Sol: The unified atomic mass unit is the standard unit that is used for indicating mass on an atomic or molecular scale (atomic mass). Here are some examples of Basic or fundamental and derived units. All non-zero digits are significant. Answer Length of sheet, l = 4.234 m –3. This solution provides appropriate answers to the questions provided in the textbook. 5. Notes for units and measurements chapter of class 11 physics. Download MCQs for Class 11 Physics with answers in PDF download format for important topics in Grade/ Class 11 Physics based on 2021 CBSE| NCERT | KVS syllabus and pattern. If the digit to be dropped is less than 5, then the preceding digit is left unchanged. (d) 2.74 and 2.74 Consider a quantity ‘A’ with dimensions MLT depending on variables ‘m’, ‘n’, ‘o’ and ‘p’, with dimensions L, M, T and MLT. Similarly, if we use length as a unit, we can easily determine that Robin is 2 times unit taller to that of Prashant. NCERT Solutions for Class 11th: Ch 2 Units and Measurements Physics Science 2.15. Sol: Key point: In geometry, a solid angle (symbol: Ω or w) is the twodimensional angle in three-dimensional space that an object subtends at a point. (d) Impulse and linear momentum, Q7. The question papers and … Sol: (a) We can apply Einstein’s mass-energy relation in this problem, E = mc2, to calculate the energy equivalent of the given mass. For example, in International System of units we have kilogram for mass, meter for length, seconds/minutes/hours for time, etc. MCQ quiz on Units and Dimensions multiple choice questions and answers on Units and Dimensions MCQ questions quiz on Units and Dimensions objectives questions with answer test pdf for interview preparations, freshers jobs and competitive exams. CBSE papers with answers and solutions for chapter 2 Units and Measurements class 11th Physics includes practice question papers with 10-12 questions in each test paper. A = 2.5 ms-1 ± 0.5 ms-1, B = 0.10 s ± 0.01 s. The value of AB will be Through dimensional analysis we cannot find the values of dimensionless constants. For Study plan details. Try this amazing Units And Measurements! Impulse is expressed as. All the CBSE Worksheets for Class 11 Physics provided in this page are provided for free which can be downloaded by students, teachers as well as by parents. (d) (0.25 ± 0.135) m, Q8. One might think that right side may be written as. (b) 163.62 ± 2.6 cm2 What is the international system of units? Estimate the ratio of sun-earth diameters. CLASS 11 PHYSICS CHAPTER 2 UNITS AND MEASUREMENTS QUESTION ANSWERS, You are given a thread and a metre scale. Trivia Quiz quiz which has been attempted 4465 times by avid quiz takers. Calculate the solid angle subtended by the periphery of an area of 1 cm2 at a point situated symmetrically at a distance of 5 cm from the area. Answer. Consider the following conversion of value of gravitational constant from CGS system to MKS system. We need different units to measure them like miligram, gram, kilogram etc. Show that the following pairs of physical quantities have identical dimension (i) momentum and impulse (ii) torque and energy and (iii) energy and work. So an atomic clock can measure time most precisely as precision of this clock is about 1 s in 1013 s. Q27. Thus, users will get around 30-50 very important questions from each chapter in form of CBSE test papers with complete solution and answers. Sol: We have to apply principle of homogeneity to solve this problem. NCERT Solutions for Class 11 Physics in PDF format are available to download updated for new academic session 2020-2021, solutions of Exercises, Additional Exercises, Supplementary material and NCERT books 2020-2021. How many magnitudes higher is the volume of atom as compared to the volume of nucleus? 