Explore topic-wise InterviewSolutions in .

(A) melting

The process by which a solid gets converted into a liquid at a fixed temperature is called melting.

(B) shape

Liquids do not have a definite shape.

(D) black

Traditionally umbrellas are black in colour.

i. In a solar cooker, the food is cooked due to the heat energy obtained from the sun.

ii. A black surface absorbs about 98% of the incident heat radiation that falls on it.

iii. Due to this, the temperature of the solar cooker increases and the food is cooked properly.

Hence, we paint the outer side of the container of a solar cooker with black paint.

(B) Condensation

Condensation is the formation of liquid drops from vapour.

Yes, the water at our school is clean. Our school is in Vijayawada Municipal Corporation. We have a water tank near our school. We get clean water from that tank. We clean our school tank once a month.

(B) black

The outer side of the container of a solar cooker is painted black.

(C) sublimates to a gas

When a mixture of sand, camphor and common salt is heated, camphor sublimates to a gas.

Solids have a definite shape because:

i. The particles of solids are very close to each other.

ii. The forces holding these particles are strong.

(B) Sublimation

Sublimation is a process in which solids go directly into gaseous state without going through the liquid state.

Characteristics of liquids:

i. Liquids have a definite volume.

ii. Liquids do not have a definite shape. They take the shape of the container in which they are kept.

iii. Liquids cannot be compressed easily.

iv. Liquids flow and have the property of viscosity.

The quality of rice should be changed. Better quality should be maintained.

When a substance changes from one state to another, heat provided to the substance is utilised in increasing the distance between the molecules of the substance. However, the energy of the molecules (which is directly related to the temperature) does not increase.

Therefore, the temperature of a substance remains constant while changing from one state to another.

Out of sand and iodine, iodine is a sublimatory substance.

Elasticity of solids:

When an external force is applied to a solid, its shape changes and when this external force is removed, the solid regains its original shape. This property of solids is known as elasticity.

Eg. Rubber band, spring, etc.

(D) Solid ice

Solid ice is not a sublimatory substance.

(C) volume

The space inside a container that is occupied by matter is its volume

The correct answer is B) Multani soil.

No, all the layers have different colour, texture and depth.

The quality of rice should be changed. Better quality should be maintained.

The menu, is different with delicious food items like ehikkis, sweet pongal, vegetable rice, eggs etc.

(C) Density

Density is the ratio of mass of a substance to its volume.

The correct answer is C) China clay.

Clayey soil is suitable for making Ganesh idol.

1. To avoid classroom hunger 

2. To increase school enrolment 

3. To increase school attendance 

4. To address malnutrition 

5. To improve socialization among castes 

6. To empower wanes through employment.

Correct option is A) Education

Rice, Tomato dal, boiled egg, chickpea, sambar, sweet Pongal, etc.

The correct answer is A) Soil.

The common soil problems tested at soil testing centres include : 

1. Low organic matter like carbon 

2. Available minerals in soil – nitrogen, phosphorus and potassium. 

3. Availability of micro nutrient levels 

4. Poor drainage 

5. Soil temperature 

6. Soil moisture 

7. Soil contamination 

8. acidic or basic nature of soil (pH)

I shall ask the following questions. 

1. How can you test the soil for its acidity? 

2. Is it possible to change the basic nature of the soil? 

3. How can the water holding capacity of the soil be increased at a low cost? 

4. Suggest methods to improve the fertility of the soil. 

5. What can be done with the black cotton soil when a building is to be constructed? 

6. As black cotton soil yields, and the building cracks, suggest preventive measures for it.

It helps a farmer to make a soil suitable for growing crops.

The correct answer is D) Minerals.

The main objective of providing a midday meals is to provide nutritive food to the growing children.

1. Black soil is suitable for growing cotton. 

2. Black soil is sticky in nature. It retains water for a long time. 

3. This soil is suitable for the growth of cotton, sugarcane and paddy.

Humus do you observe floating on the top

Yes, all crops are not grown in all soils. Crops are soil specific. For example cashew is grown in sandy soils and cotton is grown in black soils.

1. Soil is a precious resource. 

2. It is the basis for growth of plants. 

3. It is habitat for micro organism, animals, reptiles etc. 

4. Soil is used for various purposes. 

5. Almost all the things in our surroundings directly or indirectly depend on soil.

1. Soil is a substratum in which plants get nutrients. 

2. Soil is a habitat for plants and many animals.

1. Human beings depend on soil for their basic needs. 

2. It has become an important part of our life.

1. About 97% of water is present in seas and oceans which is not useful for drinking and agriculture. 

2. 2% of water is present in the form of rain, snow, sleet, and precipitated water which is not available for consumption. 

3. Hence only 1% of freshwater is available in the form of surface and groundwater sources. This 1% of water is useful for drinking, domestic usage, and agriculture. 

4. Hence, we have to use this 1% of freshwater wisely and judiciously. This water is the basis of life and human civilization. So, water is life. Save water save lives. 

5. So, we considered water as a precious resource.

Do plants get nutrients From soil.

1. Soil testing helps the farmer to know about the current health of the farm’s soil and how to improve it. 

2. It helps farmers to prevent the degradation of soil quality. 

3. It helps to minimize usage of fertilizers.

Soil Formation:

1. Soil is formed slowly as rock (the parent material) erodes into tiny pieces near the Earth’s surface. 

2. Organic matter decays and mixes with inorganic material (rock particles, minerals and water) to form soil. 

3. These days farmers test the soil in the field using soil technologies in order to grow suitable crops in the fields. 

4. Engineers also test the soil profile before constructing multi storied buildings, bridges and dams.

The correct answer is C) Water.

1. Soil is a good habitat. We depend on it for agricultural and construction purposes, making utensils, toys etc. 

2. We know that plants depend on soil for nutrients like mineral salts and water from the soil 

3. Animal life such as burrows or eggs of insects are found in the soil.

1. The water levels in the wells are rapidly decreased. 

2. Many borewells are not working due to depletion in the water table. 

3. People are drilling deeper and deeper borewells to keep up with the dropping water table. It is an expensive task. Hence, they are facing financial troubles. 

4. People are facing drinking water shortages in the village. 

5. People have to walk for miles to get water for their usage. 

6. Many people migrated to different places due to the scarcity of drinking water in the village. 

7. Population explosion, industrial growth, enhanced agriculture activities, deforestation, decrease in the effective area for seepage, and drop in rainfall are other main reasons for the rapid decrease of the water table on the earth.

Sandy soils, black soils, red soils, loamy soils are seen in our state.

Soil can be classified mainly as sandy, clayey and loamy.

Soil profile is nothing but a vertical section through different horizontal layers of soil.