Sample Paper for Class 9 Mid Term Science Exam

Section A: Multiple Choice Questions
1. Which of the following is NOT a primary colour?
a) Red
b) Yellow
c) Green
d) Blue

2. What is the chemical formula for water?
a) H2O
b) CO2
c) NaCl
d) CH4

3. What is the SI unit of force?
a) Kilogram
b) Meter
c) Newton
d) Joule

4. Which of the following is a non-metal?
a) Iron
b) Copper
c) Calcium
d) Oxygen

5. The process of conversion of a solid into a gas is called:
a) Melting
b) Condensation
c) Sublimation
d) Evaporation

Section B: Short Answer Questions

1. Define potential energy and give an example.
Potential energy is the energy possessed by an object due to its position or state. For example, a ball held at a height has potential energy because it can do work when it falls.

2. Explain the process of photosynthesis.
Photosynthesis is the process by which green plants use sunlight, carbon dioxide, and water to produce glucose (a type of sugar) and oxygen. This process takes place in the chloroplasts of plant cells, specifically in the green pigment called chlorophyll.

3. What is the difference between a physical change and a chemical change?
A physical change is a change in the physical properties of a substance, such as its shape, size, or state, without any change in its chemical composition. On the other hand, a chemical change is a change in the chemical properties of a substance, resulting in the formation of new substances with different chemical compositions.

Section C: Long Answer Questions

1. Explain the concept of force and its types.
Force is a push or pull that acts on an object, causing it to accelerate or deform. There are several types of forces, including:

- Gravitational force: The force of attraction between two objects due to their masses.
- Frictional force: The force that opposes the motion of an object when it comes in contact with a surface.
- Magnetic force: The force exerted by magnets on magnetic objects.
- Electrostatic force: The force between charged objects.
- Applied force: The force applied by a person or an object on another object.

2. Describe the structure and functions of a cell.
A cell is the basic structural and functional unit of all living organisms. It has several components, including:

- Cell membrane: The outer covering of the cell that regulates the passage of substances in and out of the cell.
- Cytoplasm: The jelly-like substance inside the cell where various cellular activities take place.
- Nucleus: The control center of the cell, containing the genetic material (DNA) and regulating cell activities.
- Mitochondria: The powerhouse of the cell, producing energy through cellular respiration.
- Endoplasmic reticulum: A network of membranes involved in the synthesis and transport of proteins.
- Golgi apparatus: Modifies, sorts, and packages proteins for transport within or outside the cell.
- Ribosomes: Responsible for protein synthesis.
- Vacuoles: Store waste products, nutrients, or water.

These are just a few examples of the questions that may