Chapter-2 Understanding the Weather — Online MCQ Test
SOCIAL · Grade 7 · CBSE(NCERT)
Practice Chapter-2 Understanding the Weather with a free chapter-wise online MCQ test.
This chapter covers: atmospheric pressure - temperature - wind speed - precipitation - humidity - weather forecasting.
AI-generated questions from basic to board-exam level, with instant results and explanations.
Chapter-2 Understanding the Weather — Important Questions & Answers
Which of the following is NOT a component of weather?
- A. Temperature
- B. Atmospheric pressure
- C. Soil texture
- D. Humidity
Answer: C. Soil texture
Soil texture is a characteristic of soil, not a weather component. Weather consists of temperature, pressure, humidity, wind, and precipitation.
Soil texture is a characteristic of soil, not a weather component. Weather consists of temperature, pressure, humidity, wind, and precipitation.
What is atmospheric pressure?
- A. The weight of air pushing down on Earth's surface
- B. The temperature of the atmosphere
- C. The amount of water vapor in air
- D. The speed of wind movement
Answer: A. The weight of air pushing down on Earth's surface
Atmospheric pressure is the force exerted by the weight of the air column above any point on Earth's surface.
Atmospheric pressure is the force exerted by the weight of the air column above any point on Earth's surface.
Humidity is primarily measured as:
- A. The speed of air movement
- B. The amount of water vapor in the air
- C. The atmospheric pressure at a location
- D. The temperature of the atmosphere
Answer: B. The amount of water vapor in the air
Humidity refers to the amount of water vapor present in the air, expressed as relative humidity or absolute humidity.
Humidity refers to the amount of water vapor present in the air, expressed as relative humidity or absolute humidity.
What instrument is used to measure atmospheric pressure?
- A. Thermometer
- B. Anemometer
- C. Barometer
- D. Hygrometer
Answer: C. Barometer
A barometer is the instrument specifically designed to measure atmospheric pressure in millibars or inches of mercury.
A barometer is the instrument specifically designed to measure atmospheric pressure in millibars or inches of mercury.
How does temperature affect atmospheric pressure?
- A. Warm air becomes denser and increases pressure
- B. Warm air becomes less dense and decreases pressure
- C. Temperature has no effect on atmospheric pressure
- D. Cold air always increases pressure regardless of other factors
Answer: B. Warm air becomes less dense and decreases pressure
When air is heated, it expands and becomes less dense, causing atmospheric pressure to decrease in that region.
When air is heated, it expands and becomes less dense, causing atmospheric pressure to decrease in that region.
Why does wind flow from areas of high pressure to low pressure?
- A. Wind always flows in the same direction
- B. Air moves from areas of high pressure (denser) to low pressure (less dense) to balance pressure differences
- C. Wind is caused by the rotation of Earth only
- D. Wind direction is random and unpredictable
Answer: B. Air moves from areas of high pressure (denser) to low pressure (less dense) to balance pressure differences
Wind is generated when air masses at different pressures try to equalize, with air naturally moving from high to low pressure zones.
Wind is generated when air masses at different pressures try to equalize, with air naturally moving from high to low pressure zones.
A student claims that 'high wind speed always indicates fair weather.' Is this claim correct?
- A. Yes, strong wind always means good weather
- B. No, strong winds can accompany storms, cyclones, and severe weather as well as fair weather
- C. Wind speed has nothing to do with weather conditions
- D. High wind only indicates rain, not other weather patterns
Answer: B. No, strong winds can accompany storms, cyclones, and severe weather as well as fair weather
High wind speeds can be part of severe weather systems like cyclones, storms, and cold fronts, as well as gentle breeze conditions in fair weather.
High wind speeds can be part of severe weather systems like cyclones, storms, and cold fronts, as well as gentle breeze conditions in fair weather.
Two weather stations record data at the same time. Station A: 1005 mb pressure, Station B: 1015 mb pressure. Which statement is most accurate about wind movement between these stations?
- A. Wind will flow from Station B (high pressure) to Station A (low pressure)
- B. Wind will flow from Station A (low pressure) to Station B (high pressure)
- C. No wind will flow between the stations
- D. Wind direction depends only on humidity, not pressure
Answer: A. Wind will flow from Station B (high pressure) to Station A (low pressure)
Wind is created by pressure gradients and flows from high-pressure areas toward low-pressure areas, so from Station B (1015 mb) to Station A (1005 mb).
Wind is created by pressure gradients and flows from high-pressure areas toward low-pressure areas, so from Station B (1015 mb) to Station A (1005 mb).
Consider this anomalous weather data: Temperature 35°C, Humidity 5%, Pressure 1020 mb, Wind Speed 2 km/h. A meteorologist questions this data's validity. Which element is MOST suspicious and likely erroneous?
- A. Temperature of 35°C is suspicious
- B. Pressure of 1020 mb is suspicious
- C. Humidity of 5% with 35°C temperature and high pressure is inconsistent; such extreme heat typically causes higher evaporation, requiring impossible conditions
- D. Wind speed of 2 km/h is suspicious
Answer: C. Humidity of 5% with 35°C temperature and high pressure is inconsistent; such extreme heat typically causes higher evaporation, requiring impossible conditions
At 35°C with high pressure (1020 mb), the atmosphere typically contains more moisture, making 5% humidity extremely unlikely. This combination suggests instrument malfunction.
At 35°C with high pressure (1020 mb), the atmosphere typically contains more moisture, making 5% humidity extremely unlikely. This combination suggests instrument malfunction.
A weather prediction model fails because it only measures current atmospheric pressure without considering atmospheric stability indices. Which concept does this failure illustrate?
- A. Single weather elements cannot reliably predict outcomes; multiple interacting factors must be considered comprehensively
- B. Atmospheric pressure is useless for weather forecasting
- C. Weather is completely random and unpredictable
- D. Only pressure matters for accurate forecasting
Answer: A. Single weather elements cannot reliably predict outcomes; multiple interacting factors must be considered comprehensively
This demonstrates that weather forecasting requires analyzing multiple elements and their interactions (pressure, temperature, humidity, stability), not single parameters in isolation.
This demonstrates that weather forecasting requires analyzing multiple elements and their interactions (pressure, temperature, humidity, stability), not single parameters in isolation.