CBSE Class 10 Science Worksheet Set C Solved

♦ PHYSICS

1. What do you mean by power of accommodation of an eye? 

2. Stars appear to twinkle in the sky but planets do not. Give reason. 

3. A person is unable to see objects beyond 30cm clearly. Suggest the type and power of the lens required to correct this defect.

4. What is hypermetropia? Write two causes for it. Draw the ray diagrams representing the cause and correction for hypermetropia.

♦ CHEMISTRY

5. Name one metal which can melt with heat of your palm. 

6. Five solutions A, B, C, D and E showed pH 4, 7,1,11 and 9 respectively when tested by a universal indicator. Which solution is :

(1) Strongly acidic (2) strongly alkaline (3) weakly acidic (4) weakly alkaline.

7. State the property utilized in the following:

(a) Graphite in making electrodes.

(b) Electric wires are coated with PVC or a rubber like material.

8. A metal carbonate (X) on reacting with an acid gives a gas which when passed through a solution (Y) gives the carbonate back. On the other hand, a gas (G) that is obtained at anode during electrolysis of brine is passed on dry substance (Y) gives a compound (Z) which is used for disinfecting drinking water. Identify X, Y, G and Z.

♦ BIOLOGY

9. What is the difference between sensory neuron and motor neuron? 

10. Define reflex action. Give an example 

11. How does the plant shoot bends when the plant is placed in a dark room having only one open window?

12. Name the hormone produced by the thyroid gland. Which mineral is necessary for the synthesis of the above hormone? Name the disease suffer from the deficiency of this hormone. Write the functions of the above hormone in the human body.

→ VALUE POINTS 

1. The ability of eye lens to focus nearby and far away objects clearly without strain by adjusting the focal length of eye lens with the help of ciliary muscles is called power of accommodation of human eye.

2. Stars twinkle because they are far away from the earth and they act as point sources of light. The planets in our solar system, much smaller than stars, are closer.

3. 1/f =1/v -1/u
    =1/-30 -1/-∞
    f = - 30cm
    p= 1/f
    =100/-30
    = -3.33D
The type of lens used for correcting the defect is concave lens.

4. Hypermetropia (long-sightedness) is the defect of vision where a person can see far away objects clearly but unable to see near by objects clearly.

Any two Causes

5. Gallium or Cesium 

6. pH=1 - Strongly acidic , pH=11 - Strongly alkaline , pH= 4 -Weakly acidic , pH =9 - Weakly alkaline.

7. 1. It is a good conductor of electricity.

2. Electric wires are made of Cu & Al are good conductors of electricity. In order to insulate, these are kept covered with PVC

8. X- Calcium Carbonate , Y –Calcium hydroxide , G - Chlorine, Z -Bleaching powder. ( Can write formula also )

9. Sensory neuron carry messages from sense organ to the brain or spinal cord 
Motor neuron carry messages from the brain or spinal cord to muscles or glands 

10. Spontaneous involuntary response to a stimulus  Any one example

11. When light comes from one side auxin diffuse towards the shaded side 

Cells grow longer on the side of the shoot away from light

12. Thyroxin 
Iodine

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