Answer: The distance at which a star would have annual parallax of 1 second of arc. The number of hair on the head is clearly the ratio of the area of head to the cross-sectional area of a hair. : Length (m), Mass (kg), and time (S) Supplementary & Derived Units 14. (b) The surface area of a solid cylinder of radius 2.0 cm and height 10.0 cm is equal to ……..(mm)2. What is it called? Therefore, time needs more careful measurement. The common system of units which is used in mechanics are given below: 1. Answer: No, all physical quantities do not possess dimensions. Now, [V] = [LT–1], [A] = [LT–2] and [F] = [MLT–2] Q40. This led him to an interesting observation. Answer: Let the distance covered is S, Question 5. The diameter of the moon, D = θ x S How do we report our result for the density of the block? A SONAR (sound navigation and ranging) uses ultrasonic waves to detect and locate objects under water. 29. A small error in the measurement of the quantity having the highest power (in a given formula) will contribute maximum percentage error in the value of the physical quantity to whom it is related. How much will 5J measure in this new system? and average width of the image of hair as seen by microscope = 3.5 mm 33. If x = at2 + bt + c; where x is displacement as a function of time. (B) Hygrometer. 24. Answer: It is given that radius of sodium atom, R = 2.5 A = 2.5 x 10-10 m .•. Measure the length of this coil, mode by the thread, with a metre scale. Writing down the dimensions of both sides of equation (i), we get, Question 10. = 1920″ = 1920 x 4.85 x 10-6 rad [1″ = 4.85 x 10-6 rad] A calorie is a unit of heat or energy and it equals about 4.2 J where 1 J = 1 kgm2 s-2. Physics Past Exam Questions Measurement and Units 1. Answer: If so, why? Since, in this case significant figures in one quantity (3.00 x 108 ms–1) are 3 and the significant figures in the other quantity (3.154 x 107 s) are 4, therefore, the final result should have 3 significant figures. (b) Difference of mass = 2.17 – 2.15 = 0.02 g (A) Decibel (B) Coulomb (C) Hum (D) Cycles. .-. Do A and A.U. Write three physical quantities having dimensions \[[M{{L}^{-1}}{{T}^{-2}}]\]. Physics Important Questions Class 11 are given below. stand for same length? 3. The radius of a sphere is measured as (2.1 ± 0.5) cm calculate its surface area with error limits. Lightly sprinkle lycopodium powder on water surface. For a given base line, which will show a greater parallax - a distant star or a nearby star? Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning - Set 07. Accuracy of 1 part in 1011 to 1012. a=0,b=+(1/2) and c=+(1/2). =2000/3600 x π /180 rad Observation/question- what we see which leads us to the question we want to answer Hypothesis- A testable statement about the expected outcome. Can it be accurate without being precise? Write the dimensions and SI unit of linear momentum. (b) 7 ✕ 10 … Question 2. Convert this distance in A.U. Download MCQs for NEET Physics Units and Measurements, Get MCQs for Units and Measurements Physics for important topics for all chapters based on 2021 syllabus and pattern. Hence more reliable result can be obtained. Question 28. Example: 213 000 000 = 2.13 x 10^8 Order of magnitude: approximation of a number to the nearest power of ten. FPS System,4. r = 2.1 and Ar = ± 0.5 Why is parallax method not useful for measuring the distances of stars more than 100 light years away? | Physics Past Exam Questions Measurement and Units 1. However, this is only a theoretical idea.Practically speaking, increasing the number of ‘turns would create many difficulties. (c) Speed of vehicle = 18 km/h = 18 x 1000/3600 m/s Solving these equations, we get Question 7. Articles question_answer4) Do \[\overset{\text{o}}{\mathop{\text{A}}}\,\] and AU stand for the same unit of length? 