The electric bulb filament is made of .

Important Questions on Thermal and Chemical Effects of Electric Current

MEDIUM

Physics>Electricity and Magnetism>Thermal and Chemical Effects of Electric Current>Applications of Heating Effect of Electric Current

Why is fuse wire always placed in a live circuit?

EASY

Physics>Electricity and Magnetism>Thermal and Chemical Effects of Electric Current>Applications of Heating Effect of Electric Current

What characteristics should a fuse wire have?

EASY

Physics>Electricity and Magnetism>Thermal and Chemical Effects of Electric Current>Applications of Heating Effect of Electric Current

An electric fuse can prevent accidents arising from-

EASY

Physics>Electricity and Magnetism>Thermal and Chemical Effects of Electric Current>Applications of Heating Effect of Electric Current

When a current is switched ‘on’ in a room heater, it _____.
(Choose one of the following: produces heat/ produces wind).

EASY

Physics>Electricity and Magnetism>Thermal and Chemical Effects of Electric Current>Applications of Heating Effect of Electric Current

The _____ effect of electric current is used in the working of an electric fuse.

EASY

Physics>Electricity and Magnetism>Thermal and Chemical Effects of Electric Current>Applications of Heating Effect of Electric Current

A fuse wire of circuit cross-section and having a diameter of $0.4 \mathrm{mm}$, allows $3 \mathrm{A}$ of current to pass through it. But if another fuse wire of same material and circular cross-section and having a diameter of $0.6 \mathrm{mm}$ is taken, then the amount of current passed through the fuse is:

EASY

Physics>Electricity and Magnetism>Thermal and Chemical Effects of Electric Current>Applications of Heating Effect of Electric Current

An electric fuse works on the _____ effect of current.

MEDIUM

Physics>Electricity and Magnetism>Thermal and Chemical Effects of Electric Current>Applications of Heating Effect of Electric Current

An electric fuse is based on

EASY

Physics>Electricity and Magnetism>Thermal and Chemical Effects of Electric Current>Applications of Heating Effect of Electric Current

If $R_1$ and $R_2$ are the resistances of the filaments of $200 \mathrm{W}$ and $100 \mathrm{W}$ electric bulbs operated at $220 \mathrm{V}$, then $\left(\frac{R_1}{R_2}\right)$ is

EASY

Physics>Electricity and Magnetism>Thermal and Chemical Effects of Electric Current>Applications of Heating Effect of Electric Current

The _____ effect of electric current is used in the working of an electric fuse.

EASY

Physics>Electricity and Magnetism>Thermal and Chemical Effects of Electric Current>Applications of Heating Effect of Electric Current

A fuse wire is connected in _____ (series/parallel) with a group of appliances and/or a single appliance.

EASY

Physics>Electricity and Magnetism>Thermal and Chemical Effects of Electric Current>Applications of Heating Effect of Electric Current

The coil of electric heater is usually made of which of the following?

EASY

Physics>Electricity and Magnetism>Thermal and Chemical Effects of Electric Current>Applications of Heating Effect of Electric Current

A house, served by a $220 \mathrm{V}$ supply line is protected by a $9 \mathrm{A}$ fuse. The maximum number of $60 \mathrm{W}$ bulbs in parallel that can be turned on is:

EASY

Physics>Electricity and Magnetism>Thermal and Chemical Effects of Electric Current>Applications of Heating Effect of Electric Current

An electric fuse is always placed in the _____ wire of an electric circuit.

EASY

Physics>Electricity and Magnetism>Thermal and Chemical Effects of Electric Current>Applications of Heating Effect of Electric Current

What is immaterial for an electric fuse?

EASY

Physics>Electricity and Magnetism>Thermal and Chemical Effects of Electric Current>Applications of Heating Effect of Electric Current

When current is switched ‘on’ in a room heater, its element becomes _____.

EASY

Physics>Electricity and Magnetism>Thermal and Chemical Effects of Electric Current>Applications of Heating Effect of Electric Current

A $40 \mathrm{W}$ Tube light is in parallel with a room heater both connected to a stable main A.C. supply line. If the light is switched off, the heater output.

EASY

Physics>Electricity and Magnetism>Thermal and Chemical Effects of Electric Current>Applications of Heating Effect of Electric Current

When current is switched ‘on’ in a room heater, it gets _____.

EASY

Physics>Electricity and Magnetism>Thermal and Chemical Effects of Electric Current>Applications of Heating Effect of Electric Current

All the bulbs in the given figure are identical. Which bulb lights up most brightly?

EASY

Physics>Electricity and Magnetism>Thermal and Chemical Effects of Electric Current>Applications of Heating Effect of Electric Current

Heating coil in an electric heater is made from _____(nichrome/tungsten).