Chapter 15 Communication Systems Question 1. At which of the following frequency/frequencies the communication will not be reliable for a receiver situated beyond the horizon: (a) 10 kHz (b) 10…
Chapter 14 Electronics Devices Question 1. In an n-type silicon, which of the following statement is true : (a) Electrons are majority carriers and trivalent atoms are the dopants. (b)…
Chapter 13 Nuclei Question 1. (a) Two stable isotopes of lithium 63Li and 73Li have respective abundance of 7.5% and 92.5%. These isotopes have masses 6.01512 u and 7.01600 u respectively. Find the atomic…
Chapter 12 Atoms Question 1. Choose the correct alternative from clues given at end of each statement: The size of the atom in Thomson’s model is the atomic size in…
Chapter 11 Dual Nature of Radiation and Matter Question 1. Find the (a) maximum frequency, and (b) minimum wavelength of X-rays produced by 30 kV electrons. Answer: Question 2. The…
Chapter 10 Wave Optics Question 1. Monochromatic light of wavelength 589 nm is incident from air on a water surface. What are the wavelength, frequency and speed of (a) reflected,…
Chapter 9 Ray Optics and Optical Instruments Question 1. A small candle 2.5 cm in size is placed 27 cm in front of a concave mirror of a radius of…
Chapter 8 Electromagnetic Waves Question 1. Figure shows a capacitor made of two circular plates each of radius 12 cm and separated by 5.0 cm. The capacitor is being charged…
Chapter 7 Alternating Current Question 1. A 100 Ω resistor is connected to a 220 V, 50 Hz ac supply. (a) What is the rms value of current in the…
Chapter 6 Electromagnetic Induction Question 1. Predict the direction of induced current in the situations described by the following Fig. 2(a) to (f). Answer: (a) By Lenz’s law, the face…