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Precautions to be taken while dealing with current - class-IX

Description: precautions to be taken while dealing with current
Number of Questions: 38
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Tags: physics when current flows electric current and circuit electric circuits effects of electric current household circuits electric charge and electric current
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Why one should never touch electrical appliance with wet hand?

physics when current flows precaution with the electrical circuit precautions to be taken while dealing with current electrical safety devices used to protect from shock of electric current

  1. Wet body is bad conductor

  2. Wet body is good conductor

  3. Both of these

  4. None of these

Show answer
Correct Option: B
Explanation:

Never touch any electrical appliance with wet hands. Wet body can act as a good conductor of electricity. In case of any leakage the person with wet hands will get shock.

The effect of current on which the use of a fuse is based is

physics when current flows precaution with the electrical circuit precautions to be taken while dealing with current electrical safety devices used to protect from shock of electric current

  1. Magnetic effect

  2. Chemical effect

  3. Heating effect

  4. Induction effect

Show answer
Correct Option: C
Explanation:

Heating effect of current is used in fuse.

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

physics when current flows precaution with the electrical circuit precautions to be taken while dealing with current electrical safety devices used to protect from shock of electric current

  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

Show answer
Correct Option: D
Explanation:
Some precaution to be taken while using electricity:
1. DON'T plug a bunch of stuff into one outlet or extension cord.
It could damage the electrical system in your house or even cause a fire.
2. DO ask grown-ups to put safety caps on all unused electrical outlets.
Covering outlets will also help save energy by stopping cold drafts.
3. DON’T yank an electrical cord from the wall.
Pulling on a cord can damage the appliance, the plug or the outlet.
4. DO make sure all electric cords are tucked away, neat and tidy.
Pets might chew on electrical cords, and people might trip and fall.
5. DON'T ever climb the fence around an electrical substation.
If a ball or pet gets inside the fence, ask a grown-up to call the electric company - they'll come and get it out for you.
6. DO look up and look out for power lines before you climb a tree.
The electricity can go right through the tree branch - and right through you!
7. DON’T fly a kite near power lines.
The kite and the string may conduct electricity – sending it right through you to the ground.

Identify correct option safety precaution while using electricity

physics when current flows precaution with the electrical circuit precautions to be taken while dealing with current electrical safety devices used to protect from shock of electric current

  1. Don't plug a bunch of stuff into one outlet or extension cord.

  2. Make sure all electric cords are tucked away, neat and tidy.

  3. Don't ever climb the fence around an electrical substation.

  4. All of these

Show answer
Correct Option: D
Explanation:
Some precaution to be taken while using electricity:
1. DON'T plug a bunch of stuff into one outlet or extension cord.
It could damage the electrical system in your house or even cause a fire.
2. DO ask grown-ups to put safety caps on all unused electrical outlets.
Covering outlets will also help save energy by stopping cold drafts.

3. DON’T yank an electrical cord from the wall.
Pulling on a cord can damage the appliance, the plug or the outlet.

4. DO make sure all electric cords are tucked away, neat and tidy.
Pets might chew on electrical cords, and people might trip and fall.

5. DON'T ever climb the fence around an electrical substation.
If a ball or pet gets inside the fence, ask a grown-up to call the electric company - they'll come and get it out for you.

Major dangers while using electricity are/is

physics when current flows precaution with the electrical circuit precautions to be taken while dealing with current electrical safety devices used to protect from shock of electric current

  1. Fire

  2. An electric shock

  3. Both

  4. None

Show answer
Correct Option: C
Explanation:
There are two majors dangers while using electricity.they are 
A) Fire 
B) An electric shock.
A fire is caused due to overheating of line wired (or cable) for various reasons such as break if insulation or short-circuiting, etc to avoid it ,one must use wires (or cables) of current carrying capacity higher than the total current which can flow through the circuit when using all the appliances at the same time. An electric shock may be caused from an appliance due to 
i) Poor insulation of wires,
ii) Touching the appliances with wet hands and 
iii) No earthing of the appliance.
To avoid it, the insulation of wires must be of good quality and it should be checked from time to time particularly when they become old, so that no wire is left naked the appliance should never be operated (or touched) with wet hands and they should always be kept dry. The appliances must have its metallic case earthed the appliances must be provided with a fuse.

