Which of the following is true about the study of physics?

• Physics is unrelated to chemistry or biology.

• Physics is the study of matter and energy.

• Physics only deals with the laws of gravity.

• Physics is solely about the study of motion.

Answer explanation

The correct choice, 'Physics is the study of matter and energy,' accurately describes physics as it encompasses the fundamental principles governing the physical universe, including interactions between matter and energy.

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1.1.1a

Which of the following is true about the study of chemistry?

• Chemistry is unrelated to physics or biology.

• Chemistry is the study of matter and its interactions.

• Chemistry focuses solely on the properties of gases.

• Chemistry is the study of living organisms.

Answer explanation

The correct choice states that chemistry is the study of matter and its interactions, which accurately describes the field. The other options incorrectly limit chemistry's scope or misrepresent its focus.

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1.1.1a

Why was the SI system created? 

• To provide a universal standard for measurement.

• To create a system only for scientific use.

• To eliminate all other measurement systems.

• To complicate measurement systems.

Answer explanation

The SI system was created to provide a universal standard for measurement, ensuring consistency and clarity across various fields, not just for scientific use. This helps facilitate communication and comparison of measurements globally.

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1.1.1b

How long is the red line?

• 4.71 cm

• 4.31 cm

• 4.69 cm

• 4.35 cm

Answer explanation

The red line measures 4.31 cm, which is the correct answer among the options provided. The other choices are either slightly longer or shorter, making 4.31 cm the accurate measurement.

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1.1.1b

This crayon is approximately ______ long.

• 7.00 cm

• 7.09 cm

• 7.90cm

• 7.20 cm

Answer explanation

The crayon's length is best approximated by 7.09 cm, as it is the closest measurement to the typical size of a crayon, making it the most accurate choice among the options provided.

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1.1.1b

Which unit is NOT used in the metric system?

• mile

• Kelvin

• gram

• kilometer

Answer explanation

The mile is a unit of distance used in the imperial system, not the metric system. The metric system uses units like kilometers, grams, and Kelvin for measurement.

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1.1.1c

Match the following concepts to their SI units

• seconds

• mass

• meter

• time

• kilogram

• length

Tags

1.1.1c

To change kilometers to meters, move the decimal place...

• 3 to the right.

• 3 to the left.

• 2 to the right.

• 1 to the left.

Answer explanation

To convert kilometers to meters, you start by moving the decimal point three places to the right. For example, 1 kilometer becomes 1000 meters. This works because there are 1,000 meters in one kilometer, so converting is the same as multiplying by 1,000. Therefore, the correct choice is ‘3 to the right’.

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1.1.1c

how many meters is 2100 millimeters?

• 2.1 m

• 0.0021 m

• 0.021 m

• 2100 m

Answer explanation

To convert 2100 millimeters to meters, begin by moving the decimal point three places to the left. The number 2100 becomes 2.100, which is the same as 2.1 meters. This works because there are 1,000 millimeters in one meter, so converting is the same as dividing by 1,000. Therefore, 2100 ÷ 1000 = 2.1 meters.

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1.1.1c

What is the first step of the scientific method?

• Hypothesize

• Question

• Test

• Conclude

Answer explanation

The first step of the scientific method is to ask a question. This step involves identifying a problem or curiosity that prompts further investigation, leading to the formulation of a hypothesis.

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1.2.1a