Totally reflecting prism is used in:
Periscope
Binoculars
Periscope and binocular
Telescope
The way of doing business by using web is called:
Sources of entertainment
Web business
E-commerce
E-mail
battery is one of the source of:
heat
light
current
sound
From which of the following we can get information almost about everything:
Book
Teacher
Computer
Internet
How does sound travel from its source to your ear:
By changes in air pressure
By vibration in wires or strings
By electromagnetic waves
By infrared waves
Radio waves are:
Longitudinal waves
Transverse waves
Electromagnetic waves
All of these