Also explore over 10 similar quizzes in this category. Here you can get Class 11 Important Questions Physics based on NCERT Text book for Class XI. For example, mass, length, time, temperature, electric current, luminous intensity and amount of substance are seven fundamental physical quantities. The velocity v of a particle depends on time t as: \[\upsilon =A{{t}^{2}}+Bt+C\] where \[\upsilon \] is in m/s and t in second. Question 2. The radius of curvature of a concave mirror, measured by a spherometer is given by R=l2/6h +h/2 The slide is projected on to a screen, and the area of the house on the screen is 1.55 m2. radius of sodium nucleus, Played 79 times. 2. Do all physical quantities have dimensions? E, m, 1 and G denote energy, mass, angular momentum and gravitational constant respectively.Determine the dimensions of El2/m5G2. The common system of units which is used in mechanics are given below: 1. = 9.7 x 10-3 rad d = 1.496 x 1011 m The orbital velocity v of a satellite may depend on its mass m, distance r from the centre of Earth and acceleration due to gravity g. Obtain an expression for orbital velocity. question_answer21) The velocity v of a particle depends on time t as: \[\upsilon =A{{t}^{2}}+Bt+C\] where \[\upsilon \] is in m/s and t in second. Answer: N m-1 s2 is nothing but SI unit of mass i.e., the kilogram. Obtain Dirac’s number, given that the desired number is proportional to mp-1 and me-2. Dimensions of L.H.S. However, the line of sight of distant and large size objects e.g., hill tops, the Moon, the stars etc., almost remains unchanged (or changes by an extremely small angle). Writing down the dimensions of both sides of equation (i), we get, Question 10. What is the significance of this number? This is 0.19 cm3 lower than the nominal measured value. | question_answer15) What is the basis of the principle of homogeneity of dimensions? Show that a calorie has a magnitude 4.2  α-1 β-2 γ2 in terms of the new units. Knowledge Test! Answer: Question 2. 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. Answer: Question 9. (a = maximum displacement of the particle, v = speed of the particle, T = time-period of motion)Rule out the wrong formulas on dimensional grounds. Answer:  As the Reynold’s number NR depends on density p, average speed v and coefficient of viscosity η, then let us say, Question 11. ft is required to find the volume of a rectangular Mock. ... (More than One Correct Answer) More. IV. However, this is only a theoretical idea.Practically speaking, increasing the number of ‘turns would create many difficulties. (d) The relative density of lead is 11.3. (b) a jet plane moves with great speed Question Answer . 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 … For sodium, A = 23 If its coincidence with the age of the universe were significant, what would this imply for the constancy of fundamental constants? NCERT Solutions; Board Paper Solutions; Ask & Answer; School Talk; Login; GET APP; Login Create Account. (c) CGS system. (In fact, since you are aware that you are moving, these distant objects seem to move with you). Answer:  Volume of one mole of ideal gas, Vg Suresh again got confused because he never used these units in India. Mass of rain-bearing clouds Calculate the distance of Venus from the Earth at that time. What do you understand by fundamental physical quantities? Which material is used in the liquid type of fuse? Notification question_answer43) Distinguish between accuracy and precision. 4.29 light years = 4.29 x 9.46 x 1015 = 4.058 x 1016 m Correct Answer. FAQ Solving these equations, we get Question 6. In the SI units, what makes the base units special? Answer: Radius of the Earth (R) = 6.37 x 106 m unit of time is ys. (a) kg m2 s-2 (b) kg-1 m3 s-2 (c) N kg2 m-2 (d) N kg2 m-2 = 3.09 x 1016 m = 3 x 1016 m. Question 2. θ=D/d In defining the standard of length, (the prototype metre), we have to specify the temperature at which the measurement should be made. To express these in terms of F, A and V, we must express, M, L and T in terms of these new ‘fundamental’ quantities. 0. | [2010 OL] (i) Which of the following is the unit used to measure mass? where r is the radius of the nucleus, A its mass number, and r0 is a constant equal to about,1.2 f. Show that the rule implies that nuclear mass density is nearly constant for different nuclei. kg m-3. Answer the following: Answer: Parsec is bigger unit than light year (1 parsec = 3.26 light year). (a) \[\mathbf{0}\mathbf{.0002 g}\] (b) \[\mathbf{20}\mathbf{.0 g}\]. Write three physical quantities having dimensions \[[M{{L}^{-1}}{{T}^{-2}}]\]. 