+ Solution

Which of the following are safety precautions to be taken while using electricity. Select correct option

physics when current flows precaution with the electrical circuit precautions to be taken while dealing with current electrical safety devices used to protect from shock of electric current

  1. Avoid water at all times when working with electricity

  2. Never use equipment with frayed cords, damaged insulation or broken plugs

  3. Always use insulated tools while working.

  4. All of these

Show answer
Correct Option: D
Explanation:

water can damage the circuits. it can also create a short circuit which may result into serious accidents. If insulation is damaged, then our body may come into direct contact with the electric current, resulting in an electric shock. Insulation is thus compulsory while working with electricity.

Mark the incorrect option

physics when current flows precaution with the electrical circuit precautions to be taken while dealing with current electrical safety devices used to protect from shock of electric current

  1. The appliances must have its metallic case earthed

  2. The appliances must be provided with a fuse

  3. The appliance should always operated(or touched)with wet hands

  4. All

Show answer
Correct Option: C
Explanation:

Touching an appliance with wet hands can cause an electric shock, thus option C is the incorrect statement.

Following are some precaution to be taken while using electricity given as options. Mark most appropriate one.

physics when current flows precaution with the electrical circuit precautions to be taken while dealing with current electrical safety devices used to protect from shock of electric current

  1. Have a grown-up put safety caps on all unused electrical outlets.

  2. Remind your mom or dad to watch out for power lines

  3. Keep electrical stuff far away from water.

  4. All of these

Show answer
Correct Option: D
Explanation:
Some precaution to be taken while using electricity:
1. DON'T plug a bunch of stuff into one outlet or extension cord.
It could damage the electrical system in your house or even cause a fire.
2. DO ask grown-ups to put safety caps on all unused electrical outlets.
Covering outlets will also help save energy by stopping cold drafts.
3. DON’T yank an electrical cord from the wall.
Pulling on a cord can damage the appliance, the plug or the outlet.
4. DO make sure all electric cords are tucked away, neat and tidy.
Pets might chew on electrical cords, and people might trip and fall.
5. DON'T ever climb the fence around an electrical substation.
If a ball or pet gets inside the fence, ask a grown-up to call the electric company - they'll come and get it out for you.
6. DO look up and look out for power lines before you climb a tree.
The electricity can go right through the tree branch - and right through you!
7. DON’T fly a kite near power lines.
The kite and the string may conduct electricity – sending it right through you to the ground.

An electric shock may be caused by

physics when current flows precaution with the electrical circuit precautions to be taken while dealing with current electrical safety devices used to protect from shock of electric current

  1. Poor insulation of wires.

  2. Touching the appliances with wet hands.

  3. No earthing of the appliance.

  4. All

Show answer
Correct Option: D
Explanation:

An electric shock may be caused from an appliance due to 
i) Poor insulation of wires,
ii) Touching the appliances with wet hands and 
iii) No earthing of the appliance.
To avoid it,the insulation of wires must be of good quality and it should be checked from time to time particularly when they become old,so that no wire is left naked the appliance should never be operated(or touched)with wet hands and they should always be kept dry.the appliances must have its metallic case earthed the appliances must be provided with a fuse.

A person can get an electric shock by touching it if the wire has poor insulation of rubber over it.
An electric shock may also be caused by touching the appliance that was either not earthed or touching it with wet hands.

Thus option D is correct.

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

physics when current flows precaution with the electrical circuit precautions to be taken while dealing with current electrical safety devices used to protect from shock of electric current

  1. Treat all electrical devices as if they are live or energized

  2. Disconnect the power source before servicing or repairing electrical equipment.

  3. Use only tools and equipment with non-conducting handles when working on electrical devices.

  4. All of these

Show answer
Correct Option: D
Explanation:

Rules to follow when working with electricity:

  1. Treat all electrical devices as if they are live or energized. You never know.
  2. Disconnect the power source before servicing or repairing electrical equipment. The only way to be sure.
  3. Use only tools and equipment with non-conducting handles when working on electrical devices. Easy to check.

