Set 1 MCQ Questions & Answers Detailed Explanation

MOST IMPORTANT GENERAL SCIENCE MCQ - 3 EXERCISES

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The following question based on Modern And Space Physics, Sources Of Energy topic of General Science Mcq

Questions : At absolute zero, Si acts as

(a) metal

(b) insulator

(c) non-metal

(d) None of these

The correct answers to the above question in:

Answer: (b)

Practice Modern And Space Physics, Sources Of Energy (Set 1) Online Quiz

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Question : 1

Space wave propagation is:

  1. tropospherical propagation
  2. sky wave propagation
  3. line of sight propagation
Which of the above statement(s) is/are correct?

a) 1 and 3

b) 2 only

c) 1 only

d) 2, 3 and 4

Answer: (a)

Space wave propagation is tropospherical propagation and line of sight propagation.

Question : 2

Which of the following cannot be fabricated on an IC?

a) Inductors and transformers

b) Diodes

c) Transistors

d) Resistors

Answer: (a)

Question : 3

The transistor are usually made of

a) metals with high temperature coefficient of resistivity

b) metals with low temperature coefficient of resistivity

c) metal oxides with high temperature coefficient of resistivity

d) semiconducting materials having low temperature coefficient of resistivity

Answer: (c)

Question : 4

Light Emitting Diode (LED) converts

a) electrical energy into light energy

b) thermal energy into light energy

c) light energy into electrical energy

d) mechanical energy into electrical energy

Answer: (a)

Question : 5

In frequency modulation:

a) The frequency of modulated wave varies as amplitude of modulating wave

b) The amplitude of modulated wave varies as amplitude of carrier wave

c) The amplitude of modulated wave varies as frequency of carrier wave

d) The frequency of modulated wave varies as frequency of modulating wave.

Answer: (a)

The process of changing the frequency of a carrier wave (modulated wave) in accordance with the audio frequency signal (modulating wave) is known as frequency modulation (FM).

Question : 6

The service area of space wave communication increases by –

a) Decreasing the height of receiving antenna

b) Increasing the height of both transmitting and receiving antenna

c) Increasing the height of transmitting antenna

d) Decreasing the distance between transmitting and receiving antenna

Answer: (b)

Maximum range of space wave propagation

d = $4/3\text" x 1.23 "[√{H_t}+√{H_r}]$

⇒ d ∝ Ht and d ∝ Hr

∴ d increases if Ht and Hr

i.e. height of transmitting and receiving antenna increases.

GET MODERN AND SPACE PHYSICS, SOURCES OF ENERGY PRACTICE TEST EXERCISES

Set 1

Set 2

Set 3

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