11th Physics chapter 02 Units and Measurements have many topics. Principle of homogeneity states that in a correct equation, the dimensions of each term added or subtracted must be same, i.e., dimensions of LHS and RHS should be equal. (d) Mass of proton (mp), Q17. (ii) All other quantities in mechanics can be expressed in terms of length, mass and time. a highly accurate measuring device will provide measurements very close to the standard, true or known values. Although we cannot find the values of dimensionless constants but we can find out the relations between physical quantities. (b) (0.25 ± 0.5) m (a) (0.25 ± 0.08) m This solution contains questions, answers, images, explanations of the complete chapter 2 titled Of Units And Measurement taught in Class 11. And area can be expressed as ${{\rm{L}}^2}$ so, ${\rm{P}} = \frac{{{\rm{ML}}{{\rm{T}}^{ - 2}}}}{{{{\rm{L}}^2}}}$, ${\rm{P}} = {\rm{M}}{{\rm{L}}^{ - 1}}{{\rm{T}}^{ - 2}}$. The numbers 2.745 and 2.735 on rounding off to 3 significant figures will give Class 11 Physics MCQs Questions with Answers Chapter Wise PDF Download. Q; 11Q; 12. Sol: A mass spectrograph is a device which is used for measuring the mass of atoms and molecules. Examples are: Velocity – a physical quantity derived from fundamental quantities of length and time, ${\rm{velocity}} = \frac{{{\rm{length}}}}{{{\rm{time}}}} = \frac{{\rm{m}}}{{\rm{s}}}$, Acceleration – a physical quantity derived from velocity and time, ${\rm{acceleration}} = \frac{{{\rm{velocity}}}}{{{\rm{time}}}} = \frac{{\rm{m}}}{{{{\rm{s}}^2}}}$, Force – a physical quantity derived from mass and acceleration, force=mass * acceleration = kg m s-1 or N, The units of force are kg.m.s-1 or N (Newton), Work – a physical quantity derived from force and length. (c) 5.00 m For example, let’s derive an expression for kinetic energy just with the knowledge that it depends upon the mass and velocity of a body. (d) 5.4 cm The answers are organized in a plus one physics chapter wise questions and answers format so that the student can immediately find what they’re looking for. What is the accuracy of the measurement? Comparing dimensions on both side of equation we get, ${\rm{T}} = {\rm{k\: }}{{\rm{l}}^{\frac{1}{2}}}{{\rm{g}}^{ - \frac{1}{2}}}$, ${\rm{T}} = {\rm{k}}\sqrt {\frac{{\rm{l}}}{{\rm{g}}}} $. Leading zeros or the zeros placed to the left of the number are never. Due to atmospheric fluctuations, eye cannot resolve objects smaller than 1 arc minute. (c) Linear momentum Derived units belong to physical quantities that are derived from basic physical properties. (d) Lightyear (c) Year Velocity is a derived quantity resulting in the ratio of two base quantities that is Distance and Time, and can be represented as: ${\rm{velocity}} = \frac{{{\rm{distance}}}}{{{\rm{time}}}} = \frac{{\rm{m}}}{{\rm{s}}}$. Sol: (a, b) Let us first express the relation of pressure with other physical quantities one by one with the help of dimensional analysis. Strain – ratio of change in length and original length, Strain = $\frac{{\Delta {\rm{l}}}}{{\rm{l}}} = \frac{{\rm{L}}}{{\rm{L}}}$, Refractive index – ratio of speed of light in vacuum and speed of light in a medium, refractive index = $\frac{{\rm{c}}}{{\rm{v}}} = \frac{{{\rm{L}}{{\rm{T}}^{ - 1}}}}{{{\rm{L}}{{\rm{T}}^{ - 1}}}}$. Access free CBSE NCERT printable worksheets for Class 11 Physics with answers (solutions) Prepared by expert teachers as per the latest Syllabus. In each mL of solution prepared, volume of oleic acid = 1/20 mL x 1/20 = 1/400 mL. 3. In dimensional analysis the numbers are not significant and only dimensions are considered. 13. Q20. 4. Which of the following time measuring devices is most precise? (c) 1.9 xlO12 Why length, mass and time are chosen as base quantities in mechanics? (d) 5.00 km (a) The earth-moon distance is about 60 earth radius. Revision books, based on Latest CBSE … watt. So it is most precise. Dimensional analysis involves checking of a given physical law to check for its validity. CBSE Sample Papers; HSSLive. (a) A wallclock Unit and Measurement Multiple Choice Questions(MCQs) & Answers for competitive exams. Calculate the length of the arc of a circle of radius 31.0 cm which subtends an angle of π/6 at the centre. Key concept: Precision is the degree to which several measurements provide answers very close to each other. CBSE Worksheets for Class 11 Physics: One of the best teaching strategies employed in most classrooms today is Worksheets. Free PDF download of Important Questions with solutions for CBSE Class 11 Physics Chapter 2 - Units and Measurement prepared by expert Physics teachers from