Karnataka Class 9 Science Model Question Papers 2023 Set 1

Karnataka Class 9 Science Model Question Papers 2023 Set 1

Choose the correct alternative and Write the complete answer along with its alphabet in the sheet provided:

Question 1. Which of the following reactions is not suitable to verify the law of conservation of mass in a chemical reaction?

1. Precipitation
2. Displacement reaction
3. Redox reaction
4. Nuclear reaction

Answer: 4. Nuclear reaction

Question 2. Which of the following processes is not involved in the carbon cycle?

1. Photosynthesis
2. Burning of fossil fuels
3. Transpiration
4. Respiration

Answer: 3. Transpiration

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Question 3. Which one of the following diseases have been eradicated?

1. Polio
2. Sleeping sickness
3. Smallpox
4. Kala-azar

Answer: 3. Smallpox

Question 4. Which of the following is metal?

1. Iodine
2. Boron
3. Sodium
4. Chlorine

Answer: 3. Sodium

Question 5. particles of matter are continuously moving hence they possess

1. Potential energy
2. Kinetic energy
3. Light energy
4. Heat energy

Answer: 2. Kinetic energy

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Question 6. The valency of Aluminium is

1. 2
2. 1
3. 3
4. 4

Answer: 3. 3

Question 7. An athlete completes one round of a circular track of radius 7m in 10sec his speed is

1. 4.4ms^-1
2. 2.2ms^-1
3. 44ms^-1
4. 0

Answer: 1. 4.4ms^-1

Question 8. If the forces acting on an object are balanced, then

1. The object will be accelerated
2. The object will be in motion.
3. The object will have zero acceleration
4. The object loses its shape.

Answer: 3. The object will have zero acceleration

Question 9. The Rolling of thunder is due to

1. Refraction
2. Dispersion
3. Interference
4. Successive reflection

Answer: 4. Successive reflection

Question 10. The part of the human ear that converts sound vibrations into electrical signals are

1. Tympanic membrane
2. Hammer
3. Cochlea
4. Stirrup

Answer: 3. Cochlea

Match the following:
    A                                      B
Algae                                Fungi
Bread mold                      Thallophyta
moss                                Gymnosperm
cycas                                Bryophyta

Answer:
A                                     B
Algae                            Thallophyta
Bread mold                   Fungi
moss                             Bryophyta
cycas                            Gymnosperm

Answer the following:

Question 1. Suggest a method to liquefy atmospheric gases
Answer: Applying pressure and reducing temperature can liquefy gases.

Question 2. Name the technique to get different pigments from an extract of flower petals.
Answer: chromatography

Question 3. What is atomicity?
Answer: The number of atoms constituting a molecule is known as atomicity.

Question 4. Who discovered the neutron?
Answer: James Chadwick

Question 5. Name the organelle that helps in membrane biogenesis
Answer: endoplasmic reticulum

2023 Karnataka Science Model Papers Class 9 

Question 6. Where is apical meristem found?
Answer: Apical meristem is present at the growing tips of stems and roots to increase the length of the stem and the root.

Question 7. Which division among plants has the simplest organisms?
Answer: Thallophyta

Karnataka Board 9th Science Model Paper 2023 Set 1 Latest Exam Pattern

Question 8. What is the frequency?
Answer: The number of complete oscillations per unit of time is called the frequency (v)

Question 9. What is mechanical energy?
Answer: The sum of the kinetic and potential energies of an object is called mechanical energy.

Question 10. Write an expression for the kinetic energy of an object.
Answer: \( K \cdot E=1 / 2 m v^2\)

Answer The Following

Question 1. The rate of diffusion of liquids is higher than that of solids. Why?
Answer: The rate of diffusion of liquids is higher than that of solids due to the fact that in the liquid state, particles move freely and have greater space between each other as compared to particles in the solid state.

Question 2.Define:

1. crystallization
2. compound

Answer:

1. The process that separates a pure solid in the form of its crystals from a solution is called crystallization.
2. A compound is a substance composed of two or more elements chemically combined.

