CBSE Sample Papers for Class 9 Science Paper 6 are part of CBSE Sample Papers for Class 9 Science. Here we have given CBSE Sample Papers for Class 9 Science Paper 6.
CBSE Sample Papers for Class 9 Science Paper 6
Board | CBSE |
Class | IX |
Subject | Science |
Sample Paper Set | Paper 6 |
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 6 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.
What are canal rays?
Question 2.
What happen to the rate of diffusion if the temperature is increased?
Question 3.
What is the difference between fog and smoke?
Question 4.
Give the differences between monocots and dicots.
Question 5.
What is the ratio by mass of combining elements in H2O and NH3?
Question 6.
Compare all the proposed models of an atom.
Question 7.
Why are roads on mountains inclined inwards at turns?
Question 8.
Give the characteristics of Arthropoda with 2 examples.
Question 9.
How are winds caused and what decides the breeze to be gentle, strong wind or a terrible storm?
Question 10.
A sound produces 13 crests and 15 troughs in 3 seconds. When the second crest is produced the first is 2 cm away from the source.
Calculate:
(a) the wavelength
(b) the frequency
(c) the wave speed.
Question 11.
- List any 3 situations from your daily life where you can say that work has been done.
- What work is said to be done to increase the velocity of a car from 15 km/h to 30 km/h, if mass of the car is 1000 kg?
OR
What are fluids? Why is Archimedes’ principle applicable only for fluids? Give the application . of Archimedes’principle.
Question 12.
Akshay’s friend visited his house in Mumbai and he was surprised to see air conditioners installed in all of his rooms. His friend advised Akshay to use watercoolers and save electricity. On this Akshay told him that the water-cooler is not at all effective in coastal areas.
- Why are water-coolers not effective in coastal areas?
- What are the other two factors on which evaporation of water depends?
- What value of Akshay’s friend is seen in this act?
Question 13.
- State two conditions required for osmosis.
- What is plasmolysis?
OR
- What is the function of nucleus in a cell?
- When we put raisins in water, why do they swell?
Question 14.
A train is travelling at a speed of 90 km h-1. Brakes are applied so as to produce a uniform acceleration of-0.5 ms-2. Find how far the train will go before it is brought to rest.
Question 15.
AIDS is spreading globally at a very fast rate, a group of Class-IX students prepared a module on its prevention and posted it on social networking site.
- What is the cause of AIDS?
- Give any two preventions for it.
- What values of students are reflected in this act?
Question 16.
(a) Explain law of conservation of energy.
(b) Two boys A and B were given a task to carry 20 kg load from ground level to height 10 m.
A completed the work in 40 s and B in 60 s. Calculate the power in both the cases. Who has greater power?
Question 17.
What are the different ways used for the treatment and prevention of diseases? Name all the micro-organisms that causes infectious diseases and name few diseases caused by each micro-organism.
Question 18.
Diagrammatically explain the differences between three types of muscle fibres.
Question 19.
What are the basis for classification of organisms? Give the characteristics of flatworms, roundworms and segmented worms. Give their phylum.
Question 20.
- How will you find the valency of chlorine, sulphur and magnesium?
- If the number of electrons in an atom is 8 and number of protons is also 8, then
- What is the atomic number of the atom?
- What is the charge on the atom?
Question 21.
- Draw a neat labelled diagram of plant cell and label its parts
- What is membrane biogenesis?
OR
What do you mean by connective tissue? Explain its types.
SECTION-B
Question 22.
While performing an experiment to determine the percentage of water absorbed by raisins, the following data was obtained:
Mass of water taken in the beaker = 50 g
Mass of dry raisins = 5 g
Mass of soaked raisins in water = 8 g
Calculate the percentage of water absorbed by the raisins.
Question 23.
A thermometer has 20 equal divisions between 90°C and 100°C mark. A student while determining the boiling point of water finds that the mercury level becomes stationary at the 19th mark above 90°C. What should be the boiling point of water?
Question 24.
24 g of magnesium bums in air to form magnesium oxide as shown below:
2Mg + O2 → 2MgO
How much magnesium oxide is formed in the product?
Question 25.
Why is it suggested to wear dark coloured goggles while watching the burning of magnesium ribbon in air?
Question 26.
What happens when dilute sulphuric acid is added to a compound of iron and sulphur?
Question 27.
Name the constituents of the following compounds:
Water, Sugar, Magnesium oxide, Iron sulphide
Answers
SECTION-A
Answer 1.
Canal rays are positively charged radiations which led to the discovery of positively charged sub-atomic particle called protons.
Answer 2.
With increase in temperature, the rate of diffusion also increases as the particles gain energy and vibrate more.
Answer 3.
Fog is a colloidal solution with liquid phase dispersed in gas medium.
Smoke is a colloidal solution with solid phase dispersed in gas medium.
