CBSE Sample Papers for Class 9 Science Paper 1 are part of CBSE Sample Papers for Class 9 Science. Here we have given CBSE Sample Papers for Class 9 Science Paper 1.
CBSE Sample Papers for Class 9 Science Paper 1
Board | CBSE |
Class | IX |
Subject | Science |
Sample Paper Set | Paper 1 |
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 1 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.
The value of ‘G’ on the surface of earth is 6.67 × 10-11 N m2/kg2. What will be its value on the surface of moon?
Question 2.
How do check-dams helps in increasing ground water level?
Question 3.
The minute hand of a clock is 7 cm long. Find the displacement and the distance covered by it from 9.00 a.m. to 9.30 a.m.
Question 4.
Compare solution, suspension and colloids in terms of
(a) stability
(b) filterability and
(c) tyndall effect.
Question 5.
What is octet? Why would atoms want to complete its octet of electrons?
Question 6.
What are the differences between amphibians and reptiles?
Question 7.
You are provided with a mixture of camphor, salt and soil. Using various techniques how will you separate the components of this mixture. 3
OR
With the help of a labeled diagram, describe an activity to show that the particles of matter are very small. Use the following materials that has been provided to you:
4 beakers, spatula, 4 test tubes, distilled water and few crystals of potassium permanganate.
Question 8.
- Name the plant tissues found in the husk of a coconut and also identify the chemical which is responsible for its stiffness.
- Give one way in which it differs from parenchymatous cells.
Question 9.
What is AIDS? How does a person get affected with HIV?
Question 10.
List 3 possible effects that can be produced by force.
A boy throws a ball upwards with a speed of 10 m/s. The mass of the ball is 400 g. Calculate
- Weight of the ball
- Initial momentum of the ball
OR
On what factor does the gravitational potential energy depends?
Question 11.
Define echo. Give two applications of echo.
Question 12.
What is air pollution? What are its causes? Give its two harmful effects?
Question 13.
What are three limitations for the approach to deal with infectious diseases?
Question 14.
- Which two factors bring about loss of food grains during storage? Give one example for each.
- State any two control measures to be taken before grains are stored.
Question 15.
State the universal law of Gravitation.
The mass of the sun is 2 × 1030 kg and that of the earth is 6 × 1024 kg. If the average distance between the sun and the earth is 1.5 × 1011 m, calculate the force exerted by the sun on the earth and also by the earth on the sum.
Question 16.
Rama tested the solubility of four substances at different temperatures and found (in grams) how much of each substance is dissolved in 100 g of water to form a saturated solution.
S.No. | Substance Dissolved (in grams) | Temperature (K) | ||
293 K | 313 K | |||
(i) | Ammonium chloride | 37 g | 41 g | 55 g |
(ii) | Potassium chloride | 35 g | 40 g | 46 g |
(iii) | Sodium chloride | 36 g | 36 g | 37 g |
(iv) | Potassium Nitrate | 32 g | 62 g | 106 g |
- Which substance is least soluble in water at 293 K?
- Which substance shows maximum change in its solubility when temperature is raised from 293 K to 313 K?
- Find the amount of ammonium chloride that will separate out when 155 g of its solution at 333 K is cooled to 293 K?
- What is the effect of change of temperature on the solubility of a salt?
- What mass of sodium chloride would be needed to make a saturated solution in 100 g of water at 293 K?
Question 17.
(a) Draw a neat and labelled diagram of the apparatus used to separate the components of blue-black ink. Name the process and state the principle involved.
(b) Identify the physical and chemical changes from the following:
- Burning of magnesium in air
- Tarnishing of silver spoon
- Sublimation of iodine .
- Electrolysis of water
Question 18.
Compare all the proposed models of an atom given in this chapter.
Question 19.
- State one difference and one similarity between boiling and evaporation.
- What is sublimation? Name two substances that show this property.
- Using kinetic molecular theory give difference between solid and liquid particles.
Question 20.
What is meant by atomic mass, gram atomic mass of an element? Why is the atomic mass have different expressions i.e., u and ‘g’?
Question 21.
The velocity time graph for an object is shown in the following figure.
- State the kind of motion that the above graph represents
- What does the slope of the graph represent?
- What does the area under the graph represent?
- Calculate the distance travelled by the object in 15 s.
OR
State all 3 Newton’s law of motion. What is inertia and momentum?
SECTION-B
Question 22.
Iodine solution was added to four samples of food I, II, III, IV. Which will develop blue-black colour?
- Boiled rice
- Crushed potatoes
- Boiled arhar dal
- Powdered arhar dal
Question 23.
In a plant, name two features which you would examine to categorise it into a monocot or a dicot plant.
Question 24.
In a mixture containing ammonium chloride, sand and common salt as components, if instead of common salt sulphur is present, how would you carry out the separation process then?
