Physics Standard Form and SI Units Quiz

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Questions and Answers

What is the standard form representation of 0.000456?

45.6 x 10⁻⁵

4.56 x 10⁻⁴ (correct)

4.56 x 10⁻³

4.56 x 10³

Which of the following is NOT a quantity typically expressed in standard form?

Three megajoules (MJ)

Six microcoulombs (µC)

One kilometer (km)

A dog's speed (correct)

What is 16800 expressed in standard form?

1.68 x 10³

1.68 x 10²

16.8 x 10³

1.68 x 10⁴ (correct)

What is the standard form representation of 0.000000023?

2.3 x 10⁻⁸ Signup and view all the answers

If a value is expressed as $7.5 \times 10^{-6}$, what is that number in decimal form?

0.0000075 Signup and view all the answers

What are the two components that make up a physical quantity?

Numerical magnitude and unit Signup and view all the answers

Which of the following is NOT considered a base quantity in the SI system?

force Signup and view all the answers

What is the SI unit of thermodynamic temperature?

kelvin Signup and view all the answers

What is the correct prefix for $10^9$?

giga- Signup and view all the answers

Which of the following best describes the primary focus of Physics?

The study of matter and its interactions with energy. Signup and view all the answers

Which of the following represents the smallest unit?

nano- Signup and view all the answers

Why is it necessary to have standardized units like the SI units?

To have a universal standard for taking measurements Signup and view all the answers

According to the provided text, what is a crucial aspect of scientific experiments in Physics?

Making accurate measurements to get reliable results. Signup and view all the answers

What is the SI unit for the amount of substance?

mole Signup and view all the answers

How is 0.001 meters best expressed using a prefix?

1 millimeter Signup and view all the answers

Which of these is NOT an area of study within Physics, as listed in the text?

Genetics Signup and view all the answers

What is the correct symbol for the prefix 'micro-'?

µ Signup and view all the answers

Which of the following prefixes represents the smallest value?

nano Signup and view all the answers

What role do 'Disciplinary Ideas' play in the study of Physics?

They are the overarching concepts that can be applied to explain phenomena. Signup and view all the answers

A distance of one million meters can be conveniently expressed as

1 Mm Signup and view all the answers

What does the prefix 'kilo' (k) represent?

$10^3$ Signup and view all the answers

In the context of chemistry, what does one mole contain?

6.02 × $10^{23}$ particles Signup and view all the answers

How are matter and energy related?

Physics is the study of the relationship between them. Signup and view all the answers

What does the text indicate about the process of gaining knowledge in Physics?

It is the result of collaborative work and experiments. Signup and view all the answers

Based on the diagram, which field is NOT directly connected to the study of matter's properties?

Radioactivity Signup and view all the answers

What is the function of models in the context of Physics, as mentioned in the text?

To explain scientific observations and theories. Signup and view all the answers

What is the SI unit for length?

Metre Signup and view all the answers

Which of the following is the closest order of magnitude to the diameter of a wire?

$10^{-2} m$ Signup and view all the answers

What would be the least suitable instrument to measure the diameter of a tree trunk?

A ruler Signup and view all the answers

Which of these has the smallest order of magnitude?

Radius of a hydrogen nucleus Signup and view all the answers

Approximately what is the order of magnitude of the length of a football field?

$10^{2} m$ Signup and view all the answers

Which part of the digital micrometer screw gauge is responsible for ensuring the spindle makes contact with the object?

Ratchet Signup and view all the answers

What is the smallest division measurable by a digital micrometer screw gauge as shown in the table?

0.001 mm Signup and view all the answers

When recording a measurement from a digital micrometer screw gauge, to what level of precision should you record?

0.01 mm Signup and view all the answers

How would you determine the thickness of a single sheet of paper?

Measure the thickness of a stack of paper and divide by the number of sheets. Signup and view all the answers

According to the provided content, which instrument has the smallest measuring range?

Digital Micrometer Screw Gauge Signup and view all the answers

What is the precision of measurement for a digital caliper, as mentioned in the instructions for recording measurements?

0.1 mm Signup and view all the answers

Which of these instruments typically measures volumes of liquids to the nearest 0.05 cm³?

Burette Signup and view all the answers

What is the precision of a metre rule according to the content?

1mm Signup and view all the answers

Why is it important to position your eyes directly above a meter rule when taking a measurement?

To avoid parallax errors. Signup and view all the answers

A meter rule has wear at the zero mark. What is the recommended method to use this ruler for accurate measurements?

Start measuring from a known point on the ruler, and subtract it from the final reading. Signup and view all the answers

What is the term for a complete back-and-forth movement of a pendulum?

Oscillation Signup and view all the answers

If an experiment involving a pendulum is carried out, and a fixed error is found associated with the equipment, what can be said of this error?

This is an example of a systematic error. Signup and view all the answers

Which of the following is the key difference between random errors and systematic errors?

Random errors vary in an unpredictable manner, while systematic errors are constant. Signup and view all the answers

Which measuring instrument is most suitable for determining the circumference of a cylindrical object?

Steel measuring tape Signup and view all the answers

What is the primary purpose of the locking screw on digital calipers?

To ensure the jaws do not move after a measurement Signup and view all the answers

Which part of the digital calipers is used to measure the depth of a hole?

Tail Signup and view all the answers

If you needed to measure the internal diameter of a pipe or tube, which part of the digital calipers would you use?

Inside jaws Signup and view all the answers

What is the main purpose of the zero button on digital calipers?

To reset the measurement displayed on the digital display to zero Signup and view all the answers

Which measurement is typically taken using a metre rule?

The length of a table Signup and view all the answers

What is the most accurate way to measure the external width of a book?

Using digital calipers’ outside jaws Signup and view all the answers

Why should you be careful when using digital calipers to grip an object?

To avoid causing damage to the object or the calipers Signup and view all the answers

Study Notes

Standard Form

Another convenient way of expressing physical quantities is to use standard form.
A standard form is a way of writing numbers, in which a number between 1 to 10 is multiplied by an appropriate power of 10.
Example: 0.00567 = 5.67 x 10^-3, 16 800 = 1.68 x 10⁴

Prefixes for SI Units

Using decimal notation, the distance between air molecules can be expressed as 0.000 000 001 m.
Instead of using decimal notation, it is more convenient to use prefixes to represent quantities.
Example: For example, when measuring short distances such as 1/1,000,000 of a metre, we simply express it as one micrometre.
1 x 10^-6 m (micrometre)
If you have 1 000 000 000 metres, we simply express it as one terametre.
1 x 10¹² m (terametre)

Table 1.2 Some common prefixes and their symbols

Multiplies	Factor	Prefix	Symbol
10¹²	10¹²	tera-	T
10⁹	10⁹	giga-	G
10⁶	10⁶	mega-	M
10³	10³	kilo-	k
10^-1	10^-1	deci-	d
10^-2	10^-2	centi-	c
10^-3	10^-3	milli-	m
10^-6	10^-6	micro-	μ
10^-9	10^-9	nano-	n

Physical Quantities

A physical quantity typically consists of a numerical magnitude and a unit.
Example: 4.5 m (4.5 is the numerical magnitude, and m is the unit).

Base Quantities and SI Units

Base Quantity	SI Unit	Symbol
length	metre	m
mass	kilogram	kg
time	second	s
electric current	ampere	A
thermodynamic temperature	kelvin	K
amount of substance	mole	mol

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Description

Test your knowledge on the standard form representation of numbers and the SI unit system with this quiz. It covers various aspects of physics, including base quantities, prefixes, and the importance of standardized units. Ideal for students looking to reinforce their understanding of these fundamental concepts in physics.