Understanding Static Electricity Quiz

What happens when you rub a balloon on your hair?

• The hair sticks to the rubber balloon because of friction.

• The balloon becomes negatively charged, and your hair becomes positively charged.

• Both the balloon and your hair become positively charged.

• Both the balloon and your hair become negatively charged.

Answer explanation

When you rub a balloon on your hair, electrons transfer from your hair to the balloon. This makes the balloon negatively charged and your hair positively charged, leading to attraction between them.

Which of the following materials is a good conductor of electricity?

• Rubber

• Glass

• Copper

• Plastic

Answer explanation

Copper is a metal known for its excellent electrical conductivity, making it a good conductor of electricity. In contrast, rubber, glass, and plastic are insulators and do not conduct electricity well.

What is the main difference between conductors and insulators?

• Conductors allow electricity to flow through them easily, while insulators do not.

• Insulators allow electricity to flow through them easily, while conductors do not.

• Both conductors and insulators allow electricity to flow through them easily.

• Neither conductors nor insulators allow electricity to flow through them easily.

Answer explanation

The main difference is that conductors allow electricity to flow through them easily, while insulators resist the flow of electricity. This distinction is crucial in understanding how electrical systems function.

What type of force is experienced between two objects with opposite charges?

• Repulsive force

• Attractive force

• Gravitational force

• Magnetic force

Answer explanation

Objects with opposite charges experience an attractive force due to the electromagnetic interaction. This force pulls the two charged objects together, unlike like charges, which repel each other.

Which of the following is an application of static electricity?

• Electric motors

• Lightning rods

• Photocopiers

• Solar panels

Answer explanation

Photocopiers use static electricity to attract toner to paper, making them a clear application of this phenomenon. Other options like electric motors and solar panels rely on different principles.

Why is it important to take safety precautions when dealing with static electricity?

• Static electricity can cause electric shocks.

• Static electricity can cause fires.

• Static electricity can damage electronic equipment.

• All of the above.

Answer explanation

Taking safety precautions with static electricity is crucial because it can lead to electric shocks, cause fires, and damage sensitive electronic equipment. Therefore, all of the above reasons highlight the importance of safety measures.

Which of the following is a safety precaution to prevent static electricity build-up?

• Wearing rubber-soled shoes

• Using a humidifier

• Wearing woollen clothing

• Using metal combs

Answer explanation

Using a humidifier adds moisture to the air, reducing static electricity build-up. In contrast, rubber-soled shoes and woollen clothing can increase static, while metal combs can generate it.

What happens when two objects with the same charge are brought close to each other?

• They attract each other.

• They repel each other.

• They have no effect on each other.

• They neutralise each other.

Answer explanation

When two objects have the same charge, they repel each other due to the electrostatic force. This is a fundamental principle of electromagnetism, where like charges push away from each other.

Which of the following is NOT a common use of static electricity?

• Spray painting

• Air purification

• Electric heaters

• Inkjet printing

Answer explanation

Electric heaters primarily use resistive heating, not static electricity. In contrast, spray painting, air purification, and inkjet printing utilize static electricity for their processes.

What is the unit of electric charge?

• Ampere

• Volt

• Coulomb

• Ohm

Answer explanation

The unit of electric charge is the Coulomb, which quantifies the amount of charge. Ampere measures current, Volt measures electric potential, and Ohm measures resistance, making Coulomb the correct choice.