Danger signals are generally red as red light
1). is least bright
2). undergoes least deviation
3). has lowest velocity
4). gives comfort to eye
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1. Which of the following is not reversible?
3. The electric current in a metal wire is due to the flow of -
4. Bats can sense obstacles because they produce
5. Tesla is a unit of magnetic :
7. Intensity of any wave is proportional to which of the following?
8. In nuclear reactor heavy water is used as