CBSE Class 11 Physics Physical World MCQs Set B

Question: Prof. Albert Einstein got nobel prize in physics for his work on
a) special theory of relativity
b) general theory of relativity
c) photoelectric effect
d) theory of specific heats
Answer: c

Question: In the relation P = α /β e^αz/kΘ where P is pressure, Z is distance, k is Boltzmann constants and q is the temperature. The dimensional formula of b will be
a) [M⁰L²T⁰]
b) [M¹L²T¹]
c) [M¹L⁰T^–1]
d) [M⁰L²T^–1]
Answer: a

Question: A student measuring the diameter of a pencil of circular cross-section with the help of a vernier scale records the following four readings 5.50 mm, 5.55 mm, 5.45 mm, 5.65 mm, The average of these four reading is 5.5375 mm and the standard deviation of the data is 0.07395 mm. The average diameter of the pencil should therefore be recorded as :
a) (5.5375 ± 0.0739) mm
b) (5.5375 ± 0.0740) mm
c) (5.538 ± 0.074) mm
d) (5.54 ± 0.07) mm
Answer: d

Question: A scientific way of doing things involve
a) identifying the problem
b) collecting data
c) hypothesising a possible theory
d) All of the options
Answer: d

Question: The man who is known as the Father of Experimental Physics is
a) Newton
b) Albert Einstein
c) Galileo
d) Rutherford
Answer: c

Question: Force F is given in terms of time t and distance x by F = A sin (Ct) + B cos (Dx). Then, dimensions of A/B and C/D are
a) [M⁰ L⁰ T⁰], [M⁰ L⁰ T^–1]
b) [M L T^–2], [M⁰ L^–1 T⁰]
c) [M⁰ L⁰ T⁰], [M⁰ L T^–1]
d) [M⁰ L¹ T^–1], [M⁰ L⁰ T⁰]
Answer: c

Question: Madam Marie Curie won Nobel Prize twice which were in the field of
a) Physics and chemistry
b) Chemistry only
c) Physics only
d) Biology only
Answer: a

Question: The branch of science which deals with nature and natural phenomena is called
a) Sociology
b) Biology
c) Civics
d) Physics
Answer: d

Question: Which of the following is wrongly matched ?
a) Barometer-Pressure
b) Lactometer-Milk
c) Coulomb’s law-charges
d) Humidity-Calorimeter
Answer: d

Question: Write the dimensions of a × b in the relation E = b – x² /at where E is the energy, x is the displacement and t is time
a) ML²T
b) M^–1L²T¹
c) ML²T^–2
d) MLT^–2
Answer: b

Question: The relative error in the determination of the surface area of a sphere is a. Then the relative error in the determination of its volume is
a) 2/3 α
(b 2/3 α
c) 3/2 α
d) α
Answer: c

Question: 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: d

Question: In SI units, the dimensions of √∈0 /μ0 is:
a) A^–1TML³
b) AT² M^–1L^–1
c) AT^–3ML³/2
d) A²T³ M^–1L^–2
Answer: d

Question: The respective number of significant figures for the numbers 23.023, 0.0003 and 2.1 × 10^–3 are
a) 5, 1, 2
b) 5, 1, 5
c) 5, 5, 2
d) 4, 4, 2
Answer: a

Question: Louis de-Broglie is credited for his work on
a) theory of relativity
b) electromagnetic theory
c) matter waves
d) law of distribution of velocities
Answer: c

Question: Which of the following is the weakest force?
a) Nuclear force
b) Gravitational force
c) Electromagnetic force
d) None of the options
Answer: b

Question: Which of the following is the correct decreasing order of the strengths of four fundamental forces of nature ?
a) Electromagnetic force > weak nuclear force > gravitational force > strong nuclear force
b) Strong nuclear force > weak nuclear force > electromagnetic force > gravitational force
c) Gravitational force > electromagnetic force > strong nuclear force > weak nuclear force
d) Strong nuclear force > electromagnetic force > weak nuclear force > gravitational force
Answer: d

