Class 6 Science Chapter 9 MCQ

A switch cannot be a source of electric current in the circuit. Electric cell is a source of electricity in the circuit. Other options are the functions of a switch.

In an electric bulb, it’s thin filament glows and gives off light and heat.

Those material which do not allow electric current to pass through them are called insulators. The outer covering of electric wires is made of plastic because plastic is an insulator. Plastic covering does not allow electric current to pass through it. Insulators are used for safety and protect us from getting electrical shocks.

Since, a steel spoon is a conductor of electricity therefore, current will pass through it. So, Paheli can use a steel spoon to complete the circuit.

Actually, insulators are non-conductors of electricity. Mica, rubber, plastics (like polythene, bakelite, PVC), ceramics, asbestos, glass, cotton, wax, thermocol etc., are the examples of insulators.

We know that ordinary electric cells cannot be recharged. The electric cells and batteries used in cars, cameras and mobile phones etc., can be recharge again and again for many years. Rechargeable batteries have some special chemicals after using they can be restored energy again. It passes a suitable current in the opposite direction.

When electricity or electric current from the cell passes through the filament of the bulb, the filament gets heated too much. The “heating effect produced by electricity” from the cell which makes a torch bulb work and produce light.

Here, all the statements are correct. Hence, your answer will be option [D].

A non-metal called carbon in the form of graphite is also a conductor of electricity. Rest of all are insulators.

Those materials which allow electric current to pass through them are called conductors. All the metals are conductors of electricity. Silver metal is a best conductor of electricity. Copper, aluminium, brass metals are also good conductors. And also a non-metal called carbon (in the form of graphite) is also a conductor of electricity.

It is the filament of the bulb which glows when electricity from a cell is passed through it.

Rubber, plastic and ceramics are often used to protect us from the dangerous of electricity because they are good insulators. Electrician wear rubber gloves and hand gloves while handling naked electric wires because rubber is a good insulator and protects them for electric shocks.

when electricity or electric current from the cell passes through the filament of the bulb, the filament gets heated too much.

Here, all the statements are correct. Hence, your answer will be option [D].

Here, all the statements are correct. Hence, your answer will be option [D].

If we make a circuit using cotton threads or jute strings then the bulb will not glow. This is because the cotton threads or jute strings are non-conductors of electricity i.e. insulators. So, cotton thread or jute string cannot conduct or carry electricity through them.

We get electricity or electric current from a cell or battery. An electric cell is a device which produces a small amount of electricity. Thus, electric cell is a source of electricity. Cell and batteries are available in the market in different shapes and sizes depending on their use.

There are some electrical appliances which need small amount of energy or electric (as battery or cell) to run. Such as torch, radio set, mobile phone, hair trimmer, calculator, wrist watch and so many. Television, refrigerator, washing machines, drilling machines, hair dryer, table fan, room heater, mixer and grinder etc. runs in domestic electricity which is 220 volts.

There is only energy which name is electrical energy or current which is converted into to mechanical energy, sound energy, heat energy and light energy very easily. As a example, when we turn on the switch of any machines (where electrical energy convert to mechanical energy), when we press the door bell (where electrical energy convert to sound energy), when we do switched “on” for electric bulb, it starts giving light and filament gets heated too (where electrical energy convert to heat energy and light energy).

The positive terminal of one cell is always kept in contact with the negative terminal of the different cell.

Here, all the statements are incorrect. Hence, your answer will be option [D]. In option [A]: A non-metal called carbon in the form of graphite is also a conductor of electricity. In option [B]: The human body is also conductor of electricity but in a small extent. In option [C]: Distilled water do not conduct electricity because it has no impurities.

Here, all the statements are incorrect. Hence, your answer will be option [D].

The human body does not conduct electricity as good as metal but the human body conducts electricity to a small extent. A person gets electric shock on touching uncovered electric wire carrying current because some electric current passes through his body. As example, electricians are also human beings, so they wear rubber gloves and hand gloves while handling naked electrical wires because rubber is a good insulator and protects them for from electric socks.

Here, all the statements are correct. Hence, your answer will be option [D].

The electric cell is a cylindrical device having a small metal cap on one side and a metal disc on the other side. The electric cell has two terminals: a positive terminal and a negative terminal. The metal cap is positive terminal of the electric cell whereas metal disc is the negative terminal of the electric cell.