1 A.U. (a) weber per metre2 (b) newton per coulomb per (metre per second) Note in Eqn. Which of the following measurements is more accurate and why? Obtain the dimensions of relative density. Hence the accuracy is increased. The speed of light in air is 3.00 x 108 ms 1. question_answer11) What is the difference between mN, Nm and nm? Question 2. (b) 1 m =………… ly (c) the wind speed during a storm Therefore, the final result should be rounded up to three significant figures. Study Guide Unit 1 Math, Measurement, and Scientific Practices 1. Answer:  —> Stress and Young’s modulus. Find the dimensions of \[K\]. Question 2. The ratio is very large. length (1) = 5.12 cm Converting metric and customary units to solve problems. Home GK Units Units & Measurements GK Questions and Answers - Set 01 Units & Measurements GK Questions and Answers - Set 01 GK Units Edit G.K. 6 .—(b) 7 .—(a) 8 .—(d) 9.—(b) 10.—(d). Example: 213 000 000 = 2.13 x 10^8 Order of magnitude: approximation of a number to the nearest power of ten. (c) Least count of optical instrument = 6000 A (average wavelength of visible light as 6000 A) = 6 x 10-7m As the least count of optical instrument is least, it is the most precise device out of three instruments given to us. Further, it was a very large number, its magnitude being close to the present estimate on the age of the universe (-15 billion years). ‘The length, breadth and thickness of a rectangular sheet of metal are 4.234 m, 1.005 m and 2.01 cm respectively. (A) Speed of aeroplanes. Chapter – 1. Since the least number of decimal places is 1, therefore, the total mass of the box = 2.3 kg. Answer: 16. (Use the known values of Avogadro’s number and the atomic mass of sodium). | False. Multiple Choice Questions (MCQ) for Units and Measurement - CBSE Class 11-science Physics on Topperlearning. Question 2. (c) modulus of elasticity (d) all the above Fill in the blanks by suitable conversion of units We can estimate the area of the head. .•. Answer: The line joining a given object to our eye is known as the line of sight. What are the units of A, B and C? Express a joule in terms of fundamental units. Find the value of the gas constant R. Answer: MORE QUESTIONS SOLVED. Answer: Question 22. It t be the thickness of oleic acid film formed over water surface then the volume of oleic acid film = St NCERT Solutions for Class 11 Physics Chapter 2 Units and Measurements are part of Class 11 Physics NCERT Solutions. A new unit of length is chosen such that the speed of light in vacuum is unity. [2007 OL] The arithmatic mean of all the absolute errors is\[\mathbf{0}.\mathbf{11}\text{ }\mathbf{s}\]. II. What is it called? 2. Hence, we shall express the value of P after rounding it off as P = 3.8. unknowns. There are several systems of units with different conventions to express these units. Question 2. The Sun is a hot plasma (ionized matter) with its inner core at a temperature exceeding 107 K, and its outer surface at a temperature of about 6000 K. At these high temperatures, no substance remains in a solid or liquid phase. Show that The SI units of the universal gravitational constant G are 3. = 4/3 πr3 = 4/3 π [r0 A1/3]3 = 4/3 πr03A A book with many printing errors contains four different formulas for the displacement y of a particle undergoing a certain periodic motion: He asked there an Englishman how far is Central London from here.He replied that it is 16 miles. Deduce the dimensional formula for D. V ) = (1.37 – 0.01) x (4.11 – 0.01) x (2.56 – 0.01) cm3 = (1.36 x 4.10 x 2.55) cm3 = 14.22 cm3 Answer: Question 5. Answer: Question 10. .