1st Year Physics Chapter 1 Measurements Notes MCQs Bank

physics 11th notes Chapter 1

1. Which one of the following is not a unit of length:


2. Three students measured length of needle with meter rod and recorded as: (i) 0.2145m (ii) 0.21m (iii) 0.214m. Which one is a correct record?


3. Zero is not significant only if it


4. ML⁻¹T⁻² is the dimension of?


5. In multiplication and division of measurement?


6. The branch of physics which deals with atomic nuclei is called


7. Which of the following is a derived quantity:


8. Prefix deca represents?


9. 73.650 rounded off up to one decimal is


10. Which one is not a branch of physical sciences?


11. Which of the following is SI base unit?


12. The number of significant figures in 0.0173 are?


13. The dimensions of stain are


14. Significant figures in 0.000846 are


15. Which one of the following is not regarded as a fundamental quantity in Physics?


16. Which pair has the same dimension?


17. Smaller is the least count of the instrument, more is the measurement:


18. One light-year is equal to?


19. The number of significant figures in 5.400 are?


20. Unit of G is ?


21. Which one is the highest power multiple?


22. Which one is the dimensionally correct equation?


23. 0.0023 can be expressed in scientific notation as:


24. Which of the following length is more precise measured by the instrument having least count of 0.00001cm? (1) 5cm (2) 5.00cm (3) 5.000cm (4) 5.00000cm.


25. Which is not a base unit in SI units?


26. The unit of force is _______ and its symbol is ________ . Which is the correct pair?


27. An accurate measurement is one which has less


28. How many years in one second?


29. The branch of physics which deals with the ultimate particles of which the matter is composed is:


30. For what physical quantity is the pascal a unit?


31. Number of significant figures in 0.0173 are:


32. As Fd = 6πηrv, the dimension of coefficient of viscosity η is


33. 10²⁴ can be written in scientific notation as


34. [M⁰L⁰T⁻¹] refers to quantity


35. Which of the following is least multiple:


36. 75.560 is round off as:


37. Absolute uncertainty in a measurement depends upon?


38. Steradian is the angel which lies in:


39. SI unit of coefficient of viscosity is?


40. Error in measurement may occur due to


41. Which property of a solid object cannot be changed by the application of force?


42. The prefix pico is equal to


43. SI unit of pressure is


44. Percentage uncertainty in radius r is 2%. The percentage uncertainty in the volume of a sphere is?


45. Error occurs due to negligence and inexperience of a person is:


46. Which one is the highest power multiple?


47. Which equation is not dimensionally correct?


48. Silicon is abundantly obtained from:


49. Which is a derived unit:


50. The sum of the three numbers, 2.7543, 4.10 and 1.273, up to correct decimal places is


51. An alternate unit to kgms⁻¹ is


52. Total uncertainty, in the result obtained from the subtraction of two measurements, is equal to?


53. The number of base units are:


54. The uncertainty in measurement may occur due to?


55. Candela is the SI unit of


56. The error in measurement may occur due to?


57. Dimensions for acceleration due to gravity is


58. Absolute uncertainties are added in following operations:


59. The number of significant figures in the length of a bar 9800mm measured by meter rod is?


60. In scientific notation, numbers are expressed in?


61. The correct answer regarding the rules of the addition of the significant figures will be


62. What is the number of significant figures in the measurement recorded as 8.70 × 10 ?


63. Zero error of the instrument is a type of?


64. Steradian is the SI unit of?


65. The SI unit of intensity of light is:


66. The SI unit of the solid angle is


67. The dimensional formula for the quantity light year is:


68. Which one is the derived quantity in SI units?


69. The solid angle subtended at the center of sphere by an area of its surface equal to the square of radius of the sphere is called:


70. The SI units of pressure in terms of base units are


71. If the reading is taken with measuring scale whose minimum division is 1mm, then the correct reading is:


72. The dimension of energy density is the same as that of?


73. A light year is a unit for


74. A digit zero in a measurement?


75. Which system of the units is a coherent system of units in mechanics?


76. An example of derived unit is


77. The dimensions of torque are:


78. Which one is the correct representation of the unit of pressure?


79. The dimension of force is


80. Which is a correct record for the diameter of wire when measured by a screw gauge of least count 0.001 cm:


81. The dimension of the following pair is not the same


82. If x1= 10.5 ± 0.1 cm and x2= 26.8 ± 0.1 cm , then x = x2−x1 is given as:


83. Which of the following is not a correct representation method of prefixes?


84. One femto stands for?


85. Dimensional analysis is helpful for?


86. To reduce the uncertainty in the timing experiment?


87. A wire when heated shows a 2% increase in length. The increase in the cross-section area would be?


88. Zero to the right of non-zero digits are:


89. In any measurement the significant figures are


90. The SI unit of plane angle is


91. Random error can be reduced by?


Short Questions

1. Are radians and steradians the basic units of SI?
2. Define error. Also describe possible causes of error.
“3. Define following?
Base Units (ii) Derived Units (iii) Supplementary Units”
4. Define Physics? Describe its main areas of research.
5. Define random and systematic error?
6. Define significant figures?
“7. Define the following branches of modern physics
Nuclear Physics (ii) Particle Physics (iii) Relativistic Mechanics (iv) Solid State Physics “
8. Define the radians and steradian?
9. Differentiate among precision and accuracy.
10. Differentiate among the base and derived quantities.
11. Differentiate among the physical and biological sciences.
12. Differentiate among the random and systematic error.
13. Distinguish between base units and derived units?
14. Distinguish between Biological sciences and Physical sciences?
15. Does a dimensional analysis given any information on constant of proportionality that may appear in an algebraic expression?
16. Give the drawbacks to use the period of a pendulum as time standard?
17. How are random error and systematic error reduced?
18. How is degree of random error estimated?
19. How is the uncertainty in the time period of a vibrating body found?
20. How many significant figures are there in following measurements?
21. How the base quantities are measured?
22. How will you differentiate error from uncertainties?
23. Is it possible to have two quantities with the same dimensions but different found?Give for examples?
24. Name several repetitive phenomena occurring in nature which could serve as reasonable time standards?
25. Name the supplementary units?
26. State the principle of homogeneity of dimensions?
27. The period of simple pendulum is measured by a stop watch.What type of errors are possible in the time period?
28. Under what conditions zeros are not significant?
29. Under what conditions zeros are significant?
30. What are SI units of plane angle and solid angle?
31. What are significant figures?
32. What are the advantages of dimension analysis?
33. What are the characteristics of an ideal standard?
34. What are the significant figures? Describe their significance.
35. What are two types of errors?
36. What do you know about international system o
37. What do you know about physical quantities? Also describe their significance.
38. What do you know about the dimension analysis?
39. What do you know about the natural philosophy?
40. What do you mean by dimensions of physical quantity?
41. What do you mean by prefixes?
42. What do you mean by scientific notation? Describe the following numbers in scientific notation.
43. What do you mean by system international?When was it established?
44. What do you understand by a unit?
45. What does the word micro signify in the words micro wave oven?
46. What is homogeneity principle?
47. What is Rounding off data process?
48. What is scientific notation?
49. What is the importance of standard units in physical science?
50. What types of errors are possible in measuring the time period of pendulum by stop watch?
51. What types of natural phenomenon could serve as alternative time standards?
52. When is the equation said to be dimensionally correct?
53. Which areas in the study of Physics involve describe briefly?
“54. Which of the following measurement is more precise and which of them is mare accurate.
Length of object is recorded as 25.5 cm using meter rod.
The length of object is measured as 0.45cm using vernier calipers. “
55. Why do we find it useful to have two units for the amount of substance the kilogram and the mole?
56. Write down any two drawbacks of dimension analysis?
57. Write down the dimensions of velocity, acceleration and force?
58. Write down the significance of science and technology. Also describe the role of physics in the development of science and technology?
59. Write down the two points which should be kept in mind while using units?

Long Questions

1. Describe the principle of Homogeneity of Dimensional Analysis?
2. How will you assess the total uncertainty in the final result? Explain it fully in different cases.
3. Define and explain Random Error and Systematic Error in the measurement of a physical quantity.
4. Show that the expression vf = vi + at is dimensionally correct, where vi is the velocity at t=0 and vf is the velocity at time t.
5. Define meter and kilogram.
6. What is meant by scientific notation? Explain.
7. How do you access the total uncertainty in the final result for multiplication and division? Explain with example.
8. Write down uses of dimension analysis
9. A light year is the distance light travels in one year. How many metres are there in one light year: (speed of light = 3.0 x 10⁸ ms⁻¹). 
“10. a) How many seconds are there in 1 year?
b) How many nanoseconds in 1 year?
c) How many years in 1 second?”
11. The length and width of a rectangular plate are measured to be 15.3 cm and 12.80 cm, respectively. Find the area of the plate. 
12. Add the following masses given in kg upto appropriate precision. 2.189, 0.089, 11.8 and 5.32. 
13. Find the value of ‘g’ and its uncertainty using T = 2π √lglg from the following measurements made during an experiment. Length of simple pendulum l = 100 cm. Time for 20 vibrations = 40.2 s. Length was measured by a metre scale of accuracy upto 1 mm and time by stop watch of accuracy upto 0.1 s.
14. 1.6: What are the dimensions and units of gravitational constant G in the formula F=Gm₁m₂/r²
15. Show that the expression of vf =vi +at is dimensionally correct, where vi is the velocity at t =0 , a is acceleration and vf is the velocity at time t. 
16. The speed v of sound waves through a medium may be assumed to depend on (a) the density ρ of the medium and (b) its modulus of elasticity E which is the ratio of stress to strain. Deduce by the method of dimensions, the formula for the speed of sound. 
17. Show that the famous “Einstein equation” E = mc² is dimensionally consistent.
18. Suppose, we are told that the acceleration of a particle moving in a circle of radius r with uniform speed v is proportional to some power of r, say rⁿ, and some power of v, say vᵐ , determine the powers of r and v ? 

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