0

Electricity and Magnetism

Attempted 0/23 Correct 0 Score 0

Which of these does not have an electric charge?

  1. Electron

  2. Neutron

  3. Proton

  4. Insulator

  5. None of these


Correct Option: B
Explanation:

Neutrons have no electric charge

An object is said to be electrically neutral if the amount of positive and negative charge possessed by it is not

  1. negative

  2. positive

  3. equal

  4. unequal

  5. all of these


Correct Option: C
Explanation:

An atom has equal number of protons and electrons, it contains equal amount of positive and negative charge and becomes electrically neutral.

Which of the following causes current to flow in a wire?

  1. Electric field

  2. Electric circuit

  3. Electric resistance

  4. Electric domains

  5. Magnetic domains


Correct Option: B
Explanation:

A closed electrical path in which electric charge can flow is defined as an electric circuit.

Which of the following are the materials in which electric charges do not move easily?

  1. Insulators

  2. Conductors

  3. Circuits

  4. Metals

  5. None of these


Correct Option: A
Explanation:

In insulators are electrons held tightly by atoms due to which electrons are unable move easily.

__________ can prevent damage caused to building by lightning strikes.

  1. Insulating

  2. Conducting

  3. Grounding

  4. Charging

  5. None of these


Correct Option: C
Explanation:

When lightning strikes a lightning rod, the electric charges in the lighting flash flow through the connecting wire into the ground

Increasing the voltage in a circuit increases which of the following in the circuit?

  1. The energy transferred to the circuit

  2. Static charge

  3. Number of charges

  4. Electric resistance

  5. None of these


Correct Option: D
Explanation:

Increasing the resistance in the circuit increases the number of collision that occurs every second as electrons flow.

Which of the following has only one path for current to follow?

  1. A parallel circuit

  2. An electric circuit

  3. A magnetic pole

  4. A series circuit

  5. All of these


Correct Option: D
Explanation:

In a series circuit, devices are connected so these is only one closed path for current to flow if any part of this path is broken, current will no larger flow in the circuit.

What surrounds an electric current?

  1. Magnetic field

  2. Electromagnet

  3. Charge

  4. Electric circuit

  5. None of these


Correct Option: D
Explanation:

Not only is a current carrying wire surrounded by a magnetic field, but so as any electric charge in motion.

When a portable radio is playing, the current in the radio is 0.3A, what is the voltage supplied by the radio battery?

  1. 12V

  2. 9V

  3. 6V

  4. 15V

  5. None of these


Correct Option: B
Explanation:

The voltage supplied by the radio is 9.0V

The measure of how difficult it is for electrons to flow in an object is called the _______.

  1. Electric circuit

  2. Electric resistance

  3. Magnetic domains

  4. Electric field

  5. None of these


Correct Option: B
Explanation:

Electric resistance results from the collision between the electrons flowing in a current and the atoms and other charges in the circuit.

Which of the following is an example of electric discharge?

  1. Spark between your hand and door knob

  2. Articles of clothing sticking together

  3. Trees

  4. Rubbing your cat's fur with a balloon


Correct Option: A
Explanation:

When use walk across carpet and touch a metal door knob, we might feel an electric shock or a spark. The spark is an example of electric discharge.

Which of the following generates an electric current when rotated?

  1. A battery

  2. A magnet

  3. A domain

  4. Wire loop

  5. None of these


Correct Option: D
Explanation:

If a loop of wire is rotated within a magnetic field, the motion of the wire loop with respect to the magnetic field produces an electrical field in the wire.

Which of the following is true about a permanent magnet?

  1. It contains an iron core

  2. Preservation

  3. It contains current carrying wise

  4. Its domains are lined up

  5. None of these


Correct Option: D
Explanation:

Most of the domains in a permanent magnet are oriented along a single direction.

Which of the following energy conversions occur inside a battery?

  1. Electrical to Chemical

  2. Thermal to Electrical

  3. Thermal to Chemical

  4. Chemical to Electrical

  5. None of these


Correct Option: D
Explanation:

The chemical reactions cause the negative terminal to become negatively charged and the positive terminal to become positively charged. The negative and positive charges on the battery terminals produce the electric field in the circuit that causes electrons to flow.

Which of the following does not describe the magnetic field force between two magnets?

  1. The like pole attract

  2. The like pole repel

  3. It decreases as the magnets move apart

  4. The unlike pole attract

  5. None of these


Correct Option: A
Explanation:

The magnetic forces between two magnetic poles are attractive for unlike poles and repulsive for like poles.

Which of the following represents a group of atoms that have their own magnetic poles pointing in the same direction?

  1. Electric current

  2. Electromagnet

  3. Magnetic domain

  4. Voltage

  5. None of these


Correct Option: C
Explanation:

A single magnetic domain may contain trillions of atoms, but it is still too small to be seen with our naked eyes.

Which of the following is made of a current carrying wire wrapped around an iron core?

  1. Electric current

  2. Insulator

  3. Conductor

  4. Electromagnet

  5. None of these


Correct Option: D
Explanation:

A current carrying wise wrapped around an iron core is an electromagnet.

Which of the following is not a non-magnetic substance?

  1. Glass

  2. Wood

  3. China wane

  4. Nickel

  5. None of these


Correct Option: D
Explanation:

Nickel is a magnetic substance.

Which of the following items would get attracted towards a magnet?

  1. Common pins

  2. Silver spoon

  3. Glass bangle

  4. Comb

  5. None of these


Correct Option: A

What happens when a South pole of a magnet is brought near the North pole of a freely suspended magnetic needle?

  1. Repels

  2. Rotates

  3. Attracts

  4. All of these

  5. None of these


Correct Option: C
Explanation:

Opposite pole attract each other.

Which of the following is the measure of the amount of electrical energy transferred by an electric charge as it moves from one point to another in an electric circuit?

  1. Current

  2. Charge

  3. Electric circuit

  4. Voltage

  5. None of these


Correct Option: D
Explanation:

The voltage between any two points in the circuit increases when electric field in circuit increases. The SI unit for voltage is volt, & has the symbol V.

An electric bell is an example of

  1. bar magnet

  2. cylindrical magnet

  3. electromagnet

  4. horseshoe magnet

  5. none of these


Correct Option: C
Explanation:

Electromagnet is right as when the bell switch is put ON current flows through the magnet and makes it active electromagnet.

The South Pole of a freely suspended magnet points towards

  1. geographical north

  2. geographical south

  3. geographical east

  4. geographical west

  5. all of these


Correct Option: B
- Hide questions