Students revise important topics using Class 7 SST Extra Questions and Class 7th SST Chapter 2 Understanding the Weather Important Extra Question Answer before exams.
Class 7 SST Chapter 2 Understanding the Weather Extra Questions
NCERT Class 7 Social Science Chapter 2 Extra Questions on Understanding the Weather
Understanding the Weather Class 7 Very Short Question Answer
Question 1.
What is the definition of weather?
Answer:
Weather refers to the atmospheric conditions of a particular place at a specific time.
Question 2.
What is precipitation?
Answer:
Precipitation is any form of water such as rain, snow, hail or sleet that falls from the atmosphere to the Earth’s surface.
Question 3.
What is ‘troposphere’?
Answer:
The lowest layer of the atmosphere that extends to a height of 6 to 8 kilometres from the ground is called troposphere.
Question 4.
What is a hygrometer?
Answer:
Hygrometer is an instrument which is used to measure relative humidity.
Question 5.
What is the meaning of ‘adityat jayate vrishti’, the motto of IMD?
Answer:
The meaning of the motto of IMD is “From the Sun arises rain, from rain comes food, and from food, living beings originate”.
Understanding the Weather Class 7 Short Question Answer
Question 1.
Why it is difficult to breathe at higher altitudes?
Answer:
It is difficult to breathe at higher altitudes because air pressure decreases, leading to lower oxygen levels. As altitude increases, the air becomes thinner, reducing the amount of oxygen available for the body, which can cause breathlessness and altitude sickness.
Question 2.
Explain, why Coastal areas have higher humidity than other areas.
Answer:
Coastal areas have higher humidity because they are close to large water bodies like oceans and seas, which, continuously evaporate water into the air. This increases the moisture content in the atmosphere, making the air more humid than in inland areas.
Question 3.
How is relative humidity measured?
Answer:
Relative humidity is measured using a hygrometer or a psychrometer. These instruments compare the actual amount of water . vapour in the air to the maximum amount the air can hold at a given temperature. The value is expressed as a percentage (%).
Question 4.
Why measurement of humidity is of great importance?
Answer:
Measurement of humidity is important because it helps in predicting weather conditions, managing health and comfort, and is essential in agriculture, food processing, museums, industry and preventing damage to materials.
Understanding the Weather Class 7 Long Question Answer
Question 1.
Are the studies of meteorologists reliable and accurate?
Answer:
The studies of meteorologists are generally reliable, but their accuracy varies depending on factors like technology, data availability and time frame. Short-term forecasts i.e., 1-3 days, are highly accurate due to advanced satellites, radars and computer models. Medium-term forecasts i.e., 4-7 days are fairly accurate but may have slight variations. Long-term forecasts i.e., weeks/months are less reliable, as weather patterns can change due to unpredictable atmospheric conditions.
However, meteorologists use scientific models and real-time data, making their studies trustworthy, but 100% accuracy is not always possible, especially for long-term predictions.
Question 2.
How does an anemometer help pilots, air traffic controllers and ships?
Answer:
- An anemometer helps pilots, air traffic controllers and ships by measuring wind speed and direction, which is crucial for safe navigation and operations.
- Pilots use wind data for takeoff, landing and in-fiiglit adjustments to ensure smooth operations.
- Air traffic controllers rely on wind speed information to manage flight paths and airport safety.
- Ships use anemometer readings to navigate safely, adjust sails, and avoid strong winds or storms at sea.
Question 3.
What are weather stations? How are they helpful?
Answer:
A weather station is a facility equipped with instruments and sensors to observe and record weather conditions such as temperature, humidity, wind speed, air pressure and precipitation. Weather stations are essential for monitoring atmospheric conditions and providing accurate data for various applications. They are helpful in:
- Weather Forecasting: Provides real-time data for accurate weather predictions.
- Disaster Management: Helps detect storms, cyclones, and other extreme weather conditions in advance.
- Agriculture: Assists farmers in planning irrigation, planting, and harvesting based on weather conditions.
