Lakshya Education MCQs

Question: In radio-communication, the signals emitted by transmitting antenna are reflected on
Answer: Option C

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Question 1. Rainbow is produced when sunlight fall on drops of rain. Which of the following physical phenomena are responsible for this?
III.Internal reflection
  1.    I, II and III
  2.    I and II
  3.    II and III
  4.    I and III
Answer: Option C
Question 2. Natural radioactivity was discovered by
  1.    Marie Curie
  2.    Ernest Rutherfor
  3.    Henri Becquerel
  4.    Enrico Fermi
Answer: Option C
Question 3. One nanometer is equal to
  1.    10-6m
  2.    10-8m
  3.    10-9m
  4.    10-5m
Answer: Option C
Question 4. The audio signals of TV are
  1.    Amplitude modulated
  2.    Frequency modulated
  3.    Unmodulated
  4.    Velocity modulated
Answer: Option B
Question 5. The GPS device in an automobile uses which communication channel?
  1.    Satellite
  2.    Microwave
  3.    Radio frequency
  4.    Infrared
Answer: Option A
Question 6. In a optical fibre cable, the signal is propagated along the
  1.    Inner Core
  2.    Cladding
  3.    Both core and cladding
  4.    Surface and cladding
Answer: Option A

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