Model Papers -1 - Class 4 MCQ

They rob soil moisture and nutrients from the competing crop and decrease harvest efficiencies. Weeds also compete with the crop for sunlight. Because they are plants competing to survive in a limited space, weeds are actively removing nutrients from the soil to grow taller, stronger and healthier each day.

This type of water is known as "hard water." Hard water makes it difficult to form a lather with soap, leading to the soap taking longer to rinse off. This is because the calcium and magnesium ions in hard water react with the soap to form an insoluble substance that does not easily wash away.

Since, Flask A is connected to flask B, the water is converted into vapors by the process of evaporation, these vapors then reach Flask B where they are again converted to water. so, almost the same amount of water is transferred.  

Option A and Option C, are incorrect because, after insertion of the metal ball in water, the temperature will decrease only and will be less than 100°C. Also, Option B is incorrect as the temperature can not become so much low.
Option D is correct.

The correct statement is D: Grand Trunk Road is a national highway.

Explanation:

• The Grand Trunk Road is one of the oldest and longest major roads in Asia, running from Bangladesh to Pakistan, passing through India.


• It serves as a major national highway, facilitating trade and travel across northern India.


• It has historical significance and is crucial for national connectivity.

 

Frying eggs is a chemical change because it involves the denaturation of proteins in the egg, resulting in a new substance with different properties. The other options involve physical changes, where the substance's chemical structure remains the same.

Circulatory System

- The circulatory system is responsible for transporting blood and nutrients throughout the body.
- When a student scrapes their knee, the body responds by initiating the inflammatory response.
- White blood cells are transported to the wound site through the circulatory system to help fight off any potential infection.
- The white blood cells work to clean up the wound and promote healing by attacking any foreign invaders present.
- The circulatory system plays a crucial role in the body's ability to respond to injuries and protect against infections.

Vegetable cheela (which often contains leafy greens) and milk are good sources of calcium and iron, indicating that Ranchit might have a deficiency in these minerals. The mother is providing a meal rich in these nutrients to address the deficiency.

The inner core, the outer core, mantle and crust are the four layers of earth The Inner Core. It is the centre and the hottest layer of the Earth. The inner core is solid and made up of iron and nickel with temperature up to 5,500 o C. Due to its immense heat energy, the inner core is more like the engine room of the Earth. The Outer Core. The outer core of the Earth is similar to a very hot ball of metals, whose temperature is around 4000 o F to 9000 0 F.