1.Which of the following atmospheric layers is responsible for the deflection of radio waves?
2.The value of 1 kilowatt hour is
3.Which waves cannot be transmitted through vacuum?
4.A dynamo which is said to generate electricity actually acts as a
5.Long radio waves are reflected by which of the following layer of Eart's surface?
6.Dynamo is a machine which is used for
7.Wireless communication is reflected back to the Earth's surface by the
8.Turbines and Dyanamous are used to convert which energy to electrial energy
9.What is the distance between two succesive crestsw or successive troughs called?
10.A device which converts electical energy into mechanical energy is
11.Which of the following is a mechanical wave?
12.A device which convers chemical energy into electrical energy is called
13.A rader which detects the presence of an enemy aircraft uses
14.Electric motors operating at low voltages tend to burn out because
15.Which one of the following types of waves are used in a Night Vision appartaus?
16.Which of the ofllowing metals is used as filament in lighting bulbs?
17.Waves used for telecommunication are
18.In a three-pin electrical plug longest pin should be connected to
19.Following rays are used in the diagnosis of intestinal diseases
20.CT scan is done by using
21.The electric current does not flow between two peoperly connected charged bodies if they are having
22.Which element is the best conductor of electricity?
23.A fuse is used in main electric supply as a safety device. Which one of the following statements about the fuse is correct?
24.Principle of fuse is
25.A fuse wire is characterized by
26.The filament of halogen lamp is an alloy of
27.A write with black insulation during electric supply si
28.Which gas is filled in normal tubelights?
29.What gases are filled in fluorescent tube?
30.Which does the white light produce in the tube?
31.Fluorescent tubes are fitted with a choke. The choke coil
32.A mobile phone charger is
33.If potential difference and current flowing through a wire is increased twice each, then electric power
34.Transformer is used for
35.Alternate current is not preferable
36.The device used for converting alternating current to direct current is called
37.Alternating current is converted to direct current
38.The Earth's magnetic field is due to