Question 25.
A cuboid of mass 5 kg and dimensions 5 × 10 × 20 cm is given, how will you place it so that
- maximum pressure is exerted and
- minimum pressure is exerted?
Question 26.
What is the function of cover slip while mounting a slide?
Question 27.
To make a solution, 40 g of common salt is dissolved in 280 g of water. Calculate its concentration in terms of mass by mass percentage of the solution.
Answers
SECTION-A
Answer 1.
6.67 × 10-11 N m2/kg2. It has the same value on the surface of the moon.
Answer 2.
By stopping the rain water from flowing away.
Answer 3.
Length of minute hand
l = 7 cm
Distance covered by it = \(\frac { 1 }{ 2 } \) × circumference = πr = \(\frac { 22 }{ 7 } \) × 7 = 22 cm
Displacement = 2l = 2 × 7 cm = 14 cm
Answer 4.
Solution |
Colloid |
Suspension |
|
(a) Stability |
Stable | Stable | Unstable |
(b) Filterability | Not filterable | Not filterable |
Can be filtered |
(c) Tyndall effect |
No | Yes |
Yes |
Answer 5.
The outer shell of an atom when filled with 8 electrons is said to posess octet of electrons. To become stable atoms want to complete its octet of electrons.
Answer 6.
Amphibians | Reptiles |
(i) Adapted to live in water and land, can breathe by skin in water. | Can live in water but need to come to the surface to breathe in oxygen. |
(ii) Skin is moist and soft. | Skin is hard. |
(iii) Respiration is either through gills or lungs. | Respiration is always through lungs. |
(iv) They can jump. | They move by crawling. |
(v) Development is indirect, through tadpole stage. | Development is direct with no intermediate stage in the life cycle. |
(vi) They have three chambered heart. | They have three chambered heart but crocodiles is an exceptional reptile having four chambered heart. |
Answer 7.
In the first step, camphor can be separated by heating and sublimation.
Then the mixture can be dissolved in water, soil will not dissolve and can be separated by filtration.
The dissolved salt can be obtained by the evaporation of the filtrate.
OR
Description: Take a crystal of potassium permanganate and dissolve it into 100 ml of water. Observe the colour of the solution. Take 1 ml of this solution and put it into 9 ml of water, taken in another beaker and shake it well. Observe the colour of this solution.
Keep on diluting this solution for about 8 to 10 times and observe the colour. It will be observed that with every dilution, the colour becomes light but is still visible. So it can be concluded that one crystal of KMnO4 must be made up of millions of tiny particles.
Answer 8.
- Sclerenchyma and Lignin
- Sclerenchyma consists of dead cells/with very thick cell walls/provides strength to the plant parts.
Parenchyma consists of living cells/with thin cell walls/stores food.
Answer 9.
AIDS means Acquired Immuno Deficiency Syndrome, which is caused due to HIV—human immuno deficiency virus. This virus reduces the immunity of human body. Therefore if any microbe enters the body of a person it causes disease killing the person.
The virus is transmitted from infected person to other person by any of the following way:
- Blood transfusion.
- From mother (infected) to the baby in the womb.
- From mother’s milk to lactating baby.
- By sexual contact.
- Reusing the needle used by an infected person.
Answer 10.
Force can change the shape of the body, can accelerate the motion of the body or can stop a moving body. It can also change the direction of the motion of a body.
(a) Weight of the ball = Mass x Acceleration due to gravity (g)
= 0.4 × -10 = -4 N
-ve sign indicates weight (force) acts downwards.
(b) Initial momentum = Mass (m) × Initial velocity (u)
= 0.4 × 10 = 4 kg m/s2
OR
Gravitational potential energy depends upon the height from the ground level/zero level we choose.
For example, A ball tossed from 2nd floor having height h from its roof but from the 1st floor its height will be h’.
Then, ∵ h’ > h
∴ The potential energy of ball w.r.t. to 1 st floor level is more as compared to the 2nd floor.
Answer 11.
The distinct sound heard after reflection of sound from the source is called echo. For echo, the distance of reflecting surface from the source of sound should be more than 17.2 m.
- Ships use echo technique “SONAR” which helps in locating the depth, distance, direction
and speed of underwater objects. - Ceilings of concert halls are made curved so that sound after reflection reaches all comers of the hall.
Answer 12.
The contamination of air with unwanted gases, particles like dust etc which makes it unfit for inhalation is called air pollution.
Causes:
- Burning of fossil fuels releasing SO2, CO2 and NO2 gases.
- Burning of fuels releasing unbumt carbon particles and smoke.
- Smoke from industries.
Harmful effects:
- It causes respiratory problems.
- It causes allergies, asthma, cancer and heart diseases.
Answer 13.
The three limitations are:
- If someone has a disease and his/her body functions are damaged, then he/she may never recover completely.
