it.
SECTION-B
Question 22.
Label the diagram of cockroach correctly.
Question 23.
Filtrate of a food product is taken in four test tubes marked A, B, C and D. Few drops of the following is added to the test tubes to test the presence of starch.
- Sulphuric acid to test tube A
- Iodine solution to test tube B
- Chlorine solution to test tube C
- Sodium hydroxide to test tube D
In which test tube will the blue-black colour appears and why?
Question 24.
For preparing a true solution, the given set up was there. What is ‘a’, ‘b’ and ‘c’?
Question 25.
Name different parts of neuron.
Question 26.
Give two functions of osmosis.
Question 27.
What happens to the speed of sound if the medium is changed?
Answers
SECTION-A
Answer 1.
Blood, bone, cartilage and lymph
Answer 2.
Diffusion
Answer 3.
- Its components cannot be separated by any physical method.
- The properties of constituents are different than the product, oxygen and hydrogen are gases whereas water is liquid.
- The constituents always combine in fixed ratio; (H : O is 2 : 1) by number of atoms and (1 : 8) by mass.
- The melting point of water is fixed.
Answer 4.
The raisins will increase in size in the beaker containing water. As osmosis takes place, the water from higher concentration flows into the raisins where water is at lower concentration.
Answer 5.
Gymnosperms | Angiosperms |
(i) Gymnosperms are seed-bearing, nonflowering plants. | Angiosperms are flowering plants. |
(ii) They are more primitive than angiosperms. | They are the most recent and highly evolved group of plants. |
(iii) Seeds produced are naked, i.e. they are not enclosed inside the fruit. | Seeds are enclosed inside the fruit. |
(iv) Female gametophyte are developed in female cones. | Female gametophyte is found in ovaries of flower. |
Answer 6.
F = \(\frac { G{ m }_{ 1 }{ m }_{ 2 } }{ { d }^{ 2 } } \)
- The force of gravitation becomes \(\frac { 1 }{ 9 } \) th of the earlier value.
- The force of gravitation becomes 4 times of its earlier value.
- The force of gravitation remains unchanged.
OR
Answer 7.
- Aseel, Leghorn
-
- More number and better quality of chicks.
- Dwarf broiler parent for the commercial chick production.
- Better summer adaptation capacity/tolerance to high temperature.
- Low maintenance requirements.
- Reduction in the size of the egg laying bird with the ability to utilise more fibrous, cheaper diet formulated using agricultural by-products. (Any two)
Answer 8.
- Heat energy is used up in changing the state of matter, i.e. from liquid water to water vapour.
- The particles on the surface gains energy from the surroundings which increases their kinetic energy and they change into vapour state.
- The attractive forces between the constituent particles is weakest in gases.
Answer 9.
- Parenchyma
Stores food/conduction of water - Xylem – transports water and minerals/the direction of flow is vertically upwards.
Phloem – transports food from leaves to other parts/flow of the materials is in both direction.
Answer 10.
1. Number of protons = 24 – 12 = 12
Number of electrons =12
KLM
Electronic configuration = 2, 8, 2
Number of valence electrons = 2
∴ Valency = 2
2. In a neutral atom, number of protons = Number of electrons
In Uranium (Z = 92), we have
Atomic number (Z) = Number of electrons = Number of protons = 92
In U2 + ion, there are 90 electrons, as it is cation formed by loss of 2 electrons.
Answer 11.
Bryophytes are fundamentally terrestrial plants but they require water for dehiscence of antheridia, liberation and swimming of antherozoids, fertilisation of egg, opening of archegonial neck and entry of sperms into the archegonium. Because of such peculiar habits they have been most appropriately called the amphibians of the plant kingdom.
Answer 12.
Answer 13.
Ozone layer protects the organisms of the earth from harmful ultraviolet radiations. Chloro- fluoro carbon’s or CFCs are released in the atmosphere due to various activities of man which persist in the atmosphere. On reaching the ozone layer they react with ozone molecules which results in reduction of ozone layer, called depletion of ozone layer/ozone depletion.
A hole in ozone layer over Antarctica indicates the depletion of ozone layer.
Answer 14.
Penicillin is an antibiotic that blocks the bacterial processes which builds the cell-wall. Due to this drug, the bacteria is unable to make a protective cell-wall and dies easily.
It is used to cure the diseases and infections caused by bacteria.
Answer 15.
- Dugwell – water is collected from water bearing strata through buckets or any other water holding device.
Tubewell – water is trapped from the deeper strata using handles present on it. - Rainwater harvesting and watershed management which involves building check dams that stops the rain water from flowing away are the two fresh initiatives taken to increase the water available for agriculture.
Answer 16.
Description: Crush the given mixture and put it in china dish.
