The radiation initially produced in fluorescent tube is
1). (J) infrared
2). ultraviolet
3). microwaves
4). X-rays .
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1. For an astronaut in a space ship, the sky appears
2. Who invented the mobile phone?
3. Sound travels at the fastest speed in
4. Which of the following is an insulator?
5. Which of the following property of sound is affected by change in air temperature?
6. The main pollutant responsible for?Bhopal Gas Tragedy is:
7. Which one of the following is the value of one nanometer?
8. The device which convert AC to DC is :