The question asks to identify the type of cloud most commonly associated with the halo phenomenon around the sun or moon. This phenomenon is caused by the refraction and reflection of light by ice crystals in the atmosphere. Therefore, the correct cloud type must be one that is composed primarily of ice crystals and is high enough in the atmosphere for these conditions to occur.
B) Cirrostratus — Cirrostratus clouds are high-level, thin, widespread clouds composed of ice crystals. The ice crystals refract and reflect sunlight or moonlight, creating the halo effect. These clouds are often so thin that the sun or moon can be seen through them, allowing the halo to be visible.
The question asks about the approximate altitude range for middle clouds (alto-family). Understanding the classification of clouds based on their altitude is key to answering this question.
B) 2 km to 6 km — This range accurately represents the typical altitude for middle clouds (alto-family) according to meteorological classification.
The question asks to identify the prefix used in cloud names for clouds found in the middle altitude family. This requires knowledge of the standard classification of clouds based on their altitude.
Based on this classification, the prefix "Alto-" is specifically used for middle-altitude clouds.
B) Alto- is the correct prefix for clouds in the middle altitude family, such as Altocumulus and Altostratus.
The question asks to identify the typical appearance of Altocumulus clouds. This requires knowledge of cloud classification and the characteristics of different cloud types.
Correct Option: B) White or grey patches/rolls in waves or rounded masses larger than cirrocumulus
The question asks why Altocumulus clouds are commonly called 'sheep clouds' or 'wool-pack clouds'. This refers to their characteristic appearance in the sky. We need to identify the option that best describes this visual characteristic.
Correct Option: B) They resemble fleecy white-grey patches scattered in the sky
The question asks for the best description of Altostratus clouds. We need to recall the characteristics of different cloud types to identify the correct option.
Based on this analysis, Option A is the most accurate description of Altostratus clouds.
Correct Option: A) Greyish or bluish uniform sheet that covers the sky and through which the sun appears as if seen through ground glass