Electricity — Science STD 10 — Question

What is the scientific name of sensitive plant?

A simple circuit consists of a resistor, a battery, and connecting wires. How must a voltmeter be connected to a resistor in order to read the potential difference across it?

Name the biomass which is still widely used as a source of heat energy in many households of our country.

Which effect of current is utilised in the working of an electric fuse?

In the following food chain, 20,000 J of energy was available to the plants. How much energy would be available to man in this chain?
Plants → Sheep → Man.

Why did United Nations act to control the production of chlorofluoro-carbons (CFCs) used in refrigerators?

Name the functional group which always occurs in the middle of a carbon chain.

How does the number of valence electrons vary on moving from left to right:

1. In the first period of the periodic table?
2. In the second period of the periodic table?

Flowing water can rotate a turbine. Which type of energy is used up by the turbine?