NCERT Solutions for class 11 Physics | Chapter 1 - Physical World And Measurement

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Questions
1 Consider the following statements and select the correct statement(s).

I. Optics deal with the phenomena involving light.

II. Unification means physical phenomena in terms of few concepts and laws.

III. Macroscopic domain of Physics deals with the constitution and structure of matter at the minute scales of atoms and nuclei.

A Only I
B Only II
C I and II
D II and III

Answer:Only I
2 The scientific principle involves in production of ultra high magnetic fields is
A super conductivity
B digital logic
C photoelectric effect
D laws of thermodynamics

Answer:super conductivity
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3 Which of the following is true regarding the physical science?
A They deal with non-living things
B The study of matter are conducted at atomic or ionic levels
C Both (a) and (b)
D None of these

Answer:Both (a) and (b)
4 Assertion : The concept of energy is central to Physics and expression for energy can be written for every physical system.

Reason : Law of conservation of energy is not valid for all forces and for any kind of transformation between different forms of energy.

A Assertion is correct, reason is correct; reason is a correct explanation for assertion.
B Assertion is correct, reason is correct; reason is not a correct explanation for assertion
C Assertion is correct, reason is incorrect
D Assertion is incorrect, reason is correct.

Answer:Assertion is correct, reason is incorrect
5 The branch of science which deals with nature and natural phenomena is called
A Sociology
B Biology
C Civics
D Physics

Answer:Physics
6 Macroscopic domain includes
A phenomena at the laboratory
B terrestrial scales
C astronomical scales
D All of the above

Answer:All of the above
7 The man who is known as the Father of Experimental Physics is
A Newton
B Albert Einstein
C Galileo
D Rutherford

Answer:Galileo
8 The person who has been awarded the title of the Father of Physics of 20th century is
A Madame Curie
B Sir C.V. Raman
C Neils Bohar
D Albert Einstein

Answer:Albert Einstein
9 Science is exploring, ...x... and ...y... from what we see around us. Here, x and y refer to
A qualitative, modify
B experiment, predict
C verification, predict
D reasoning, quantitative

Answer:experiment, predict
10 The word Science originates from the Latin verb Scientia meaning
A to know
B to see
C to experience
D to observe

Answer:to know
11 Which of the following is a possible first step in applying the scientific method
A Conducting tests
B Formulating a hypothesis
C Formulation of a question
D Building a theory

Answer:Formulation of a question
12 A scientific theory
A cannot be changed but can be reformulated
B is fixed once and for all because it is logical
C is changed to suit new fashion among scientists
D can be revised if required to fit new phenomenon or data

Answer:can be revised if required to fit new phenomenon or data
13 Just as a new experiment may suggest an alternative theoretical model, a theoretical advance may suggest what to look for in some for in some experiments. Which of the following experiments can be considered to support this claim?
A Davisson and Germer Experiment
B experimental discovery of positron
C scattering of alpha particle or the gold foil experiment
D Michelson Morley experiment

Answer:experimental discovery of positron
14 Newtonian mechanics could not explain
A fall of bodies on earth
B Some of the most basic features of atomic phenomena.
C movement of planets
D flight of rockets

Answer:Some of the most basic features of atomic phenomena.
15 Wave picture of light failed to explain.
A the photoelectric effect
B polarization of light
C diffraction of light
D interference of light

Answer:the photoelectric effect
16 Atomic and molecular phenomena are dealt with by
A Newtonian Mechanics
B fluid Mechanics
C applied Mechanics
D Quantum Mechanics

Answer:Quantum Mechanics
17 The scientific method is
A a prescribed method for investigating phenomena, acquiring new knowledge
B A procedure for proposing new hypothesis
C a body of techniques for investigating phenomena, acquiring new knowledge
D A method for proposing new theories.

Answer:a body of techniques for investigating phenomena, acquiring new knowledge
18 Heliocentric theory proposed by Nicolas Copernicus was
A replaced by circular orbits to fit the data better
B replaced by elliptical orbits to fit the data better
C replaced by elliptical orbits to fit the taste of new rulers of Italy
D replaced by parabolic orbits to fit the data better

Answer:replaced by elliptical orbits to fit the data better
19 Which of the following is a possible final step in applying the scientific method
A Formulating a hypothesis
B Building a theory
C Analysis of test results
D Formulation of a question

Answer:Analysis of test results
20 A screw gauge with a pitch of 0.5 mm and a circular scale with 50 divisions is used to measure the thickness of a thin sheet of Aluminium. Before starting the measurement, it is found that when the two jaws of the screw gauge are brought in contact, the 45th division coincides with the main scale line and that the zero of the main scale is barely visible. What is the thickness of the sheet if the main scale reading is 0.5 mm and the 25th division coincides with the main scale line?
A 0.80 mm
B 0.70 mm
C 0.50 mm
D 0.75 mm

Answer:0.80 mm

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