CBSE Class 12 Operation And Maintainence Of Communication Devices Question Paper 2019

CBSE Class 12 Operation And Maintainence Of Communication Devices Question Paper 2019. Students can download the last year board exams question papers using the link below. Free download of examination question papers with solutions. Last 10 year question papers should be practised to get better marks in examinations.

SECTION A

1. Modulating frequency is

(a) Higher than carrier frequency

(b) Lower than carrier frequency

(c) Equal to carrier frequency

(d) Can have any value

2. In free space, the speed of electromagnetic waves is

(a) 300 metres/second

(b) 3 × 10⁴ metres/second

(c) 1 × 10 metres/second

(d) 3 × 10⁸ metres/second

3. VHF signals propagate through

(a) Ionosphere

(b) Troposphere

(c) Surface of the earth

(d) Waveguide

4. In a cellular mobile system, the shape of the cells is

(a) Circular

(b) Hexagonal

(c) Pentagon

(d) Rectangular

5. A geostationary satellite takes one round of its orbit in

(a) One hour

(b) Four hours

(c) Twelve hours

(d) Twenty-four hours

6. The source of electrical power in a satellite system is

(a) Battery Cells

(b) Generators

(c) Solar Panels 

(d) Fuel Cells

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