Physical World - Online Test
Q1. Hypothesis
Answer : Option D
Explaination / Solution:
In science, a hypothesis is an idea or explanation that you then test through study and experimentation.
Q2. Universal law of gravitation does not explain
Answer : Option C
Explaination / Solution:
Universal law of Gravitational explain the force of attraction between two bodies having mass and placed at a distance but it never explain how this force generated and what is the origin of this.
Q3. What the universal law of gravitation says is that, if we assume that any two bodies in the universe attract each other with a force proportional to the product of their masses and inversely proportional to the square of the distance between them, then we can explain
Answer : Option D
Explaination / Solution:
Earth and any body pull each other towards themselves , the force applied on both of them remaining the same , but the changes in position of an object is determined by its velocity and acceleration .
Q4. Postulates are
Answer : Option D
Explaination / Solution:
A postulate is an assumption, that is, a proposition or statement, that is assumed to be true without any proof. Postulates are the fundamental propositions used to prove other statements known as theorems. Once a theorem has been proven it is may be used in the proof of other theorems.
Q5. Model in physics refers
Answer : Option D
Explaination / Solution:
A model is a representation of something that is often too difficult (or impossible) to display directly. While a model's design is justified using experimental information, it is only accurate under limited situations. An example is the commonly used "planetary model" of the atom, in which electrons are pictured as orbiting the nucleus, analogous to the way planets orbit the Sun. We cannot observe electron orbits directly, but the mental image helps explain the observations we can make, such as the emission of light from hot gases. Physicists use models for a variety of purposes.
Q6. Technology is concerned with
Answer : Option A
Explaination / Solution:
Technology is the making, modification, usage, and knowledge of tools, machines, techniques, crafts, systems, and methods of organization, in order to solve a problem, improve a pre-existing solution to a problem, achieve a goal, handle an applied input/output relation or perform a specific function. It can also refer to the collection of such tools, including machinery, modifications, arrangements and procedures.
Q7. Technology started with
Answer : Option B
Explaination / Solution:
The history of technology is the history of the invention of tools and techniques and is similar to other sides of the history of humanity. Technology can refer to methods ranging from as simple as language and stone tools to the complex genetic engineering and information technology that has emerged since the 1980s.
Q8. What is the correct sequence of events technology gives rise to new science or new science gives rise to technology?
Answer : Option C
Explaination / Solution:
Technology is often a consequence of science and engineering, although technology as a human activity precedes the two fields. For example, science might study the flow of electrons in electrical conductors by using already-existing tools and knowledge. This new-found knowledge may then be used by engineers to create new tools and machines such as semiconductors, computers, and other forms of advanced technology.
Q9. Technology strives
Answer : Option A
Explaination / Solution:
Science and technology will continue to generate all sorts of new enhancers, and the quest for enhancement is not necessarily unfair or unethical. We humans are inveterate enhancers, striving to increase our intelligence and to improve our memory and powers of perception.
Q10. One example where technology predates science is
Answer : Option C
Explaination / Solution:
Thomas Newcomen's atmospheric engine was the first commercial true steam engine using a piston, and was used in 1712 for pumping in a mine. They became popular for mining and 104 were in use by 1733, eventually over two thousand of them were installed.
In1781 Scottish engineer James Watt patented a steam engine that produced continuous rotary motion. Watt's ten-horsepower engines enabled a wide range of manufacturing machinery to be powered. The engines could be sited anywhere that water and coal or wood fuel could be obtained.
