Related Questions

Why does the ionosphere of the Earth's atmosphere facilitate radio communication? i. The presence of ozone causes the reflection of radio waves to earth ii. Radio waves have a very long wavelength
A i only
B ii only
C both i & ii
D neither i nor ii
Giving is better than receiving. Here the word ‘receiving’ is a/an-
A adjective
B common noun
C gerund
D present participle
Which of the following is multiband HF receiving antenna?
A Square loop
B Log-periodic
C Conical horn
D Folded dipole
Which antenna is a wideband antenna?
A Hertz antenna
B Marconi antenna
C Folded dipole
D None of the above
A Yagi antenna has a driven antenna
A Only
B With a reflector
C With one or more directors
D With a reflector and one or more directors
How much times a sound stay in our brain after listening the sound ?
A 1 sec
B 0.1 sec
C 0.01 sec
D 0.001 sec
If Bashar can run around a ground four times in 20 minutes and Rahim can run around the same ground three times in 12 minutes, who can run around that ground more times in an hour, and how many times more can he run around ?
A Bashar, three times more
B Rahim , three times more
C They both go around 12 times
D Bashar, eight times more
A special lottery is to be held to select the student who will live in the only deluxe room in a dormitory . There are 100 seniors, 150 juniors and 200 sophomres who applied. Each senior's junior's name , 2 times; and each sophomres who applied. Each senior's name is placed in the lottery 3 times; each junior's name ,2 times name, 2 times ; and each sphomore's name , 1 time . What is the probability that a senior's name will be chosen?
A 18
B 38
C 48 
D 28
Weight of Sona is four times that of Mona. Weight of Mona is 2.5 times of Hona. Weight of Hona is 1.5 times of Dhona. Weight of Dhona is 2.5 times of Rona. Who is the heaviest?
A Mona
B Sona
C Hona
D Dhona
If ‘Hs’ is the significant wave height, then the average wave height and highest wave height respectively are given by
A 0.6 Hs and 1.67 Hs
B 0.6 Hs and 1.87 Hs
C 1.27 Hs and 1.87 Hs
D 1.27 Hs and 1.67 Hs

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