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

physics when current flows precaution with the electrical circuit precautions to be taken while dealing with current electrical safety devices used to protect from shock of electric current

  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

Show answer
Correct Option: D
Explanation:

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. Very logical. NEVER try to remove water or similar from equipment while energized. After all, it’s stupid to do so.
  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.

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

physics when current flows precaution with the electrical circuit precautions to be taken while dealing with current electrical safety devices used to protect from shock of electric current

  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

Show answer
Correct Option: D
Explanation:

Safety precaution to be used while using electricity:

  1. Never use metallic pencils or rulers, or wear rings or metal watchbands when working with electrical equipment. This rule is very easy to forget, especially when you are showing some electrical part pointing with metallic pencil. Always be aware. 
  2. When it is necessary to handle equipment that is plugged in, be sure hands are dry and, when possible, wear non-conductive gloves, protective clothes and shoes with insulated soles. Remember: gloves, clothes and shoes. 
  3. Minimize the use of electrical equipment in cold rooms or other areas where condensation is likely. If equipment must be used in such areas, mount the equipment on a wall or vertical panel.

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

physics when current flows precaution with the electrical circuit precautions to be taken while dealing with current electrical safety devices used to protect from shock of electric current

  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

Show answer
Correct Option: D
Explanation:

Some precaution to be taken while using electricity:

  1. Know the wire code of your country.
  2. Always check all your GFCI’s once a month. A GFCI (Ground Fault Circuit Interrupter) is a RCD (Residual Current Device). They have become very common in modern homes, especially damp areas like the bathroom and kitchen, as they help avoid electrical shock hazards. It is designed to disconnect quickly enough to avoid any injury caused by over current or short circuit faults.
  3. Always use a circuit breaker or fuse with the appropriate current rating.

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

physics when current flows precaution with the electrical circuit precautions to be taken while dealing with current electrical safety devices used to protect from shock of electric current

  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

Show answer
Correct Option: D
Explanation:

Some safety precautions to be taken while using electricity:

  1. Try putting a cap on the live wire while working on circuit panels. The cap acts as an insulation and help in preventing any electric shock.
  2. We should be always careful when removing a capacitor from a circuit.
  3. Working outside with underground cabling can be dangerous. So we should be careful when working with underground cable.

Which of the following is to be used as safety precaution while using electricity.

physics when current flows precaution with the electrical circuit precautions to be taken while dealing with current electrical safety devices used to protect from shock of electric current

  1. Drain capacitors before working near them and keep the short circuit on the terminals during the work to prevent electrical shock.

  2. Never touch another persons equipment or electrical control devices unless instructed to do so.

  3. Enclose all electric contacts and conductors so that no one can accidentally come into contact with them.

  4. All of these

Show answer
Correct Option: D
Explanation:

Safety precaution while using electricity:

  1. Drain capacitors before working near them and keep the short circuit on the terminals during the work to prevent electrical shock. 
  2. Never touch another person’s equipment or electrical control devices unless instructed to do so. Don’t be too smart. Don’t try your luck. 
  3. Enclose all electric contacts and conductors so that no one can accidentally come into contact with them. If applicable do it always, if not be very careful.

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

physics when current flows precaution with the electrical circuit precautions to be taken while dealing with current electrical safety devices used to protect from shock of electric current

  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

Show answer
Correct Option: D
Explanation:

The safety precaution to be taken while using electricity:

  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. Always check that it is de-energized first by using a tester. When an electric tester touches a live or hot wire, the bulb inside the tester lights up showing that an electrical current is flowing through the respective wire. Check all the wires, the outer metallic covering of the service panel and any other hanging wires with an electrical tester before proceeding with your work.
  3. Never use an aluminium or steel ladder if you are working on any receptacle at height in your home. An electrical surge will ground you and the whole electric current will pass through your body. Use a bamboo, wooden or a fiberglass ladder instead.

Fire can be caused by

physics when current flows precaution with the electrical circuit precautions to be taken while dealing with current electrical safety devices used to protect from shock of electric current

  1. Breakage of cables

  2. Overheating of line wires

  3. Poor insulation of wires

  4. All

Show answer
Correct Option: B
Explanation:

There are two major dangers while using electricity. They are 
A) A fire 
B) An electric shock. 
A fire is caused due to overheating of line wired (or cable) for various reasons such as break if insulation or short circuiting,etc to avoid it ,one must use wires (or cables) of current carrying capacity higher than the total current which can flow through the circuit  When using all the appliances at the same time.

