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# SSC Scientific Assistant Electronics Previous Year Questions 141 to 160

Hi students, Welcome to Amans Maths Blogs (AMBIPi). Are you preparing for SSC Scientific Assistant and looking for SSC Scientific Assistant Electronics Questions 141 to 160 with Answer Keys? In this article, you will get previous year questions of SSC Scientific Assistant IMD (Indian Meteorological Department), which helps you in the preparation of government job of SSC IMD Scientific assistant.

## SSC Scientific Assistant IMD Previous Year Questions

SSC Scientific Assistant Electronics Question No: 141

What is the simplest expression for the k-map shown in the figure given below ?

Option A : X = B + AC

Option B : X = ABC + ABC

Option C : X = AB + AB

Option D : X = AB

Option

SSC Scientific Assistant Electronics Question No: 142

What is the output for the network given below ?

Option A :X = ((A+B)C)D

Option B : X = ((A+B)(C+D)

Option C : X = A+(B+(CD))

Option D : X = ((AB)+C)+D

Option D : X = ((AB)+C)+D

SSC Scientific Assistant Electronics Question No: 143

The group of bits 01010 is a serially shifted (right-most bit first) into a 5-bit parallel output shift register with an initial state of 01111. What is the value contained in the register after 2 clock pulses ?

Option A : 01010

Option B : 01011

Option C : 01001

Option D : 10011

Option D : 10011

SSC Scientific Assistant Electronics Question No: 144

What is the number of flip-flops required to produce a divide by-64 device ?

Option A : 4

Option B : 5

Option C : 6

Option D : 7

Option C : 6

SSC Scientific Assistant Electronics Question Paper No: 145

What is the Dew Morgan’s equivalent to the expression  ABCD ?

Option A : ABCD

Option B : A + B + C +D

Option C : A + B + C + D

Option D : A + (B + (CD))

Option

SSC Scientific Assistant Electronics Question No: 146

What is the nature of waves generated by the transmitting antenna in a radio communication ?

Option A : Plane

Option B : Rectangular

Option C : Square

Option DSpherical

Option D: Spherical

SSC Scientific Assistant Electronics Question No: 147

What is the change in direction (dB) of a half wave dipole antenna ?

Option A : 1.76

Option B : 2.15

Option C : 6.25

Option D : 13.46

Option B : 2.15

SSC Scientific Assistant Electronics Paper No: 148

What is NOT an property of an end fire array?

Option A : It uses two half waves dipoles at distance of one half wavelength

Option B : Provide narrower beam width than broad side array

Option C : The gain is less than that of array

Option D : It is a stacked collinear antenna

Option D : It is a stacked collinear antenna

SSC Scientific Assistant Electronics Paper No: 149

What is NOT an application of a parabolic antenna ?

Option A : Direct television broadcast

Option B : Used as cellular microwave link

Option C : Wi- Fi – link

Option D : Satellite communication

Option C : Wi – Fi link

Previous Year Question SSC Scientific Assistant Electronics: 150

Which among the following components are used n the Yagi antenna ?

Option A : Dipole, one reflector and many directors

Option B : One reflector and one director

Option C : One director

Option D : Two reflectors

Option A : Dipole, one reflector and many directors

SSC Scientific Assistant Electronics Question No: 151

Which of the following factors affects the propagation level of an EM wave travelling from a transmitter to a receiver ?

A. Curvature of earth

B. Roughness of earth

C. Magnetic field of earth

Option A : 1

Option B : 2

Option C : 3

Option D : 1, 2 and 3

Option D : 1, 2 and 3

SSC Scientific Assistant Electronics Question No: 152

Choose which propagation of medium can handle VHF and UHF.

1. Ground wave propagation

2. Sky wave propagation

3. Space wave propagation

Option A : 1 only

Option B : 2 only

Option C : 3 only

Option D : Both 1 and 2

Option C : 3 only

SSC Scientific Assistant Electronics Previous Year Question No: 153

Select the correct order of the following atmospheric zones on the basis of the numbers of free electrons residing in them

Option ATroposphere > Stratosphere > Ionosphere

Option B : Ionosphere > Stratosphere > Troposphere

Option C : Stratosphere > Troposphere > Ionosphere

Option D : Stratosphere > Ionosphere > Troposphere

Option B : Ionosphere > Stratosphere > Troposphere

SSC Scientific Assistant Electronics Question No: 154

What is the frequency range of low frequency ?

Option A : 30 – 300 Hz

Option B : 300 – 3000 Hz

Option C : 3 – 30 kHz

Option D : 30 – 300 kHz

Option D : 30 – 300 kHz

SSC Scientific Assistant Electronics Paper No: 155

Which properties can be varied in a modulation for the addition of information to a carrier signal ?

1. Amplitude

2. Frequency

3. Phase

4. Polarization

Option A : 1 and 2 only

Option B : 2 only

Option C : 1 , 2 and 3 only

Option D : 1, 2 , 3 and 4

Option D : 1 ,  2 , 3 and 4

SSC Scientific Assistant Electronics Previous Year Paper Question No: 156

Which of the following in NOT a type of analog modulation ?

Option A : PPM

Option B : AM

Option C : FM

Option D : PM

Option A : PPM

SSC Scientific Assistant Electronics Previous Year Paper Question No: 157

What is the total power (in W) of an 80% DSB- SC modulated carrier wave having a power of 120 W ?

Option A : 34.4

Option B : 38.4

Option C : 42.4

Option D : 46.4

Option B : 38.4

SSC Scientific Assistant Electronics Year Question Paper No: 158

An AM wave has the lowest frequency component of 790 Hz with an 90 Hz wide band. What is the carrier frequency of the wave ?

Option A : 700 Hz

Option B : 745 Hz

Option C : 835 Hz

Option D : 935 Hz

Option C : 835 Hz

SSC Scientific Assistant Electronics Question Paper No: 159

The maximum transmission efficiency of an sinusoidal AM signal is ?

Option A : 21.68 %

Option B : 33.33 %

Option C : 58.88 %

Option D : 65.55 %

Option B : 33.33 %

Previous Year Question SSC Scientific Assistant Electronics: 160

In which of the following does radio waves propagates ?

Option A : EM waves

Option B : Fiber optic cables

Option C : Insulators

Option D : Water