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

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Free download in PDF Class 11 Physics Chapter 1 Physical World and Measurement Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 11 Physics with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries. These will help the students for preparation of their examination./p>

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(1) 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.
(2) Physics is a
[A] Applied Science
[B] Mathematical Science
[C] Engineering Science
[D] Natural Science
Answer: Natural Science

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(3) Atomic and molecular phenomena are dealt with by
[A] Newtonian Mechanics
[B] fluid Mechanics
[C] applied Mechanics
[D] Quantum Mechanics
Answer: Quantum Mechanics
(4) 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
(5) 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
(6) 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
(7) 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
(8) 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
(9) 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
(10) 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…
(11) 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
(12) Following are the readings obtained while measuring the diameter of a wire by using the screw gauge0 mm is the main scale reading 52 divisions are the circular scale reading. What is the diameter of the wire if 1 mm on the main scale is equal to the 100 divisions on the circular scale
[A] 0.016 cm
[B] 0.052 cm
[C] 0.15 cm
[D] 0.05 cm
Answer: 0.052 cm
(13) From the given three fundamental constants, select the combination that gives the dimension of length

(i) Newton’s gravitational constant (G)

(ii) Speed of light in a vacuum (c)

(iii) Planck’s constant (h)

[A] (a)
[B] (b)
[C] (c)
[D] (d)
Answer: (d)
(14) Calculate the value of the dot product of the two vectors whose magnitudes are 3 units and 4 units and their resultant is 1 unit.
[A] +6 units
[B] 0
[C] -12 units
[D] -1 unit
Answer: -12 units
(15) Which the following is a dimensionless quantity
[A] Refractive index
[B] Gravitational constant
[C] Velocity
[D] Planck’s constant
Answer: Refractive index
(16) Identify the physical parameters that are having the same dimensions from the below-given list:

(i) Magnetic field

(ii) Energy density

(iii) Refractive index

(iv) Young’s modulus

(v) Dielectric constant

[A] (ii) and (iv)
[B] (i) and (v)
[C] (iii) and (iv)
[D] (iv) and (iii)
Answer: (ii) and (iv)
(17) Find the relative error of y, if y=x2
[A] △x/x
[B] 2△x/x
[C] (△x)2x
[D] (△x)2
Answer: 2△x/x
(18) What is the dimensional formula of torque and energy
[A] [ML-3T-2] and [MLT-2]
[B] [ML2T-2] and [MLT-2]
[C] [ML2T-2] and [ML2T2]
[D] [MLT2] and [ML2T2]
Answer: [ML2T-2] and [ML2T2]
(19) What is the percentage error in the measurement of the kinetic energy of a body, if there is a positive error of 50% in the speed of the body
[A] 125%
[B] 30%
[C] 50%
[D] 100%
Answer: 100%
(20) How many numbers of base SI units are there?
[A] 5
[B] 10
[C] 7
[D] 9
Answer: 7

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