51.
Coolis tube is used to produce

52.
Who among the following discovered X-rays?

53.
Ozone layer in the outer atmosphere helps us in

54.
The waves used in sonography are

55.
In the remote control of television, electromagnetic waves used are

56.
Which one of the following is not a property of electromagnetic waves?

58.
Remote-sensing device has an inbuilt source of

59.
Indicate the correct arrangement for electromagnetic radiation in order of their increasing wavelength.

60.
Which of the following has the shortest wavelength?