1. Lux is the SI unit of
A. intensity of illumination
B. luminous efficiency
C. luminous flux
D. luminous intensity
2. On a rainy day, small oil films on water show brilliant colours. This is due to
A. dispersion
B. interference
C. diffraction
D. polarization
3. 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
4. Materials for rain-proof coats and tents owe their water-proof properties to
A. surface tension
B. viscosity
C. specific gravity
D. elasticity
5. 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
6. Sound of frequency below 20 Hz is called
A. audio sounds
B. infrasonic
C. ultrasonic
D. supersonics
A. intensity of illumination
B. luminous efficiency
C. luminous flux
D. luminous intensity
2. On a rainy day, small oil films on water show brilliant colours. This is due to
A. dispersion
B. interference
C. diffraction
D. polarization
3. 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
4. Materials for rain-proof coats and tents owe their water-proof properties to
A. surface tension
B. viscosity
C. specific gravity
D. elasticity
5. 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
6. Sound of frequency below 20 Hz is called
A. audio sounds
B. infrasonic
C. ultrasonic
D. supersonics
ANSWERS:
1. 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.
2. Answer: Option B
3. Answer: Option B
4. Answer: Option A
5. Answer: Option D
6. Answer: Option B
3. Answer: Option B
4. Answer: Option A
5. Answer: Option D
6. Answer: Option B
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