If a body is charged by rubbing, its weight:

Which statement is true about both the figures?

1. ‘A’ shows thermocouple effect and ‘B’ shows friction to produce electricity
2. ‘A’ shows thermocouple effect and ‘B’ shows piezoelectric effect to produce electricity
3. ‘A’ shows piezoelectric effect and ‘B’ shows thermocouple effect to produce electricity
4. ‘A’ shows friction and ‘B’ shows thermocouple effect to produce electricity

What is the function of every generator?

1. Changing wind energy into electrical energy
2. Changing heat energy into electrical energy
3. Changing mechanical energy into electrical energy
4. Changing solar energy into electrical energy

Ordinary rubber is an insulator, but the special rubber that is tyres of air crafts are made slightly conducting. Why is this necessary?

1. To decrease the price.
2. To increase the aircrafts stability.
3. To remove the charges generated due to friction.
4. Incomplete information.

What do fuel cells, batteries and solar cells have in common?

1. They all produce electricity
2. They are used to create magnetic field
3. They are all cheap in price
4. They all can be used to power automobiles

When a glass rod is rubbed with silk:

1. Negative charge is produced on silk, but no charge is produced on the glass rod.
2. Equal but opposite charges are produced on both the materials.
3. Equal and similar charges are produced on both the materials.
4. Positive charge is produced on the glass rod  but no charge is produced on the silk.

Which of these is used for the separation of charges to generate electricity?

Which of these is used for the separation of charges to generate electricity?

What process happens in solar cell?

1. Process of creating photons from voltage
2. Process of converting kinetic energy into electricity
3. Process of creating light from electricity
4. Process of converting sunlight into electricity

Magnetism produces electricity in:

1. Generators
2. Incubators
3. Manipulators
4. Piezoelectric crystals

What is the one possible reason that "Conservation of electricity is a good idea".

1. It is often produced by nonrenewable source of energy.
2. Limited amount of power supply is given to each household.
3. Using too much electricity can cause fire.
4. Using too much electricity can cause transformers to break down.

How does a generator create current?

1. By using a magnet.
2. By using a fan.
3. By using energy from the sun.
4. By using heat from the oil.

Piezoelectric effect is when materials produce electric charges when:

1. Voltage is applied
2. Mechanical stress is applied
3. Electric field is applied
4. Magnetic field is applied

An object becomes negatively charged by:

1. Losing electrons
2. Gaining electrons
3. Losing protons
4. Gaining protons

Old turntables and record players used which electrical source to make music? Hint: the needle used to be a crystal.

1. Thermoelectric
2. Piezoelectric
3. Magnetomotive 
4. Chemical reaction

The piezoelectric materials used for converting energy are called_______.

1. Transition devices.
2. Converter.
3. Dielectric.
4. transducer.