Physics - Study Mode

[#221] Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?
Correct Answer

(D) 3.3 km, 0.30 km

Explanation

Solution: 3.3 km, 0.30 km.

[#222] Intensity of sound at a point is ____ its distance from the source.
Correct Answer

(D) inversely proportional to square of

Explanation

Solution: Intensity of sound at a point is inversely proportional to square of its distance from the source.

[#223] Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open
Correct Answer

(C) at a place in a valley below sea level

Explanation

Solution: Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open at a place in a valley below sea level.

[#224] Radio telescopes are better than optical telescopes because
Correct Answer

(D) All of the above

Explanation

Solution: Radio telescopes are better than optical telescopes because they can detect faint galaxies which no optical telescope can, they can work even in cloudy conditions and they can work during the day and night.

[#225] A small gap is left at the joints of rails in a railway track to
Correct Answer

(A) Avoid the tracks being distorted due to seasonal temperature variation

Explanation

Solution: A small gap is left at the joints of rails in a railway track to avoid the tracks being distorted due to seasonal temperature variation.