CBSE Sample Papers for Class 9 Science Paper 2 are part of CBSE Sample Papers for Class 9 Science. Here we have given CBSE Sample Papers for Class 9 Science Paper 2.
CBSE Sample Papers for Class 9 Science Paper 2
Board | CBSE |
Class | IX |
Subject | Science |
Sample Paper Set | Paper 2 |
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 2 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.
A lamp consumes 1000 J of electrical energy in 10 s. What is its power?
Question 2.
Name the proteins present in muscles which are responsible for movement.
Question 3.
A man weighs 600 N on the surface of earth. What would be his mass and weight on the surface of moon? (take of gearth = 10 m/s2).
Question 4.
State the location on earth where the value of g is
(i) maximum and
(ii) minimum.
Justify your answer.
Question 5.
What is lactometer and hydrometer?
Question 6.
Define osmosis. In which way it is different from diffusion.
Question 7.
Explain with two examples from your daily life where cooling is caused by evaporation.
Question 8.
A student got injured on the play ground. On the wound tincture of iodine was applied. Explain what is tincture iodine and how will it affect the wound.
Question 9.
- A spoonful of sugar is added to a beaker containing 500 ml of water and stirred for a while. State any two observations that you will make.
- Account for your observations.
Question 10.
State the law of inertia. Why do we fall in the forward direction if a moving bus stops suddenly and fall in the backward direction if it suddenly accelerates from rest?
Question 11.
Number of electrons and protons are the same in an atom. Then why it is wrong to say that the atomic number of an atom is equal to its number of electrons?
Question 12.
What are fluids? Why is Archimedes principle applicable only for fluids? Give the applications of Archimedes principle.
OR
Define power, give its unit and define it.
Question 13.
In which direction do the fallowing forces act when a body is in motion.
Gravitational, frictional and centripetal force.
Question 14.
Give 6 points of difference between Monocot and Dicot plants.
OR
- Name the unwanted plants that grow in the farm?
- Why do farmers remove them from the farm field?
- Mention one control measure which can stop them from growing.
Question 15.
Give the common methods of transmission of diseases.
Question 16.
- Draw a plant cell and label seven important organelles found in it.
- Name one organelle that can make some of its protein in a plant cell and mention one function of it in a cell.
Question 17.
Explain the following:
- An object increases its energy when raised through a height.
- Energy is neither created nor destroyed then from where do we get energy.
- When we push the wall, the wall does not move and no work is done.
Question 18.
Explain how animals in Vertebrata are classified into further subgroups.
Question 19.
Explain the working and applications of a SONAR.
OR
Explain how defects in a metal block can be detected using ultrasound.
Question 20.
Calculate
- the mass of one atom of oxygen
- the mass of one molecule of oxygen
- the mass of one mole of oxygen gas
- the mass of one ion of oxygen
- the number of atoms in 1 mole of oxygen molecule
Question 21.
Give the hierarchy of 5 kingdom classification of living world.
SECTION-B
Question 22.
A student observed the slide of spirogyra under a microscope. Name two prominent features the student should observe in the slide.
Question 23.
A student made a diagram of posterior end of cockroach studied in the lab
Identify the cockroach as male or female with reason.
Question 24.
If you are given a mixture of iron filings and sulphur powder. How will you separate the components?
Question 25.
Represent a wave with low and high amplitude.
Question 26.
How do cold blooded animals protect themselves from extreme temperatures?
Question 27.
What are the different adulterants commonly used in foods?
Answers
SECTION-A
Answer 1.
Power = \(\frac { Workdone }{ Timetaken } \)
= \(\frac { 1000 }{ 10 } \) = 100 watts
Answer 2.
Actin and Myosin.
Answer 3.
Answer 4.
- Value of g is maximum at the poles as the earth is flat at the poles and poles are more closer to the centre of the earth.
- value of g is minimum at the equator as the earth is bulging at the equator and has the maximum distance from its centre.
Answer 5.
- Lactometer is a device used to find the purity of a given sample of milk.
- Hydrometer is a device used to find the density of a liquid.
Answer 6.
