Multiple choice

Radio telescope is used to see

  1. distant stars and planets

  2. sun and to measure its temperature

  3. stars and to measure its diameter

  4. None of these

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Radio telescopes are used to detect radio frequency radiation emitted by celestial objects like pulsars, galaxies, and quasars. They do not 'see' in the visible spectrum, and their primary purpose is not the direct optical measurement of temperature or diameter as described in the other options.