Applications of E.M. Waves NEET Questions

Physics - Electromagnetic Waves

Applications of E.M. Waves MCQ Questions


7.
Radio waves are produced by:
A.
Heating of metals
B.
Radioactive decay
C.
Inner shell electron transitions
D.
Accelerated motion of charges in conducting wires
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ANSWER :
D. Accelerated motion of charges in conducting wires
8.
Radio waves are detected by:
A.
Photographic film
B.
Receiver aerials (antennas)
C.
Geiger-Muller tubes
D.
Bolometers
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ANSWER :
B. Receiver aerials (antennas)
9.
Wireless communication is primarily based on:
A.
Gamma rays
B.
X-rays
C.
Visible light
D.
Radio waves
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ANSWER :
D. Radio waves
10.
Marconi's pioneering work in 1895 used radio waves to:
A.
Detect cancer cells
B.
Image the human body
C.
Sterilize medical instruments
D.
Transmit signals over long distances
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ANSWER :
D. Transmit signals over long distances
11.
Radio waves can travel long distances because:
A.
They have very high energy
B.
They are absorbed by the atmosphere
C.
They reflect off the ionosphere
D.
They travel through solid objects
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ANSWER :
C. They reflect off the ionosphere
12.
Bluetooth technology uses electromagnetic waves of frequency around:
A.
10 MHz
B.
2.4 GHz
C.
100 GHz
D.
100 kHz
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ANSWER :
B. 2.4 GHz