Physics Class 11 Solutions, MCQ, Notes, Book FREE PDF Download

14.1 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? Solution : Mass of the string, M = 2.50 […]

13.1 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 […]

12.1 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 3 Å. Solution : Diameter of an oxygen molecule, d = 3Å Radius, r = d/2 = 3/2 = 1.5 Å = 1.5 × 10–8 cm Actual volume occupied by […]

11.1 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 × 104 J/g? Solution : Water is flowing at a rate of […]

10.1 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. Solution : Kelvin and Celsius scales are related as: TC = TK – 273.15 … (i) Celsius and Fahrenheit scales are related as: TF = (9/5)TC + 32   ….(ii) For neon: TK = 24.57 K […]

9.1  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 […]

8.1 8.2 Figure 8.9 shows the strain-stress curve for a given material. What are (a) Young’s modulus and (b) approximate yield strength for this material? Answer :  8.3 The stress-strain graphs for materials A and B are shown in Fig. 8.10. (a) Which of the materials has the greater Young’s modulus? (b) Which of the […]

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Chapter 1 – Units and Measurement Chapter 2 – Motion in a Straight Line Chapter 3 – Motion in a Plane Chapter 4 – Laws of Motion Chapter 5 – Work, Energy And Power Chapter 6 – Systems of Particles and Rotational Motion Chapter 7 – Gravitation Chapter 8 – Mechanical Properties of Solids Chapter […]