Red is used as an emergency or danger signal as –

Related MCQs

• Danger signals are generally red as red light –
• Red light is used for signals because it has –
• If a carrier wave of 1000 kHz is used to carry the signal, the length of transmitting antenna will be equal to               .
• Radio waves, microwaves, infra-red spectrum, ultraviolet rays, X-rays and gamma rays are classified as ______.
• In sunlight, a rose appears red. In green light, the same rose appears –
• Red data book contains data of which of the following?
• Which one of the following is called a red planet?
• Which colour is formed when Red and Green are mixed?
• Sun appears red in colour at sun-rise and sunset due to –
• The device which transfer the signal from low resistance region to high resistance region is –