modern and space physics, sources of energy - Category wise Question and Answer Practice Test with Solutions
Question : 1
The process of superimposing signal frequency (i.e., audio wave) on the carrier wave is known as
a) Reception
b) Modulation
c) Transmission
d) Detection
Answer »Answer: (b)
Question : 2
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 »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.
Question : 3
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 »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 : 4 [CDS]
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 »Answer: (a)
Question : 5
At absolute zero, Si acts as
a) metal
b) insulator
c) non-metal
d) None of these
Answer »Answer: (b)
IMPORTANT general science mcq EXERCISES
general science mcq CATEGORIES
-
» Measurement And SI Units
-
» Measuring Devices And Scales
-
» Mechanics (Mass, Force, Acceleration, Work, Energy, Momentum, Velocity)
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» Force Of Gravity, Solids And Fluids
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» Motion Under Gravity
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» Physical Properties Of Materials
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» Light, Heat, Thermodynamics, Wave Motion, Sound, Optics & Oscillations
-
» Electric Current And Magnetism
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» Nuclear Physics And Conductivity
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» Modern And Space Physics, Sources Of Energy
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» General Concepts Of Chemistry
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» Nature Of Matter And Composition
-
» Atomic Structure Molecules And Nuclear Chemistry
-
» Classification Of Elements, Chemical Bonding, Periodicity In Properties & Physical Transformation
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» Metals, Non Metals, Minerals, Ores, Properties, Uses
-
» Alloys, Carbon & Its Various Forms, Hydrogen & Compounds, Sulphur, Nitrogen, Halogen & Inert Gases
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» Acids, Bases, Salts And Metals
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» Hydrocarbon, Alcohol, Polymer, Organic Acid And Explosive Substance
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» Fuel, Food Preservation, Nutrition, Medicine, Detergents And Fertilizers
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» Inorganic Chemistry
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» Organic Chemistry
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» Environmental Chemistry
-
» Some Important Man Made Materials
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» Sub Divisions Of Biology
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» Genetics, Evolution Of Life & Ecological Biodiversity
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» Taxonomy
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» Heredity
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» Biofertilizer
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» Biological Classification Cell Tissues And Division
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» Human Anatomy
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» Blood Transport System
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» Digestion And Excretion
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» Photosynthesis
-
» Vitamins, Nutrition, Health, Disease And Treatment
-
» Endocrine Glands, Hormones
-
» Physiology Of Plants, Humans And Animals
-
» Reproduction
-
» Genetic Engineering And Bio Technology
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