Essential Part

(1) In a computer system, which component is essential for performing calculations and executing instructions?

• (a) Hard drive
• (b) Monitor
• (c) Processor
• (d) Keyboard

Answer

Correct Answer: (c) Processor
The central processing unit (CPU), or processor, is the primary component of a computer that performs calculations and executes instructions. Without it, a computer cannot process data.

(2) For photosynthesis to occur in plants, which element is essential?

• (a) Nitrogen
• (b) Carbon dioxide
• (c) Oxygen
• (d) Phosphorus

Answer

Correct Answer: (b) Carbon dioxide
Photosynthesis requires light, water, and carbon dioxide. The equation for photosynthesis is given by:
\[ 6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2 \]
where \( CO_2 \) represents carbon dioxide.

(3) In an automobile engine, what is the essential component responsible for converting fuel into mechanical energy?

• (a) Steering wheel
• (b) Transmission
• (c) Engine cylinder
• (d) Exhaust pipe

Answer

Correct Answer: (c) Engine cylinder
The engine cylinder is the essential component in an automobile engine responsible for the combustion process, converting fuel into mechanical energy.

(4) In the context of a recipe for baking bread, which ingredient is an essential part of the dough-rising process?

• (a) Sugar
• (b) Yeast
• (c) Salt
• (d) Cinnamon

Answer

Correct Answer: (b) Yeast
Yeast is an essential part of the dough-rising process in bread baking. It ferments and produces carbon dioxide gas, causing the dough to rise.

(5) Which of the following is an essential part of a camera that focuses incoming light onto the image sensor?

• (a) Shutter button
• (b) Lens
• (c) Flash unit
• (d) Tripod

Answer

Correct Answer: (b) Lens
The lens in a camera is an essential part responsible for focusing incoming light onto the image sensor, allowing for the formation of an image.