physics general knowledge questions

25.

Lux is the SI unit of
A.     intensity of illumination
B.     luminous efficiency
C.     luminous flux
D.     luminous intensity
Answer & Explanation

Answer: Option A

Explanation:

The SI unit of intensity of illumination (illuminance) is the lux. An illuminance of 1.0 lux is produced by 1.0 lumen of light shining on an area of 1.0 m^2.
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26.

On a rainy day, small oil films on water show brilliant colours. This is due to
A.     dispersion    B.     interference
C.     diffraction    D.     polarization
Answer & Explanation

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.
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27.

Point A is at a lower electrical potential than point B. An electron between them on the line joining them will
A.     move towards A
B.     move towards B
C.     move at right angles to the line joining A and B
D.     remain at rest
Answer & Explanation

Answer: Option B

Explanation:

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28.

Materials for rain-proof coats and tents owe their water-proof properties to
A.     surface tension
B.     viscosity
C.     specific gravity
D.     elasticity
Answer & Explanation

Answer: Option A

Explanation:

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29.

RADAR is used for
A.     locating submerged submarines
B.     receiving a signals in a radio receiver
C.     locating geostationary satellites
D.     detecting and locating the position of objects such as aeroplanes
Answer & Explanation

Answer: Option D

Explanation:

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30.

Sound of frequency below 20 Hz is called
A.     audio sounds
B.     infrasonic
C.     ultrasonic
D.     supersonics
Answer & Explanation

Answer: Option B

Explanation:

No answer description available for this question.

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