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| Physics 11th Chapter 1 Measurements Questions Bank |
Physics 1st Year Chapter 1 Measurements Questions Bank
MCQs
Please select the right answer.
1. [M⁰L⁰T⁻¹] refers to quantity
2. 0.0023 can be expressed in scientific notation as:
3. 10²⁴ can be written in scientific notation as
4. 73.650 rounded off up to one decimal is
5. 75.560 is round off as:
6. A digit zero in a measurement?
7. A light year is a unit for
8. The correct answer regarding the rules of the addition of the significant figures will be
9. A wire when heated shows a 2% increase in length. The increase in the cross-section area would be?
10. Absolute uncertainties are added in following operations:
11. Absolute uncertainty in a measurement depends upon?
12. An accurate measurement is one which has less
13. An alternate unit to kgms⁻¹ is
14. An example of derived unit is
15. As Fd = 6πηrv, the dimension of coefficient of viscosity η is
16. Candela is the SI unit of
17. Dimensional analysis is helpful for?
18. Dimensions for acceleration due to gravity is
19. Error in measurement may occur due to
20. Error occurs due to negligence and inexperience of a person is:
21. For what physical quantity is the pascal a unit?
22. How many years in one second?
23. If the reading is taken with measuring scale whose minimum division is 1mm, then the correct reading is:
24. If x1= 10.5 ± 0.1 cm and x2= 26.8 ± 0.1 cm , then x = x2−x1 is given as:
25. In any measurement the significant figures are
26. In multiplication and division of measurement?
27. In scientific notation, numbers are expressed in?
28. ML⁻¹T⁻² is the dimension of?
29. Number of significant figures in 0.0173 are:
30. One femto stands for?
31. One light-year is equal to?
32. Percentage uncertainty in radius r is 2%. The percentage uncertainty in the volume of a sphere is?
33. Prefix deca represents?
34. Random error can be reduced by?
35. SI unit of coefficient of viscosity is?
36. SI unit of pressure is
37. Significant figures in 0.000846 are
38. Silicon is abundantly obtained from:
39. Smaller is the least count of the instrument, more is the measurement:
40. Steradian is the angel which lies in:
41. Steradian is the SI unit of?
42. The branch of physics which deals with atomic nuclei is called
43. The branch of physics which deals with the ultimate particles of which the matter is composed is:
44. The dimension of energy density is the same as that of?
45. The dimension of force is
46. The dimension of the following pair is not the same
47. The dimensional formula for the quantity light year is:
48. The dimensions of stain are
49. The dimensions of torque are:
50. The error in measurement may occur due to?
51. The number of base units are:
52. The number of significant figures in 0.0173 are?
53. The number of significant figures in 5.400 are?
54. The number of significant figures in the length of a bar 9800mm measured by meter rod is?
55. The prefix pico is equal to
56. The SI unit of intensity of light is:
57. The SI unit of plane angle is
58. The SI unit of the solid angle is
59. The SI units of pressure in terms of base units are
60. 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:
61. The sum of the three numbers, 2.7543, 4.10 and 1.273, up to correct decimal places is
62. The uncertainty in measurement may occur due to?
63. The unit of force is _______ and its symbol is ________ . Which is the correct pair?
64. 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?
65. To reduce the uncertainty in the timing experiment?
66. Total uncertainty, in the result obtained from the subtraction of two measurements, is equal to?
67. Unit of G is ?
68. What is the number of significant figures in the measurement recorded as 8.70 × 10 ?
69. Which equation is not dimensionally correct?
70. Which is a correct record for the diameter of wire when measured by a screw gauge of least count 0.001 cm:
71. Which is a derived unit:
72. Which is not a base unit in SI units?
73. Which of the following is a derived quantity:
74. Which of the following is least multiple:
75. Which of the following is not a correct representation method of prefixes?
76. Which of the following is SI base unit?
77. 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.
78. Which one is not a branch of physical sciences?
79. Which one is the correct representation of the unit of pressure?
80. Which one is the derived quantity in SI units?
81. Which one is the dimensionally correct equation?
82. Which one is the highest power multiple?
83. Which one is the highest power multiple?
84. Which one of the following is not a unit of length:
85. Which one of the following is not regarded as a fundamental quantity in Physics?
86. Which pair has the same dimension?
87. Which property of a solid object cannot be changed by the application of force?
88. Which system of the units is a coherent system of units in mechanics?
89. Zero error of the instrument is a type of?
90. Zero is not significant only if it
91. Zero to the right of non-zero digits are:
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 ?