Question: A quantity x is given by (IFv²/WL⁴) in terms of moment of inertia I, force F, velocity v, work W and Length L. The dimensional formula for x is same as that of :
a) planck’s constant
b) force constant
c) energy density
d) coefficient of viscosity
Answer: c

Question: 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: a

Question: In a new system of units, the fundamental quantities mass, length and time are replaced by acceleration ‘a’, density ‘r’ and frequency ‘f’.
The dimensional formula for force in this system is
a) [ρa⁴ f ]
b) [ρa⁴ f^–6]
c) [ρ^–1a^–4f⁶]
d) [ρ^–1a^–4 f^–1]
Answer: b

Question: The man who has won Nobel Prize twice in physics is
a) Einstein
b) Bardeen
c) Heisenberg
d) Faraday
Answer: b

Question: Macroscopic domain includes
a) phenomena at the laboratory
b) terrestrial scales
c) astronomical scales
d) All of the options
Answer: d

Question: The pair of physical quantities that has the different dimensions is :
a) Reynolds number and coefficient of friction
b) Curie and frequency of a light wave
c) Latent heat and gravitational potential
d) Planck’s constant and torque
Answer: d

Question: 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: b

Question: Who discovered X-rays?
a) Chadwick
b) Roentgen
c) Thomson
d) Madam Curie
Answer: b

Question: When we hold a book in our hand, we are balancing the gravitational force on the book due to
a) normal force provided by our hand
b) friction force provided by our book
c) both normal force provided by our hand and friction force provided by our book
d) None of the options
Answer: a

Question: Which of the following has infinite range?
a) Gravitational force
b) Electromagnetic force
c) Strong nuclear force
d) Both Gravitational force and Electromagnetic force
Answer: d

Question: The field of work of S. Chandrashekar is
a) theory of black hole
b) Cosmic rays
c) theory of relativity
d) X-rays
Answer: a

Question: N divisions on the main scale of a vernier calliper coincide with (N + 1) divisions of the vernier scale.
If each division of main scale is ‘a’ units, then the least count of the instrument is
a) a
b) a/N
c) N/ N+ 1 x a
d) a / N+1
Answer: d

Question: C.V. Raman got Nobel Prize for his experiment on
a) dispersion of light
b) reflection of light
c) deflection of light
d) scattering of light
Answer: d

Question: The exchange particles for the electromagnetic force are
a) gravitons
b) gluons
c) photons
d) mesons
Answer: c

Question: From the following combinations of physical constants (expressed through their usual symbols) the only combination, that would have the same value in different systems of units, is:
a) ch / 2πε₀²
b) e2 / 2πε₀ Gme² (me = mass of electron)
c) μ₀ε₀ / c² x G /he²
d) 2π √μ₀ε₀ /ce² x h/G
Answer: b

Question: In the formula X = 5YZ2, X and Z have dimensions of capacitance and magnetic field, respectively. What are the dimensions of Y in SI units ?
a) [M^–3 L^–2 T⁸ A⁴]
b) [M^–1L^–2T⁴ A²]
c) [M^–2 L⁰ T^–4 A^–2]
d) [M^–2L^–2T⁶ A³]
Answer: a

Question: A metal sample carrying a current along X-axis with density Jx is subjected to a magnetic field Bz (along z-axis). The electric field Ey developed along Y-axis is directly proportional to Jx as well as Bz.
The constant of proportionality has SI unit.
a) M² /A
b) M³ /AS
c) m² /As
d) AS / M³
Answer: b

Question: The period of revolution (T) of a planet moving round the sun in a circular orbit depends upon the radius (r) of the orbit, mass (M) of the sun and the gravitation constant (G). Then T is proportional to
a) r_1/2
b) r
c) r^3/2
d) r²
Answer: c

