This quiz works best with JavaScript enabled. Home > Cbse > Class 11 > Science > Physics Part I > Class 11 Physics (Part I) Chapter 1 Physical World And Measurement – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Physics (Part I) Chapter 1 Physical World And Measurement Quiz 1 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Radioactivity was discovered by A) Roentgen. B) Becquerel. C) Rutherford. D) Chadwick. Show Answer Correct Answer: B) Becquerel. 2. The value of one angstrom is ..... A) (10 $^{-30}$) m. B) (10 $^{-20}$) m. C) (10$^{-10}$) m. D) (10 $^{-40}$)m. Show Answer Correct Answer: C) (10$^{-10}$) m. 3. Round off the following numbers as indicated {A} 19.45 upto 3 digits {B} 248337 up to 3 digits A) 19.3 b) 248300. B) 19.3 b) 248300. C) 19.4 b) 248300. D) 19.4 b) 248000. Show Answer Correct Answer: D) 19.4 b) 248000. 4. Gross error can be minimised by A) Taking mean. B) Repeating the experiment. C) Careful observation. D) None of the above. Show Answer Correct Answer: C) Careful observation. 5. The dimensional formula for magnetic flux is A) [ML$^{2}$T$^{-2 A-1}$]. B) [ML$^{2}$T$^{-1 A2}$]. C) [M$^{0}$L$^{2}$T$^{-2 A-2}$]. D) [ML3T$^{-2 A-2}$]. Show Answer Correct Answer: A) [ML$^{2}$T$^{-2 A-1}$]. 6. The density of a material in CGS system of units is 4 g cm $^{-3}$. In a system of units in which unit of length is 10 cm and unit of mass is 100 g, then the value of density of material will be A) 0.4. B) 0.04. C) 40. D) 400. Show Answer Correct Answer: C) 40. 7. The number of significant figures in 600 m is A) 2. B) 3. C) 4. D) 1. Show Answer Correct Answer: B) 3. 8. What is the unit of Planck's constant? A) J s. B) J s $^{2}$. C) J /s$^{ 2}$. D) J /s. Show Answer Correct Answer: A) J s. 9. The length of a body is measured as 3.51 m, if the accuracy is 0.01m, then the percentage error in the measurement is A) 0.28%. B) 1%. C) 0. 035 %. D) 351%. Show Answer Correct Answer: A) 0.28%. 10. Which of the following is a possible first step in applying the scientific method A) Formulation of a question. B) Building a theory. C) Formulating a hypothesis. D) Conducting tests. Show Answer Correct Answer: A) Formulation of a question. 11. A student measures the thickness of a human hair by looking at it through a microscope of magnification 100. He makes 20 observations and, finds that the average width of the hair in the field of view of the microscope is 3.5 mm. What is the estimate of the thickness of the hair? A) 0.035 mm. B) 0.0035 mm. C) 0.025 mm. D) 0.07 mm. Show Answer Correct Answer: A) 0.035 mm. 12. With due regard for significant figures, (12.5)$^{2}$ = A) 156. B) 156.25. C) 156.2. D) 156.250. Show Answer Correct Answer: A) 156. 13. Light year is the unit of A) Time. B) Velocity. C) Intensity of light. D) Distance. Show Answer Correct Answer: D) Distance. 14. The symbol for tera is ..... A) T. B) E. C) A. D) R. Show Answer Correct Answer: A) T. 15. Which method is used to find the distance between the Earth and the Sun? A) Triangulation method. B) Parallax method. C) RADAR method. D) None of the above. Show Answer Correct Answer: B) Parallax method. 16. For detecting submarines under water SONAR makes use of: A) Laser beams. B) Radio waves. C) Ultrasonic wave. D) None of these. Show Answer Correct Answer: C) Ultrasonic wave. 17. What is the SI unit of weight? A) Grams. B) Kg. C) Newtons. D) Kilograms. Show Answer Correct Answer: C) Newtons. 18. What is the value of mass of known observable universe? A) 10 $^{ 48}$ kg. B) 10 $^{45 }$kg. C) 10 $^{53}$ kg. D) 10 $^{55}$ kg. Show Answer Correct Answer: D) 10 $^{55}$ kg. 19. "The most incomprehensible thing about the world is that it is comprehensible." This statement was made by the scientist A) Newton. B) Aristotle. C) Galileo. D) Einstein. Show Answer Correct Answer: D) Einstein. 20. 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). Show Answer Correct Answer: A) (ii) and (iv). 21. The dimensional formula for gravitational constant G is ..... A) [M$^{-1}$L$^{-3 }$T$^{-2}$]. B) [M$^{-1}$L$^{3 }$T$^{-2}$]. C) [ML$^{-3}$ T$^{2}$ ]. D) [ML$^{3}$ T$^{-2}$ ]. Show Answer Correct Answer: B) [M$^{-1}$L$^{3 }$T$^{-2}$]. 