CBSE Class 11 Sample Papers, Syllabus, Test Papers & NCERT Solutions

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Physics Class 11 Question Answer Chapter 14 Waves CBSE

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 […]

Physics Class 11 Question Answer Chapter 13 Oscillations CBSE

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 […]

Physics Class 11 Question Answer Chapter 12 Kinetic Theory CBSE

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 […]

Physics Class 11 Question Answer Chapter 11 Thermodynamics CBSE

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 […]

Physics Class 11 Question Answer Chapter 10 Thermal Properties of Matter CBSE

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 […]

Physics Class 11 Question Answer Chapter 8 Mechanical Properties of Solids CBSE

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 […]

Biology Class 11 Question Answer Chapter 19 Chemical Coordination & Integration CBSE

Q1. Define the following: (a) Exocrine gland Exocrine glands are glands that have ducts and secrete their products onto an epithelial surface or into body cavities. Examples include salivary glands, sweat glands, and sebaceous glands. (b) Endocrine gland Endocrine glands are ductless glands that release hormones directly into the bloodstream, which then travel to target […]

Biology Class 11 Question Answer Chapter 18 Neural Control and Coordination CBSE

Q1. Briefly describe the structure of the brain. Answer :  The brain is the central information-processing organ of the body, protected by the skull and cranial meninges (dura mater, arachnoid, and pia mater). It has three major parts: 1. Forebrain The forebrain is the largest and most complex part of the brain, consisting of the […]