1.
An American physicist
contributed to the joining of relativity
and quantum theory with electromagnetism to form quantum
electrodynamics. He is also known for his reformulation of
quantum mechanics and his research on liquid helium.
Correct Answer
E. Feynman
Explanation
Richard Feynman, an American physicist, made significant contributions to the field of physics. He played a crucial role in the development of quantum electrodynamics, which combined relativity and quantum theory with electromagnetism. Feynman is also known for his reformulation of quantum mechanics and his research on the properties of liquid helium. His work and ideas have had a profound impact on the understanding of the fundamental laws of nature.
2.
A German-American physicist,
revolutionized the assumptions of modern physics when he first
published his theory of relativity in 1905.
Correct Answer
D. Einstein
Explanation
Einstein, a German-American physicist, had a groundbreaking impact on modern physics with his theory of relativity published in 1905. This theory revolutionized the previously held assumptions and understanding of the physical world. Einstein's work challenged and expanded upon the principles established by Newtonian physics, providing a new framework for comprehending space, time, and gravity. His contributions to science have had a lasting influence and continue to shape our understanding of the universe.
3.
One of the most important figures in
the history of science, made significant contributions in the
fields of physics, astronomy, and mathematics. In his Principia
(1687) -- considered by many the greatest work of modern science
--he explained the laws of motion and universal gravitation.
Correct Answer
C. Newton
Explanation
Newton is the correct answer because he is known for his significant contributions in the fields of physics, astronomy, and mathematics. His work, Principia, is considered one of the greatest works of modern science where he explained the laws of motion and universal gravitation. This aligns with the information provided in the question.
4.
He was important in the development of quantum physics. He devised the simplified model of the hydrogen atom. He stated that electrons were found in fixed orbits around the nucleus of the atom.
Correct Answer
A. Bohr
Explanation
Bohr is the correct answer because he made significant contributions to the development of quantum physics. He proposed a simplified model of the hydrogen atom, known as the Bohr model, which stated that electrons exist in fixed orbits around the nucleus. This model helped explain the stability of atoms and laid the foundation for further advancements in quantum mechanics.
5.
Branch of science that studies light
Correct Answer
D. Optics
Explanation
Optics is the branch of science that studies light, including its properties, behavior, and interactions with matter. It explores phenomena such as reflection, refraction, diffraction, and polarization. Optics also encompasses the study of optical instruments and devices, such as lenses, mirrors, and lasers, and their applications in various fields, including physics, engineering, and medicine. Quantum mechanics, acoustics, mechanics, and electromagnetism are all important branches of science, but they do not specifically focus on the study of light like optics does.
6.
Considered by many to be the father of experimental science. His work
laid the foundation for modern physics by defining physical properties
in coherent mathematical terms. He experimented on falling objects and was convicted of heresy for believing that the earth orbited around the sun.
Correct Answer
B. Galileo
Explanation
Galileo is considered the father of experimental science because his work paved the way for modern physics. He defined physical properties using coherent mathematical terms, which laid the foundation for our understanding of the subject. He conducted experiments on falling objects and famously supported the heliocentric model, believing that the earth revolves around the sun. These beliefs led to his conviction of heresy, highlighting his significant contributions and the controversy he faced during his time.
7.
Physicist and cosmologist; probably one of the most
popular modern physicists, mostly because of his popular bestselling
book "Brief History of Time" describing the state of cosmology and astrophysics and appearances
on popular entertainment shows. He has revolutionized our understanding of black holes.
Correct Answer
D. Hawking
Explanation
Stephen Hawking is the correct answer because he is a physicist and cosmologist who is widely known for his popular book "Brief History of Time" and his appearances on popular entertainment shows. He has made significant contributions to our understanding of black holes and has become one of the most popular modern physicists.
8.
Which of the following is considered applied physics
Correct Answer
C. Laser physics
Explanation
Laser physics is considered applied physics because it involves the practical application of the principles and concepts of physics to the development and use of lasers. It focuses on the study of the properties and behavior of lasers, as well as their applications in various fields such as telecommunications, medicine, manufacturing, and research. Laser physics combines theoretical knowledge with experimental techniques to understand and manipulate laser technology for practical purposes, making it a branch of physics that directly contributes to real-world advancements and innovations.
9.
Explained the photoelectric effect by proposing that light consists of small
particles, or quanta, called photons, which carry energy that is
proportional to the frequency of light. He received a Nobel prize in Physics in 1921 for this.
