Precautions to Be Taken While Using Electricity

Q.

What is the working principle of an electrical fuse?

1. Ohm’s law

2. Faraday’s law

3. Joule’s law of heating

4. Coulomb’s law

Q.

What is the importance of live wire?

Q.

List the common electrical hazards that can happen in the domestic circuits.

Q.

What is the colour code for the insulation on the earth wire?

Q. How does use of a fuse wire protect electrical appliances?

Q.

Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpours? Explain.

Q. What safety precaution should be taken while using electricity?

1. Wires should be covered with insulator
2. All electrical appliances must be properly earned
3. Electric circuit should have a fuse
4. All of these

Q.

_______ wire is used to complete the circuit at home.

Q. Why one should never touch electrical appliance with wet hand?

1. Wet body is bad conductor
2. Wet body is good conductor
3. Both of these
4. None of these

Q. Why is it not advisable to handle domestic electrical circuit with wet hands?

Q. Which of the following are correct safety precautions to be taken while using electricity?

1. Don't yank an electrical cord from the wall.
2. Fly your kite far away from power lines or substations.
3. Do look up and look out for power lines before you climb a tree.
4. All of these

Q. Electricians use rubber gloves while working because

1. rubber is an insulator
2. rubber is a good conductor
3. it is easy to work while wearing gloves
4. none ofthese

Q. Below are some safety precautions to be taken while using electricity. Select most appropriate option.

1. Working outside with underground cabling can be dangerous
2. Always put a cap on the hot/live wire while working on an electric board or service panel
3. Take care while removing a capacitor from a circuit
4. All of these

Q. What are the various electric hazards?

Q. In household circuit, fuse is connected in

1. In series
2. In parallel
3. Both (A) and (B)
4. None of these

Q.

20 ) _________ is used as a fuse wire in thermite welding.

Q. Is it safe for an electrician to carry out electrical repairs outdoors during heavy downpour ? Explain

Q. What two precautions should be taken to avoid the overloading of domestic electric circuits?

Q. Normally we use water to extinguish fire. If the fire is sparked by an electrical short circuit, we should not use water. Why is it so ?

Q. Which of the following are safety precaution to be taken while using electricity. Select correct answer.

1. Always use appropriate insulated rubber gloves and goggles while working on any branch circuit or any other electrical circuit.
2. Never try repairing energized equipment
3. Never use an aluminium or steel ladder if you are working on any receptacle at height in your home
4. All of these

Q. Mark the appropriate answer(options includes safety precautions to be used while using electricity)

1. If water or a chemical is spilled onto equipment, shut off power at the main switch or circuit breaker and unplug the equipment.
2. Equipment producing a tingle should be disconnected and reported promptly for repair.
3. Do not rely on grounding to mask a defective circuit nor attempt to correct a fault by insertion of another fuse or breaker, particularly one of larger capacity
4. All of these

Q. What precautions should be taken during the use of electricity?
(Write any six points).

Q. An electric shock may be caused by

1. Poor insulation of wires.
2. Touching the appliances with wet hands.
3. No earthing of the appliance.
4. All

Q.

Which one of the following materials cannot be used as a lightning rod?

1. Wood

2. Iron

3. Copper

4. Aluminium

Q. The earth wire is used to protect an appliance from leakage current.

1. False
2. True

Q. Which of the following is not a safety measure commonly used in electric circuits.

1. An electric fuse is connected in parallel
2. Proper earthing of all electric circuit is done
3. Fuse protects the circuit from overloading
4. All

Q. Options contains safety precaution to be used while using electricity. Mark the appropriate one.

1. Never use metallic pencils or rulers, or wear rings or metal watchbands when working with electrical equipment
2. When it is necessary to handle equipment that is plugged in, be sure hands are dry and, when possible, wear nonconductive gloves, protective clothes and shoes with insulated soles.
3. Minimize the use of electrical equipment in cold rooms or other areas where condensation is likely.
4. All of these

Q. a) Mention the lines to which the heating coil of an electric iron is connected.
b) Explain how a three pin plug ensures safety when it is used with an electric iron.

Q. Which of the following are safety precaution to be taken while using electricity. Mark correct answer

1. Know the wire code of your country.
2. Always check all your GFCIs once a month
3. Always use a circuit breaker or fuse with the appropriate current rating
4. All of these

Q. Earth and neutral wire are for same purpose.

1. False
2. True