CBSE Class 10 Science Worksheet Set B Solved

♦ PHYSICS

1. What enables the eye to focus objects at different distances? 

2. A person needs a lens of power –5.5 D for correcting his distant vision. For correcting his near vision, he needs a lens of power +1.5. What is the focal length of the lens required for
correcting (i) distant vision (ii) near vision?

3. A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected?

4. (i) Why do different colours deviate through different angles on passing through a prism?
(ii) Why does sky look blue?

♦ CHEMISTRY

5. Why should POP be stored in air tight containers? 

6. A white powdery substance having strong smell of chlorine is used for disinfecting drinking water supply. Identify the substance, give chemical name and equation of its preparation?

7. a. Fresh milk has pH 6. How do you think that the pH will change as it turns into curd?

b. Why does bee-sting cause pain and irritation? What relief can be given in such a case immediately?

8. Give exceptions in the following cases:

a. All metals exist as solid at room temperature.

b. Non-metals do not conduct electricity.

c. Metals are hard.

d. Solid non-metals are brittle.

♦ BIOLOGY

9. How is brain and spinal cord protected in human body? 

10. Name the plant hormone which help/promotes

a) Cell division

b) Growth of the stem and root.

11. Renu’s father has been advised by a doctor to reduce his sugar intake.

a) Name the disease he is suffering from and name the hormone whose deficiency is?

b) Identify the gland that secretes it and mention the function of this hormone.

12. a) A potted plant is made to lie horizontally on the ground. Which part of the plant will show

(i) Positive geotropism

(ii) Negative geotropism

b) Define reflex action

→ VALUE POINTS 

PHYSICS

1. Change in focal length of eye lens by the action of ciliary muscles holding the eye lens

2. f=1/p

F=-0.18m

F= +0.66m

3. (i)Student cannot see beyond certain distance is called myopia

(ii) using concave lens of suitable power

4. (i) *Different color travel through glass with different speed

*Different refractive index for different colour

(ii) blue colour shorter wavelength is scattered most, when visible sun light from the sun

♦ CHEMISTRY

5. On reacting with water it changes into gypsum giving a hard solid mass 

6. Bleaching Powder ….. Calcium oxy chloride

Ca(OH)₂ + Cl₂ → CaOCl₂ + H₂O

7. a. PH decreases…it becomes more acidic.

b. Bee sting injects formic acid or methanoic acid…using a mild base like baking soda gives relief.

8. a) Mercury b) Graphite C) Sodium ,Potassium d) Diamond 

♦  BIOLOGY

9. Brain is protected by cranium (Skull) Spinal cord is protected by vertebral column.

10. 1. Cell division – Cytokinin

2. Growth of the stem - Auxin

11. 1. Disease – Diabetes, Hormone –Insulin

2. Gland – Pancreas, Function – Regulates blood sugar level

12. 1. a. Root b. Shoot

2. Reflex action is an automatic, spontaneous response to a stimuli where brain is not directly involved.

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