X Phy. & Chem.

CLASS X PHYSICS HOLIDAYS HOMEWORK 1. Paste a photocopy of an electricity bill and calculate the energy consumption shown in it. 2. Segregate the appliances used in your house under the heading of 15A and 5A current ratings and write in a tabular form. 3. Indian Government had signed a treaty with USA regarding nuclear energy. Make list of 5 points on how this treaty has benefited India. 4. a. List the alternative sources of energy used in our villages presently. Take one example of a village from our neighboring area. b. What difference did you observe in rural and urban areas in context of sources of energy used. 5. List 5 natural phenomenon (with pictures) taking place in our surroundings due to the atmospheric refraction, scattering and dispersion. CHEMISTRY 1. Prepare a power point presentation on the topic “Types of Chemical Reactions.” i)The presentation is to be made by a group of three students. ii The presentation should be deposited in the CD alognwiht the names and role No. of the students 2. Perform this activity in your kitchen. Take a container and mix baking soda and vinegar. Observe the chemical reaction carefully. i)Write proper observation and result ii) Write the corresponding equation and identify type. iii) Write the inference drawn from the above activity. 3.Buy pH paper from the nearby chemist / chemicals shop and test

the pH values of solutions given below in the tables. Record your observations. What is the nature (acids/ bases) of each substance on the basic of your observation? Also paste the corresponding pH strip S Solution .No. 1

Saliva (before meal)

2

Saliva (after meal)

3

Lemon Juice

4

Colourless aerated drink

5

Carrot juice

6

Coffee

7

Tomato juice

8

Vinegar

9

Baking soda

10

Tap water

Colour of pH paper

Approx. pH Nature of substance

Refer to the pH scale and pH chart given in the book 4 .Write 50 chemical equations. You can find these chemical equations from various sources like text/book / reference book/Internet, etc. i) Write the names of each of the reactant and product underneath the equation. ii)

Balance each of the chemical equations.

Iii)

Identify the type of reaction in each.