- Osmosis: Movement of water from a region of higher concentration to the region of lower concentration through a semipermeable membrane is called osmosis. It is only the movement of solvent/liquid particles.
- Diffusion: It is the movement of particles from one medium to another from higher concentration to lower concentration. It is applicable for any medium. Semipermeable membrane is not required.
Answer 7.
The evaporation of sweat gives us the cooling effect.
The loss of water by transpiration is due to evaporation, which cools down the leaves and hence under the tree we get cooling effect.
Answer 8.
Tincture of iodine or iodine tincture is also called weak iodine solution. It is usually 2-7% elemental iodine, along with potassium iodide or sodium iodide, dissolved in a mixture of ethanol and water.
Tincture of iodine used to disinfect the area around a wound as its is an antiseptic.
Answer 9.
- Observations:
- Sugar disappears in water.
- The volume of water does not increase.
- Inference/Interpretation: There is lot of space between water molecules, which the sugar molecules occupy and thus, they disappear without any increase in volume of water.
Answer 10.
Law of inertia: An object remains in its state of rest or of uniform motion in a straight line until and unless acted upon by an external unbalanced force.
When a moving bus stops suddenly, the bus slows down but our body tends to remain in the state of motion due to the inertia of motion. Hence we get a forward jerk.
Sudden start of the bus brings motion to the bus as well as our feet but the rest of the body still has the inertia of rest, so we fall/get jerked in the backward direction.
Answer 11.
Atomic number ≠ Number of electrons, although number of protons = number of electrons because the electron’s number can change in an atom by loss, or gain of it.
However the proton number remains the constant (as it does not take part in loss or gain during chemical reactions).
Answer 12.
Fluids are the substances which can flow, e.g. gases and liquids are fluids. Archimedes principle is based on the upward force exerted by the fluids on any object immersed in the fluid. Hence it is applicable only for fluids.
Applications of Archimedes’ principle:
- It is used in designing of ships and submarines.
- It is used in designing of lactometer, which is used to determine the purity of milk.
- It is used in designing of hydrometer that is used to determine the density of a liquid.
OR
Power is defined as the rate of doing work.
Power = \(\frac { Workdone }{ Timetaken } \),
∴ p = \(\frac { W }{ t } \)
Unit → Watt
Definition of Watt. When 1 Joule work is said to be done in 1 second, the power of the body doing work is said to be 1 watt.
Answer 13.
The gravitational force is acting downwards, frictional force is acting in opposite direction of the motion and centripetal force is acting or pulling the body towards the centre of the moving body in circular motion.
Answer 14.
Monocot Plants | Dicot Plants |
(i) Fibrous root | Tap root |
(ii) Parallel venation | Reticulate venation |
(iii) Seeds with one cotyledon | Seeds with two cotyledon |
(iv) Vascular bundles are scattered | Vascular bundles are arranged in rings |
(v) Flowers are trimerous | Flowers arepentamerous, flowers ortetramerous |
(vi) Secondary growth is absent | Secondary growth is present |
OR
- Weeds
- Weeds compete for the nutrients with the crops in the soil and take up the major nutrients, thus depriving the crops from it.
- Pulling them out manually or using organic pesticides.
Answer 15.
The common methods of transmission of diseases are:
- By air – cough, cold, tuberculosis
- By food and water – typhoid, jaundice
- By mosquito bites – malaria
- By rabid animal – rabies
- By direct contact – skin infection, small pox, AIDS
- By indirect contact – typhoid, chickenpox
Answer 16.
1. Seven labels:
- Chloroplast
- Ribosomes
- Mitochondrion
- Golgi apparatus
- Lysosome
- Endoplasmic reticulum
- Nucleus
2. Mitochondrion, it releases energy required for various chemical activities needed for the life processes.
Answer 17.
- Let there be stone having mass ‘M’, when it is raised through a certain height, energy is applied on it, this energy gets transformed and is gained by the stone hence its energy increases.
- Energy is present in every object in some or the other form. It exists in Sun, planet, wind, water etc. This energy gets transformed and we get the required energy, because of its transformation into different form.
