CBSE Sample Papers for Class 9 Science Paper 4 are part of CBSE Sample Papers for Class 9 Science. Here we have given CBSE Sample Papers for Class 9 Science Paper 4.
CBSE Sample Papers for Class 9 Science Paper 4
Board | CBSE |
Class | IX |
Subject | Science |
Sample Paper Set | Paper 4 |
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 4 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 passenger in a moving train tosses a coin which falls behind him. State the type of motion of the train.
Question 2.
Velocity time graph of a body is given in the following diagram:
What conclusion can be drawn about the velocity of the body from this graph?
Question 3.
State one feature that is similar and one feature that is dissimilar with respect to mitochondria and plastids.
Question 4.
List four reasons to support that water is a compound and not a mixture.
Question 5.
Why do plant cells have more number and bigger sized vacuoles as compared to animal cells?
Question 6.
What precautions can one take in the school to reduce the incidence of infectious diseases?
Question 7.
- What are the two ways of obtaining fish?
- What is the major problem faced in fish farming? How can it be overcome?
Question 8.
- Name the living component common to both the complex permanent tissues found in plants. What is its function?
- Give any two ways which these tissues differ functionally from each other.
Question 9.
A motorboat starting from rest on a lake accelerates in a straight line at a constant rate of 3.0 ms-2 for 8.0 s. How far does the boat travel during this time?
Question 10.
Study the given graph and answer the following questions from it:
(i) Which part of the graph shows accelerated motion? Calculate the acceleration.
(ii) Which part of the graph shows retarded motion? Calculate the retardation.
(iii) Calculate the distance travelled by the body in first 4 seconds of the journey, graphically.
OR
Derive the relation between force and acceleration. Define one unit of force.
Question 11.
Composition of the nuclei of two atomic species X and Y are given as:
Calculate the mass number of X and Y. What is the relation between the two species?
Question 12.
Why is water essential for life?
Question 13.
A bus decreases its speed from 80 km h-1 to 60 km h-1 in 5 s. Find the acceleration of the bus.
OR
A train starting from a railway station and moving with a uniform acceleration attains a speed of 40 km h-1 in 10 minutes. Find its acceleration.
Question 14.
A goldsmith measured the purity of gold by using a special measuring device. He told the customer that there was an impurity present in gold ornament that he wanted to buy and it was not 22 carats but 18 carats jewellery.
- How can we find the purity of gold?
- What is the unit of relative density?
- What value of goldsmith is reflected in this act?
Question 15.
A stone is thrown vertically upwards with a velocity of 40 m/s and is caught back. Taking g = 10 m/s2, calculate the maximum height reached by the stone.
What is the net displacement and the total distance covered by the stone?
Question 16.
Explain the physical, chemical and biological factors which lead to the formation of soil.
Question 17.
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 18.
Depict the structure of the human ear with the help of a labelled diagram.
Question 19.
How can you separate the following mixtures?
- Sand + iron
- Cream from milk
- Salt + water
- Ammonium chloride + NaCl
- Copper sulphate + water
- Rice and dal (uncooked)
- Gases from air
- Petrol and diesel from crude oil
- Drugs from blood
- Acetone from water
Question 20.
- Explain the working and application of a sonar.
- A sonar device on a submarine sends out a signal and receives an echo 5 s later. Calculate the speed of sound in water if the distance of the object from the submarine is 3625 m.
Question 21.
- Tabulate the differences in the characteristics of states of matter.
- Comment upon the following:
rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy and density.
OR
Give reasons:
- A gas completely fills the vessel in which it is kept.
- A gas exerts pressure on the walls of the container.
- A wooden table should be called a solid.
- We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert.
SECTION-B
Question 22.
For determining the percentage of water imbibed by raisins in a given time, apart from water, raisins and a watch glass, list the other apparatus required for the experiment.
Question 23.
Which of the following will give residue on filter paper?
- Water + CuSO4
- Water + NaCl
- Water + Chalk
- Water + Ammonium chloride
Question 24.
On dropping an iron nail in water and keeping it to for two days. What would be the correct observation?
Question 25.
There are two tubes, A which is wide and B which is narrow, which one is suitable for stethoscope?
Question 26.
How the presence of an air bubble in the liquid taken in the measuring cylinder can affect the volume of the solid?
Question 27.
What should be the lens magnification when you place the slide under a microscope?
Answers
SECTION-A
Answer 1.
Motion is non-uniform motion as the train is accelerating.
Answer 2.
Body is moving with a constant velocity of 4 m/s.
