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1. In how many ways, radiowave is propagated from the transmitting to the receiving antenna?

(a) 1
(b) 2
(c) 3
(d) 4

2. The physically larger region in a transistor, is

(a) emitter
(b) base
(c) both a and c
(d) collector

3. A diffraction pattern is obtained using a beam of red light. What happens if the red light is replaced by blue light?

(a) diffraction pattern becomes broader and farther apart
(b) no change
(c) bands disappear
(d) diffraction pattern becomes narrower and crowded together

4. Electromagnetic disturbances can be propagated through space

(a) with the help of gravitational force only
(b) with the help of ether medium only
(c) without the help of material medium
(d) with the help of air medium only

5. In a Colpitt’s oscillator circuit

(a) no capacitor is used
(b) no tuned LC circuits is used
(c) tapped coil is used
(d) capacitive feedback is used

6. The circuit capable of manifying the amplitude of weak signals is called

(a) oscillator
(b) rectifier
(c) amplifier
(d) none of the above

7. The process of addition of a very small amount of impurity into an intrinsic semiconductor is called

(a) alloying
(b) mixing
(c) doping
(d) none of these

8. A steady d.c. output voltage can be obtained with the help of

(a) d.c. alternator
(b) rectifier circuits
(c) filter networks
(d) none of the above

9. When ultraviolet light is incident on certain substances they emit visible light. This phenomenon is called

(a) raman effect
(b) photoelectric effect
(c) phosphorescence
(d) fluorescence

10. When light from sodium vapour lamp illuminates the slit of spectrometer, the images of the slit obtained in the yellow region of the spectrum is called

(a) continuous spectrum
(b) spectrum of sodium
(c) characteristic spectrum
(d) absorption spectrum

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