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

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Questions
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)

Physical World MCQs

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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