Answer: Question 14. Fill in the blanks NCERT Solutions for Class 7 Science in PDF file format free to download. If so, why? Guess where to put the missing c. So, the nuclear mass density is nearly 50 million times more than the atomic mass density for a sodium atom. NCERT Book Solutions for Class 11 for the Humanities subjects are also available here. A student measures the thickness of a human hair by looking at it through a microscope of magnification 100. distance between Sun and Earth = 500 new units. Hence, answer is 10-6 He explained his brother that here F.P.S. Answer:  Let orbital velocity of satellite be given by the relation (c) Speed of vehicle = 18 km/h = 18 x 1000/3600 m/s ‘Parsec’ is the unit of: l = (1.37 ± 0.01) cm w = (4.11 ± 0.01) cm h = (2.56 ± 0.01) cm Lower limit of the volume of the block is, And, in terms of the new unit of time, Ask your doubts related to NIOS or CBSE Board or any other educational fact through Discussion Forum and reply to the other users. (d) the air inside this room contains a large number of molecules NCERT solutions for Class 11 Physics Chapter 2 Units and measurement is the best study resource you can get to understand the topics and to score good grades in your class 11 final examination. The two specific heat capacities of a gas are measured as Cp = (12.28 ± 0.2) units and Cv = (3.97 ± 0.3) units. Check by the method of dimensional analysis whether the following relations are correct. 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). (a) You are given a thread and a metre scale. 23. Answer:According to dimensional analysis an equation must be dimensionally homogeneous. To get the latest copy of NCERT Solutions for Class 11 Physics Chapter 3 visit Vedantu.com 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 (b) A Jet plane moves with a speed greater than that of a super fast train. (a) The size of an atom is much smaller than even the sharp tip of a pin. 3. = Dimensions of R.H.S. It is known that the period T of a magnet of magnetic moment M vibrating in a uniform magnetic field of intensity B depends upon M, B and I where I is the moment of inertia of the magnet about its axis of oscillations. Answer: It is given that radius of sodium atom, R = 2.5 A = 2.5 x 10-10 m = A/(4/3πr03A) = 3/4πr03 (b) A screw gauge has a pitch of 1.0 mm and 200 divisions on the circular scale. Here we have given NCERT Solutions for Class 11 Physics Chapter 2 … Accuracy of 1 part in 1011 to 1012. 16. If volume of each drop of solution be V, then volume of n drops = n V Briefly explain how you will estimate the molecular diameter of oleic acid. For estimating nuclear sizes we require a precision of 10-15 m. To measure atomic masses using mass spectrograph we require a precision of 10-30kg and so on. Now Vg/VH=22.4 x 10-3/3.1548 x 10-7 =7.1 x 104 (d) The air inside this room contains more number of molecules than in one mole of air. Given 1 A.U. Here you can get complete NCERT Solutions for Class 11 Physics Chapter 2 Units And Measurement in one place. Answer: Question 2. So, the nuclear mass density is independent of mass number. Question 21. =>t=nV/400S 6. Question 2. Question 2. [T] = [M L-1 T-2]a [M L-3]b [M L2 T-2]c  Equating powers of M, L and T on both sides, Using a dropper of fine bore gently put few drops (say n) of the solution prepared on to water. Find the dimensions of the following quantities Question 24. 4.29 light years =4.508 x 1016/3.80 x 1016 = 1.318 parsec = 1.32 parsec. In the evening Suresh inquired all about it. A new unit of length is chosen such that the speed of light in vacuum is unity. }}\end{array}\) b = (16.8 ±0.1) cm = 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. Since, θ=1″ (s) and b=3 x 1011 m = area x height x density = 3.3 x 1012 x 1 x 1000 kg = 3.3 x 1015 kg. Are the two densities of the same order of magnitude? (a) 9% (b) 7% (c) 5% (d) 1% $$1 \mathrm{g}=\frac{1}{1000} \mathrm{kg}$$ get v = kma rb gc where k is a dimensionless constant and a, b and c are the unknown powers. Question 1. For example, the distance between two cities on earth is measured in kilometres but the distance between stars or inter —galactic distances are measured in parsec. (e) We can determine the volume of the class-room by measuring its length, breadth and height. This led him to an interesting observation. Hence, mass of the earth = 5.97 x 1024  kg. Answer: SONAR stands for ‘sound navigation and ranging’. Question 2. (b) Surface area = 2πrh + 2πr2 = 2πr (h + r) Question 16. V = l x w x h Hence the accuracy is increased. Some suggestions for studying NCERT Solutions for Class 11 Physics. a = -5/6 b = 1/2 c = 1/3. Volume of earth = 4/3π 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. (Speed of sound in water = 1450 m s-1). Answer: Question 2. Study every day: A student should study NCERT text book one hour per day for seven days. Think of ways by which you can estimate the following (where an estimate is difficult to obtain, try to get an upper bound on the quantity): The ratio is very large. Answer: Question 5. 