Science 1 Marks Question

Induced magnetic field will be in the form of concentric circles in the plane of paper.

Air is not filled in electric bulbs because on lighting, the filament of the bulb becomes hot and this heat will result in burning in presence of air.

A compartment that holds two or more cells together to form a battery is called a cell holder.

When electric current flows through a conductor, a part of electrical energy get converted into heat energy due resistance offered to electron.

The working of electric generator is based on the principle of electromagnetic induction. The Important parts of electric generator are armature, slip rings, brushes and field magnets.

A closed path formed by the interconnection of electrical components through which electric current flows is called an electrical circuit.

If the filament of the bulb is broken, the circuit will not be complete. So, the bulb will not glow.

It is overloaded by connecting too many devices to it. When too many devices get connected, then a circuit is said to be overloaded.

Longer line in the symbol for cell representsits positive terminal.

These switches turn off automatically when there is an overload or a short circuit.

The electric room heater, electric roti maker, electric iron, toaster, hair dryer, electric stove, immersion water heater, food warmer, electric coffee maker, electric rice cooker and geyser.

The combination of two or more cells is called a battery.
To make a battery, the negative terminal of one cell is connected to the positive terminal of the next cell and so on.

Our body is a good conductor of electricity.
Conductor Our body is a good conductor of electricity as it allows the electric current to pass through it.

There is a minimum limit on the current which can safely flow in the electric circuits.
In case of electric fuse, there is only a maximum limit on the current which can safely flow in the electric circuits.

The field lines inside the solenoid are parallel straight lines. This indicates that the magnetic field is uniform and is therefore, same at all points inside it.

When the current through the coil stops flowing, the coil does not remain an electromagnet.

The value of the current in a circuit increases heavily at the time of short circuit.

A combination of two or more cells is called a Battery.
Battery A combination of two or more cells, where the positive terminal of one cell is connected to the negative terminal of the next cell, is called a battery.

In an electric circuit a fuse is a Safety device to prevent possible fire.
Safety device If by accident the current exceeds the safe limit, in a circuit, the fuse will blow off and break the circuit and will prevent damage to circuit and possible fire.

The field lines outside the solenoid are curved lines. This indicates that the magnetic field is non-uniform.

The lighted bulb connected to main supply should not be touched by our hand directly, as a lighted bulb can be very hot and can burn our hand as well.

False.
To make a battery of two cells, the negative terminal of one cell must be connected to the positive terminal of the other cell.

It becomes red hot and gives out heat.