Answer 3.
- Similar feature: Both have their own DNA & ribosomes to make their own proteins.
- Dissimilar feature: Mitochondria is the site of cellular respiration and releases energy, while plastids with chlorophyll is the centre for photosynthesis and stores energy.
Answer 4.
- The composition of water is fixed. (H : O = 1 : 8 by mass)
- Melting point and boiling point of water is fixed.
- Water cannot be separated into its constituent elements by physical methods.
- Water has entirely different properties from those of its constituent elements.
Answer 5.
Plant cells have more number and bigger sized vacuoles because of the following reasons:
- It helps in providing turgidity and rigidity to plant cells.
- It helps the plant cells to withstand wear and tear of the cells.
- It helps in coping with external environment.
- It also helps in storage of essential materials required for growth of plants.
Answer 6.
The precautions that we one can take in school to reduce the incidence of infectious diseases are:
- Using handkerchief while coughing or sneezing.
- Washing hands before eating tiffins.
- Staying at home if suffering from any infectious disease.
- Getting vaccinated before the infection affects.
- Keeping the school surroundings clean, checking for stagnant water.
- Drink clean and boiled drinking water.
Answer 7.
- From natural sources/capture fishing.
From fish farming/culture fishery. - Lack of availability of good quality seeds.
By using hormonal stimulation.
Answer 8.
- 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 directions.
Answer 9.
Answer 10.
(iii) Distance in first four seconds is found by calculating area under the figure AEB.
s = Area of AEB
= \(\frac { 1 }{ 2 } \) (4 – 0) seconds × (4 – 0) m/s
= 8m
OR
Suppose an object of mass ‘m’ is moving along a straight line with initial velocity V. It is uniformly accelerated to velocity V in time ‘t’ by the application of a constant force ‘F’ throughout the time ‘t.
According to the second law of motion,
Rate of change of momentum is directly proportional to the applied force.
It is chosen in a manner, such that K = 1,
∴ F = ma
One unit of force is defined as the amount of force that produces an acceleration of 1 ms 2 in an object of 1 kg mass.
Answer 11.
Mass number of X = Protons + Neutrons
= 6 + 6
= 12
Mass number of Y = Protons + Neutrons
= 6 + 8 = 14
As the atomic number is same, i.e. no. of protons = 6
Both X and Y are isotopes of same element.
Answer 12.
- About 70% of the weight of human beings is due to water.
- All the cellular processes takes place in water as a medium.
- All the reactions that take place within our body and within the cells occurs between the substances that are dissolved in water.
- Transportation of substances from one form to another takes place due to water acting as a medium for transportation.
- Terrestrial life-forms require fresh water for the transportation of substances and also to get rid of the wastes in higher amounts.
- It also helps in keeping the cells moist and thus, maintains the living entity of organisms.
Answer 13.
Answer 14.
- The purity of gold can be obtained by knowing the density of gold.
- Relative density does not have any unit.
- Goldsmith showed the value of honesty and trustworthy.
Answer 15.
After reaching maximum height, the stone falls freely and comes back to its initial position.
Net displacement = 0
Total distance = h + h = 160 m
Answer 16.
Physical factors
- Wind: When wind blows it erodes the big rocks which rubs and hit the other rocks which breaks them into smaller pieces, which are further carried by the wind to form soil.
- Sun: The heat of sun causes expansion of the rocks due to heating during daytime and they contract at night. This expansion and contraction causes cracks in the rocks, which break the rocks slowly to form soil.
- Water: When it rains the force of rainwater erodes the rocks which breaks them to form soil. At times this water enters the cracks present in the rocks and freezes. When temperature falls it break the rocks to forms soil.
Chemical factors
- Water: Water when react with carbonates and phosphates present in the rocks, form soluble compounds which makes the rock hollow from inside.
- Biological factors: Living organisms also help in the formation of soil. Lichen that grows on the moist surface of rocks releases certain substances that causes the rocks surface to powder down and form a thin layer of soil. Other small plant like mosses, are able to grow on this surface now.
The roots of big trees sometimes go into the cracks of rocks and when the tree grows bigger, the cracks of the rocks is forced to a greater extent, which breaks it and led to the formation of soil.
Answer 17.
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 18.
(a) Outer Ear: Pinna, auditory canal and tymphanic membrane.
Pinna – It collects the sound from the surroundings.
Auditory Canal – The sound waves collected pass through this canal.
