Karnataka Class 9 Science Model Question Papers 2023 Set 4

Karnataka Class 9 Science Model Question Papers 2023 Set 4

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

Question 1. An example of a scalar quantity is

1. Force
2. Speed
3. Velocity
4. Acceleration

Answer:  2. Speed

Question 2. The area under the velocity time graph represents

1. Distance traveled
2. Displacement
3. Speed
4. Velocity

Answer: 1. Distance traveled

Question 3. Who introduced the system of scientific nomenclature of organisms

1. Robert Whittaker
2. Carolus linnaeus
3. Robert Hooke
4. Ernst Haeckel

Answer: 2.Carolus linnaeus

Karnataka 9th Standard Science Model Paper 2023 Set 4 Free PDF with Solutions

Question 4. The structural and functional unit of nerve tissue is

1. Axon
2. Dendrite
3. Neuron
4. Myelin

Answer: 3. Neuron

Question 5. Which of the following is an element?

1. Carbon
2. Water
3. Sodium chloride
4. Carbon dioxide

Answer: 1. Carbon

Question 6. Organelle without a cell membrane is

1. Golgi apparatus
2. Mitochondria
3. Chloroplast
4. Ribosome

Answer: 4. Ribosome

Class 9 Karnataka Science Model Paper 2023 Set 4 Solved Questions PDF

Question 7. Pathogens of disease are

1. viruses
2. Bacteria
3. Protozoa
4. All of the above

Answer: 4. All of the above

Question 8. What are the functions of cuboidal epithelium?
Answer:

1. It helps in absorption, excretion, and secretion.
2. It provides mechanical support.

Question 9. Mention the general characteristics of Porifera
Answer:

1. Animals with pores all over their body.
2. The body is not well differentiated
3. Non-motile animals remain attached to the solid support.
4. The body is covered with a hard outer skeleton Example: second

Question 10. A trolley, while going down an inclined plane, has an acceleration of 2cms^-2. What will be its velocity 3s after the start?
Answer: Initial velocity of the trolley u = 0 Acceleration a = 2 cms’2 = 0.02 m/s2 Time t = 3s
According to the first equation of motion v = u + at v = 0 + 0.02 x 3 v = 0.06 m/s.

Question 11.Draw a neat labeled diagram of paramecium
Answer:

Question 12. How does a karate player breaks a shab of ice with a single blow?
Answer: Akarate player applied the blow with large velocity in a very short interval of time on the ice slab which therefore exerts a large amount of offeree on it and suddenly breaks the ice slab.

Question 13. While swimming why do we feel light?
Answer: The swimmer is exerted by an upward force by
water, this phenomenon is called buoyancy and it makes the swimmer feel light.

Question 14. A certain household has consumed 250 units of energy during a month. How much energy is this in joules?
Answer:
Energy consumed in a month = 250u
= 250kwh
= 250 kw x 1h
= 250 x 1000w x 3600s
= 900,000,000j
= 9.0 x108 J

Question 15. What are crest and trough?
Answer: When a wave is propagated as represented. A peak is called the crest and a valley is called the trough of a wave.

Question 16. Name the organs affected due to the following diseases.

1. Malaria
2. Jaundice
3. Typhoid

Answer:

1. Malaria: Infects liver and red blood cells
2. Jaundice: infects the liver
3. Typhoid: Infects blood.

Question 17. Mention the activity that pollutes the water resources.
Answer:

1. pollutants from industries
2. agricultural wastes like fertilizers & pesticides
3. sewage water
4. Thermal water from certain industries

Question 18. Name a few varieties of bees used for commercial honey production.
Answer:

1. Apis cerana indica – Indian, bee
2. Apis dorsata – rock bee
3. Apis florae – the little bee
4. Apis mellifera – Italian bee variety

Karnataka Board 9th Science Model Paper 2023 Set 4 Latest Exam Pattern

Question 19.Define

1. Mixed cropping
2. Intercropping

Answer:

1. Mixed cropping: It is a method in which two or more crops grow simultaneously on the same piece of land. Example: Wheat + grain
2. Intercropping: It is a method of growing two or more crops simultaneously on the same field in a definite pattern.Example: soybean + maize

Question 20.Define late the at of vaporization 
Answer: Latent heat of vaporization is the heat energy required to change 1kg of a liquid to gas at atmospheric pressure at its boiling point.

