Pressure Winds Storms and Cyclones Class 8 MCQ
hardPressure Winds Storms and Cyclones Class 8 MCQ
Pressure Winds Storms and Cyclones Class 8 MCQ
Question 1.
What is the SI unit of pressure?
(a) Newton (N)
(b) Pascal (Pa)
(c) Joule (J)
(d) Atmosphere (atm)
Answer:
(b) Pascal (Pa)
Question 2.
As the height of a water column in a pipe increases, what happens to the pressure at the bottom of the pipe?
(a) It decreases
(b) It remains the same
(c) It increases
(d) It fluctuates
Answer:
(c) It increases
Question 3.
Which of the following statements is true regarding air pressure?
(a) Air flows from a region of low pressure to a region of high pressure.
(b) Air flows from a region of high pressure to a region of low pressure.
(c) Air does not exert pressure.
(d) Air pressure is constant everywhere.
Answer:
(b) Air flows from a region of high pressure to a region of low pressure.
Question 4.
What phenomenon occurs when warm air rises and cool air moves in to replace it?
(a) Cyclone
(b) Thunderstorm
(c) Wind
(d) Tornado
Answer:
(c) Wind
Question 5.
In a thunderstorm, which of the following is a common occurrence?
(a) Heavy snowfall
(b) Lightning
(c) Earthquakes
(d) Tsunamis
Answer:
(b) Lightning
Question 6.
Why are overhead water tanks placed at a height in buildings?
(a) To save space
(b) To increase water pressure in taps
(c) To reduce water wastage
(d) To prevent contamination
Answer:
(b) To increase water pressure in taps
Question 7.
Which of the following is NOT a characteristic of a cyclone?
(a) It has a calm centre known as the eye.
(b) It is associated with high winds and heavy rains.
(c) It occurs only in winter.
(d) It forms over warm ocean waters.
Answer:
(c) It occurs only in winter.
Question 8.
If two boats have different base areas and the same number of people, which boat will experience more pressure on its base?
(a) The boat with the larger base area
(b) The boat with the smaller base area
(c) Both boats will experience the same pressure
(d) It cannot be determined
Answer:
(b) The boat with the smaller base area
Question 9.
What happens to the pressure exerted by a liquid in a container as you go deeper into the liquid?
(a) It decreases
(b) It increases
(c) It remains constant
(d) It fluctuates randomly
Answer:
(b) It increases
Question 10.
Why do holes in banners and hoardings help during windy conditions?
(a) To make them lighter
(b) To allow wind to pass through and reduce pressure buildup
(c) To enhance their appearance
(d) To prevent water accumulation
Answer:
(b) To allow wind to pass through and reduce pressure buildup
Case Study
I. The Impact of Atmospheric Pressure on Weather Patterns
Atmospheric pressure plays a crucial role in shaping weather patterns. High-pressure systems are typically associated with clear skies and calm weather, while low-pressure systems can lead to storms and precipitation. For instance, when air moves from a high-pressure area to a low-pressure area, it creates wind. This movement can intensify into storms, demonstrating how atmospheric pressure influences weather dynamics.
Question 1.
Which of the following is typically associated with high-pressure systems?
(a) Stormy weather
(b) Clear skies
(c) Heavy rainfall
(d) Strong winds
Answer:
(b) Clear skies
Question 2.
What happens when air moves from a high-pressure area to a low-pressure area?
(a) It creates calm weather.
(b) It causes the temperature to drop.
(c) It generates wind.
(d) It leads to increased humidity.
Answer:
(c) It generates wind.
Question 3.
High-pressure systems are generally associated with ............ weather, while low-pressure systems can lead to ............ and precipitation.
Answer:
clear; storms
Question 4.
The movement of air from areas of high pressure to areas of low pressure is responsible for the formation of ............
Answer:
wind
Question 5.
Low-pressure systems are usually associated with clear skies and calm weather. (True/False)
Answer:
False
II. Cyclones and Their Formation
Cyclones are intense storm systems that form over warm ocean waters. They develop when warm, moist air rises, creating a low pressure area that draws in surrounding air. As the air spirals inward, it cools and condenses, releasing energy that fuels the cyclone. The pressure difference between the centre and the outer regions of the cyclone leads to strong winds and heavy rainfall, illustrating the relationship between pressure and storm intensity.
Question 1.
What causes the formation of a cyclone?
(a) Cold air rising over warm land
(b) Warm, moist air rising over warm ocean waters
(c) High-pressure areas moving towards low-pressure areas
(d) Strong winds blowing from land to sea
Answer:
(b) Warm, moist air rising over warm ocean waters
Question 2.
What is the region of lowest pressure in a cyclone called?
(a) The eye of the cyclone
(b) The centre of the cyclone
(c) The outer bands
(d) The storm surge
Answer:
(a) The eye of the cyclone
Question 3.
Cyclones are characterised by a ............ pressure area at their centre, which leads to ............ winds and heavy rainfall.
Answer:
low; strong
Question 4.
As warm, moist air rises in a cyclone, it cools and ............ to form clouds, releasing energy that fuels the storm.
Answer:
condenses
Question 5.
Cyclones can only form over land. (True/False)
Answer:
False