Why mcqs of class 11 Physics lesson 1 Physical world is important ?
- these mcqs are important because these questions cover a wide topic of the chapter
- mcqs are easy to understand
- mcqs break the big topic in some small topic so they are easy to learn
- they give a short revision at the time of class 11 Physics exam
How to get pdf of class 11 Physics lesson 1 Physical world mcqs
Increasing role of mcqs in board exam
CLASS 11 Physics LESSON 1 Physical world OBJECTIVE QUESTIONS MCQ'S TEST
1. Physics is a
Applied Science
Natural Science
Engineering Science
Mathematical Science
ANSWER - B
EXPLANATION - The natural sciences seek to understand how the world and universe around us works. There are five major branches: Chemistry, astronomy, earth science, physics, and biology.
2. The word "Science" originates from the Latin verb Scientia meaning
to know
to observe
to see
to experience
ANSWER - A
EXPLANATION - The phrase "scientia potentia est" (or "scientia est potentia" or also "scientia potestas est") is a Latin aphorism meaning "knowledge is power"
3. The scientific method is
a body of techniques for investigating phenomena, acquiring new knowledge.
a prescribed method for investigating phenomena, acquiring new knowledge.
a method for proposing new theories.
a procedure for proposing new hypotheses
ANSWER - A
EXPLANATION - The scientific method is a body of techniques for investigating phenomena, acquiring new knowledge, or correcting and integrating previous knowledge. To be termed scientific, a method of inquiry is commonly based on empirical or measurable evidence subject to specific principles of reasoning.
4. Which of the following is a possible first step in applying the scientific method?
Formulation of a question
Conducting tests
Formulating a hypothesis
Building a theory
ANSWER - A
EXPLANATION - The scientific method starts when you ask a question about something that you observe.
5. Which of the following is a possible final step in applying the scientific method?
Analysis of test results
Building a theory
Formulation of a question
Formulating a hypothesis
ANSWER - A
EXPLANATION - Your experiment tests whether your prediction is accurate and thus your hypothesis is supported or not, it is important for your experiment to be a fair test. You should also repeat your experiments several times to make sure that the first results weren't just an accident.
6. A scientific theory is accepted if
the theory is derivable from other theories logically.
The theory is approved by a panel of people after studying the theory only.
predictions of the theory are confirmed by experiments.
The theory is very simple, elegant or very complicated.
ANSWER - C
EXPLANATION - A scientific theory is an explanation of some aspect of the natural world that can, in accordance with the scientific method, be repeatedly tested, using a predefined protocol of observations and experiments.
7. A scientific theory
cannot be changed but can be reformulated
is fixed once and for all because it is logical
can be revised if required to fit new phenomenon or data
is changed to suit new fashion among scientists
ANSWER - C
EXPLANATION - A scientific theory is not the end result of the scientific method; theories can be proven or rejected, just like hypotheses. Theories can be improved or modified as more information is gathered so that the accuracy of the prediction becomes greater over time.
8. Heliocentric theory proposed by Nicolas Copernicus was
replaced by elliptical orbits to fit the data better.
replaced by circular orbits to fit the data better.
replaced by parabolic orbits to fit the data better.
replaced by elliptical orbits to fit the taste of new rulers of Italy.
ANSWER - A
EXPLANATION - Copernican heliocentrism is the name given to the astronomical model developed by Nicolaus Copernicus and published in 1543. It positioned the Sun near the center of the universe, motionless, with Earth and the other planets rotating around it in circular paths modified by epicycles and at uniform speeds.
This theory was replaced by Kepler. All planets move in elliptical orbits, with the sun at one focus. This is one of Kepler's laws. The elliptical shape of the orbit is a result of the inverse square force of gravity. The eccentricity of the ellipse is greatly exaggerated here.
9. Newtonian mechanics could not explain
fall of bodies on earth.
movement of planets.
some of the most basic features of atomic phenomena.
flight of rockets.
ANSWER - C
EXPLANATION - When science progressed into the realm of the microscopic (of dimensions the size of an atom) world i.e. less than a nanometer, it was observed that Newtonian mechanics and classical electrodynamics were in contradiction with experiments.
10. Wave pictures of light failed to explain_________________.
interference of light
polarization of light
the photoelectric effect
diffraction of light
ANSWER - C
EXPLANATION - The photoelectric effect cannot be explained according to wave theory because of the following reasons:
1. According to wave theory, after the light falls on a substance electrons are emitted after a small instant of time. However, in the photoelectric effect, the electron emissions are immediate without a time delay.
2. The energy of a wave increases with an increase in intensity. However, in the photoelectric effect, an increase in intensity has no effect on the energy of electrons emitted. All that happens is the number of electrons emitted increases.
11. Atomic and molecular phenomena are dealt with by
Quantum Mechanics
Newtonian Mechanics
Applied Mechanics
Fluid Mechanics
ANSWER - A
EXPLANATION - Quantum mechanics is a physical science dealing with the behaviour of matter and energy on the scale of atoms and subatomic particles / waves.
12. Just as a new experiment may suggest an alternative theoretical model, a theoretical advance may suggest what to look for in some experiments. Which of the following experiments can be considered to support this claim?
Experimental discovery of the positron
Gold foil experiment
Davisson and Germer Experiment
Michelson Morley experiment
ANSWER - A
EXPLANATION - Carl David Anderson discovered the positron on August 2, 1932, for which he won the Nobel Prize for Physics in 1936. The positron was the first evidence of antimatter and was discovered when Anderson allowed cosmic rays to pass through a cloud chamber and a lead plate.
13. In Physics, we attempt to explain
diverse physical phenomena in terms of logic.
diverse physical phenomena in terms of a large number of concepts and laws.
diverse physica phenomena in terms of a few concepts and laws.
diverse physical phenomena in terms of Einstein’s and Newton’s laws.
ANSWER - B
EXPLANATION - Physics, the study of matter and energy, is an ancient and broad field of science. In general, the field aims to analyze and understand the natural phenomena of the universe.
14. Reductionism is:
reducing all phenomena to logical consequences of Einstein’s laws.
reducing all phenomena to logical consequences of Newton’s laws
deriving the properties of a bigger, more complex, system from first principles.
deriving the properties of a bigger, more complex, system from the properties and interactions of its constituent simpler parts.
ANSWER - D
EXPLANATION - Reductionism is breaking down a complex system into simple constituent systems so that laws of physics can be applied to these systems and we can understand the working of the complex system.
15. Classical Physics deals mainly with_________________.
microscopic phenomena
surface phenomena
macroscopic phenomena
transport phenomena
ANSWER - C
EXPLANATION - Classical physics is the study of motion, projectiles, pulleys, and the planets. It mainly deals with the movement of large objects (macroscopic) through space at relatively low slow speeds.
PDF OF THESE QUESTIONS