Answer 4.
Monocot Plants | Dicot Plants |
(i) Seeds with one cotyledon. | Seeds with two cotyledons. |
(ii) Leaves have parallel venation. | Leaves have reticulate venation. |
(iii) Root system-fibrous. | Root system-tap root. |
(iv) Vascular bundles are scattered. | Vascular bundles are arranged in the form of rings. |
Answer 5.
H2O : ratio by mass of combining elements 2 : 16 → 1 : 8 (H : O)
NH3 : ratio by mass of combining elements 14 : 3 → 14 : 3 (N : H)
Answer 6.
Answer 7.
A vehicle moving on a mountaineous road near is in the inertia of motion. At a sudden turns there is a tendency of vehicle to fall off the road due to sudden change in the line of motion, hence the roads are inclined inwards so that the vehicle does not fall down the mountain.
Answer 8.
- Arthropoda means ‘jointed legs’.
- Animals are bilaterally symmetrical and segmented.
- It has an open circulatory system.
- This is the largest group of animals.
Example: Spider, scorpions, crabs, houseflies. (Any two)
Answer 9.
Wind is caused due to the differences in atmospheric pressure. When there is a difference in atmospheric pressure, heated air rises creating a low pressure area. This low pressure area is filled by air from cooler areas. This cycle creates a flow of air thus, causing wind.
The other factors that influence the wind flow is the rotation of Earth and the presence of mountain ranges in the path of wind. All these factors decide whether the wind is gentle, strong or a terrible storm.
Answer 10.
Answer 11.
1. Three situations where work is done are:
- If a pebble lying on a surface is pushed, the pebble moves through a distance. In this situation work is said to be done.
- If a girl pulls a trolley and the trolley moves through a distance. In this situation work is done.
- If a book is lifted to a height, the force is applied and the book rises up, work is said to be done.
2. u =15 km/h, v = 30 km/h, Mass = 1000 kg
W= ?
OR
Fluids are the substances which can flow, e.g. gases and liquids are fluids. Archimedes’ principle is based on the upward forces exerted by fluids on any object immersed in it. Hence it is applicable only for fluids.
Applications of Archimedes’ principle:
- It is used in designing of ship and submarine.
- It is used in designing lactometer which is used to determine the purity of milk.
- To make hydrometer that is used to determine the density of liquid.
Answer 12.
- Water coolers are not effective in coastal areas because of high humidity.
- The other two factors on which evaporation of water depends are temperature and surface area of the liquid.
- Akshay’s friend showed the value of a concerned citizen, morally responsible and trustworthy in nature.
Answer 13.
-
- The difference in the concentration of water, i.e. one region should have higher concentration than the other region.
- Semi-permeable membrane is also required through which water can flow.
- When a living plant cell loses water through osmosis there is shrinkage or contraction of the contents of the cell away from the cell wall. This phenomenon is known as plasmolysis.
OR
- Nucleus plays a very important role in the reproduction of cells. It helps the single cell to divide and form two new daughter cells.
It plays an important role in determining how the cell will develop and what form it will exhibit at maturity, by directing the chemical activities of the cell. - Raisins are dry with less water inside, when they are kept in water osmosis takes place and water will flow through the cell wall to the cell membrane of the raisins and therefore it swells.
Answer 14.
Answer 15.
- HIV virus
- Two preventive measures against AIDS are use of disposable injections, scanning of blood for HIV before transfusion.
- Students showed the values of moral responsibility and general awareness.
Answer 16.
(a) Law of conservation of energy states that energy can neither be created nor destroyed but it can be transferred from one form to another. The total energy before and after transformation remains the same.
Let the body be at position A above the ground level. It has potential energy PE. When the body falls down and reaches in the middle, P.E. = K.E. and when the body is just about to touch the ground its K.E. > P.E. As it touches the ground its potential energy is completely transferred into kinetic energy. This shows that P.E. is getting transferred into kinetic energy.
Answer 17.
Principles of treatment for diseases are:
- To reduce the effect of diseases.
- To kill the cause of disease, i.e. to kill the microbes like bacteria, fungi, protozoa.
Principles of prevention are:
(a) General ways: It is related to prevent the exposure to disease causing microbes. This can be done by following ways.
- For avoiding air-borne infections – Avoid visiting public places, cover your nose and mouth while sneezing or coughing.
- For water-borne infections – Drink safe, clean and boiled water.
- For vector-borne diseases – Keep the surroundings clean, keep food and water covered and clean. Do not allow any water to stand as it becomes a breeding ground for mosquitoes.
- Self immunity – It is self-defence mechanism in our system that can fight off and kill microbes that enter our body.