Question 3. Write the chemical formula of

1. sodium carbonate
2. Ammonium chloride

Answer:

1. \(\begin{array}{cc}
   \mathrm{Na}^{+} & \mathrm{CO}_3 \\
   -1 & -2 \\
   \mathrm{Na}_2 \mathrm{CO}_3
   \end{array}\)
2. \(\begin{array}{cc}
   \mathrm{NH}_4 & \mathrm{Cl} \\
   +1 & -1 \\
   \mathrm{NH}_4 & \mathrm{Cl}
   \end{array}]\)

Question 4. What are Isobars? Give an example
Answer: Atoms of different elements with different atomic numbers which have the same mass number are known as Isobars
Example: \({ }_{20} \mathrm{Ca}^{40}\)  and  \({ }_{18} A r^{40} \)

Question 5. What would happen if the plasma membrane ruptures or breaks down?
Answer: If the organization of a cell is destroyed due to some physical or chemical influences, the content of the cell will come out, as it is protected by a cell membrane.

Question 6. What are the functions of the stomata?
Answer: Exchange of gases between plant and atmosphere Loss of water in the form of water vapor through it.

9th Standard Karnataka Science Sample Paper 2023 Set 1 Important Questions

Question 7. Which organisms are called primitive? How are they different from advanced organisms?
Answer:

• Primitive: Groups of organisms with simple ancient body designs that have not changed much over evolutionary time.
• Advanced: Groups of organisms with complex body designs, that have changed over evolutionary time.

Question 8. Kingdom fungi have a cell wall, but still, they cannot be classified under kingdom Plantae. Give any two reasons.
Answer:

• Saprophytic mode of nutrition.
• The cell wall is made up of chitin.

Question 9. A bus decreases its speed from 80 kmh1 to 60 km 1 in 5s. Find the acceleration of the bus.
Answer:
Initial speed u = 80 Kmh^-1

\(=80 \times \frac{5}{18}=22.22 \mathrm{~ms}^{-1}\)

Final speed v = 60kmh^-1 = 60 x 5/18 = 16.66ms^-1

time take t= 5s

\(a=\frac{v-u}{t}=\frac{16.67-22.22}{5}=\frac{-5.55}{5}\)

a=-1.11ms^-2

Question 10. When will you say a body is in

1. Uniform acceleration
2. Nonuniform acceleration

Answer:

1. When the velocity of the body changes by an equal amount in equal intervals of time, acceleration is said to be uniform,
2. When the velocity of the body changes by an unequal amount in equal intervals of time, then acceleration is non-uniform.

Question 11. Which of the following has greater momentum?

1. An object of 1 kg mass moving with uniform velocity 3ms¹
2. An object of 2kg mass moving with uniform velocity 2ms^-1

Answer:

1. Momentum = m x v = 1 x 3 = 3kgms-1
2. Momentum = m x v = 2 x 2 = 4kgms-1
   The object of mass 2 kg and velocity 2ms’1 has greater momentum

Question 12. Gravitational force acts on all objects in proportion to their masses. Why then, a heavy object does not fall faster than a light object?
Answer: The rate of fall is decided by the acceleration due to gravity which is independent of the mass of the body which is falling. That is why every object larger or small falls at the same rate

Question 13. Why does a block of plastic released under water come up to the surface of the water?
Answer: As the density of plastic is less than that of water buoyant force on plastic is greater than the weight of plastic as a result it comes up.

Question 14. A girl pulls a bucket of water of total mass 5 kg from a well that is 10m deep in lOsec. Calculate the power used by her. (g = 10 m/s²)
Answer:
m=5kg, h= 10m, t = 10sec, g= 10m/s2
w = mgh
= 5x10x10
w= 500 j
P = w/t = 500/10
P = 50 watt

Karnataka State Board Class 9 Science Model Paper 2023 Set 1 with Step-by-Step Solutions

Question 15.Define and give examples of a vaccine
Answer: A vaccine is an antigenic substance prepared from the agent causing the disease, which is given in advance to a body to provide immunity against certain diseases.
Examples: Chickenpox vaccine, hepatitis vaccine

Question 16. In which of the three media, air, water, or iron, does sound travel the fastest at a particular temperature?
Answer: The speed of sound depends on the nature of the medium, sound travels the fastest in solids. Its speed decreases in liquids and it is the slowest in gases. Therefore for a given temperature sound travels fastest in iron.