- Aviation and Navigation: Supports safe air and sea travel by monitoring wind and weather patterns.
- Climate Research: Collects long-term data to study climate change and environmental patterns.
Understanding the Weather Class 7 Source Based Questions
Read the source given below and answer the questions that follow:
“Weather is a state of the Earth’s atmosphere at a particular time and place. But what is an atmosphere? In simple terms, it is the layer of gases that surround some planets in the case of our Earth, we call these gases ‘air’.”
Question 1.
What do we call the layer of gases that surround the Earth?
Answer:
Atmosphere
Question 2.
What is weather?
(a) A type of wind
(b) A state of the Earth’s atmosphere
(c) A layer of the Earth
(d) A kind of cloud
Answer:
A state of the Earth’s atmosphere
Question 3.
The atmosphere refers to the solid part of the Earth. (True or False)
Answer:
False- Reason: Atmosphere refers to the layer of gases surrounding the Earth, not the solid part.
Question 4.
Complete the Analogy:
Atmosphere is to gases as blanket is to:
(a) Cold
(b) Fabric
(c) Warmth
(d) Bed
Answer:
Warmth
Understanding the Weather Class 7 Picture Based Questions
Look at the picture and answer the questions that follow.
(a) What is the name of the instrument shown in the picture?
Answer:
Anemometer
(b) What is the primary function of the instrument shown in the picture?
(i) Measure temperature
(ii) Measure wind speed
(iii) Measure humidity
(iv) Measure air pressure
Answer:
(ii) Measure wind speed
(c) State whether the following statement is true or false:
The instrument shown in the picture helps in predicting wind patterns and weather conditions.
Answer:
True
(d) Complete the analogy:
Air Pressure: Barometer :: Wind Speed:
Answer:
Anemometer
Understanding the Weather Class 7 Competency Based Questions
Question 1.
Will the humidity level of an area near the sea and an area near a river be the same?
Answer:
No, the humidity levels in an area near the sea and an area near a river will not necessarily the same. Coastal areas generally have higher humidity because large water bodies like seas and oceans continuously release moisture into the air. In contrast, areas near ‘ rivers may have lower humidity, depending on factors like the river’s size, surrounding’ vegetation, and climate. However, both locations will have relatively higher humidity than inland areas.
Question 2.
What role does precipitation play in weather conditions?
Answer:
Precipitation play a key role in deter-mining weather conditions. It effects temper-ature, humidity and visibility, and contribute to cloud formation and storm development. Rain, snow, sleet or hail can significantly impact daily weather patterns, influence local climates, and affect human activities such as transportation and agriculture. Precipitation is also an important part of the water cycle, helping maintain ecosystems and replenish water sources.
Understanding the Weather Class 7 Skill Based Questions
Question 1.
A city records a maximum temperature of 35°C and a minimum temperature of 20°C on a particular day. Calculate the range of temperature and explain its significance in understanding daily weather variations.
Answer:
Given data:
Maximum temperature = 35°C
Minimum temperature = 20°C
Range of temperature = Maximum temperature – Minimum temperature
∴ 35°C – 20°C = 15°C
Significance
- The range of temperature helps in understanding the variation between day and night temperatures.
- A high range indicates extreme temperature differences, common in deserts.
- A low range suggests a more stable climate, often seen in coastal areas.
Question 2.
Two cities, A and B, have the following temperature records over three days:
- City A – Max: 30°C Min: 18°C
- City B – Max: 28°C Min: 22°C
Calculate the mean daily temperature for both cities and analyse which city experiences more stable temperature conditions. Justify your answer.
Answer:
Mean Daily Temperature Formula:
Mean Daily Temperature = (Maximum Temperature + Minimum Temperature) ÷ 2
- For City A
(30°C + 18°C) ÷ 2 = 48°C ÷ 2 = 24°C - For City B
(28°C + 22°C) ÷ 2 = 50°C ÷ 2 = 25°C
Analysis - City A has a temperature range of 12°C (30°C – 18°C), while City B has a range of 6°C (28°C – 22°C)
- Since City B has a smaller temperature range, it experiences more stable and moderate temperature conditions compared to City A.
