Test: Water - 2 - UPSC MCQ

The correct sequence is as follows - 
C : Ship was floating on the ocean.
D : The fast moving ship hit an iceberg.
B : The ship got pierced from one corner after hitting the iceberg and the water from the ocean started entering the ship.
A : The ship sank.

The second largest source of irrigation in a small district Anantapur is the canals and the lift irrigation technique that lift the water from the underground which is used to irrigate the fields.

The liquid that is being talked about is water which is precious and should be conserved.

The picture shown is that of a boil or a step well that is surrounded by stairs from all around.

The picture depicts the sinking of ball as the gravitational force is more dominant and causing the ball to sit down.

Drainage water is a non-conventional source of irrigation that is treated before use.

The picture below depicts a hand pump which is used to lift water from the underground and makes it available to the people. The pump pushes the water up.

The aquatic plants in the grid are: Watercress, Amazon water lily, Water rice, Duck weed.

Amazon water lily is the largest aquatic plant.

Duckweed is the smallest aquatic plant.

The six aquatic animals in the grid are: Ducks, Fish, Coots, Seals, Crabs and Turtles.

When a mixture of Salt + Sugar + Vinegar + Lemon juice + Soda was added into water, it resulted in the formation of a soluble mixture. All these dissolve in water completely without forming any layers.

Identification of the Crop:

The crop being referred to in the given statement is identified as:

• Rice

Description of the Crop:

Rice is a kharif crop that is widely cultivated and consumed worldwide. It is one of the most important staple foods, particularly in Asian countries. The crop is primarily grown in paddy fields, which are flooded with water during the cultivation process. Rice requires an abundant amount of water for irrigation.

Significance of Rice:

• Rice is a major source of carbohydrates and provides essential nutrients like vitamins and minerals.


• It serves as a staple food for a large portion of the global population.


• Rice is a versatile crop used in various cuisines and dishes, such as biryani, sushi, risotto, and more.


• The cultivation of rice promotes employment opportunities in rural areas and contributes to the economy.


• It plays a crucial role in ensuring food security and reducing poverty in many developing countries.

Conclusion:

Rice is the kharif crop mentioned in the given statement. It is a staple food with significant cultural and economic importance. The crop requires ample water for irrigation and is cultivated in paddy fields.

Oil and water do not mix and form two layers when added into a jar. Oil floats above the water. And when heated, the liquids expand and on cooling, contract.

The picture depicts a giant waterwheel that is used for lifting water and for generating power. 

Amit was diagnosed with malaria. This is proved as the doctor said that the disease was transmitted by the bite of an infected mosquito. Also jaundice, viral and funfair are all diseases that are not spread by the bite of a mosquito.

The correct option is Option A.

Sugar dissolves in water because energy is given off when the slightly polar sucrose molecules form intermolecular bonds with the polar water molecules.

Water and oil are very different in their polarity and are therefore insoluble in each other. Because of the two different parts of the molecule, a soap molecule is soluble in water and at the same time can dissolve fats.

Generally, powders tend to become more soluble in water at higher temperatures. Water is a polar solvent, meaning that its electron density is uneven. Nonpolar powders are insoluble in water. Powders composed of large molecules are insoluble in water due to their larger particle size.

Water can dissolve salt because the positive part of water molecules attracts the negative chloride ions and the negative part of water molecules attracts the positive sodium ions. The amount of a substance that can dissolve in a liquid (at a particular temperature) is called the solubility of the substance.

Rock particles are quite bundled up together. So, it is very difficult to get the water particles smudged in there and let them two mix together. The rocks dissolve in water at a very low rate.

Sucrose being a simple molecule, easily dissolves in water. But rice grains have huge and fibrous carbohydrates called starch. That starch is insoluble in water. You can break down the starch, make it simpler which will make it soluble.

To fill in the blanks, we need to choose the suitable option that describes water that is not in motion and is still at one place. Let's analyze the options given:
A: Running
- Running water refers to water that is flowing or in motion, which is the opposite of what is described in the sentence.
B: Stagnant
- Stagnant water is the correct option as it refers to water that is not moving and is still at one place.
C: Sitting
- Sitting water is not a commonly used term to describe water. It does not accurately convey the meaning of water that is not in motion.
D: None of these
- Since option B (Stagnant) is the suitable choice, option D (None of these) can be eliminated.
Therefore, the correct answer is option B: Stagnant.
Stagnant water is the breeding ground for various insects and mosquitoes. When mosquitoes bite humans, it can result in the transmission of diseases such as malaria. Stagnant water is more prevalent in the rainy seasons as it tends to accumulate in areas with poor drainage.
In summary:
- Water that is not in motion and is still at one place is called stagnant water.
- Stagnant water is the breeding ground for insects and mosquitoes.
- Mosquitoes can transmit diseases like malaria when they bite humans.
- Stagnant water is more common during the rainy seasons.

