General Knowledge

Physics - Section 1

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Physics - Section 1

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10 Questions
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Question 51
Lux is the SI unit of

A
intensity of illumination
B
luminous efficiency
C
luminous flux
D
luminous intensity
Correct Answer: Option A

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.

Question 52
On a rainy day, small oil films on water show brilliant colours. This is due to

A
dispersion
B
interference
C
diffraction
D
polarization
Correct Answer: Option B

No answer description available for this question.

Question 53
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
Correct Answer: Option B

No answer description available for this question.

Question 54
Materials for rain-proof coats and tents owe their water-proof properties to

A
surface tension
B
viscosity
C
specific gravity
D
elasticity
Correct Answer: Option A

No answer description available for this question.

Question 55
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
Correct Answer: Option D

No answer description available for this question.

Question 56
Sound of frequency below 20 Hz is called

A
audio sounds
B
infrasonic
C
ultrasonic
D
supersonics
Correct Answer: Option B

No answer description available for this question.

Question 57
Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?

A
Water, iron and air
B
Iron, air and water
C
Air, water and iron
D
Iron, water and air
Correct Answer: Option C

No answer description available for this question.

Question 58
One thousand microns is equal to

A
10-3m
B
10-6m
C
10-9m
D
10-12m
Correct Answer: Option A

No answer description available for this question.

Question 59
Sound travels at the fastest speed in

A
steel
B
water
C
air
D
vacuum
Correct Answer: Option A

No answer description available for this question.

Question 60
oil raise up the wick in a lamp. The principle involves

A
the diffusion of oil through the wick
B
the liquid state of oil
C
capillary action phenomenon
D
volatility of oil
Correct Answer: Option C

No answer description available for this question.

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