-. v/u= tan θ, where u is velocity of rain. The parallactic angle subtended by a distant star is 0.76 on the earth’s orbital diameter (1.5 x 1011 m). Atomic volume of 1 mole of hydrogen atoms Questions Bank 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) \[K=(\mathbf{1}/\text{ 2})m{{\upsilon }^{2}}+\text{ }ma\]. = Speed of light in vacuum x time taken by light to travel from Sim to Earth = 3 x 108  m/ s x 8 min 20 s = 3 x 108 m/s x 500 s = 500 x 3 x 108 m. Value-Based Questions (A) Decibel (B) Coulomb (C) Hum (D) Cycles. Again working with lasers we require length measurements to an angstrom unit (1 A° = 10-10m) or even a fraction of it. Question 1. The nearest divisions would not clearly be distinguished as separate. What is the difference between mN, Nm and nm? What is the basic principle of alpha particle scattering method for estimating the size of the nucleus? Now Vg/VH=22.4 x 10-3/3.1548 x 10-7 =7.1 x 104 Register online for Physics tuition on Vedantu.com to … – 2c = – 1 …(Hi) Volume of Sun = 4/3πr3 x 3.14 x (7 x 108)3  = 1.437 x 1027 m3 Which of the following readings is the most accurate : (i) \[\mathbf{~5000 m}\] (ii) \[\mathbf{5\times 1}{{\mathbf{0}}^{\mathbf{2}}}\mathbf{m}\] (iii) \[\mathbf{5\times 1}{{\mathbf{0}}^{\mathbf{3}}}\mathbf{m}\]? What are the derived units? (b) We know that least count = Pitch/number of divisions on circular scale When number of divisions on circular scale is increased, least count is decreased. The parallax of a heavenly body measured from two points diametrically opposite on earth’s equator is 60 second. (a) atoms are very small objects 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) \[K=(\mathbf{1}/\text{ 2})m{{\upsilon }^{2}}+\text{ }ma\]. Precise measurements of physical quantities are a need of science. neet solved physics mcq, Units, dimension and measurement ,solved 275 mcq for IIT, AIIMS, NEET, MCAT and State board CET examinations gneet TOPIC : Units, dimension and measurement Number of questions are 276 | Units of Electrical Measurements Quiz (25 Questions With Fully Answers). He explained his brother that here F.P.S. Find the value of 60 W on a system having 100 g, 20 cm and 1 minute as the fundamental units. | Please answer this question urgently..... Share with your friends. As p = M/V,                .’. V = l x w x h Answer: (a) The average rainfall of nearly 100 cm or 1 m is recorded by meteorologists, during Monsoon, in India. Convert the following measurements into mL. Topics and Subtopics in NCERT Solutions for Class 11 Physics Chapter 2 Units and Measurements: NCERT Solutions Class 11 PhysicsPhysics Sample Papers, Question 2. Compute the error in measurement of radius of curvature. A physical quantity is represented by X = MaLb TA If percentage error in the measurement of M, L and T are a%, (3% and y% respectively, then total percentage error is question_answer28) Can an instrument be called precise with-out being accurate? 13. Multiple Choice Questions thus obtained and why? (b) the mass of an elephant Estimate the average mass density of a sodium atom assuming its size to be about 2.5 A. (a) Time (b) Distance (c) Frequency (d) Angular acceleration 0.75 liters. For example, to ascertain the speed of an aircraft, one must have an accurate method to find its positions at closely separated instants of time. 25. Check by the method of dimensional analysis whether the following relations are correct. = 7.4 x 1010 m. Question 4. ... 30 seconds . Radius of hydrogen molecule = 1A/2 A student measures the thickness of a human hair by looking at it through a microscope of magnification 100. In the new system, the speed of light in vacuum is unity. Assuming that T = k Pa db Ec and substituting dimensions of all the quantities involved, we have What is done to minimize this error? Fill in the blanks Trivia Quiz quiz which has been attempted 4465 times by avid quiz takers. (b) A Jet plane moves with a speed greater than that of a super fast train. Thus, nuclear mass density is constant for different nuclei. How will you estimate the diameter of the thread? Answer:  Given that l = 4 cm and Al = 0.1 cm (least count of the metre scale) here l is the distance between the legs of the spherometer. Answer. 2 years ago. Free Question Bank for 11th Class Physics Physical World Units and Measurements Conceptual Problems Explain this statement clearly: The unit of length convenient on the nuclear scale is afermi: I f=10-15 m. Nuclear sizes obey roughly the following empirical relation: 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? 2. The number of hair on the human head is of the order of one million. Jobs How much will 5J measure in this new system? = 173.242 x 10-6 = 1.73 x 10-4 rad 55.8 km to revise complete Syllabus and … long answer Type Questions Question 1 s average is... First note that the thickness of a sound amount of physical property a. A rational system of units with different conventions to express the distances of stars in terms of light is! 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