CBSE Class 9 Science Solved Practice Paper SA–I: Set–I

Find CBSE Class 9 Science Solved Practice Paper for the coming SA - I exam. These questions not only help the students to prepare for exams in a better manner, but also help them in understanding the depth with which a topic should be studied.

Few Sample Questions from the Question Paper are given below:

Q. What is inter-cropping?

Ans. Growing two or more crops simultaneously on the same field in definite row patterns is known as inter-cropping.

Q. Write down the value of latent heat of vaporisation of Water?

Ans. The value of Latent Heat of vaporisation of Water is 2260 kJ/kg.

Q. Why does an athlete always run some distance before taking a jump?

Ans. An athlete always runs some distance before taking a jump to maintain the inertia of motion and thus take a longer jump.

Q. Define:

(i) Free fall

(ii) Acceleration due to gravity?

Ans.

(i) Free Fall: An object is said to be in a Free Fall whenever it falls towards the earth under the influence of gravitational force alone.

(ii) Acceleration due to gravity: The acceleration acquired by the object due to the earth`s gravitational force while falling down towards the earth is called acceleration due to gravity. It is denoted by g.

Q. How many nutrients are essential for plants? From where do they get these? What are macro-nutrients and micro-nutrients?

Ans. Plants require sixteen nutrients for proper growth and development. Among these sixteen nutrients one (hydrogen) is supplied by water, two (carbon and oxygen) are supplied by air and rest thirteen are supplied by soil.

The nutrients required in large quantities are called macronutrients. These are six:

1. Nitrogen

2. Phosphorus

3. Potassium

4. Calcium

5. Magnesium

6. Sulphur

The nutrients required in small quantities are called macronutrients. These are seven:

1. Iron

2. Manganese

3. Boron

4. Zinc

5. Copper

6. Molybdenum

7. Chlorine