Technology MCQs

✅ The correct answer is option A.
A collection of atoms or molecules that can be excited to a higher energy state is called an active medium. Before lasing can occur, the active media is “pumped”. The process of raising the atoms in the active media from a lower energy state to a higher state is like pumping water up from a well.

✅ The correct answer is option D.

✅ The correct answer is option C.

✅ The correct answer is option C.

✅ The correct answer is option B.
Twisting the yoke will tilt the picture. A projection color television uses three picture tubes and yokes for red, green and blue light.

✅ The correct answer is option D.

✅ The correct answer is option B.

✅ The correct answer is option A.

✅ The correct answer is option C.
A given signal’s second harmonic is twice the given signal’s fundamental frequency. Harmonics are generated when there are non-linearities in an amplifier (there are always non-linearities). The worse the non-linearities, the more harmonics. A signal at 27.5 MHz (approximate frequency for US citizen’s band) would have a second harmonic at 55.0 MHz (on US channel 2!). Can you see why there might be problems? A CB operator might do well to place a low-pass filter on his radio.

✅ The correct answer is option A.