(b) Specific ways: By giving vaccines, childhood immunisation that is given to children for preventing infections and diseases
Infectious Micro-organism | Diseases |
(i) Bacteria | Tuberculosis, typhoid, diarrhoea, cholera |
(ii) Virus | Polio, AIDS, chickenpox |
(iii) Protozoa | Malaria, amoebiasis, kala-azar, sleeping sickness |
(iv) Fungi | Food poisoning, skin diseases |
Answer 18.
Striated muscles:
- They are voluntary muscles connected to the bones (Skeletal muscles).
- The cells are long, cylindrical with many nucleus and are unbranched.
Smooth muscles:
- They are involuntary muscles found in the alimentary canal and lungs.
- They are spindle shaped and have cells with single nucleus.
Cardiac muscles:
- They are involuntary muscles found in heart.
- They are branched and have cells with only one nucleus.
Answer 19.
- The basis for classification are:
- Presence or absence of nucleus.
- Whether oganisms are unicellular or multicellular.
- Level of organisation.
- Mode of nutrition: autotrophic or heterotrophic mode of nutrition.
- Organisms that perform photosynthesis (Plants), their level or organisation of the body.
- Of the animals, how does their body develop and organise its different parts.
Flat worms | Round worms | Segmented worms |
• Phylum: Platyhelminthes | • Phylum: Nematoda | • Phylum: Annelido |
(i) Dorsoventrally flat, i.e. flat body from top to bottom. | (i) Body is cylindrical from top to bottom. | (i) Body is segmented from head to tail. |
(ii) Not true body cavity. | (ii) Pseudocolom (a type of body cavity) | (ii) True body cavity. |
(iii) Mostly hermaphrodite, i.e. unisexual organisms. | (iii) Bisexual, i.e. sexes are separate. | (iii) May be unisexual or bisexual. |
Answer 20.
1. Valency is the combining capacity of the atom of an element.
Chlorine, Atomic Number = 17
∴ Protons =17, Electrons = 17
∴ Distribution of electrons = K L M
Chlorine needs 1 electron to attain octet electronic configuration.
∴ Its valency is 1 (v It gains 1 electron).
Sulphur, Atomic number = 16
∴ Protons = 16, Electrons = 16
∴ Distribution of electrons = K L M
Sulphur needs 2 electrons to attain octet electronic configuration.
∴ Its valency is 2 (v It gains 2 electrons)
Magnesium, Atomic number = 12
∴ Protons =12, electrons = 12
∴ Distribution of electrons = K L M
Magnesium needs to lose 2 electrons from its outermost shell to attain octet electronic configuration.
∴ Its valency is 2 (v It loses 2 electrons).
2. No. of electrons = 8
No. of protons = 8
-
- Atomic number = No. of protons = 8
- As the no. of electrons = No. of protons
∴ Atom is electrically neutral (No charge). Lysosome
Answer 21.
1.
2. The endoplasmic reticulum helps in the manufacture of proteins and fat molecules or lipids which are important for the functioning of the cell. These proteins and lipids helps in building up of the cell membrane. This process is known as membrane biogenesis.
OR
The tissue that connects/bind, support the organs other tissues and also separates them from other tissues are known as connective tissues.
The different types of connective tissue are:
- Areolar connective tissue: It is found between skin and muscles, around blood vessels, nerves and in the bone marrow. These tissue fills the space inside the organs. It supports the internal organs and helps in repair of tissues.
- Adipose tissue: Adipose tissue stores fat, found below the skin and between internal organs. The cells of this tissue are filled with fat globules. It acts as an insulator due to fat storage.
- Blood: It has a fluid called plasma, in plasma are present red blood cells, white blood cells and platelets. Blood flows to all the organs of our body and helps in transport of gases, digested food, hormones and waste materials to different parts of the body.
- Lymph and Bones: Lymph carries digested fat and lot of white blood cells in the plasma. Bones form the framework that supports the body. It supports the different parts of our body. It is a strong and non-flexible tissue.
- Cartilage: It is present in nose, ear, trachea and larynx. It smoothens the bone surface at joints.
- Tendon: It connects bones and muscles. These tissues are fibrous, flexible and have lot of strength.
- Ligament: It connects bone to bone. It is elastic and has lot of strength.
SECTION-B
Answer 22.
\(\frac { (8-5)g }{ 5g }\) × 100 = 37.5 %
Answer 23.
99.5°C
Answer 24.
Only 1 mole of MgO is formed and hence the mass will be 24 + 16 = 40 g
Answer 25.
The burning of magnesium ribbon produces white dazzling flame; to protect our eyes the dark coloured goggles are used.
Answer 26.
Iron sulphide is the product formed and it reacts with dilute sulphuric acid to form hydrogen sulphide gas. It is a colourless gas with the smell of rotten eggs.
Answer 27.
- Water – Hydrogen and Oxygen
- Sugar – Carbon, Hydrogen, Oxygen
- Magnesium Oxide – Magnesium and Oxygen
- Iron sulphide – Iron and Sulphur
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