Question : Communication is the process of

(a) keeping in touch
(b) exchange information
(c) broad casting
(d) entertainment by electronics

Answer= B 

Question : Which of the following is the element of a communication system?

(a) Transmitter (b) channel
(c) Receiver      (d) All of the above

Answer= D 

Question : The constituents of nucleus are

(a) electrons and protons
(b) protons and neutrons
(c) neutrons and electrons
(d) electrons, protons and neutrons

Answer=B 

Question : The radius of a nucleus is

(a) directly proportional to its mass number
(b) inversely proportional to its atomic weight
(c) directly proportional to the cube root of its mass number
(d) None of these

Question : A strong argument for the particle nature of cathode rays is that they

(a) produce fluoroscence
(b) travel through vacuum
(c) get deflected by electric and magnetic fields
(d) cast shadow

Answer=C

Question : In an electron gun the control grid is given a negative potential relative to cathode in order to

Question : The light reflected by a plane mirror may form a real image

(a) if the rays incident on the mirror are diverging
(b) if the rays incident on the mirror are converging
(c) if the object is placed very close to the mirror
(d) under no circumstances

Answer=B

Question : In image formation from spherical mirrors, only paraxial rays are considered because they

Question: Alternating current cannot be measured by D.C. ammeter, because

(a) A. C. is virtual
(b) A. C. changes its direction
(c) A. C. cannot pass through D.C. ammeter
(d) average value of A. C for complete cycle is zero

Answer=D

Question: A.C. power is transmitted from a power house at a high voltage as