For e.g. plants convert solar (due to chemical reaction) into food energy and we eat green vegetables and products of plants and this energy enters our body. - Work is said to be done, when force is applied on the body and it moves to a certain distance. When a wall is pushed there is no displacement and hence we can say that work done is zero.
Answer 18.
Vertebrata is divided into two super-classes, viz. Pisces and Tetrapoda. Animals of Pisces have # streamlined body with fins and tails to assist in swimming. Animals of Tetrapoda have four limbs for locomotion.
Tetrapoda is further classified into the following classes:
- Amphibia: These are adapted to live in water and on land. They can breathe oxygen through skin when under water and through lungs when on land.
- Reptilia: These are crawling animals. Their skin is hard to withstand the extreme temperatures.
- Aves: Their forelimbs are modified into wings to assist in flying. Beaks are present in them. Their body is covered with feathers.
- Mammalia: They have mammary glands to nurture their young ones. Their skin is covered with hair. Most of the animals are viviparous.
Answer 19.
Working: SONAR consists of a transmitter and a detector and is installed in a boat or a ship as shown in the figure. The transmitter produce and transmits the ultrasonic waves. These waves travel through water and after striking the object on the seabed, it gets reflected back and are sensed by the detector. The detector converts the ultrasonic waves into electrical signals which are appropriately interpreted. The distance of the object that reflected the sound wave can be calculated by knowing the speed of sound in water and the time interval between the transmission and reception of the ultrasound.
Let, Depth of the sea = d
Speed of sound in sea water = v
Time taken for transmission and reception of signal = t
Time taken to travel a distance, d = \(\frac { t }{ 2 } \)
∴ Depth of the sea, d = \(\frac { t }{ 2 } \) × v (∵ Distance = Speed × Time)
OR
Ultrasounds can be used to detect cracks and flaws in metal blocks. Metallic components are used in the construction of big structures like buildings, bridges, machines and scientific equipments. The cracks or holes inside the metal blocks, which are invisible from outside reduces the strength of the structure. Ultrasonic waves are allowed to pass through the metallic block and detectors are used to detect the transmitted waves.
If there is even a small defect, the ultrasound gets reflected back indicating the presence of the flaw or defect.
Answer 20.
1. Mass of one atom of oxygen
1 mole of oxygen atom =16 gm
= 6.022 × 1023 atoms.
Mass of one atom of oxygen = \(\frac { 16 }{ { 6.022\times 10 }^{ -23 } } \)
= 2.65 × 10-23
2. Mass of one molecule of oxygen
1 molecule of oxygen = O2
= 2 × 16
= 32 u
3. Mass of one mole of oxygen gas
1 mole of oxygen gas is O2 = 32 u or 32 g
4. Mass of one ion of oxygen
1 mole of oxygen = 6.022 × 1023 atoms
= 16 g
Mass of one ion of oxygen = \(\frac { 16 }{ { 6.022\times 10 }^{ -23 } } \)
= 2.65 × 10-23 g
5. Number of atoms in one mole of oxygen molecule
1 mole of oxygen molecule, i.e.
O2 = 6.022 × 1023 molecules
1 molecule of O2 = 2 atoms
∴ Number of atoms in 1 mole of oxygen molecule = 6.022 × 1023 × 2 atoms
= 1.2044 × 1024 atoms
Answer 21.
SECTION-B
Answer 22.
Spirally arranged chloroplast and filamentous body with rectangular cells arranged end to end and nucleus in one side of the chloroplast.
Answer 23.
The cockroach is the male cockroach as it has anal style.
Answer 24.
Use magnet to separate the iron filings and then dissolve the remaining mixture in carbon disulphide and filter to obtain the minute particles of iron filings.
Answer 25.
Answer 26.
In extreme climatic conditions all the cold blooded animals hide/burrow themselves under the soil/earth and goes for a long sleep.
Summer sleep is aestivation and Winter sleep is hibernation.
Answer 27.
The commonly used adulterants in food are:
- Black pepper: dry seeds of papaya
- Honey: jaggery
- Red chilli powder: red brick powder
- Mustard seed: argemone seeds
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