important questions for science karnataka board exam 2019
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Also, an overview of the important class 10 science questions compiled are given here:
The processes related to organic compounds are given in Column-A and their procedures are given in Column-B. Match them and write the answer along with its letters :
Column A
Column B
(i) Preparation of methane gas
(i) Production of salts of fatty acids starting from oils or fats
(ii) Substitution reaction
(ii) Conversion of liquid oils into solid saturated fats
(iii) Hydrogenation
(iii) Heating fused sodium acetate with soda lime
(iv) Saponification
(iv) Heating an aqueous solution of ammonium cyanate
(v) Burning of methane in air
(vi) Heating ethanol in the presence of acidified potassium permanganate
(vii) Exposing the mixture of methane and chlorine to ultraviolet light.
. In the manufacture of sugar, the container of the sugarcane juice is connected to a vacuum pump. Why ?
4. A person is having the symptoms of thirst and frequent urination for a long time. The blood capillaries in the retina of this person have ruptured causing blood entering into the vitreous humour making it opaque. Name the eye disorder found in this person.
5. What is the Doppler effect ? Mention the two applications of Doppler effect. \
6. Draw the diagram of AC dynamo and label the following parts :
(i) Armature (ii) Brushes.
7. Draw a diagram of a dicot plant and label the following parts :
(i) Flower (ii) Root.
8. State Graham’s law of diffusion. Write the mathematical form of Graham’s law of diffusion. Give an example for this law.
9. How is greenhouse effect caused ? Explain. Name the greenhouse gases.
10. The molecular formula of the first member of a certain group of organic compounds is CH 2 O ( HCHO ). Determine the name and the molecular formula of the third member of this group if the members of this group are in homologous series. What is the general name for this group of organic compounds ?
11. Name the two important non-metallic oxides which cause acid rain
12. Draw the circuit symbol of n-p-n transistor.
13. Lymph plays an important role in protecting the immune system of the body. Justify this statement.
14. Draw a diagram of a blast furnace used in the extraction of iron.
15. Differentiate between Caucasoid and Mongoloid man based on their physical features.
16. What are extrinsic semiconductors ? Name the two types of extrinsic semiconductors.
17. What are ultrasonic waves ? Write any two uses of ultrasonic waves in the field of medicine
Name the steps in the manufacture of common sugar from sugarcane and explain the first step.
20. State Mendel’s law of independent assortment.