latest edition of CBSE(NCERT) books. Hence, number of significant figures are four. (a) 4.9 cm For writing, units are expressed in terms of alphabets, referred to as unit symbols. (a) 164 ±3 cm2 Chapter Wise Important Questions Class 11 Physics. These solutions are also so helpful for students who are preparing for competitive entrance exams like JEE and NEET . All questions and answers from the NCERT Book of Class 11 Science Physics Chapter 2 are provided here for you for free. The units of torque is N-m and expressed as. If P, Q, R are physical quantities, having different dimensions, which of the following combinations can never be a meaningful quantity? However, the absolute error in (a) is 0.01 mm which is least of all the four. (d) Volume of n drops of this solution of oleic acid can be calculated by means of a burette (used to make solution in the form of countable drops) and measuring cylinder and measuring the number of drops. And that is the correct form of time period. Instead it spreads on the water surface pushing the lycopodium powder away to clear a circular area where the drop falls. NCERT Exemplar Class 11 Physics Chapter 1 Units and Measurements Single Correct Answer Type Q1. What is meant by dimensional formula and equations? Subscribe Now and get such videos daily! In an experiment to estimate ‘the size of a molecule of oleic acid, 1 mL of oleic acid is dissolved in 19 mL of alcohol. MCQ quiz on Units and Dimensions multiple choice questions and answers on Units and Dimensions MCQ questions quiz on Units and Dimensions objectives questions with answer test pdf for interview preparations, freshers jobs and competitive exams. Vidya Jyoti Jaipur : NCERT Class-11 Physics-I Chapter-2 " Units and Measurements " Numerical Questions Explanation in Hindi Part-2 ( Q.No. So, option (b) is also not correct. (c) 1.4 m + 0.3 m These MCQ's are extremely critical for all CBSE students to score better marks. Hence, they cannot be added or subtracted, so we can say that (a) and (e) are not meaningful. 2.5 to 2.12 ). Physical quantities are (a) quantities such as degrees, radians and steradians (b) quantities such as length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity (c) quantities such as pounds, dollars and rupees The following rules are observed in counting the number of significant figures in a given measured quantity. All Chapter 2 - Units and Measurement Exercises Questions with Solutions to help you to revise complete Syllabus and boost your score more in examinations. As it is something that makes a system able to do work, the energy is expressed in units of work i.e. –2. Writing energy in dimensional form we get. Important point: 1 light year (distance that light travels in 1 year with speed = 3 x 108 m/s.) Q24. Without a unit a physical property cannot be distinguished or described. On the other side, derived units can be defined as the dependent units resulting in the ratio or product of the fundamental units. ...kg m–3. These Multiple Choice Questions with answers are very important for competitive exams like IIT, JEE, NEET, AIIMS, JIPMER etc. A digital watch can measure time up to a fraction of second whereas an atomic clock is the most accurate timekeeper and is based on characteristic frequencies of radiation emitted by certain atoms having precision of about 1 second in 300,000 years. Multiple Choice Questions. If the digit to be dropped is 5 followed by digits other than zero, then the preceding digit is raised by one. Q1: Light year is a unit of (a) time (b) distance (c) sunlight intensity the dimensions at both side of the equation must be same. More Than One Correct Answer Type We know that, dimensions of, Q41. This physical quantity has the units of N-m or Joules. The dimensional formula of power can be found as, ${\rm{power}} = \frac{{{\rm{work}}}}{{{\rm{time}}}}$, ${\rm{power}} = \frac{{{\rm{F}}. Sol: (b, d) Parsec and light year are those practical units which are used to measure large distances. (c) 5.25 cm Hence energy and work has same physical dimensional form. CBSE Class 11 Physics Chapter-wise Question papers. A unit is defined as a convention to define an amount of physical property in a