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
Frequencies above ___________ kHz are called radio frequencies
A 2
B 10
C 50
D 200
দুটি সুসঙ্গত উৎস থেকে λ দৈর্ঘ্যের দুটি তরঙ্গ সমদশায় বের হয় । একটি বিন্দুতে যেখানে তরঙ্গ দুটি মিলিত হয় সেখানে তাদের দশা পার্থক্য 90° । তরঙ্গ দুটির অতিক্রান্ত পথ পার্থক্য তখন কত ? ( Two coherent sources emit waves of wavelength λ which are in phase. which are in phase. The two waves meet at a point where they have a phase difference of 90°. Which of the following could be the traversed path difference between the waves?)
A 2λ
B λ
C λ/2
D λ/4
The lower and upper cut off frequencies are also called ___________ frequencies
A Sideband
B Resonant
C Half-resonant
D Half-power
A band-stop filter passes frequencies between its lower and upper critical frequencies and rejects all others.
A True
B False
The rainfall in January and February was 2.5 inches and 4.0 inches respectively. What was the % increase in rainfall in February?
A 35
B 45
C 60
D 40
Why does Western Ghats and Eastern Ghats both receive sufficient rainfall but Deccan Plateau receives scanty rainfall?
A It is a rain shadow area
B It is located parallel to wind direction
C It is away from the coast
D Rain bearing clouds are absent
Average annual rainfall at any station is the average of annual rainfall over a period of
A 14 years
B 21 years
C 28 years
D 35 years
Taking into account the amount of rainfall occurring from June to September, which one of the following is the correct order of cities in terms of rainfall?
A Kolkata > Ahmedabad > Allahabad
B Kolkata > Allahabad > Ahmedabad
C Allahabad > Kolkata > Ahmedabad
D Ahmedabad > Kolkata > Allahabad
The equatorial regions receive rainfall throughout the year. The annual rainfall is generally about ________
A 80 cms
B 160 cms
C 200 cms
D 250 cms

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