Chapter 15 Communication Systems

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 MHz (c) 1 GHz (d) 1000 GHz Answer: (b) is correct. Here (c) and (d)...

Chapter 14 Electronics Devices

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) Electrons are minority carriers and pentavalent atoms are the dopants. (c) Holes...

Chapter 13 Nuclei

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 weight of lithium. (b) Boron has two stable...

Chapter 12 Atoms

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 Rutherford’s model.(much greater than/no different from/much less than.) In the ground state of……………...

Chapter 11 Dual Nature of Radiation and Matter

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 work function of caesium metal is 2.14 eV. When light of frequency 6 x 1014 Hz is...
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