22. Length cannot be measured by A) Light year. B) Fermi. C) Micron. D) Debye. Show Answer Correct Answer: D) Debye. 23. If the force is proportional to square of velocity, then the dimension of proportionality constant is? A) [ML$^{-2}$T ]. B) [ML$^{-1}$T$^{0}$ ]. C) [MLT $^{-1}$]. D) [MLT $^{0 }$]. Show Answer Correct Answer: B) [ML$^{-1}$T$^{0}$ ]. 24. In a vernier callipers N divisions of vernier scale coincide with N-1 divisions of main scale ( in which length of one division is 1mm). The least count of the instrument should be A) 1/(N-1). B) 1/10N. C) N. D) N-1. Show Answer Correct Answer: B) 1/10N. 25. Following are the readings obtained while measuring the diameter of a wire by using the screw gauge0 mm is the main scale reading52 divisions are the circular scale readingWhat is the diameter of the wire if 1 mm on the main scale is equal to the 100 divisions on the circular scale A) 0.15 cm. B) 0.052 cm. C) 0.016 cm. D) 0.05 cm. Show Answer Correct Answer: B) 0.052 cm. 26. If the uncertainty in the volume of a solid sphere is 6%, then the uncertainty in the surface area of the sphere is: A) 12%. B) 4%. C) 6%. D) 2%. Show Answer Correct Answer: B) 4%. 27. The dimensions of universal gravitational constant are A) [M$^{-2}$L$^{3}$ T$^{-2}$]. B) [M$^{-1}$L$^{3}$ T$^{-2}$]. C) [ML$^{2}$ T$^{-1}$]. D) [M$^{-2}$L2 T$^{-1}$]. Show Answer Correct Answer: B) [M$^{-1}$L$^{3}$ T$^{-2}$]. 28. What is the dimensional formula of torque? A) [ML$^{2}$T$^{-2}$]. B) [ML$^{-3}$T$^{-2}$]. C) [MLT$^{2}$]. D) [ML$^{2}$T$^{-2}$]. Show Answer Correct Answer: A) [ML$^{2}$T$^{-2}$]. 29. The velocity of a particle v at an instant t is given by v=at+bt2. The dimensions of b is A) [LT$^{-2}$]. B) [LT$^{-1}$]. C) [LT$^{-3}$]. D) [L]. Show Answer Correct Answer: C) [LT$^{-3}$]. 30. 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) 30 %. B) 100 %. C) 50 %. D) 125 %. Show Answer Correct Answer: B) 100 %. 31. The Density of a cube is measured by measuring its mass and length of its sides if the maximum error in the measurement of mass and length are 4% and 3% respectively, the maximum error in the measurement of density will be A) 9%. B) 7%. C) 13%. D) 12%. Show Answer Correct Answer: C) 13%. 32. Which is the correct unit for measuring astronomical distance? A) Angstrom. B) Light year. C) Mole. D) Kilometer. Show Answer Correct Answer: B) Light year. 33. The numer of significant figures in 0.086230 is A) 4. B) 5. C) 6. D) None of the above. Show Answer Correct Answer: B) 5. 34. Which of the following has the highest number of significant figures? A) 6.3200 J. B) 0.007 m$^{2}$. C) 0.0006032 m $^{2}$. D) 2.64 x 10 $^{24}$ kg. Show Answer Correct Answer: A) 6.3200 J. 35. One nanometer is equal to A) 10$^{-9}$ m. B) 10$^{-6}$ cm. C) 10$^{9}$ mm. D) 10$^{-7}$ cm. Show Answer Correct Answer: A) 10$^{-9}$ m. 36. The vernier of a circular scale is divided into 30 divisions which coincides against 29 main scale divisions. Each main scale divisions is 1/2$^{0}$ The least count of the instrument is A) 30'. B) 1'. C) 0.1'. D) 10'. Show Answer Correct Answer: B) 1'. 37. The ratio of the height of a man to the radius of the earth is of the order of A) 10$^{-3}$. B) 10$^{-9}$. C) 10$^{-7}$. D) 10$^{-5}$. Show Answer Correct Answer: C) 10$^{-7}$. 38. One of the combinations from the fundamental physical constants is hc/G. The unit of this expression is ..... A) S $^{-1}$. B) Kg$^{2}$. C) M. D) M$^{3}$. Show Answer Correct Answer: B) Kg$^{2}$. 39. If force (F), velocity (v) and time (T) are taken as fundamental units, then the dimensions of mass are A) [Fv$^{-1}$T]. B) [FvT$^{-2}$]. C) [Fv$^{-1}$T$^{-1}$]. D) [FvT$^{-1}$]. Show Answer Correct Answer: A) [Fv$^{-1}$T]. 40. Which of the following measurements is most precise? A) 15.00 m. B) 15.00 km. C) 15.00 cm. D) 15.00 mm. Show Answer Correct Answer: D) 15.00 mm. 41. The Percentage errors in the measurement of mass and speed are 2% and 3% respectively, The error in kinetic energy obtained by measuring mass and speed will be A) 10%. B) 2%. C) 12%. D) 8%. Show Answer Correct Answer: D) 8%. 42. Atomic and molecular phenomena are dealt with by A) Applied Mechanics. B) Fluid Mechanics. C) Newtonian Mechanics. D) Quantum Mechanics. Show Answer Correct Answer: D) Quantum Mechanics. 