Put an inverted funnel over the china dish. Put a cotton plug on the stem of the funnel. Now heat slowly. Ammonium chloride will be collected on the cooler parts of the funnel. Now add water to the remaining mixture and stir it well. Filter it. Sand will be collected as a residue on the filter paper. Evaporate the filtrate to dryness. Common salt will be collected.
Answer 17.
To understand the implications of Rutherford’s α-particle scattering experiment, let us do an activity.
Activity: Let a child stand in front of a wall with his eyes closed. Let him throw stones at the wall from a distance. He will hear sound for each strike of stone on the wall. This is like a nucleus of the atom. But if a blind-folded child has to throw stones at a barbed-wire fence, most of the stones would not hit the fencing and no sound would be heard.
This is because there are lots of gap in the fence which allows the stone to pass through them. This is like empty space in an atom through which a-particles will pass through. Based on the above activity and similiar reasoning, we can write the following conclusions derived from Rutherford a-particle scattering experiment as:
- Most of the space inside the atom is empty, as a-particles passed through the foil.
- Very few particles deflected from their path, this show that positive charge occupies very less space.
- A very small fraction of a-particles are deflected by 180°, this shows that all the positive charge and mass of the gold atom is concentrated in a very small volume within the atom.
Answer 18.
The outer ear is called ‘pinna’. It collects the sound from the surroundings. The collected sound passes through the auditory canal.
At the end of the auditory canal there is a thin membrane called eardrum or tymphanic membrane. When from compression of the medium reaches the eardrum the pressure on . the outside of the membrane increases and forces the eardrum inwards. Similarly, the eardrum moves outward when a rarefaction reaches it. In this way the eardrum vibrates. The vibrations are amplified several times by the three bones (hammer, anvil and stirrup) in the middle ear.
The middle ear transmits these amplified pressure variations received from the sound wave to the inner ear. In the inner ear, the pressure variations are turned into electrical signals by the cochlea. These electrical signals are sent to the brain via auditory nerve and then brain interprets them as sound.
Answer 19.
OR
Monocot Plants | Dicot Plants |
(i) Fibrous root. | Tap root. |
(ii) Parallel venation. | Reticulate venation. |
(iii) Seeds with one cotyledon. | Seeds with two cotyledons. |
(iv) Vascular bundles are scattered. | Vascular bundles are arranged in rings. |
(v) Flowers are trimerous. | Flowers are pentamerous, flowers or tetramerous. |
(vi) Secondary growth is absent. | Secondary growth is often present. |
Answer 20.
(i) Momentum of a body is the product of mass of the body and its velocity.
(ii) Consider two bodies A and B of masses mA and mB with initial velocities uA and uB respectively colliding with each other such that collision lasts for t seconds.
Ball A exerts a force FAB on ball B and the ball B exerts a force FBA on ball A.
Answer 21.
Terms involved in nitrogen-cycle are
- Nitrogen fixation: Plants cannot use free nitrogen present in the air. The nitrogen molecules are first converted into nitrates and nitrites which can then be taken up and used to make the required molecules. This is called nitrogen fixation which can be done by the bacteria that live in the root nodules of leguminous plants.
- Nitrification: By physical process, i.e. during lightning, high temperature and pressure created in the air converts nitrogen gas the into oxides of nitrogen which dissolves in water and came down along with rain. This is also called nitrification.
- Ammonification: The nitrogen compounds formed are taken by the plants to form proteins which are further converted into ammonia. This process is called ammonification.
- Denitrification: The nitrates and nitrites of nitrogen are acted upon by a group of microbes, e.g. Pseudomonas bacteria, which convert these compounds into free nitrogen gas. This process is called denitrification.
Nitrogen cycle:
- Free nitrogen gas from the atmosphere is converted into nitrates by bacteria or by lightning.
- Nitrates mixes with the soil, is absorbed by the plants to make proteins.
- The proteins in plants and animals are converted into amino acids and ammonia.
- Ammonia is converted into nitrates and then these nitrates and nitrites present in the soil is acted upon by a group of bacteria called denitrifying bacteria.
This process is called denitrification, in which nitrates are converted into free nitrogen and is released back to the atmosphere.
SECTION-B
Answer 22.
- A – Segment,
- B – Joint appendage
- C – Anal cerci
Answer 23.
In test tube B the blue-black colour will appear, because iodine shows this colour change with starch.
Answer 24.
- A – Glass rod,
- B – Beaker and
- C – Solution
Answer 25.
- Cell body or cyton
- Dendrite
- Axon
Answer 26.
- Plant root cells absorbs water by osmosis.
- Unicellular organisms like amoeba takes in the required materials by osmosis.
Answer 27.
Speed of sound depends on the media in which it is travelling. Speed of sound is highest in solids, and lower in liquids and least in gases. So, if the medium is changed, the speed of sound will change.
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