Tymphanic Membrane – It is a thin membrane which receives the vibrations of sound. A compression reaches the ear drum, the pressure on the outside of the membrane increases and pushes the ear drum inwards, and moves out when the rarefaction reaches the ear drum.
(b) Middle Ear: Consists of three small bones called hammer, anvil and stirrup. The vibrations
are received by these three bones and the strength of vibrations is increased i.e., the sound is amplified and passed to inner ear.
(c) Inner Ear: It consist of cochlea and auditory nerve. Cochlea receives the amplified vibrations and convert them into electrical signals. These electrical signals are sent to the brain via the auditory nerve and brain interprets the signals as sound.
Answer 19.
- Sand + iron – magnetic separation
- Cream from milk – centrifugation
- Salt + water – evaporation
- Ammonium chloride + NaCl – sublimation
- Copper sulphate + water – crystallisation
- Rice and dal (uncooked) – hand picking
- Gases from air – fractional distillation
- Petrol and diesel from crude oil – fractional distillation
- Drugs from blood – chromatography
- Acetone from water – distillation
Answer 20.
1. Working: SONAR consists of a transmitter and a detector and is installed in a boat or a ship as shown in the fig. The transmitter produces and transmits ultrasonic waves. These waves travel through water and after striking the object on the seabed, get 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)
2. Time taken between transmission and reception of signal = 5 sec.
Distance of the object from the sub marine = 3625 m.
Distance travelled by the ultrasound = 3625 × 2 = 7250 m
Speed of sound in water = \(\frac { Distancetravelled }{ Timetaken }\) = \(\frac { 7250 }{ 5 }\) = 1450 m/sec
Answer 21.
1. Differences in the characteristics of three states of matter:
Characteristics |
Solid | Liquid |
Gas |
(i) Shape |
Fixed shape | No fixed shape | No fixed shape |
(ii) Volume | Fixed volume | Fixed volume |
No fixed volume |
(iii) Rigidity/fluidity |
Are rigid, cannot flow | Can flow, not rigid | Can flow, not rigid |
(iv) Intermolecular force | Maximum | Less than solids |
Very less |
(v) Intermolecular space |
Very less | More than solids and less than gases |
Maximum |
(vi) Compressibility |
Negligible | Compressible |
Highly compressible |
2. Comments on:
- Rigidity: The tendency of a substance to retain/maintain their shape when subjected to outside force.
- Compressibility: Matter has intermolecular spaces. The external force applied on the matter can bring these particles closer. This property is called compressibility. Gases and liquids are compressible.
- Filling of a gas container: Gases have particles which vibrates randomly in all the directions due to negligible intermolecular forces. Thus a gas can fill the container.
- Shape: Solids have maximum intermolecular forces and definite shape, whereas liquids and gases takes the shape of container due to less intermolecular forces.
- Kinetic energy: The energy possessed by particles due to their motion is called kinetic energy. Molecules of gases vibrate randomly as they have maximum kinetic energy among all the three states of matter.
- Density: It is defined as mass per unit volume, solids have highest density.
OR
- The molecules of gas have high kinetic energy due to which they keep on moving in all the directions and hence fill the vessel completely in which they are kept.
- A gas exerts pressure on the walls of the container because molecules of the gas are in a constant random motion due to high kinetic energy. These molecules constantly vibrate, move and hit the walls of the container thereby exerting pressure on it.
- The molecules/particles of wooden table are tightly packed with each other, there is no least intermolecular space, it cannot be compressed, it cannot flow, all these characteristics are of a solid. So wooden table should be called a solid.
- We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert. It is because the molecules of air has less forces of attraction between them and a very small external force can separate them and our hand can pass through it easily. But in case of solids, the molecules have maximum forces of attraction, the particles are tightly bound due to this force. Hence large amount of external force is required to pass our hand through a solid.
SECTION-B
Answer 22.
A beaker, thermometer, a filter paper and a weighing machine.
Answer 23.
Water and chalk mixture, because chalk does not dissolve in water while the other substances will dissolve.
Answer 24.
Iron nail will form a brown flaky layer of a substance on its surface, as it undergoes rusting.
Answer 25.
The narrow tube B is suitable for stethoscope, as multiple reflection is more and sound can be heard distinctly.
Answer 26.
The air bubble in the liquid taken in the measuring cylinder for an experiment will affect the volume of the liquid because the air bubble occupies some space in the liquid and this increases the volume of the liquid.
Answer 27.
Initially the lens with lesser power, i.e. 10 X should be used to see the material and for viewing under higher power we should use high power magnifying lens.
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