P-2 Towards Green Energy — Science STD 10 — Question

Identify the law shown in Fig. 1.7 and state the three respective laws. (Practice Activity Sheet –3)

Draw a neat labelled diagram of Hope’s apparatus. Explain how this apparatus can be used to demonstrate anomalous behaviour of water. Draw a graph of temperature of water against time.

Write the names and symbols of two very reactive metals belonging to group 1 of the periodic table. Explain by drawing electronic structure, how either one of the two metals reacts with a halogen. With which name is the bond formed between these elements known and what is the class of the compound so formed known? State any four physical properties of such compounds.

Write short notes on: Hydraulic separation method

Some symbols are given below. Explain those symbols. Which disasters may occur if those symbols are ignored?

Which element has:

1. Two shells, both of which are completely filled with electrons?
2. The electronic configuration 2, 8, 2?
3. A total of three shells, with four electrons in its valence shell?
4. A total of two shells, with three electrons in its valence shell?
5. Twice as many electrons in its second shell as its first shell?

A potted plant is growing in a transparent glass jar. In this plant, X and Y are the two growing parts having a lot of meristematic tissue. It is observed that the part X of this plant exhibits positive geotropism but negative phototropism. On the other hand, part Y of this plant exhibits negative geotropism but positive phototropism.

1. Name the part X of plant.
2. Name the part Y of plant.
3. Which part of the plant, X or Y, will exhibit positive hydrotropism?
4. Which part of the plant, X or Y, can have tendrils on it?
5. Which phytohormone causes the part X to exhibit negative phototropism?

Questions based on the charts.
Complete the flow chart:

Give scientific Reason :
Inert gases exist in the form of free atoms.

A woman uses pills A as a method of birth control (or preventing pregnancy). The pills A stop the ovaries from releasing ovum into oviducts. Another woman uses pills B as a method of birth control. The pills B kill the sperms and prevent pregnancy.

1. What do the pills A contain?
2. What is the common name of pills A?
3. What do the pills B contain?
4. What is the common name of pills B?
5. What is the general name of these methods of birth control?