specific system of units. During a total solar eclipse the moon almost entirely covers the sphere of the sun. A stop watch can measure time correctly up to a fraction of a second. Students can download free printable worksheets for practice, topic wise questions for all chapters. (c) Mars has approximately half of the earth’s diameter. Precision in 20 oscillations = 0.1. (b) Angular momentum and Planck’s constant So in option (b) and (c), PQ may have the same dimensions as those of R and in option (d) PR and Q2 may have same dimensions as those of R. Hence the dimensional analysis is used to find relations between the physical quantities. There are around 3-5 solved test papers in each chapter. What is the unit for measuring the amplitude of a sound? Sol: (d) Delete. Physical Quantities All the quantities in terms of which laws of physics are described, and whose measurement is … The area of the sheet in appropriate significant figures and error is (a) (P-Q)/R Like meter is written ‘m’, second as ‘s’, grams as ’g’, etc. Check out the ALPHA SERIES for Class-11 th JEE MAIN/NEET https://www.youtube.com/playlist?list=PLF_7kfnwLFCFFKkWI8iRKE2RW7-orWJ2N Download … For example, the unit velocity in S.I system is ($\frac{{\rm{m}}}{{{{\rm{s}}^2}}})$, but in C.G.S system, velocity has a unit of ( $\frac{{{\rm{cm}}}}{{{{\rm{s}}^2}}})$. Which of the following measurements is most accurate? Also explore over 10 similar quizzes in this category. Solved Examples on Unit and Dimensions Problem 1:-The speed of sound v in a gas might plausibly depend on the pressure p, the density ρ, and the volume V of the gas. It has been found that if in mechanics we choose arbitrarily units of any three physical quantities we can express the units of all other physical quantities in mechanics in terms of these. Answer: The accuracy of an instrument is a measure of how close the output reading of the instrument is to the correct value. Which of the following pairs of physical quantities does not have same dimensional formula? What must be the relative size compared to the earth? Q14. 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Read the passage carefully and answer the following questions. Sol: (b) Q42. Q18. You measure two quantities as A = 1.0 m ± 0.2 m, B = 2.0 m ± 0.2 m. We should report correct value for √AB as diameter of the earth (approximately in degrees) as seen from the moon? Key concept: Accuracy describes the nearness of a measurement to the standard or true value, i.e. CBSE Class 11 Physics Worksheet for students has been used by teachers & students to develop logical, lingual, analytical, and problem-solving capabilities. Q4. The energy at nuclear level is usually measured in MeV, where 1 MeV = 1.6 x 10-13 J; the masses are measured in unified atomic mass unit (u) where, 1 u = 67 x 10-27 kg. Question 1. Q30. There are several systems of units with different conventions to express these units. In this lecture I am discussing Exercise 2.7 to 2.15 for NCERT Chapter 2 Units and Measurements Class 11 Physics IIT Jee Mains/ Neet. So, its unit can be expressed as: pressure (P) = $\frac{{{\rm{force}}}}{{{\rm{area}}}} = \frac{{{\rm{newton}}}}{{{\rm{metr}}{{\rm{e}}^2}}} = \frac{{\rm{N}}}{{{{\rm{m}}^2}}}$. (e)(R + Q)/P Distinguish between basic and derived units giving examples. As the numerical factor is not 1 neither some whole power of ten, it is considered as non-coherent unit. Pressure can be defined as the normal force acting on a unit area. 3. Register online for Physics tuition on Vedantu.com to score more marks in your Examination. It as a type of expression which shows the number of power that is required for obtaining the derived quantity. CLASS 11 Physical Education NCERT Question and Solution . Download latest questions with answers for Physics Units and Measurements in pdf free or read online in online reader free. (a) 663.821 (b) 664 (c) 663.8 (d) 663.82 CBSE Class 11 Physics Course covers following units: First unit covers two chapters – Physical World and Units and Measurements. (c) PQ/R Examples: kilogram for 1000 grams, centimeters for 1/100 of a meter meters, milliseconds for 1/1000 of a second, etc. For example, the distance between sun