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Write the names of the following functional groups:
→- $-\text{CHO}$
- $-\text{OH}$
- $-\text{COOH}$
- $-\text{X}$
| Column I | Column II |
| (1) Copper and zinc | (a) Stainless steel |
| (2) Copper and tin | (b) Zinc amalgam |
| (3) Iron, nickel and chromium | (c) Bronze |
| (4) Mercury and zinc | (d) Brass |
| (e) Steel |
Conversion of ethanol to ethanoic acid an oxidation reaction
The electrical resistivities of three materials P, Q and R are given below:$\begin{matrix}\text{P}&2.3\times10^{3}\Omega\text{ m}\\\text{Q}&2.63\times10^{-8}\Omega\text{ m}\\\text{R}&1.0\times10^{15}\Omega\text{ m}\end{matrix}$
Which material will you use for making:
→Which material will you use for making:
- Electric wires.
- Handle for soldering iron, and
- Solar cells?
A person got his eyes tested by an optician. The prescription for the spectacle lenses to be made reads:
Left eye: +2.50D, Right eye: +2.00D
Left eye: +2.50D, Right eye: +2.00D
- State whether these lenses are thicker in the middle or at the edges.
- Which lens bends the light rays more strongly?
- State whether these spectacle lenses will converge light rays or diverge light rays.
What are the environmental consequences of the increasing demand for energy?
Make a table based on forms of energy and corresponding devices:
| Forms of Energy | Devices | |
| i. | Electric | ________________ |
| ii. | Mechanical | Sewing machine, Bicycle |
| iii. | Thermal | ________________ |
| iv. | ________________ | Solar cooker, Solar heater |
Draw a neat labelled diagram. : Dispersion of light
(i) What do you observe in the following pictures?
(ii) Which effects of electric current do you find?
(ii) Which effects of electric current do you find?
Open chain hydrocarbons and closed chain hydrocarbons.