Question 1

Question 1How is the Fahrenheit scale different from the Celsius scale? Which one among the two scales is used to measure temperature in India?

Accepted Answer

The two most common thermometer scales in use are Fahrenheit and the Celsius scales. On Fahrenheit scale, the melting point of ice is 32°F and the boiling point of water is 212°F whereas on the Celsius scale, the melting and boiling points are 0°C and 100°C respectively. In India, the Celsius scale is used to measure temperature.

Question 2

Question 2Describe the working principle of an aneroid barometer.

Accepted Answer

An aneroid barometer has a corrugated metal box which is made air tight by pumping air out of it and completely sealed. It has a thin flexible lid which is sensitive to changes of air pressure. The lid is pressed inward or outward as the air pressure increases or decreases respectively. The inward or outward movement of the lid moves a system of levers which is connected to a pointer. The pointer moves over the graduated dial to give the reading of the atmospheric pressure.

Question 3

Question 3Name the unit used to measure wind speed. What does the arrow of the wind vane point?

Accepted Answer

The unit used to measure wind speed is kilometres or knots per hour.The arrow of the wind vane points to the direction from which the wind blows.

Source: This question is from Weather Instruments, Geography &mdash; Class 7, ICSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter Weather Instruments: Question, Unit, Measure, Wind, Speed, Arrow. These are fundamental topics in Geography that students are expected to master as part of the ICSE Class 7 curriculum.A thorough understanding of these concepts will help you answer similar questions confidently in your ICSE examinations. These topics are frequently tested in both objective and subjective sections of Geography papers. We recommend revising the relevant section of your textbook alongside practising these solved examples to build a strong foundation.
How to Approach This QuestionRead the question carefully and identify what is being asked. Break down complex questions into smaller parts. Use the terminology and concepts discussed in this chapter. Structure your answer logically — begin with a definition or key statement, then provide supporting details. Review your answer to ensure it addresses all parts of the question completely.
Key Points to RememberReference specific locations, latitudes, or regions in your answers.
Explain both physical and human factors where applicable.
Use map references and diagrams to strengthen answers.
Link geographic concepts to current real-world examples.
Related Questions from Weather InstrumentsQ1: Question 1 How is the Fahrenheit scale different from the Celsius scale? Which one among the two...
Q2: Question 2 Describe the working principle of an aneroid barometer.
Q4: Question 4 How will you find the humidity in air? What will be your conclusion if both the dry and...
Q5: Question 5 Define isohyets.
Practice more questions from Weather Instruments &mdash; Geography, Class 7 ICSE

Question 4

Question 4How will you find the humidity in air? What will be your conclusion if both the dry and the wet bulb thermometers show the same reading?

Accepted Answer

We can find the humidity in air by using Hygrometer or dry and wet bulb thermometer. It has two identical thermometers fixed on to a wooden frame. The bulb of one thermometer is kept uncovered. This is the dry bulb thermometer. The bulb of other thermometer is wrapped in a piece of wet cotton cloth. This is the wet bulb thermometer.When the wind blows, water from the wet bulb thermometer evaporates and thus lowers the temperature. Hence, the wet bulb thermometer records a temperature lower than the dry bulb thermometer. The difference in the readings of the dry bulb thermometer and wet bulb thermometer helps us to find the humidity in the air. The lesser the difference, the more humid is the air.If both the dry and the wet bulb thermometers show the same reading, it can be concluded that the air is fully saturated and the relative humidity is 100 percent.

Question 5

Question 5Define isohyets.

Accepted Answer

On a map, the distribution of rainfall is shown using lines which join the places having the same amount of rainfall. Such lines are called isohyets. They are labelled with the rainfall values.