Physics
Grade-9
Easy
Question
What method of static charging is shown in this picture:

- Polarization
- Friction
- Induction
- Conduction
Hint:
Friction refers to the method of static charging exhibited by sliding or rolling an object over another.
The correct answer is: Friction
The static charge generated when an object is sliding over another is called friction.
- The method of static charging exhibited by sliding or rolling an object over another is called friction.
- Friction is generated when an object is rubbed over another.
- The force created when an object is sliding over another is called frictional force.
Related Questions to study
Physics
An object becomes positively charged by:
- Losing electrons
- Gaining electrons
- Losing protons
- Gaining protons
An object becomes positively charged by:
PhysicsGrade-9
- Losing electrons
- Gaining electrons
- Losing protons
- Gaining protons
Physics
Certain materials produce electricity when struck by light. They are called as ________.
- Photovoltaic
- Magnetomotive
- Electrolytic
- Chemically active
Certain materials produce electricity when struck by light. They are called as ________.
PhysicsGrade-9
- Photovoltaic
- Magnetomotive
- Electrolytic
- Chemically active
Physics
If a body is charged by rubbing, its weight:
- Increases
- Decreases
- Can increase or decrease
- Cannot say
If a body is charged by rubbing, its weight:
PhysicsGrade-9
- Increases
- Decreases
- Can increase or decrease
- Cannot say
Physics
Which statement is true about both the figures?

- ‘A’ shows thermocouple effect and ‘B’ shows friction to produce electricity
- ‘A’ shows thermocouple effect and ‘B’ shows piezoelectric effect to produce electricity
- ‘A’ shows piezoelectric effect and ‘B’ shows thermocouple effect to produce electricity
- ‘A’ shows friction and ‘B’ shows thermocouple effect to produce electricity
Which statement is true about both the figures?

PhysicsGrade-9
- ‘A’ shows thermocouple effect and ‘B’ shows friction to produce electricity
- ‘A’ shows thermocouple effect and ‘B’ shows piezoelectric effect to produce electricity
- ‘A’ shows piezoelectric effect and ‘B’ shows thermocouple effect to produce electricity
- ‘A’ shows friction and ‘B’ shows thermocouple effect to produce electricity
Physics
What is the function of every generator?
- Changing wind energy into electrical energy
- Changing heat energy into electrical energy
- Changing mechanical energy into electrical energy
- Changing solar energy into electrical energy
What is the function of every generator?
PhysicsGrade-9
- Changing wind energy into electrical energy
- Changing heat energy into electrical energy
- Changing mechanical energy into electrical energy
- Changing solar energy into electrical energy
Physics
Ordinary rubber is an insulator, but the special rubber that is tyres of air crafts are made slightly conducting. Why is this necessary?
- To decrease the price.
- To increase the aircrafts stability.
- To remove the charges generated due to friction.
- Incomplete information.
Ordinary rubber is an insulator, but the special rubber that is tyres of air crafts are made slightly conducting. Why is this necessary?
PhysicsGrade-9
- To decrease the price.
- To increase the aircrafts stability.
- To remove the charges generated due to friction.
- Incomplete information.
Physics
What do fuel cells, batteries and solar cells have in common?
- They all produce electricity
- They are used to create magnetic field
- They are all cheap in price
- They all can be used to power automobiles
What do fuel cells, batteries and solar cells have in common?
PhysicsGrade-9
- They all produce electricity
- They are used to create magnetic field
- They are all cheap in price
- They all can be used to power automobiles
Physics
When a glass rod is rubbed with silk:
- Negative charge is produced on silk, but no charge is produced on the glass rod.
- Equal but opposite charges are produced on both the materials.
- Equal and similar charges are produced on both the materials.
- Positive charge is produced on the glass rod but no charge is produced on the silk.
When a glass rod is rubbed with silk:
PhysicsGrade-9
- Negative charge is produced on silk, but no charge is produced on the glass rod.
- Equal but opposite charges are produced on both the materials.
- Equal and similar charges are produced on both the materials.
- Positive charge is produced on the glass rod but no charge is produced on the silk.
Physics
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?
PhysicsGrade-9
Physics
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?
PhysicsGrade-9
Physics
What process happens in solar cell?
- Process of creating photons from voltage
- Process of converting kinetic energy into electricity
- Process of creating light from electricity
- Process of converting sunlight into electricity
What process happens in solar cell?
PhysicsGrade-9
- Process of creating photons from voltage
- Process of converting kinetic energy into electricity
- Process of creating light from electricity
- Process of converting sunlight into electricity
Physics
Magnetism produces electricity in:
- Generators
- Incubators
- Manipulators
- Piezoelectric crystals
Magnetism produces electricity in:
PhysicsGrade-9
- Generators
- Incubators
- Manipulators
- Piezoelectric crystals
Physics
What is the one possible reason that "Conservation of electricity is a good idea".
- It is often produced by nonrenewable source of energy.
- Limited amount of power supply is given to each household.
- Using too much electricity can cause fire.
- Using too much electricity can cause transformers to break down.
What is the one possible reason that "Conservation of electricity is a good idea".
PhysicsGrade-9
- It is often produced by nonrenewable source of energy.
- Limited amount of power supply is given to each household.
- Using too much electricity can cause fire.
- Using too much electricity can cause transformers to break down.
Physics
How does a generator create current?
- By using a magnet.
- By using a fan.
- By using energy from the sun.
- By using heat from the oil.
How does a generator create current?
PhysicsGrade-9
- By using a magnet.
- By using a fan.
- By using energy from the sun.
- By using heat from the oil.
Physics
Piezoelectric effect is when materials produce electric charges when:
- Voltage is applied
- Mechanical stress is applied
- Electric field is applied
- Magnetic field is applied
Piezoelectric effect is when materials produce electric charges when:
PhysicsGrade-9
- Voltage is applied
- Mechanical stress is applied
- Electric field is applied
- Magnetic field is applied