What are the possible risk when an electrical appliance is used in wet places?

physics when current flows precaution with the electrical circuit precautions to be taken while dealing with current electrical safety devices used to protect from shock of electric current

  1. The fuse blows

  2. The user gets an electric shock

  3. Fire occurs

  4. Appliance gets over heated

Show answer
Correct Option: B,C
Explanation:

User will get shock as water is good conductor of electricity .When water gets into the appliance, it may get into contact with live wire and conduct the charge out of live wire to user.

It can cause fire ,as water is good conductor of current.It can cause short circuit and very high current can cause heating or fire.

To avoid electric shock:

physics when current flows precaution with the electrical circuit precautions to be taken while dealing with current electrical safety devices used to protect from shock of electric current

  1. The insulation of wires must be of good quality

  2. Insulation should be checked from time to time

  3. The appliances must have its metallic case earthed

  4. All

Show answer
Correct Option: D
Explanation:

To avoid electric shock 

$\rightarrow$ The insulation of wires must be of good quality 
$\rightarrow$ Insulation should be checked from time to time 
$\rightarrow$ The appliances must have its metallic case earthed 

Wires used in homes are usually covered with materials like plastic or rubber. This is done to

physics effects of electric current precaution with the electrical circuit precautions to be taken while dealing with current devices used to protect from shock of electric current

  1. Prevent rusting

  2. Make handling easier

  3. Prevent shocks & short circuits

  4. Make them look beautiful

Show answer
Correct Option: C
Explanation:

Insulators are used in electrical equipment to support and separate electrical conductors without allowing current through themselves.

therefore it prevent us from shocks and short circuits.

State whether given statement is True or False
Earth connection saves the user from electric shocks.

physics effects of electric current precaution with the electrical circuit precautions to be taken while dealing with current devices used to protect from shock of electric current

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

The current takes the path that is having less resistance . Hence lesser the resistance higher the current and higher the resistance lower the current. So in case of shock current passes though you. A normal person have a resistance of about $10\times 10^3\Omega $ and as there is no different path for the current to move hence its passes to ground though you.  

but in case a earth connection the current have almost no resistance path through the ground wire to the ground.
Therefore it helps in saving the user from electric shocks. 

All wires used in electric circuits should be covered with

physics effects of electric current precaution with the electrical circuit precautions to be taken while dealing with current devices used to protect from shock of electric current

  1. a coloured material

  2. an insulating material

  3. a conducting material

  4. none of these

Show answer
Correct Option: B
Explanation:

he most important reason why electrical wires are covered in insulating material is to protect people from electrical shock, and  protection from short circuit.

State whether given statement is True or False
All electrical appliances should be properly earthed.

physics effects of electric current precaution with the electrical circuit precautions to be taken while dealing with current devices used to protect from shock of electric current

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

All electrical appliances should be properly earthed because to prevent us from shock. This statement is true.

State whether given statement is True or False.
We must not touch electric switches with bare hands.

physics effects of electric current precaution with the electrical circuit precautions to be taken while dealing with current devices used to protect from shock of electric current

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

It is not in general sense, but for protection purpose from any kind of defect in the insulator material damage in the electrical switch we must not touch it withh bare hands specially in case our hands are wet.

A person may get a severe electric shock on touching a :

physics effects of electric current precaution with the electrical circuit precautions to be taken while dealing with current devices used to protect from shock of electric current

  1. a neutral wire

  2. a live wire

  3. an earth wire

  4. none of these

Show answer
Correct Option: B
Explanation:

A person may get a severe electric shock on touching the live wire. Because live wires have high potential and current flows through our body (low potential ). Thus we get electric shocks.

Wires used in homes are usually covered with materials like plastic or rubber. The primary reason for doing this is to :

physics effects of electric current precaution with the electrical circuit precautions to be taken while dealing with current devices used to protect from shock of electric current

  1. prevent rusting

  2. make handling easier

  3. prevent shocks & short circuits

  4. make them look beautiful

Show answer
Correct Option: C
Explanation:
Wires used in homes are usually covered with materials like plastic or rubber, because plastic and rubber are bad conductors of electricity and do not allow current to flow. This prevents us from getting a shock due to a  short circuit.

