CBSE Class 10 Science Worksheet Set A Solved

♦ PHYSICS

1. What type of lens is used to correct (a) Hypermetropia, (b) Myopia? 

2. Why does colour of sun appear red during sunrise and sunset? 

3. A student sitting at the back of a class room cannot read what is written on the black board. Write two causes of his defect. With the help of a ray diagram, show the correction of this defect by using a lens.

4. The far point of a myopic person is 80 cm in front of the eye. Calculate the power of the lens required to correct this problem.

♦ CHEMISTRY

5. What is the role of tartaric acid in baking powder? 

6. A compound X which is prepared from gypsum has the property of hardening when mixed with water.

a) Identify compound X

b) Write its equation of preparation.

7. a. Name the hardest chemical substance present in our body.

b. Sweet tooth may lead to tooth decay. Explain, why? What is the role of tooth paste in preventing cavities.

8. With a labelled diagram describe an activity to show that metals are good conductor of electricity.

♦ BIOLOGY

9. Write one major difference between reflex action and involuntary action. 

10. Name a hormone which promotes growth in plants with its specific cite of production

11. What is the function of receptors in human body? Name any two receptors with their specific function.

12. Write the role of any two hormones in human beings.

→ VALUE POINTS 

♦ PHYSICS

1. Hypermetropia can be corrected with a converging or convex lens. Myopia can be corrected with a diverging or concave lens.

2. Sunrays have to travel longer distance during sunrise and sunset . Red colour having longest wavelength is scattered the least by atmospheric particles. Shorter wavelength colours get scattered away.

3. Causes of short sightednessCorrection diagram of short sight

4. U= ∞

V = -80 cm

F = -80 cm = -0.8 m

P= 1/f = -1/.8

= -1.25 D

1/2

♦ CHEMISTRY

5. Neutralizes the bitterness of cake caused due to the formation of sodium carbonate while heating baking soda.

6. a. Plaster of paris

b. CaSO₄ .2H₂O Heat 373k → CaSO4.1/2 H₂O + 3/4 H₂O

7. a. Calcium Phosphate

b. Bacteria in the mouth produce acids by decomposing sugars and pH of the mouth falls below 5.5 causing tooth decay. Tooth Paste being basic in nature, neutralizes excess acid in the mouth

8. Diagram….

Activity….

♦ BIOLOGY

9. Reflex actions are controlled by spinal cord. Involuntary actions are controlled by midbrain and hind brain. Or Involuntary action needs no stimulus to respond but reflex action needs a stimulus to respond for.(any one difference)

10. Auxin or Gibberellin , growing tips of shoots and roots ½+1/2=1mark

11. Receptors are specialized tips of nerve cells. Any two receptors with specific function.

12. Any two hormones with their function

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