Understanding the Weather Class 7 MCQ
hardUnderstanding the Weather Class 7 MCQ
Understanding the Weather Class 7 MCQ
Question 1.
Relative humidity is expressed as a percentage. What does 100% relative humidity indicate?
(a) The air is completely dry.
(b) The air is saturated with water vapour.
(c) The air is very cold.
(d) The air is very hot.
Answer:
(b) The air is saturated with water vapour.
Question 2.
If a weather forecast predicts a temperature of 35°C with 90% humidity, what should a person consider when planning outdoor activities?
(a) It will be a comfortable day for a picnic.
(b) It might feel hotter due to high humidity.
(c) It will likely rain.
(d) It will be a good day for skiing.
Answer:
(b) It might feel hotter due to high humidity.
Question 3.
Why is it important for fishermen to be aware of weather predictions before heading out to sea?
(a) To ensure they catch more fish.
(b) To avoid dangerous weather conditions.
(c) To know when to return home.
(d) To plan their fishing spots.
Answer:
(b) To avoid dangerous weather conditions.
Question 4.
During a heat wave, which weather element is most critical to monitor for public health?
(a) Precipitation
(b) Wind speed
(c) Temperature
(d) Humidity
Answer:
(c) Temperature
Question 5.
Measuring Humidity
A farmer in Delhi notices that the humidity level is at 52%. He wants to know if it is a good day for drying his crops. Which of the following statements is true regarding humidity levels?
(a) The humidity is too low for effective drying.
(b) The humidity is too high for effective drying.
(c) The humidity is perfect for drying crops.
(d) Humidity does not affect drying crops.
Answer:
(a) The humidity is too low for effective drying.
Question 6.
Weather Predictions and Safety
A coastal town is warned about an impending cyclone. What is the most appropriate action for the local government to take based on weather predictions?
(a) Ignore the warning and continue normal activities.
(b) Evacuate residents from low-lying areas.
(c) Encourage residents to go fishing.
(d) Wait until the cyclone arrives to take action.
Answer:
(b) Evacuate residents from low-lying areas.
Question 7.
Understanding Temperature
If the weather forecast states that the maximum temperature in Chennai is 20°C, and a student feels cold, what could be a possible reason for this feeling?
(a) The student is not used to cold weather.
(b) The temperature is too high for comfort.
(c) The student is wearing too many layers.
(d) The student is feeling unwell.
Answer:
(a) The student is not used to cold weather.
Question 8.
Precipitation Measurement
A weather report states that a region received 30 mm of rainfall in one day. What does this measurement indicate?
(a) The area received 30 liters of rain.
(b) The area received 30 mm of rainwater depth.
(c) The area received 30 inches of rain.
(d) The area received no rain.
Answer:
(b) The area received 30 mm of rainwater depth.
Case Study
I. Weather is influenced by various elements, including temperature, precipitation, atmospheric pressure, wind, and humidity. Each of these elements plays a crucial role in determining the weather conditions we experience daily. For instance, temperature tells us how hot or cold the atmosphere is, while humidity indicates the amount of water vapour present in the air. Atmospheric pressure affects weather patterns, as it is the weight of the air above us. Wind, which is the movement of air from high-pressure areas to low-pressure areas, can significantly impact weather forecasting. Understanding these elements helps us prepare for different weather events, such as storms or heat waves.
Question 1.
Which weather element is primarily responsible for indicating how hot or cold the atmosphere is?
(a) Humidity
(b) Precipitation
(c) Temperature
(d) Atmospheric Pressure
Answer:
(c) Temperature
Question 2.
What does humidity measure in the atmosphere?
(a) The weight of the air
(b) The speed of the wind
(c) The amount of water vapour
(d) The type of precipitation
Answer:
(c) The amount of water vapour
Question 3.
How does atmospheric pressure influence weather patterns?
(a) It determines the temperature of the air.
(b) It affects the movement of air, leading to wind.
(c) It measures the amount of rainfall.
(d) It indicates the humidity levels.
Answer:
(b) It affects the movement of air, leading to wind.
Question 4.
Why is understanding wind important for weather forecasting?
(a) It helps predict humidity levels.
(b) It indicates the temperature changes.
(c) It shows the direction and speed of air movement.
(d) It measures the amount of precipitation.
Answer:
(c) It shows the direction and speed of air movement.
Question 5.
In what way can knowledge of weather elements help us prepare for extreme weather events?
(a) It allows us to predict the exact time of day it will rain.
(b) It helps us understand the general climate of a region.
(c) It enables us to prepare for storms, droughts, and heat waves.
(d) It informs us about the historical weather patterns only.
Answer:
(c) It enables us to prepare for storms, droughts, and heat waves.
II. "Humidity of the air is measured as relative humidity: air that would contain absolutely no water vapour (which is impossible in natural conditions) is rated at 0 %, while air saturated with water vapour will have a humidity of 100%. In practice, dry weather has a relative humidity range between 20% and 40%, while humid weather usually falls between 60% and 80% relative humidity."
Question 1.
What is the relative humidity of air that is completely saturated with water vapour?
Answer:
100%
Question 2.
What is the typical relative humidity range for dry weather?
Answer:
20% to 40%
Question 3.
Why is understanding humidity important in weather forecasting?
Answer:
Understanding humidity helps meteorologists predict weather patterns, such as the likelihood of rain or drought. It also affects human comfort levels and can influence various industries, including agriculture and food processing.