اختبار شهر سبتمبر الصف الاول الثانوى

Citric acid is found in citrus fruits, such as lemons and oranges. Which of the following sciences helped us to know the synthesis of this acid?

• Physics

• Environmental chemistry

• Chemistry and agriculture

• Chemistry

   

The process of photosynthesis is considered one of the important biological processes that occur in plants, bacteria, and algae, and the science that contributes to understanding this process is

• Chemistry

• Physical Chemistry

• Biochemistry

•    Nuclear chemistry

   

Many solid paints liquefy due to the force of movement that stimulates the brush used in the paint. The previous paragraph expresses an aspect of integration between the science of chemistry and the science of

• Physics

• Mathematics

• Biological

• Agriculture

Which of the following tools can be used to most accurately determine the size of a modern key chain?

•   A graduated cylinder.

   

• A glass beaker

• Graduated conical flask

• Graduated test tube

A tool used to accurately determine the volume of 6.5mL of liquid...

• A glass beaker

• A round bottom flask

• A conical flask

• A pipette

Which of the following solutions has the greater pH value? ... (Note that these solutions are of equal concentration)

•   weak acid

• strong acid

• weak alkali

• neutral

…….. are from one-dimensional nanomaterials

• Carbon nanotubes    

• Thin films

• Bucky balls 

• Nanoshells

One nanometer equals…. Meter

• 10^-7   

• 10^-9

• 10^-6

• 10^-4

Which of the following are used as a carrier in the human body?

• Nano tubes

• Bucky balls C60

• Nano silicon

•  Nano robots

Which one of the following numbers is the greatest

• 10^-3  

   

• 10^-2  

• 10^-7

• 10^-9