Question 21. What is a colloidal solution? Give an example
Answer: It is a heterogeneous, solution that appears to be homogeneous, particle size is very small and so cannot be seen with the naked eye but it is stable. Example: milk and blood.

Karnataka State Board Class 9 Science Model Paper 2023 Set 4 with Step-by-Step Solutions

Answer the following:

Question 1. Neha’s mother is a good cook. She uses natural colors to give colors to different foods. She uses turmeric yellow color, spinach for the green color, and pomegranate for the red color. She always avoids synthetic colors.

1. Name the technique used to separate pigments from natural colors.
2. Write the principle of that technique.
3. Explain the values that are displayed by Neha’s mother.

Answer:

1. Chromatography
2. Different colors got separated due to dissolution in the same solvent and different rates of rising due to different rates of adsorption.
3. Awareness, caring attitude for the family skillful person

Question 2.

1. Differentiate between epidermal and cork cells.
2. Why are they called protective tissues?

Answer:
Epidermal:

1. single layered
2. living
3. secrete cutin
4. present in younger plants

Cork:

1. multi-layered
2. Non-living
3. secrete suberin
4. present in older plants

They protect the plants from mechanical injury and infection. They prevent loss of water.

Question 3. State any three differences between the crypto game and phanerogamae.
Answer:
Cryptogame:

1. Non-flowering plants
2. seedless plants
3. Body parts not well differentiated
4. Have an alternation of generation

Phanerogamae:

1. Flowering plants
2. Bear seeds
3. Body parts well differentiated
4. Have multicellular sex organs and are embryonic

Karnataka Class 9 Science Previous Year Model Paper 2023 Set 4 Download PDF

Question 4. Draw the diagram of the carbon cycle in nature
Answer:

Answer the following:

Question 1. State the reason for the following statements :

1. The ceilings of good conference halls and concert halls are curved.
2. We hear the sound produced by the humming bees while that of the moving pendulum is not heard
3. Sound waves are mechanical waves
4. People in their old age suffering from hearing loss, wear hearing aids properly.

Answer:

1. Because sound after reflection reaches the target audience
2. Because the frequency of vibration of the wings of bees is in the audible range but the frequency of vibrations of the pendulum is below 20Hz and hence not heard.
3. Because they need a material medium to travel
4. Because hearing loss may occur due to an accident or listening to loud sounds / biologically. A hearing aid amplifies the signals and makes it easier to be heard.

Question 2.

(1) Write the chemical formula and name of the compounds formed between

1. Barium and nitrate ions
2. Ferrous and sulfide ions

(2) State the law of definite proportion

(3) Calculate the number of moles of 36gm of water

Answer:

(1)

1. Ba(NO₃)₂
2. Fes

(2) In a chemical substance the elements are always present in definite proportions by mass.

(3) 18gm of H₂O = 1 mole
36gm of H₂O = \(\frac{1}{18} \times 36^2\)
= 2 moles

9th Standard Karnataka Science Sample Paper 2023 Set 4 Important Questions

Question 3.

1. How is the force of attraction depend on the masses of objects and the distance between them?
2. The mass of the earth is 6 x10²⁴kg and that of a natural satellite is 6.5 x10²⁰kg. If the distance between them is 3.35 x10⁶km. Calculate the force exerted by the earth on it. (G = 6.7 x10^-11NM²kg^-2)

Answer:

1. The Force of attraction between the two bodies is inversely proportional to the square of the distance between them.
2. G = 6.7 x 10^-11NM²/kg^-2
   m1 = 6 x10²⁴ , m2 = 6.5 x10²⁰
   d = 3.35 x10⁶ km= 3.35 x10⁹km
   \(\mathrm{F}=\frac{\mathrm{GM}_1 \times \mathrm{M}_2}{\mathrm{~d}^2}\)\(\begin{aligned}
   & =\frac{6.7 \times 10^{-11} \times 6 \times 10^{24} \times 6.5 \times 10^{20}}{\left(3.35 \times 10^9\right)^2} \\
   & =\frac{6.7 \times 6 \times 6.5 \times 10^{33}}{11.225 \times 10^{18}} \\
   & =\frac{261.3 \times 10^{15}}{11.225}
   \end{aligned}\)F = 2327.85 x 1014 N

Question 4. Which separation techniques you will apply for the separation of the following mixtures?

1. Oil from water
2. Camphor from sand
3. Cream from milk
4. Sodium chloride from its solution in water.

Answer:

1. Separating funnel
2. Sublimation
3. Centrifugation
4. Evaporation