25. Did you find NCERT Solutions Class 11 Physics chapter 2 Units And Measurement helpful? NCERT Solutions for Class 12 Physics Chapter 2 Electrostatic Potential and Capacitance exercises are given below to use it online or download in PDF form for offline. Answer: N m-1 s2 is nothing but SI unit of mass i.e., the kilogram. (ii) Unit system are : Question 19. (c) Due to random errors, a large number of observation will give a more reliable result than smaller number of observations. radius of sodium nucleus, Home; ... CBSE Rankers is a Free Platform for all CBSE Students to get access to Free sample papers and Study Material from our Wide Range of Study Materials. (d) G = 6.67 x 10-11 N m2 (kg)-2 = …. A calorie is a unit of heat or energy and it equals about 4.2 J where 1 J = 1 kgm2 s-2. Find the power consumed by the lamp. Answer: Question 2. From the figure, Question 2. Calculate the diameter of Jupiter. Question 5. (b) A Jet plane moves with a speed greater than that of a super fast train. By equating powers of M, L and ‘ T only three independent equations will be obtained and they cannot give values of the four Short Answer Type Questions Relative error in the volume of block. 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. $$\begin{array}{l}{\text { (b) The total surface area of a cylinder of radius } r \text { and height } h \text { is }} \\ {S=2 \pi r(r+h)} \\ {\text { Given that, }} \\ {r=2 \mathrm{cm}=2 \times 1 \mathrm{cm}=2 \times 10 \mathrm{mm}=20 \mathrm{mm}} \\ {h=10 \mathrm{cm}=10 \times 10 \mathrm{mm}=100 \mathrm{mm}} \\ {\therefore S=2 \times 3.14 \times 20 \times(20+100)=15072=1.5 \times 104 \mathrm{mm} 2}\end{array}$$ UP Board students are also using NCERT Textbooks, so they also can download UP Board Solution for Class 11 Maths Chapter 2 in Hindi Medium free. We have to try to make permutations and combinations of the universal constants and see if there can be any such combination whose dimensions come out to be the dimensions of time. A great physicist of this century (P.A.M. Dirac) loved playing with numerical values of fundamental constants of nature. 18. 11.3 g/cm³ = 11.3 x 10. kg/m³, Ans : \begin{aligned}(a) 1 \mathrm{kg} \mathrm{m}^{2} \mathrm{s}^{-2} &=\frac{1 \mathrm{kg} \mathrm{m}^{2}}{s^{2}}=\frac{1 \times 1000 \times\left(10^{2}\right)^{2}}{s^{2}} \mathrm{g} \mathrm{cm}^{2} \\ &=10^{7} \mathrm{g} \mathrm{cm}^{2} \mathrm{s}^{-2} \end{aligned} If x = at2 + bt + c; where x is displacement as a function of time. V(max) = (1.37 + 0.01) x (4.11 + 0.01) x (2.56 + 0.01) cm3 = (1.38 x 4.12 x 2.57) cm3 = 14.61 cm3 Now. Question 26. Download Class 11 Physics NCERT Solutions in pdf free. In what range do you expect the mass density of the Sun to be, in the range of densities of solids and liquids or gases? 12. Its density is ______g a-n 30r ______kg m⁻⁵. Thus, the correct value of one light year = 9.46 x 1015 m. Question 9. Parallax angle subtended by the star Alpha Centauri at the given basis θ = 1.32 x 2 = 2.64″. Can a physical quantity have dimensions but still have no units? Question 4. where n1 and n2 are number of particles per unit volume for the value of x1 and x2 The radius of curvature of a concave mirror, measured by a spherometer is given by R=l2/6h +h/2 We hope the NCERT Solutions for Class 11 Physics Chapter 2 Units and Measurements help you. (e) This is a correct statement. Answer:  (a) Wrap the thread a number of times on a round pencil so as to form a coil having its turns touching each other closely. .•. Answer: Units of those physical quantities which are derived from the fundamental units are called derived units. unit of time is ys. Answer: (a) Least count of vernier callipers = 1/20 = 0.05 mm = 5 x 10-5 m (b) Difference of mass = 2.17 – 2.15 = 0.02 g 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. A LASER is source of very intense, monochromatic, and unidirectional beam of light. .’. d = 1/2ct = 1/2 x 3 x 108 x 8.2 x 60 m (f) This is a correct statement. $$\begin{array}{l}{\text { (c) Using the conversion, }} \\ {1 \mathrm{km} / \mathrm{h}=\frac{5}{18} \mathrm{m} / \mathrm{s}} \\ {18 \mathrm{km} \mathrm{h}=18 \times \frac{5}{18}=5 \mathrm{m} / \mathrm{s}}\end{array}$$ P.A.M. Dirac, a great physicist of 20th century found that from the following basic constants, a number having dimensions of time can be constructed: A body travels uniformly a distance of (13.8 ± 0.2) m in a time (4.0 ± 0.3) s. 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