Class 9 Science - Chapter Natural Resources NCERT Solutions | You have seen weather reports on televis
You have seen weather reports on television and in newspapers. How do you think we are able to predict the weather?
A daily weather forecast is the work of people working for the weather department to collect data on the elements of weather such as maximum and minimum temperatures, maximum and minimum humidity, rainfall, wind speed, etc. Weather satellites are present to take photographs of clouds from space. The maximum and minimum temperature of a day is measured by a thermometer known as the maximum−minimum thermometer. Rainfall is measured by an instrument known as the rain gauge. Wind speed is measured by anemometers. There are various instruments used to measure humidity.
More Questions From Class 9 Science - Chapter Natural Resources
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List any three human activities that you think would lead to air pollution.
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Why is the atmosphere essential for life?
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What causes winds?
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Why do organisms need water?
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Why is water essential for life?
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We know that many human activities lead to increasing levels of pollution of the air, water-bodies and soil. Do you think that isolating these activities to specific and limited areas would help in reducing pollution?
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List any three human activities which would lead to an increase in the carbon dioxide content of air.
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How does the atmosphere act as a blanket?
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How is our atmosphere different from the atmospheres on Venus and Mars?
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What is the greenhouse effect?
Popular Questions of Class 9 Science
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Which of the following has more inertia: (a) a rubber ball and a stone of the same size? (b) a bicycle and a train? (c) a five-rupees coin and a one-rupee coin?
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State the universal law of gravitation.
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Which of the following are matter?
Chair, air, love, smell, hate, almonds, thought, cold, cold-drink, smell of perfume.
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A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force (Fig. 11.3). Let us take it that the force acts on the object through the displacement. What is the work done in this case?
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What is meant by a pure substance?
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How does the sound produced by a vibrating object in a medium reach your ear?
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In a reaction, 5.3 g of sodium carbonate reacted with 6 g of ethanoic acid. The products were 2.2 g of carbon dioxide, 0.9 g water and 8.2 g of sodium observations are in agreement with the law of conservation of mass.
sodium carbonate + ethanoic acid → sodium ethanoate + carbon dioxide + water
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What are canal rays?
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State any two conditions essential for good health.
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Who discovered cells, and how?
Recently Viewed Questions of Class 9 Science
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What are the benefits of cattle farming?
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Why are lysosomes known as suicide bags?
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From a rifle of mass 4 kg, a bullet of mass 50 g is fired with an initial velocity of 35 m s-1. Calculate the initial recoil velocity of the rifle.
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For increasing production, what is common in poultry, fisheries and bee-keeping?
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Complete the table:
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The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?
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Define valency by taking examples of silicon and oxygen.
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Joseph jogs from one end A to the other end B of a straight 300 m road in 2 minutes 50 seconds and then turns around and jogs 100 m back to point C in another 1 minute. What are Joseph’s average speeds and velocities in jogging (a) from A to B and (b) from A to C?
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Two objects, each of mass 1.5 kg, are moving in the same straight line but in opposite directions. The velocity of each object is 2.5 m s-1 before the collision during which they stick together. What will be the velocity of the combined object after collision?
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Which one of the following is a correct electronic configuration of sodium?
(a) 2,8 (b) 8,2,1 (c) 2,1,8 (d) 2,8,1.
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