Class 11 Physics Chapter 1 Physical World NCERT Solutions 1.1 Some of the most profound statements on the nature of science have come from Albert Einstein, one of the greatest scientists of all time. What do you think did Einstein mean when he said: “The most incomprehensible thing about the world is that it is …
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Exercise 16.1 Page: 386 In each of the following Exercises 1 to 7, describe the sample space for the indicated experiment. 1. A coin is tossed three times. Solution:- Since either coin can turn up Head (H) or Tail (T), the possible outcomes may be So, when 1 coin is tossed once the sample space …
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Exercise 15.1 Page: 360 Find the mean deviation about the mean for the data in Exercises 1 and 2. 1. 4, 7, 8, 9, 10, 12, 13, 17 Solution:- First we have to find (x̅) of the given data So, the respective values of the deviations from mean, i.e., xi – x̅ are, 10 – 4 …
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Exercise 14.1 page no: 324 1.Which of the following sentences are statements? Give reasons for your answer. (i) There are 35 days in a month. (ii) Mathematics is difficult. (iii) The sum of 5 and 7 is greater than 10. (iv) The square of a number is an even number. (v) The sides of a …
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Exercise 13.1 page no: 301 1. Evaluate the Given limit: Solution: Given Substituting x = 3, we get = 3 + 3 = 6 2. Evaluate the Given limit: Solution: Given limit: Substituting x = π, we get = (π – 22 / 7) 3. Evaluate the Given limit: Solution: Given limit: Substituting r = …
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EXERCISE 12.1 PAGE NO: 271 1. A point is on the x-axis. What are its y coordinate and z-coordinates? Solution: If a point is on the x-axis, then the coordinates of y and z are 0. So the point is (x, 0, 0). 2. A point is in the XZ-plane. What can you say about its y-coordinate? Solution: If a …
EXERCISE 11.1 PAGE NO: 241 In each of the following Exercise 1 to 5, find the equation of the circle with 1. Centre (0, 2) and radius 2 Solution: Given: Centre (0, 2) and radius 2 Let us consider the equation of a circle with centre (h, k) and Radius r is given as (x …
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EXERCISE 10.1 PAGE NO: 211 1. Draw a quadrilateral in the Cartesian plane, whose vertices are (– 4, 5), (0, 7), (5, – 5) and (– 4, –2). Also, find its area. Solution: Let ABCD be the given quadrilateral with vertices A (-4,5) , B (0,7), C (5.-5) and D (-4,-2). Now let us plot …
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Exercise 9.1 Page No: 180 Write the first five terms of each of the sequences in Exercises 1 to 6 whose nth terms are: 1. an = n (n + 2) Solution: Given, nth term of a sequence an = n (n + 2) On substituting n = 1, 2, 3, 4, and 5, we get the first five terms …
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NCERT Class 11 Maths Chapter 8 Exercise 8.1 Page No: 166 Expand each of the expressions in Exercises 1 to 5. 1. (1 – 2x)5 Solution: From binomial theorem expansion we can write as (1 – 2x)5 = 5Co (1)5 – 5C1 (1)4 (2x) + 5C2 (1)3 (2x)2 – 5C3 (1)2 (2x)3 + 5C4 (1)1 (2x)4 – 5C5 (2x)5 = 1 – 5 (2x) + 10 (4x)2 – 10 (8×3) + 5 ( 16 x4) – …
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