Question: The refractive index of water measured by the relation m = real depth / apparent depth is found to have values of 1.34, 1.38, 1.32 and 1.36; the mean value of refractive index with percentage error is
a) 1.35 ± 1.48 %
b) 1.35 ± 0 %
c) 1.36 ± 6 %
d) 1.36 ± 0 %
Answer: a

Question: In an experiment the angles are required to be measured using an instrument, 29 divisions of the main scale exactly coincide with the 30 divisions of the vernier scale. If the smallest division of the main scale is half- a degree (= 0.5°), then the least count of the instrument is:
a) half minute
b) one degree
c) half degree
d) one minute
Answer: d

Question: Who gave general theory of relativity?
a) Einstein
b) Marconi
c) Ampere
d) Newton
Answer: a

Question: Given that K = energy, V = velocity, T = time. If they are chosen as the fundamental units, then what is dimensional formula for surface tension?
a) [KV^–2T^–2]
b) [K²V²T^–2]
c) [K²V^–2T^–2]
d) [KV²T²]
Answer: a

Question: If x = at + bt², where x is the distance travelled by the body in kilometers while t is the time in seconds, then the unit of b is
a) km/s
b) kms
c) km/s²
d) kms²
Answer: c

Question: 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 They deal with non-living things and The study of matter are conducted at atomic or ionic levels
d) None of the options
Answer: c

Question: Two Indian born physicists who have been awarded Nobel Prize in Physics are
a) H. J. Bhabha and APJ Kalam
b) C.V. Raman and S. Chandrasekhar
c) J.C. Bose and M.N. Saha
d) S. N. Bose and H. J. Bhabha
Answer: b

Question: 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: a

Question: Which of the following statements is/are correct?
I. Strong nuclear force binds protons and neutrons in a nucleus.
II. In twentieth century, silicon chip triggered a revolutionary changes in technology of computer system.
III. The fossil fuels of the planet are dwindling fast and there is urgent need to discover new source of energy.
a) Only I
b) Only III
c) I and II
d) I, II and III
Answer: d

Question: Match the Column I and Column II.
     Column I                                      Column II
a) Johannes Kepler                      (1) Nuclear model of the atom
b) Tycho Brahe                             (2) Planetary motion
c) Nicolas Copernicus                  (3) Elliptical orbit theory
d) Ernest Rutherford (4) Circular orbit theory
a) (a)→(2);( b)→(4); C→(3); (d)→(1)
b) (a)→(1); (b)→(2); C→(3); (d)→(4)
c) (a)→(2); (b)→(1); C→(4); (d)→(3)
d) (a)→(3); (b)→(2); C→(4); (d)→(1)
Answer: a

Question:
   Column I                          Column II
a) Galileo Galilei            (1) Explanation of photoelectric effect.
b) JC Bose                     (2) Law of inertia.
c) Albert Einstein            (3) Discovery of Ultra short radio waves.
d) JJ Thomson               (4) Discovery of electron
a) (a)→(2); (b)→(3); C→(1); (d)→(4)
b) (a)→(1); (b)→(2); C→(4); (d)→(3)
c) (a)→(1); (b)→(2); C→(3); (d)→(4)
d) (a)→(3); (b)→(4); C→(1); (d)→(2)
Answer: a

Question:
    Column I                                Column II
a) J.C Maxwell                         (1) Verified experimentally the prediction of electromagnetic force.
b) Cario Rubia                         (2) Unified electricity,magnetism and optics, showed that light is an EM waves.
c) Isaac Newton                      (3) Unified celestial and terrestrial mechanics.
d) Michael Faraday                 (4) Showed that electric and magnetic phenomenon i.e., electromagnetism.
a) (a)→(1); (b)→(2); C→(4); (d)→(3)
b) (a)→(2); (b)→(1); C→(3); (d)→(4)
c) (a)→(2); (b)→(3); C→(4); (d)→(1)
d) (a)→(2); (b)→(1); C→(4); (d)→(3)
Answer: b