43. Round off the number 43.752 upto three digit A) 43.8. B) 43.7. C) 43.76. D) None of the above. Show Answer Correct Answer: A) 43.8. 44. A supposition that is put forward as a probable solution to a natural phenomenon is called a A) Theory. B) Hypothesis. C) Relief. D) Law. Show Answer Correct Answer: B) Hypothesis. 45. Which of the following is a dimensional constant? A) Refractive index. B) Relative density. C) Gravitational constant. D) Poisson's ratio. Show Answer Correct Answer: C) Gravitational constant. 46. 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. Show Answer Correct Answer: C) A body of techniques for investigating phenomena, acquiring new knowledge . 47. The Velocity v of a particle at time t is given by v = at+ b/t+c, where a, b, and c are constants. The dimensions of a, b, and c are respectively A) [LT$^{-2}$]. [L] and [T]. B) [L$^{2}$]. [T] and [LT$^{2}$]. C) [LT$^{2}$], [LT] and [L]. D) [L], [LT] and [LT$^{2}$]. Show Answer Correct Answer: A) [LT$^{-2}$]. [L] and [T]. 48. If C and R denote capacitance and resistance respectively, then the dimensional formula of CR is A) [M$^{0}$L$^{0}$T$^{0}$]. B) [M$^{0}$L$^{0}$T]. C) Not expressible i terms of [MLT]. D) [M$^{0}$L$^{0}$T$^{-1}$]. Show Answer Correct Answer: B) [M$^{0}$L$^{0}$T]. 49. Which of the following quantities is expressed as force per unit area? A) Area. B) Work. C) Pressure. D) Volume. Show Answer Correct Answer: C) Pressure. 50. If L = 2.331 cm, B = 2.1 cm, then L + B =? A) 4.431 cm. B) 4.43 cm. C) 4 cm. D) 4.4 cm. Show Answer Correct Answer: D) 4.4 cm. 51. 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. Show Answer Correct Answer: B) Some of the most basic features of atomic phenomena. 52. Wave picture of light failed to explain. A) Polarization of light. B) Diffraction of light. C) The photoelectric effect. D) Interference of light. Show Answer Correct Answer: C) The photoelectric effect. 53. If the length and time period of an oscillating pendulum have errors of 1% and 3% respectively then the error in measurement of acceleration due to gravity A) 4%. B) 7%. C) 6%. D) 5%. Show Answer Correct Answer: B) 7%. 54. "The most incomprehensible thing about the world is that it is comprehensible." Who said so: A) Newton. B) Einstein. C) Copernicus. D) Chadwick. Show Answer Correct Answer: C) Copernicus. 55. If dimension of critical velocity v$_{c}$ of a liquid flowing through a tube are expressed as [n$^{x }$p$^{y }$r$^{z}$], where n p and r are the coefficient of viscosity of liquid density of liquid and radius of the tube respectively, then the values of x, y and z are given by A) -1, -1, -1. B) 1, 1, 1. C) -1, -1, 1. D) 1, -1, -1. Show Answer Correct Answer: D) 1, -1, -1. 56. What is the dimensional formula of torque and energy A) $[ML^{-3}T^{-2}]and[MLT^{-2}]$. B) $[ML^2T^{-2}]and[MLT^{-2}]$. C) $[ML^2T^{-2}]and[ML^2T^2]$. D) $[MLT^2]and[ML^2T^2]$. Show Answer Correct Answer: C) $[ML^2T^{-2}]and[ML^2T^2]$. 57. A new unit of length is chosen such that the speed of light in a vacuum is unity. What is the distance between the Sun and the Earth in terms of the new unit if light takes 8 min and 20 s to cover this distance? A) 500 new units. B) 160 new units. C) 1000 new units. D) 750 new units. Show Answer Correct Answer: A) 500 new units. 58. In a particular system, the unit of length mass and time are chosen to be 10cm, 10 g and 0.1 s respectively. The unit of force in this system will be equivalent to A) 10 N. B) 1 N. C) 0.1 N. D) 100 N. Show Answer Correct Answer: C) 0.1 N. 59. The Dimensional formula for permeability of free space, $\mu$$_{0}$ is A) [MLT$^{-2}$A$^{-1}$]. B) [ML$^{-1}$T$^{-2}$A$^{2}$]. C) [MLT$^{-2}$A$^{-2}$]. D) [ML$^{-1}$T$^{1}$A$^{-2}$]. Show Answer Correct Answer: C) [MLT$^{-2}$A$^{-2}$]. 60. Heliocentric theory proposed by Nicolas Copernicus was A) Replaced by elliptical orbits to fit the taste of new rulers of Italy. B) Replaced by elliptical orbits to fit the data better. C) Replaced by circular orbits to fit the data better. D) Replaced by parabolic orbits to fit the data better. Show Answer Correct Answer: B) Replaced by elliptical orbits to fit the data better. 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