Class 6 Science Chapter 9 MCQ

In an electric bulb, it’s thin filament glows and gives off light and heat which is made of tungsten. Tungsten, or wolfram (w), is a rare metal found naturally on Earth almost exclusively combined with other elements in chemical compounds rather than alone. It was identified as a new element in 1781 and first isolated as a metal in 1783.

Filament of a torch bulb is a thin wire which gives off light. It is fixed to two thicker wires which provides support to it

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.

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

When all the chemicals are in electric cells are used up, the electric cell stops producing electricity.

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.

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.

An electric circuit is a path along which electricity can flow. The electric circuit in which there is no gap in the connection between the terminals of the cell wires and bulb etc., is called a complete circuit and closed circuit.

In an electric bulb, it’s thin “filament glows” and gives off light and heat which is made of tungsten. Tungsten, or wolfram (w), is a rare metal found naturally on Earth almost exclusively combined with other elements in chemical compounds rather than alone. It was identified as a new element in 1781 and first isolated as a metal in 1783.

In an electric bulb, it’s thin filament glows and gives off “light and heat” which is made of tungsten. Tungsten, or wolfram (w), is a rare metal found naturally on earth.

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.

Electricity does not flow through an open circuit. Electricity always flow in a closed circuit.

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.

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].

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

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

Here, all the statements may be the as possible reasons. Hence, your answer will be option [D].