Physics
Assertion (A) : Soldiers avoid firing at a target in foggy weather conditions.
Reason (R) : In foggy weather, light gets scattered by tiny water droplets, reducing visibility.
- (A) is true but (R) is false.
- (A) is false but (R) is true.
- Both (A) and (R) are true and (R) is the correct explanation of (A).
- Both (A) and (R) are true, but (R) is not the correct explanation of (A).
Answer
Both (A) and (R) are true and (R) is the correct explanation of (A).
Explanation
Assertion (A) is true because poor visibility can cause misjudgment of target location, increasing the chance of accidental damage or friendly fire.
Reason (R) is true because fog contains tiny water droplets that cause scattering of light which reduces visibility.
Since, the reduced visibility caused by scattering is precisely why soldiers avoid firing as they can’t see the target clearly so here reason clearly explains the assertion.
Related Questions
When objects are viewed through the rising heat of a campfire they appear to shimmer. The optical phenomenon responsible for this effect is:
- refraction
- reflection
- scattering
- total internal reflection
A convex lens with a focal length of 12 cm has an object at a distance of 20 cm in front of the lens. A blurred image is obtained on the screen placed at a distance of 23 cm in front of the lens. In order to obtain a clear image, the screen has to be moved:
- towards the lens.
- away from the lens.
- to a position very far away from the lens.
- either towards or away from the lens.
Two sound waves X and Y have same amplitude and same wave pattern, but their frequencies are 60 Hz and 120 Hz respectively, then:
- X will be shriller and Y will be grave
- X will be grave and Y will be shriller
- X will differ in quality than Y
- X is louder than Y.
In the circuit given below, identify the correct relation between the currents flowing through the 2 Ω, 3 Ω, and 5 Ω resistors:

- current through 2Ω > current through 3Ω
- current through 5Ω < current through 3Ω
- current through 2Ω = current through 5Ω
- current through 5Ω > current through 3Ω