- As the treatment will take time, the person suffering from a disease is likely to get bed ridden for sometime.
- The infected person can serve as a source from where the infection may spread to other people too.
Answer 14.
- Biotic factors – Insects/ Rodents/ Fungi/ Mites. (Any one)
Abiotic factors – Inappropriate temperature/ Inappropriate moisture. - Any two of the following measures:
- Strict cleaning of product before storage.
- Proper sundrying and then drying it in shade.
- Fumigation
- Systematic management of warehouse.
Answer 15.
Every object in the universe attracts every other object with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. This force is along the line joining the centres of the two objects.
Force of the earth on the sun is the same.
Answer 16.
- Potassium Nitrate
- Potassium Nitrate
- 18 g
- Solubility of a salt increases with increase in temperature.
- 36 g
Answer 17.
Process: Chromatography
Principle: The coloured component that is more soluble in the mobile phase rises faster and in this way, the colours of different dyes present in blue-black ink get separated.
(b)
- Chemical change
- Chemical change
- Physical change
- Chemical change
Answer 18.
According to all these models of atoms, an atom on the whole is electrically neutral.
Answer 19.
1. Similarity: Liquid state is changed into the gaseous state.
Difference:
Evaporation |
Boiling |
It is a surface phenomenon, i.e. water molecules at the surface gains energy to change their state. | It is a bulk phenomenon. All (bulk) the water molecules in the liquid gains energy to change their state. |
2. The transfer of solids directly into gaseous phase without attaining the liquid state is called sublimation.
Camphor, naphthalene, dry ice (any two).
3. In solids, particles are closely packed with less intermolecular spaces but very strong forces of attraction.
In liquids, the particles are apart from each other with more kinetic energy and keep on moving past each other, as they have less forces of attraction and more intermolecular spaces.
Answer 20.
Atoms are very tiny and their individual masses cannot be calculated as it is negligible. Hence the mass of atoms is expressed in units with respect to a fixed standard. Initially hydrogen atom with mass 1 was taken as standard unit by Dalton. Later, it was replaced by oxygen atom (O = 16). But due to their isotopes the masses were found in fractions instead of whole number. Hence, carbon (C = 12) isotope was later taken as standard unit and it was universally accepted.
The atomic mass unit is equal to one twelfth ( \(\frac { 1 }{ 2 } \) ) the mass of an atom of carbon-12, its unit is u.
Gram atomic mass: When the atomic mass of an element is expressed in grams, it is called the gram atomic mass of the element. The mass of atoms, molecules is expressed in V and the mass of moles, i.e. molar mass is expressed in g.
Answer 21.
- Uniformly accelerated motion
- Acceleration of the object
- Distance travelled by the object
- Distance = Area of the triangle ODC
OR
- Newton’s I law of motion: An object remains in a state of rest or of uniform motion in a straight line unless acted upon by an external unbalanced force.
- Newton’s II law of motion: The rate of change of momentum of an object is directly proportional to the applied unbalanced force and acts in the direction of the force.
- Newton’s III law of motion: To every action, there is an equal and opposite reaction and they act in opposite directions.
- Inertia: The natural tendency of an object to resist the change in the state of rest or of uniform motion is called inertia.
- Momentum: The momentum of an object is the vector product of its mass and velocity and it has the same direction as that of the velocity. Its S.I. unit is kg m/s.
- p=m × v
SECTION-B
Answer 22.
Sample I and II will develop blue black color with iodine as both the samples contain starch in it.
Answer 23.
In any given plant, to classify it as monocot or dicot, we need to see the venation in leaves, reticulate/net like pattern is for a dicot plant and parallel venation is for a monocot plant.
The flowers are trimerous (three petals) in monocots and pentamerous(five petals) in dicots.
Answer 24.
The steps would be:
- Sublimation to remove ammonium chloride which will sublime and can be collected separately.
- Dissolve sulphur in carbon disulphide and filter, the filtrate would be dissolved sulphur and the sand can be separated.
- By heating the filtrate at controlled temperature, sulphur can be collected.
Answer 25.
- To get maximum pressure minimum contact the surface area in contact should be least, i.e. 5 cm × 10 cm.
- To get minimum pressure the surface area of contact should be maximum, i.e. 10 cm × 20 cm.
Answer 26.
A cover slip keeps the slide mounted material at a fixed position, the covering prevents the material from drying and also protects the lens of the microscope from getting in contact with the material which can lead to fungul growth on the lens.
Answer 27.
Mass of solute = 40 g
Mass of solvent = 280 g
Mass of solution = Mass of solute + Mass of solvent
= 40 g + 280 g = 320 g
Mass percentage of solution = \(\frac { Massofsolute }{ Massofsolution } \) × 100
= \(\frac { 40 }{ 320 } \) × 100
= 12.5 %
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