Electricians use rubber gloves while working because

physics electric circuits precaution with the electrical circuit precautions to be taken while dealing with current devices used to protect from shock of electric current

  1. rubber is an insulator

  2. rubber is a good conductor

  3. it is easy to work while wearing gloves

  4. none ofthese

Show answer
Correct Option: A
Explanation:

Electricians use rubber gloves while working because rubber is an insulator and hence prevents them from getting an electric shock.

Find odd man out
Electric cell, Storage cell, Electric geyser, Electric generator.
physics effects of electric current precaution with the electrical circuit precautions to be taken while dealing with current devices used to protect from shock of electric current

  1. Electric Cell

  2. Storage Cell

  3. Electric geyser

  4. Electric Generator

Show answer
Correct Option: C
Explanation:

Electric geyser is an appliance, rest all are sources of electricity.

Wires used for electric supply go are generally made up of:

physics household circuits precaution with the electrical circuit precautions to be taken while dealing with current devices used to protect from shock of electric current

  1. silver

  2. aluminium

  3. copper

  4. both b and c

Show answer
Correct Option: D
Explanation:

Electric is generated at power station. It is brought to one house by two thick copper wires or aluminium wires fixed once fall electric poles

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

physics electric circuits precaution with the electrical circuit precautions to be taken while dealing with current devices used to protect from shock of electric current

  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

Show answer
Correct Option: A
Explanation:

An electric fuse is connected in parallel. This is not a safety measure. Fuse is always connected in series.

Alternating current produced in india has a frequency of _______.

physics effects of electric current precaution with the electrical circuit precautions to be taken while dealing with current devices used to protect from shock of electric current

  1. 220 Hz

  2. 120 Hz

  3. 15 Hz

  4. 50 Hz

Show answer
Correct Option: D
Explanation:

Alternating current produced in india has a frequency of 50 Hz. i.e. the coil is rotated at the role of 50 revolution per second.

High tension wires has

physics household circuits precaution with the electrical circuit precautions to be taken while dealing with current devices used to protect from shock of electric current

  1. high resistance.

  2. low resistance.

  3. high young's modulus.

  4. low young's modulus.

Show answer
Correct Option: B
Explanation:

High tension wire is made by twisting together a number of thin wires insulated from each other so as to provide large surface area. It helps to radiate more heat and prevents burning of wire.

In domestic electrical circuit, switches are used in

physics electric circuits precaution with the electrical circuit precautions to be taken while dealing with current devices used to protect from shock of electric current

  1. Neutral wire

  2. Earth wire

  3. Live wire

  4. All of these

Show answer
Correct Option: C
Explanation:

Switches are connected in live wire so that when the switch is in off position, no current flows through circuit. As a result there will not be any danger of electrical shock.

A high tension wire has a _____ resistance. Fill in the blank.

physics household circuits precaution with the electrical circuit precautions to be taken while dealing with current devices used to protect from shock of electric current

  1. Low

  2. High

  3. Equal

  4. None

Show answer
Correct Option: A
Explanation:

A high tension wire has a low resistance and large surface area. Instead of taking a single thick wire of low resistance, it is made by twisted together a number of thin wires insulated from each other so as tat it can radiate the head provided.

A bulb of 40W is producing a light of wavelength 620 nm with 80% of eficiency then no of photons emitted by the bulb in 20 sec are 

physics household circuits precaution with the electrical circuit precautions to be taken while dealing with current devices used to protect from shock of electric current

  1. $2 \times (10) ^ {18}$

  2. $10 \times (10) ^ {18}$

  3. $10 \times (10) ^ {21}$

  4. $2 \times (10) ^ {20}$

Show answer
Correct Option: D
Explanation:

Energy of photon emitted by a bulb,

$E=\dfrac{80}{100}\times 40\times 20=640$
Wavelength of light, $\lambda=620nm$
Energy of photons $E'=\dfrac{hc}{\lambda}$
$=3.2\times 10^{-19}J$
$\therefore$ No of photons emitted , $n=\dfrac E{E'}$
$=\dfrac{640}{32\times 10^{-19}}$
$=2\times 10^{20}$

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