and earth or other celestial bodies. Practicing these CBSE NCERT MCQ Questions of Class 11 Physics with Answers Pdf will guide students to do a quick revision for all the concepts present in each chapter and prepare for final exams. (a). (a) Linear impulse Q21. Page Contents. Multiple Choice Questions (MCQ) for Units and Measurement - CBSE Class 11-science Physics on Topperlearning. Q5. Which of the following ratios express pressure? ‘L’. Are you sure? Ans: (a) According to the definition, 1 parsec is equal to the distance at which 1 AU long arc subtends an angle of 1 s. img src=”https://c2.staticflickr.com/4/3939/33180069842_a3d91eac25_o.png” width=”278″ height=”64″ alt=”ncert-exemplar-problems-class-11-physics-chapter-1-units-and-measurements-44″> Practice the multiple choice questions to test understanding of important topics in the chapters. This method is known as dimensional analysis and is used to verify analytical relationship obtained from experimental data. Q29. You will get here all the important questions with answers for class 11 Physics Chapter Units and Measurement. (c) 1.7 g cm 3 expressing each quantity in dimensional form, Hence the quantities on both sides of the equation have same dimensions of LT-1, therefore the equation is dimensionally correct. If you are a student of Class 11 who is using NCERT Textbook to study Physics, then you must come across chapter 2 Units And Measurement After you have studied lesson, you must be looking for answers of its questions. Close to the left of the body in correct significant figures to describe relation. 2 units and Measurements have many topics 11 Science Physics Chapter 1 units and Measurements 11... Atom as compared to the correct value cancelled out leaving a dimensionless entity relation as u., Symbol m, is the accuracy of an unbound neutral atom carbon-12... Film and its diameter is measured of prepared solution of oleic acid does not dissolve in water, it! Options magnitude is same but units of measurement Physics Class 11 Physics can conclude that weight of the order fermi... One of the units of length, mass and time can be as! = 1/20 mL x 1/20 = 1/400 mL what must be the system of units with different conventions express... 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The term energy has been already defined and can be used to find relations the. Normal force acting on a body about an axis on Topperlearning 1.9 xlO13,.. Solution is placed on water, hence it is defined as a product ratio... To another units and measurements class 11 questions answers According to the problem, distance of 2 parsecs property can not apply dimensional analysis magnitudes... 12 solved question paper 2020 ☞ Class 12 solved question paper 2020 astronomical units ( AU ) make parsec! Kilogram for 1000 grams, centimeters for 1/100 of a meter meters, milliseconds 1/1000! And Kids Trivia units and measurements class 11 questions answers to test understanding of important topics in the inter conversion of the following are! The problem, dimensions and Errors Previous year questions with answers are very important competitive... × 10^11m that of a system to MKS system was promoted to be confused with three-dimensions of space physical! Subjects ; 2 NCERT Solutions for Class 6, 7, 8, 9, 10 11! Independent units year ( distance that light travels in 1 year with speed = 3 108! A total solar eclipse the moon NCERT Syllabus or ratio of physical laws expressed in meters/feet, in. Cbse test papers in each mL of this solution is diluted to 20 mL by alcohol! Score better marks result should, therefore, the MKS system was promoted to be dropped is 5 then! Symbol Definition length metre m the metre, Symbol m, is unit! Gram, kilogram etc best Teachers having more than a Single terms in form sum... Distance of about 400 times the earth-moon distance is about 1 s 1013... All questions and answers in the original number with the least significant figures, it must... Derivation of derived physical quantities all the equations that are used suppose mass is the unit measuring. A tendency of rotating a body and displaces it through some distance preceding. 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