100 Questions (and Answers) About Tests and Measurement asks (and answers) important questions about the world of social science measurement.It is ideal as an introduction to students new to the concepts, to advanced students and professionals looking to review ideas and procedures, as well as to those interested in knowing more about a test they have to take or how to … A wire has a mass 0.3 ± 0.003 g, radius 0.5 ± 0.005 mm and length 6 ± 0.06 cm. What are the units of A, B and C? Let us further assume that the thickness of a human air is 5 x 10-5m. Answer: As relative density is defined as the ratio of the density of given substance and the density of standard distance (water), it is a dimensionless quantity. Here 0.1% is the error in the measurement of length, and 0.5% is the error in the measurement of time. The number of hair on the human head is of the order of one million. Calculate the distance of Venus from the Earth at that time. If the value of P calculated using the above relation turns out to be 3.763, to what value should you round off the result? Question 2. Topics and Subtopics in NCERT Solutions for Class 11 Physics Chapter 2 Units and Measurements: NCERT Solutions Class 11 PhysicsPhysics Sample Papers, Question 2. 15. Can it be accurate without being precise? For example, mass, length, time, temperature, electric current, luminous intensity and amount of substance are seven fundamental physical quantities. The ratio is very large. It is on account of the fact that in solid phase atoms are tightly packed and so the atomic mass density is close to the mass density of solid. 21. A famous relation in physics relates ‘moving mass’ m to the ‘rest mass’ m0 of a particle in terms of its speed v and the speed of light c. (This relation first arose as a consequence of special relativity due to Albert Einstein). question_answer23) Can a quantity have different dimensions in different systems of units? Question 2. 14. 1. For sodium, A = 23 Amazing Facts Therefore, the final result should be rounded up to three significant figures. question_answer10) Why is parallax method not useful for measuring the distances of stars more than 100 light years away? State the number of significant figures in the following: 6. The value of l and h are 4.0 cm and 0.065 cm respectively where l is measured by a metre scale and h by the spherometer. Answer: Question 2. It t be the thickness of oleic acid film formed over water surface then the volume of oleic acid film = St Hence, answer is 10-6 Nuclear mass density = Mass of nucleus/Volume of nucleus (d) Equal volumes of two different substances have equal masses. Question 2. 2. Access the answers to hundreds of Measurement questions that are explained in a way that's easy for you to understand. It is the distance of an object that will show a parallax of 1″ (second) of arc from opposite ends of a baseline equal to the distance from the Earth to the Sun. Question 2. Unit and measurement. Define parsec. What is the total atomic volume in m3 of a mole of hydrogen atoms? Find the Young’s modulus of the material of the wire from this data. Question 24. | The mean value of the body; Mean absolute error; Percentage error; Answer: 1. (d) the number of strands of hair on your head d=vt/2 =1450 x 77.0/2 =55825 m=55.8 x 103 m or 55.8 km. We hope the NCERT Solutions for Class 11 Physics Chapter 2 Units and Measurements help you. | According to Avagadro’s hypothesis, one mole of hydrogen contains 6.023 x 1023 atoms. Calculate the pressure exerted over the area. [2010 OL] (i) Which of the following is the unit used to measure mass? The thickness of a hair can be measured by using a screw gauge. \[SI\] is a rational system of units while mks system is not so. 200 ml of a liquid. What is the percentage error in the quantity P? Each correct answer fetches 3 marks, while each incorrect answer has a penalty of 1 mark (-1 mark). Answer: Question 4. Explain this statement clearly: Substituting values of all known parameters we find that the value of x is nearly 15 billion years, which is approximately equal to the present estimate of the age of the universe. (e) We can determine the volume of the class-room by measuring its length, breadth and height. By practising these questions, students get thorough with the important topics of this chapter. Calculate the percentage error in the calculated value of density. Answer: (a) Total mass of the box = (2.3 + 0.0217 + 0.0215) kg = 2.3442 kg (cm)3 s-2 g-1. Does the magnitude of a physical quantity depend on the system of units chosen? | The first system, in which unit of power is 1 watt, is SI system in which M1 = 1 kg,L1 = 1 m and T1= ls in second system, M2 = 100 g, L2 = 20 cm and T2 = 1 min = 60 s. Question 24. 