Correct Answer
D. Einstein
Explanation
Einstein explained the photoelectric effect by proposing that light consists of small particles, or quanta, called photons, which carry energy that is proportional to the frequency of light. This explanation revolutionized the understanding of light and laid the foundation for the field of quantum mechanics. Einstein's work on the photoelectric effect earned him a Nobel prize in Physics in 1921.
10.
Branch of physics which studies energy and heat transfer
Correct Answer
C. Thermodynamics
Explanation
Thermodynamics is the branch of physics that studies energy and heat transfer. It deals with the relationships between heat, work, energy, and temperature, and how these factors affect physical systems. Thermodynamics is concerned with understanding and predicting the behavior of systems in terms of their energy transformations, such as the conversion of heat into mechanical work. It is widely applicable in various fields, including engineering, chemistry, and biology, and plays a crucial role in understanding and designing efficient energy systems.
11.
Branch of physics which studies sound
Correct Answer
A. Acoustics
Explanation
Acoustics is the branch of physics that specifically studies sound. It focuses on the production, transmission, and effects of sound waves and how they interact with different materials and environments. Acoustics is concerned with various aspects of sound, including its frequency, intensity, wavelength, and propagation. It has applications in various fields such as music, engineering, architecture, and medicine.
12.
How many significant figures does 0.01150 have?
Correct Answer
B. 4
Explanation
The number 0.01150 has four significant figures. Significant figures are the digits in a number that carry meaning in terms of precision. In this case, the zeros before the 1 are not significant because they are leading zeros. The first significant figure is the 1, and the following three digits (1, 5, and 0) are also significant. Therefore, the number 0.01150 has four significant figures.
13.
How many significant figures does 0.0000003411 have?
Correct Answer
A. 4
Explanation
The number 0.0000003411 has four significant figures. Significant figures are the digits that carry meaningful information in a number. In this case, all the non-zero digits (3, 4, 1, and 1) are significant, and the zeros between them are also significant. Therefore, there are four significant figures in the given number.
14.
How many significant figures does 14344.00 have?
Correct Answer
C. 7
Explanation
The number 14344.00 has seven significant figures because all the digits from 1 to 4 are significant, and the zeros after the decimal point are also significant. The zeros in this case are not just placeholders but are actually measured or known values.
15.
How many significant figures does 0.01 have?
Correct Answer
A. 1
Explanation
0.01 has only one significant figure because the leading zero before the decimal point is not significant. The only significant figure in this number is the digit 1 after the decimal point.
16.
How many significant figures does 0.015 have?
Correct Answer
B. 2
Explanation
0.015 has two significant figures. Significant figures are the digits in a number that carry meaning in terms of precision. In this case, both the digits, 1 and 5, are non-zero digits and therefore significant. Any leading zeros before the non-zero digits are not considered significant.
17.
How do you express 0.0355 in scientific notation? (The symbol ^ means it is an exponent
Correct Answer
C. 3.55X 10^-2
Explanation
To express a number in scientific notation, we move the decimal point to the right or left until there is only one non-zero digit to the left of the decimal point. The number of places we moved the decimal point becomes the exponent of 10. In this case, we start with 0.0355 and move the decimal point two places to the right, resulting in 3.55. Since we moved the decimal point to the right, the exponent of 10 is negative. Therefore, the correct answer is 3.55 X 10^-2.
18.
If you would write 4.6788 in scientific notation but with only two significant figures
Correct Answer
E. 4.7 X 10^0
Explanation
When writing a number in scientific notation, we express it as a number between 1 and 10 multiplied by a power of 10. In this case, the given number is 4.6788. To express it with only two significant figures, we round it to 4.7. Since 4.7 is between 1 and 10, the power of 10 is 0. Therefore, the number can be written as 4.7 x 10^0.
19.
Which is not a subdivision of physics?
Correct Answer
E. Metaphysics
Explanation
Metaphysics is not a subdivision of physics. While the other options - waves, electromagnetism, mechanics, and thermodynamics - are all recognized branches of physics, metaphysics is a separate philosophical discipline that deals with abstract concepts such as existence, reality, and the nature of being. It focuses on questions that go beyond the scope of empirical observation and scientific experimentation, making it distinct from the empirical and experimental nature of physics.
20.
Which of the following is a derived quantity?
Correct Answer
E. All of the above
Explanation
All of the options listed (volume, density, velocity, and speed) are derived quantities. A derived quantity is a physical quantity that is calculated from one or more base quantities. In this case, volume is derived from length, density is derived from mass and volume, velocity is derived from displacement and time, and speed is derived from distance and time. Therefore, all of the options are derived quantities.