Class 7 Understanding the Weather Extra Questions for Practice
A. Multiple Choice Question
Question 1.
The amount of water vapour in the air is called:
(a) Precipitation
(b) Humidity
(c) Atmospheric Pressure
(d) Atmosphere
Question 2.
Systematic study of weather is done by:
(a) Scientists
(b) Geologists
(c) Meteorologists
(d) Weather Scientists
Question 3.
Humidity also depends on factors like
(i) temperature
(ii) precipitation
(iii) wind
(iv) pressure
(v) location
(vi) altitude
(a) (i), (ii), (iv) & (vi)
(b) (ii), (iii), (v) & (vi)
(c) (i), (ii), (iv) & (v)
(d) (i), (iii), (iv) & (v)
Question 4.
Whether stations take readings of weather instruments at fixed time:
(a) daily
(b) fortnightly
(c) weekly
(d) monthly
Question 5.
Why are weather predictions necessary?
(a) To plan daily activities and agricultural practices
(b) To prepare for natural disasters like storms and cyclones
(c) To ensure safe air and sea transportation
(d) All of these
B. Fill in the Blanks
Question 1.
Temperature tells us how hot or cold the ……….. is.
Question 2.
Water vapour is water in ………. form.
Question 3.
The atmospheric pressure is ……….. near sea.
Question 4.
In high-altitude areas, ……….. levels are low.
Question 5.
Wind vane on the ……….. gives pilots an indication of the direction of the wind during take-off and landing.
C. State Whether True or False
Question 1.
Weather predictions help us prepare for natural disasters effectively.
Question 2.
It is a myth that from early times humans observed nature and learnt her signals to forecast the weather.
Question 3.
The units of temperature, the degree Celsius is more reliable than the degree Fahrenheit.
Question 4.
Temperature recordings can be used to calculate various useful statistics.
Question 5.
People who journey to places at a high altitude are advised to take oxygen cylinders with them.
D. Match the Columns
Match the instruments given in Column A with their corresponding units of measurement, in Column B.
| S.No. | Column A | S.No. | Column B |
| A | Thermometer | (i) | cm or mm |
| B | Barometer | (ii) | km/h |
| C | Rain Gauge | (iii) | percentage |
| D | Anemometer | (iv) | Degree Celsius/Fahrenheit |
| E | Hygrometer | (v) | Millibar (mb) |
(a) A-(v), B-(i), C-(ii), D-(iii), E-(iv)
(b) A-(ii), B-(iii), C-(iv), D-(v), E-(i)
(c) A-(iv), B-(v), C-(i), D-(ii), E-(iii)
(d) A-(iii), B-(iv), C-(v), D-(i), E-(ii)
E. Assertion-Reason Questions
Two statements are given – Assertion (A) and Reason (R). Read them carefully and choose the correct option.
Question 1.
Assertion (A): Ants shift their eggs to higher ground.
Reason (R); This indicates an impending whether change.
Codes
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, and R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Question 2.
Assertion (A): Snow melts quickly when it’s warm.
Reason (R): Curd sets faster in hot weather.
Codes
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, and R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
F. Very Short Answer Type Questions
Question 1.
What is the formula to calculate the range of temperature?
Question 2.
Name the instrument used to measure both maximum and minimum temperature in a day.
Question 3.
What does anemometer measure?
Question 4.
Why does curd set faster in hot weather?
Question 5.
Which unit of temperature is commonly used in weather reports?
G. Short Answer Type Questions
Question 1.
Why coastal areas have higher humidity than areas near rivers?
Question 2.
How does weather prediction help in disaster preparedness?
Question 3.
How precipitation affect weather conditions?
H. Long Answer Type Questions
Question 1.
Explain the working of Six’s thermometer and how it helps measure the range of temperature?
Question 2.
Compare the advantages and disadvantages of using Celsius and Fahrenheit as units of temperature measurement.