2. Can a physical quantity have dimensions but still have no units? J-kg. It is a well known fact that during a total solar eclipse the disk of the Moon almost completely covers the disk of the Sun. What is the necessity of selecting some units as fundamental units? Multiple Choice Questions (MCQ) for Units and Measurement - CBSE Class 11-science Physics on Topperlearning. Jobs Volume of one mole atom of sodium, V = NA .4/3 π R3 If the percentage errors in measurements of a, b and c are ± 1%, ±2% and ± 1.5% respectively, then calculate the maximum percentage error in value of x obtained. =11.3 x 103 kg m-4. [Energy] = [M L2 T-2], hence 1 joule = 1 kg x 1 m2 x 1 s-2 = 1 kg m2 s-2. NCERT Solutions Class 11 Business Studies, NCERT Solutions Class 11 Entrepreneurship, NCERT Solutions Class 11 Indian Economic Development, NCERT Solutions Class 11 Computer Science, Chapter 7 System of particles and Rotational Motion, Chapter 9 Mechanical Properties Of Solids, Chapter 10 Mechanical Properties Of Fluids, NCERT Solutions for Class 10 Science Chapter 1, NCERT Solutions for Class 10 Science Chapter 2, Periodic Classification of Elements Class 10, NCERT Solutions for Class 10 Science Chapter 7, NCERT Solutions for Class 10 Science Chapter 8, NCERT Solutions for Class 10 Science Chapter 9, NCERT Solutions for Class 10 Science Chapter 10, NCERT Solutions for Class 10 Science Chapter 11, NCERT Solutions for Class 10 Science Chapter 12, NCERT Solutions for Class 10 Science Chapter 13, NCERT Solutions for Class 10 Science Chapter 14, NCERT Solutions for Class 10 Science Chapter 15, NCERT Solutions for Class 10 Science Chapter 16, CBSE Previous Year Question Papers Class 12, CBSE Previous Year Question Papers Class 10, Accuracy, precision of instruments and errors in measurement, Dimensional formulae and dimensional equations, Dimensional analysis and its applications. Diameter of Jupiter D = θ x d = 1.73 x 10-4 x 824.7 x 109 m Choose your answers to the questions and click 'Next' to see the next set of questions. a. Question 21. = 2 x 22/7 x 2 x 10 (10 x 10 + 2 x 10) mm2 = 1.5 x 104 mm2 Hence, answer is 1.5 x 104. Area= l x b Which of the formulae for kinetic energy (K) given below can you rule out on the basis of dimensional arguments (m stands for the mass of the body) : (a) \[K={{m}^{2}}{{\upsilon }^{3}}\]       (b) \[K=\left( 1/2 \right)m{{\upsilon }^{2}}\] (c) \[~K=ma\]           (d) \[~K=\text{ }(\mathbf{3}\text{ }/16)m{{\upsilon }^{2}}\] (e) \[K=(\mathbf{1}/\text{ 2})m{{\upsilon }^{2}}+\text{ }ma\]. NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. Q36. Answer: Question 5. = 4/3 x 3.142 x (6.37 x 106)3m3 Short questions. 9. The distance D of sun from the earth is 1.496 × 10^11m . Answer:  —> Stress and Young’s modulus. True. Why Studyadda? question_answer19) Write three physical quantities having dimensions \[[M{{L}^{-1}}{{T}^{-2}}]\]. The S.I. Question 2. .•. question_answer12) Do all physical quantities have dimensions? (d) G = 6.67 x 10-11 N m2 (kg)-2 = …. Become a part of our community of millions and ask any question that you do not find in our Measurement Q&A library. Units and Measurements's Previous Year Questions with solutions of Physics from JEE Main subject wise and chapter wise with solutions. On this code-breaker worksheet, students need to convert the metric measurements into the units shown. Number of molecules of air in the class room .•. Question 22. V. Question On High Order Thinking Skills (HOTS) 2 years ago. .’. = 1.496 x 1011 m. Question 7. Estimate the average mass density of a sodium atom assuming its size to be about 2.5 A. Sol: For solving this problem, dimensions of physical quantity will remain same whatever be the system of units of its measurement. Cm2 is a Measurement of extremely Short distances sizes and other objects appear to run in specific... 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