26. Name the EEG wave used for measuring depth of anaesthesia :
(4) Alpha wave (B) Beta wave
(C) Theta wave (0) Delta wave

27. Statements related to CRT are given below. Select the statement which is wrong :

(ക When cathode is heated it emits electrons and electrons are accelerated towards
phosphor screen

(B) Control grid is given a negative potential while focussing anode and aceelerating
anode are given positive potential

(0 Focussing anode converges the electron beam

(D) The positive potential on the phosphor screen determines the intensity of electron
beam

28. A moving coil galvanometer is converted into ammeter by connecting :
(A) A low resistance in series (B) A low resistance in parallel
(C) A high resistance in series (D) A high resistance in parallel

29. The audio frequency amplifier which has flat frequency response is :
(ക) RC coupled amplifier ४ (B) Transformer coupled amplifier
(C) Direct coupled amplifier (D) None of these

30. What are the features of transistors used in power amplifier?
(ക Thick base, small beta, metal casing (ए) Thin base, small beta, metal casing
(0 Thin base, large beta, plastic casing (D) Thick base, large beta, plastic casing

31. Tank circuit produces oscillations in an oscillator. Tank circuit of colpitt's oscillator has :
(ಗ) One capacitor and two inductors (B) Two capacitors and one inductor
(C) Three RC network (D) A transformer and two capacitors

32. Cut off frequencies determines the passband of a filter. Cut off frequencies ലട the
frequencies at which :

(ക) Distortion falls below 81.2% of maximum value
(B) Frequency falls below 70.7% of maximum value
(C) Noise falls below 81.2% of maximum value
(D) Gain falls below 70.7% of maximum value

33. Mutations that arise suddenly in nature are called :
(4) Chromosomal mutations (18) Induced mutations

(¢) Gene mutations (D)) Spontaneous mutations

51/2015 6 A