Question 17.State the difference between egg layers and broiler
Answer:
Egg layer:

• They are fed on protein-rich feed.
• Used for laying eggs

Broiler:

• They are fed oil vitamin-rich supplementary feed for a good growth rate
• Used for meat purposes lot of protein is included in the diet.

Question 18. Name two biologically important compounds that contain both oxygen and nitrogen.
Answer:

1. Amino acids
2. Deoxyribonucleic acid and Ribonucleic acid

Question 19. List the human activities which would lead to an increase in the carbon dioxide content of the air.
Answer:

• combustion of fuels
• Automobiles and factory emissions
• Deforestation
• waste inceration

Class 9 Karnataka Science Sample Papers PDF 

Answer The Following

Question 1. Give the differences between mixture and compound.
Answer:
Mixture:

• Impure matter
• Constituents combine in any ratio to form the mixture
• Constituents retain their properties.
• Constituents can be separated by physical processes.

Compound:

• Pure matter
• Constituents combine in a fixed ratio to form a compound.
• Constituents cannot be separated by physical processes

Question 2. Give the difference between monocots and dicots.
Answer:
Monocots:

• Seeds with one cotyledon
• Leaves have parallel venation.
• Fibrous root system
• Vascular bundles are scattered

Dicots:

• Seeds with two cotyledon
• Leaves have reticulate venation.
• Taproot system
• Vascular bundles are rings.

Question 3. Distinguish between longitudinal and transverse waves.
Answer:
longitudinal waves:

• It needs a medium for propagation
• Particles of the medium move in a direction parallel to the direction of propagation of the distance.
• The wave travels in the form of compression and rarefaction Example: sound waves

Transverse waves:

• It may or may not need a medium for propagation.
• Particles of the medium move in a perpendicular direction of propagation of the disturbance
• The wave travels in the form of a crest and trough. Example: Lightwave.

Karnataka 9th Science Sample Paper 2023 Set 1 for Board Exam Preparation

Question 4. Name all the different types of tissues present in animal
Answer:
There are four main types of tissues:

1. Epithelial tissue is present on the outer and inner lining of the body.
2. muscular tissue is made up of muscles that help in movement.
3. connective tissue connects the different organs in the body.
4. Nervous tissue consists of nerve cells and is present in the nervous system.

Question 5. An 8000kg engine pulls a train of 5 wagons, each of 2000 kg, along a horizontal track. If the engine exerts a force of 40,000N and the track offers a friction force of 5000N, then calculate

1. The net accelerating force
2. The acceleration of the train and
3. The force of wagon 1 on wagon 2

Answer:

1. The net acceleration = Force exerted by the engine – friction force
   = 40,000 N – 5000N
   = 35000N
2. The acceleration of the train =?
   F = 35,000N
   mass of 5 wagons pulled by engine = 5 x 2000
   = 10,000kg
   F = ma
   35000 = 10000 x a
   a = 35,000/10,000 = 3.5m/s²
3. The force of wagon 1 on wagon 2 mass of wagon 2 —>2000 x 4 F =?
   a =f 3.5 m/ s²
   F = ma = 8000 x 3.5
   F = 28,000 N

Question 6.If a bromine atom is available in the form of say two isotopes j5Br(49.7%) and 3jBr(50.3%). Calculate the average atomic mass of the bromine atom.
Answer:
The average atomic mass of=

\(\begin{aligned}
& ={ }_{35}^{79} \mathrm{Br}(49.7)+{ }_{35}^{81} \mathrm{Br}(50.3) \\
& =79 \times \frac{49.7}{100}+81 \times \frac{50.3}{100} \\
& =39.263+40.743 \\
& =80.006 \mathrm{u}
\end{aligned}\)

Karnataka Board 9th Class Science Model Question Paper 2023 Set 1 with Answer Key

Question 7. A freely falling object eventually stops reaching the ground. What happens to its kinetic energy?
Answer: As the object hits the hard ground, its kinetic energy gets converted into

• Heat energy (object and the ground becomes slightly warm)
• Sound energy (sound is heard when the object hits the ground)
• The potential energy of a configuration of the body and the ground (the object and the ground get deformed a little bit at the point of collision)

Question 8. Draw a neat labeled diagram of the animal cell.