Water that is not in motion and is still at one place is called stagnant water. Stagnant water is the breeding ground for various insects and mosquitoes. These mosquitoes, when bite humans, result in the malaria infection. Stagnant water is more prevalent in the rainy seasons.
To fill in the blanks:
- __(41)__ - The suitable option to fill in the blank is stagnant as it refers to water that is not in motion and is still at one place.
- __(42)__ - The suitable option to fill in the blank is mosquitoes as they are commonly found breeding in stagnant water.
- __(43)__ - The suitable option to fill in the blank is infection as mosquitoes can transmit diseases like malaria to humans when they bite.
In summary, the correct option to fill in the blanks are:
- __(41)__ stagnant
- __(42)__ mosquitoes
- __(43)__ infection

Water that is not in motion and is still at one place is called __________ water.
- The sentence is describing a type of water that is not moving and remains in one place.
- The suitable option to fill in the blank is "stagnant" water.
- Stagnant water refers to water that is not flowing or circulating.
Stagnant water is the breeding ground for various insects and __________.
- The sentence is stating that stagnant water serves as a breeding ground for insects and something else.
- The suitable option to fill in the blank is "mosquitoes".
- Mosquitoes are known to breed and thrive in stagnant water.
These mosquitoes, when bite humans, result in the __________.
- The sentence is explaining the consequence of mosquitoes biting humans.
- The suitable option to fill in the blank is "malaria".
- Malaria is a disease transmitted through the bites of infected mosquitoes.
Stagnant water is more prevalent in the __________ seasons.
- The sentence is indicating that stagnant water is more common during a specific time of the year.
- The suitable option to fill in the blank is "rainy" seasons.
- Rainy seasons are characterized by increased rainfall, which can lead to the accumulation of stagnant water.
Therefore, the suitable options to fill in the blanks are:
41. Stagnant
42. Mosquitoes
43. Malaria

The density of an object determines whether it will float or sink.

Object A (say candle) is heavier than object B (say clay) but still object A floats because object A is less dense compared to the density of water it is placed in.

Explanation:

• The passage explains that the density of an object determines whether it will float or sink in another substance.


• If an object is less dense than the liquid it is placed in, it will float.


• If an object is more dense than the liquid it is placed in, it will sink.


• Weight is not the determining factor for whether an object will sink or float, but rather the density compared to the density of water.


• An object will sink if its density is more than the density of the liquid it is placed in.

Therefore, the correct answer is C: Sink.

Solubility is the property of a solid, liquid or gaseous substance called solute to dissolve in a solid, liquid or gaseous solvent to form a homogeneous solution.        

Gravity and buoyancy are two primary forces acting on an object when it is placed in water.

Reuse of Water in the Bucket
There are several options for reusing the water filled in the bucket after taking the fishes out of it. Here are some possible solutions:
1. Watering the plants:
- The water in the bucket can be used to water the plants in the garden or indoor pots.
- This will ensure that the water is not wasted and serves a useful purpose.
2. Drinking:
- If the water in the bucket is clean and free from any contaminants, it can be used for drinking purposes.
- However, it is important to ensure that the water is safe to drink before consuming it.
3. Leaving the water in the bucket:
- If the water is clean and there is no immediate need for it, it can be left in the bucket.
- However, this may result in stagnant water and may not be the most efficient use of the resource.
4. Bathing:
- If the water is clean and suitable for bathing, it can be used for personal hygiene purposes.
- This can be a good way to utilize the water and minimize wastage.
In conclusion, the best option for reusing the water filled in the bucket after taking the fishes out of it would be to reuse it for watering the plants. This not only ensures that the water is not wasted but also serves a useful purpose in nurturing the plants.

Correct Answer :- a

Explanation:-   When butter is heated it expands and becomes liquid so it can be spread easily.

Answer:


The correct answer is Earth.


Here is a detailed explanation:


- Air and water are essential elements for supporting life as we know it.
- Mars is a planet that was once thought to have liquid water, but currently, its atmosphere is too thin to support liquid water, and any water present is in the form of ice.
- Jupiter is a gas giant and does not have a solid surface or the conditions necessary for liquid water.
- Earth is the only planet in our solar system known to have both air (in the form of an atmosphere) and water in liquid form on its surface.
- On Earth, the presence of air and water has allowed for the development and sustenance of a wide variety of life forms, including humans.
- The air on Earth is composed mainly of nitrogen, oxygen, and trace amounts of other gases.
- Water covers about 71% of Earth's surface and is found in the form of oceans, rivers, lakes, and groundwater.
- The presence of air and water on Earth is crucial for maintaining a stable climate and supporting the water cycle, which is vital for the distribution of fresh water and the overall functioning of ecosystems.


In conclusion, air and water are found on Earth, making it the only planet in our solar system known to support life as we know it.

As boat floats, in the same way a rock sinks.

1. Limited infrastructure: There were no modern water supply systems like pipelines, water treatment plants, or reservoirs. People relied on natural sources like rivers, wells, or rainwater, which were not always easily accessible.

2. Seasonal availability: Water sources were often dependent on seasonal rains, and during dry periods, many areas faced water shortages.

3. Manual labor: In the past, people had to manually fetch water from wells, rivers, or lakes, which required significant effort and time.

4. Lack of purification methods: Clean and potable water was not always available, as there were fewer technologies to purify water, making access to safe drinking water even more difficult.

Today, with advancements in technology and infrastructure, water is much more easily available through taps, water storage systems, and purification methods, making it more accessible compared to earlier times.