Lighting and Magnetic Effects of Current NDA Questions

NDA Physics

Lighting and Magnetic Effects of Current MCQ Questions


13.
What type of radiation do incandescent bulbs primarily emit?
A.
Ultraviolet radiation
B.
Visible light
C.
Infrared radiation
D.
X-rays
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ANSWER :
C. Infrared radiation
14.
Which type of lighting is considered the most energy-efficient?
A.
Incandescent bulbs
B.
Halogen lamps
C.
CFL
D.
LED lighting
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ANSWER :
D. LED lighting
15.
What does the term 'lumens' measure?
A.
Luminous intensity
B.
Luminous flux
C.
Illuminance
D.
Color temperature
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ANSWER :
B. Luminous flux
16.
What is the purpose of the phosphor coating in fluorescent lamps?
A.
To enhance brightness
B.
To reduce heat
C.
To convert UV light to visible light
D.
To Increase Lifespan
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ANSWER :
C. To convert UV light to visible light
17.
What is the average lifespan of an LED bulb?
A.
5,000 to 10,000 hours
B.
10,000 to 15,000 hours
C.
25,000 to 50,000 hours
D.
50,000 to 75,000 hours
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ANSWER :
C. 25,000 to 50,000 hours
18.
What kind of light is emitted by a blackbody at high temperature?
A.
Monochromatic light
B.
Continuous spectrum
C.
Ultraviolet light
D.
Infrared light
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ANSWER :
B. Continuous spectrum