Biophysics Chapter 1 Quiz

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Questions and Answers

Which of the following is NOT one of the basic quantities in mechanics?

Force

Temperature (correct)

Length

Mass

What is the standard of length based on?

Speed of light in vacuum (correct)

Time measured by atomic clocks

Mass of water

Distance of the Earth to the Sun

What is the value of 1 meter as defined since 1983?

Distance travelled by light in vacuum during 1/299,792,458 seconds (correct)

Distance travelled by light in one second

Distance equal to 100 centimeters

Distance equating to 39.37 inches

Which of the following represents a basic quantity of mass?

Kilogram Signup and view all the answers

What is the context in which the standards of length, mass, and time are expressed?

Physics Signup and view all the answers

What is the mass standard based on since 1887?

Platinum-Iridium alloy cylinder Signup and view all the answers

Which of the following chapters covers Fluid Dynamics and Its Biological and Medical Applications?

Chapter 4 Signup and view all the answers

In the evaluation structure, what is the lowest weight assigned to an assessment?

Quizzes/assignments Signup and view all the answers

What unit is used to measure time in the International System of Units (SI)?

Second Signup and view all the answers

How is the second defined in the context of atomic clocks?

Based on the period of vibration of the Cs137 atom Signup and view all the answers

Which of the following quantities has the dimension of $L^2$?

Area Signup and view all the answers

What is the SI unit for measuring electric current?

Ampere Signup and view all the answers

Which expression correctly represents the dimension of kinetic energy?

ML^2T^{-2} Signup and view all the answers

What is the relationship between potential energy and kinetic energy in classical mechanics?

Potential energy equals kinetic energy Signup and view all the answers

In the context of dimensional analysis, which of the following correctly describes velocity?

Length divided by time Signup and view all the answers

According to dimensional analysis, which of the following quantities has the dimension of $MLT^{-1}$?

Momentum Signup and view all the answers

What is the purpose of dimensional analysis in formula evaluation?

To check the validity of a specific formula and derive some formulas. Signup and view all the answers

What does the formula for distance travelled, $x = rac{1}{2} at^2$, suggest about the relationship between distance, acceleration, and time?

Distance is directly proportional to the product of acceleration and time squared. Signup and view all the answers

In dimensional analysis, if the left-hand side (L.H.S) represents distance with the dimension $[L]$, what should the right-hand side (R.H.S) dimensions equal?

[L] Signup and view all the answers

When deriving a formula using dimensions, what is the main assumption made about the factors affecting distance?

Both acceleration and time affect distance. Signup and view all the answers

In the expression $a = kr^{-1}v^{-2}$, what does the negative exponent on $r$ indicate?

Acceleration decreases with increasing radius. Signup and view all the answers

What happens to the values of n and m when determining the powers affecting acceleration in the dimensional equation?

They are determined through the process of matching dimensions. Signup and view all the answers

Why might it be necessary to convert units in dimensional analysis?

To maintain consistency in calculations across different systems. Signup and view all the answers

What is the derived formula for distance when both acceleration and time are considered in the equation?

x = k a t^2 Signup and view all the answers

What is the volume of a solid cube with each edge measuring 5.35 cm in basic SI units?

1.53 x 10^-4 m³ Signup and view all the answers

How is density calculated for the solid cube with a mass of 856 g?

Density = Mass/Volume Signup and view all the answers

Which of the following equations is dimensionally correct?

vf = vi + ax Signup and view all the answers

What are the SI units of the proportionality constant G in Newton’s law of universal gravitation?

m³/kg·s² Signup and view all the answers

What is the formula for the period of a pendulum in relation to its length?

t = 2π * √(g/λ) Signup and view all the answers

Convert 5.35 cm to meters using the appropriate conversion factor.

0.0535 m Signup and view all the answers

If the mass of an object is 0.856 kg and its volume is 1.53 x 10^-4 m³, what is the density?

5.59 x 10^3 kg/m³ Signup and view all the answers

What is the relationship between gravitational force and distance in Newton’s law of universal gravitation?

The force increases with decreasing distance Signup and view all the answers

Study Notes

Biophysics Course

Instructor: Dr. Mohaned Mohmmed
Institution: Badr University, Assiut
Course Delivery: Face-to-face lectures
Textbooks:
- Physics for Scientists and Engineers by R.A. Serway and J.W. Jewett, 8th Edition, Thomson Books/Cole 2013
- College Physics by Paul Peter Urone, Roger Hinrichs, OpenStax

Course Evaluation

Mid-term exam: 10 marks
Quizzes/Assignments: 10 marks
Practical exam: 20 marks
Oral exam: 10 marks
Final exam: 50 marks

Course Topics & Timeline

Chapter 1 (2 weeks): Physics and Measurement
Chapter 2 (4 weeks): Statics and Torque (Mid-term exam)
Chapter 3 (2 weeks): Fluid Statics
Chapter 4 (2 weeks): Fluid Dynamics and Biological/Medical Applications
Chapter 5 (2 weeks): Physics of Hearing
Final Exam: (Time not specified)

Chapter 1: Physics and Measurement

Topics:
- Standards of length, mass, and time
- Dimensional Analysis
- Conversion of units

1. Standards of Length, Mass, and Time

Length: Based on the speed of light in a vacuum (since 1983).
- 1 meter is the distance light travels in a vacuum in 1/299,792,458 of a second.
Mass: Based on the mass of a platinum-iridium (Pt-Ir) alloy cylinder (since 1887).
- 1 kilogram is the mass of this specific alloy cylinder.
Time: Based on the atomic clock (since 1960).
- 1 second is based on the characteristic frequency of radiation from a Cesium-133 (Cs¹³³) atom.

2. Dimensional Analysis

Dimensions: Represent the physical nature of a quantity.
Basic Quantities in Mechanics: Length (L), Mass (M), Time (T)
Examples:
- Area: L²
- Volume: L³
- Velocity: LT⁻¹
- Acceleration: LT⁻²

3. Conversion of Units

Examples:
- 1 mile = 1609 meters
- 1 foot = 0.3048 meters
- 1 inch = 0.0254 meters
- 1 kg = 1000 grams

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Description

Test your knowledge on the fundamentals of physics and measurement with this quiz based on Chapter 1 of the Biophysics course. Explore topics such as standards of length, mass, and time, alongside dimensional analysis. Prepare to solidify your understanding of essential concepts crucial for scientific study.