Question
What is a switch? State its function in an electric circuit.
✓
Answer
A switch is an on-off device for current flowing in a circuit or in an electric appliance. The switch should always be connected in the live wire. Its main function is either to connect or disconnect an electric appliance in an electric circuit.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Calculate the decrease in the kinetic energy of a moving body if its velocity reduces to half of the initial velocity.
In fig. shows a snap shot of a wave from of frequency 50 Hz in a string. The numbers in the diagram represents distance in centimeters. Fpr the wave motion, find
(a) Wavelength,
(b) Amplitude,
(c) Velocity.
(a) Wavelength,
(b) Amplitude,
(c) Velocity.
What is international convention of colour coding in a cable?
Draw and label the diagram of a simple D.C. motor.
(a) Explain the rotation of the coil, giving a reason for your answer.
(b) How can you reverse the direction of rotation of the armature?
(c) How can you increase the speed of rotation of the motor?
(a) Explain the rotation of the coil, giving a reason for your answer.
(b) How can you reverse the direction of rotation of the armature?
(c) How can you increase the speed of rotation of the motor?
A fish swimming in a pond seems nearer than it really is. Explain.
50 g of metal piece at 27°C requires 2400 J of heat energy so as to attain a temperature of 327°C . Calculate the specific heat capacity of the metal.
An imaginary material reflects red light, scatters green light, transmits blue light, and absorbs yellow, orange, and violet light. A cube of this material is shown in the given diagram.
The surface is illuminated with a beam of white light. What colour will this cube appear?
(i) from above,
(ii) from below and
(iii) from the sides?
The surface is illuminated with a beam of white light. What colour will this cube appear?
(i) from above,
(ii) from below and
(iii) from the sides?
What is meant by the turning effect of force? Give two examples.
(i) (a) Name the kind of reactions taking place :
(i) In the star
(ii) In muclear reactor
(iii) In our body.
(b) When an alpha particle gains two clectrons it becomes neutral and becomes an atom of an element which is rare gas. What is the name of this rare gas?
(ii) State three precautions in the handling of radioactive substances.
(iii) (a) Define radionctivity.
(b) What happens inside the mucleus that causes the emission of a beta particle?
(c) Express the above change in the form of an equation.
(i) In the star
(ii) In muclear reactor
(iii) In our body.
(b) When an alpha particle gains two clectrons it becomes neutral and becomes an atom of an element which is rare gas. What is the name of this rare gas?
(ii) State three precautions in the handling of radioactive substances.
(iii) (a) Define radionctivity.
(b) What happens inside the mucleus that causes the emission of a beta particle?
(c) Express the above change in the form of an equation.
How does the deviation produced by a triangular prism depend on the colours (or wavelengths) of light incident on it? Which colour deviates the most and which the least?