Sound

The value of 1 kilowatt hour is -

An electric bulb of 100 watt is used for 4 hours. The unit of electric energy used is-

In which of the following options sound may not be across/travel?

Five bulbs each of 100 watt capacity in a tunnel are illuminated continuously for twenty hours. The consumption of electricity will be:

Of the two bulbs in a house, one glows brighter than the other. In this context which of the following statements is correct?

How two identical bulbs should be connected to get maximum light? 1. Both are connected in series. 2. Both are connected in parallel. Select the correct answer using the code given below : Code :

A voltage of 15 volt is applied across a colour coded carbon resistor with first, second and third rings of brown, green and black colours. What is the current flowing through the resistor?

A dynamo which is said to generate electricity actually acts as a :

The device which works on the principle of electromagnetic induction is

A device which converts electrical energy into mechanical energy is –

Electric motors operating at low voltages tend to burn out because –

The filament of an electric bulb is made of –

Consider the following statements : Assertion (A): Lightning conductors prevent buildings from damages in the event of lightning strike. Reason (R): The electric charge conduct to ground through the wire, instead of passing through the structure. Select the correct answer using the codes given below: Code :

In a three-pin electrical plug longest pin should be connected to

In electric apparatus ‘earth’ is used:

The electric current does not flow between two properly connected charged bodies if they are having

A fuse wire is characterized by:

Full form of C.F.L. is –

The gas used in discharge tubes for optical decoration and advertising is –

The most commonly used substance in fluorescent tubes are –

Tubelight is filled with –

What gases are filled in fluorescent tube?

In comparison to an electric bulb, a fluorescent tube is preferred because –

Small drops of the same size are charged to V volts each. If n such drops coalesce to form a single large drop, its potential will be :

Transformer is used for :

Which of the following is the purpose for which a transformer is used?

A mobile phone charger is :

The device used for converting alternating current to direct current is called -

Which of the following option represents the consumption of power in ascending order--

Photovoltaic cells are :

Solar energy is converted into electric energy through:

The Earth's magnetic field is due to :