Class 11th Maths Chapter 1 Sets NCERT Solution is given below: Exercise 1.1 : Solutions of Questions on Page Number : 4 NCERT Solutions for Class 11 Maths Chapter 1 Sets Q1 : Which of the following are sets? Justify our answer. (i) The collection of all months of a year beginning with the letter J. (ii) The collection of ten most talented writers of India. (iii) A team of eleven best-cricket batsmen of the world. (iv) The collection of all boys in your class. (v) The collection of all natural numbers less than 100. (vi) A collection of novels written…
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Exercise : Solutions of Questions on Page Number : 388 Q1 :A string of mass 2.50 kg is under a tension of 200 N. The length of the stretched string is 20.0 m. If the transverse jerk is struck at one end of the string, how long does the disturbance take to reach the other end? Answer : Mass of the string, M = 2.50 kg Tension in the string, T = 200 N Length of the string, l = 20.0 m Mass per unit length, The velocity (v) of the transverse wave in the string is given by the…
Below are the NCERT Solution for Class 11 Physics Chapter 14 Oscillations Exercise : Solutions of Questions on Page Number : 358 Q1 :Which of the following examples represent periodic motion? (a) A swimmer completing one (return) trip from one bank of a river to the other and back. (b) A freely suspended bar magnet displaced from its N-S direction and released. (c) A hydrogen molecule rotating about its center of mass. (d) An arrow released from a bow. Answer : Answer: (b) and (c) (a) The swimmer’s motion is not periodic. The motion of the swimmer between the banks…
Exercise : Solutions of Questions on Page Number : 333 Q1 :Estimate the fraction of molecular volume to the actual volume occupied by oxygen gas at STP. Take the diameter of an oxygen molecule to be 3Å. Answer : Diameter of an oxygen molecule, d= 3Å Radius, r = 1.5 Å = 1.5 × 10-8cm Actual volume occupied by 1 mole of oxygen gas at STP = 22400 cm3 Molecular volume of oxygen gas, Where, N is Avogadro’s number = 6.023 × 1023 molecules/mole Ratio of the molecular volume to the actual volume of oxygen = 3.8 × 10-4 NCERT…
Exercise : Solutions of Questions on Page Number : 316 Q1 :A geyser heats water flowing at the rate of 3.0 litres per minute from 27 °C to 77 °C. If the geyser operates on a gas burner, what is the rate of consumption of the fuel if its heat of combustion is 4.0 x 104 J/g? Answer : Water is flowing at a rate of 3.0 litre/min. The geyser heats the water, raising the temperature from 27°C to 77°C. Initial temperature, T1 = 27°C Final temperature, T2 = 77°C ∴Rise in temperature, ΔT = T2 – T1 = 77 – 27=…
Exercise : Solutions of Questions on Page Number : 294 Q1 :The triple points of neon and carbon dioxide are 24.57 K and 216.55 K respectively. Express these temperatures on the Celsius and Fahrenheit scales. Answer : Kelvin and Celsius scales are related as: TC = TK – 273.15 … (i) Celsius and Fahrenheit scales are related as: … (ii) For neon: TK = 24.57 K ∴TC = 24.57 – 273.15 = -248.58°C For carbon dioxide: TK = 216.55 K ∴TC= 216.55 -273.15 = -56.60°C NCERT Solution for Class 11 Physics Chapter 11 Thermal Properties Of Matter Q2 :Two absolute scales A…
Exercise : Solutions of Questions on Page Number : 268 Q1 :Explain why (a) The blood pressure in humans is greater at the feet than at the brain (b) Atmospheric pressure at a height of about 6 km decreases to nearly half of its value at the sea level, though the height of the atmosphere is more than 100 km (c) Hydrostatic pressure is a scalar quantity even though pressure is force divided by area. Answer : (a) The pressure of a liquid is given by the relation: P = hρg Where, P = Pressure h = Height of the…
Exercise : Solutions of Questions on Page Number : 242 Q1 : A steel wire of length 4.7 m and cross-sectional area 3.0 x 10-5 m2 stretches by the same amount as a copper wire of length 3.5 m and cross-sectional area of 4.0 x 10-5 m2 under a given load. What is the ratio of the Young’s modulus of steel to that of copper? Answer : Length of the steel wire, L1 = 4.7 m Area of cross-section of the steel wire, A1 = 3.0 × 10-5 m2 Length of the copper wire, L2 = 3.5 m Area of…
NCERT Textbook Page Number: 201 Q1: Answer the following: (a) You can shield a charge from electrical forces by putting it inside a hollow conductor. Can you shield a body from the gravitational influence of nearby matter by putting it inside a hollow sphere or by some other means? (b) An astronaut inside a small space ship orbiting around the earth cannot detect gravity. If the space station orbiting around the earth has a large size, can he hope to detect gravity? (c) If you compare the gravitational force on the earth due to the sun to that due to…
NCERT Textbook Page Number: 178 Q1 :Give the location of the centre of mass of a (i) sphere, (ii) cylinder, (iii) ring, and (iv) cube, each of uniform mass density. Does the centre of mass of a body necessarily lie inside the body? Answer : Geometric centre; No The centre of mass (C.M.) is a point where the mass of a body is supposed to be concentrated. For the given geometric shapes having a uniform mass density, the C.M. lies at their respective geometric centres. The centre of mass of a body need not necessarily lie within it. For example,…