Related Questions

______ but also it filters out harmful sun rays.
A The atmosphere given us air to breathe
B Not only the atmosphere given us air to breathe
C The atmosphere which gives us air to breathe
D Not only does the atmosphere give us air to breathe
A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.
A Hydrogen
B Carbon dioxide
C Ozone
D None of these
Routers operate at layer _____. LAN switches operate at layer _____. Ethernet hubs operate at layer _____. Word processing operates at layer _____.
A 3, 3, 1, 7
B 3, 2, 1, none
C 3, 2, 1, 7
D 3, 3, 2, none
E All of the above
Which of the following harmful rays comes out from colour TV?
A Gama ray
B Beta ray
C Cosmic ray
D Alpha ray
Scientists have speculated that the destruction of Earth's ozone layer would--------- us to damaging ultraviolet rays.
A exposed
B have been exposed
C expose
D have been exposing
124λ তরঙ্গদৈর্ঘ্যের এক রঙা এক্সরে একটি কার্বণ ব্লক দ্বারা বিক্ষিপ্ত হয়। 180° তে এক্সবের বিক্ষিপ্ত বিকিরণের তরঙ্গদৈর্ঘ্যের মান নির্ণয় কর।(A monochromatic X-rays of wavelength 0.124λ is scattered by a carbon block. Find the wavelength of X-rays scattered through 180°) 
A 0.0484 λ
B 0.1724 λ
C 0.0756 λ
D 0.0242 λ
E 0.0968 λ
পৃথিবী পৃষ্ঠে একটি ইটের ওজন 81 N. পৃথিবীর অর্ধেক বাসার্ধের সমান উচ্চতায় এবং অর্ধেক বাসার্ধের সমান গভীরতায় ইউটির উপরে পৃথিবীর অভিকর্ষ বলের মান কত হবে?(A brick weighs 81 N on the surface of the earth. What are the earth's gravitational forces act on it at a height of half of the radius of the earth and at a depth of half of the radius of earth, respectively?)
A 36 N and 81 N
B 36 N and 40.5 N
C 36 N and 20.25 N
D 98 and 40.5 N
E 81 N and 81 N
The ozone layer is being destroyed by chlorofluorocarbons. In this regard which do you consider as the most harmful?
A Carbon atom
B Chlorine atom
C Fluorine atom
D The entire compound
Ozone layer in the upper parts of the atmosphere serves as a protective shield against harmful
A Solar ultraviolet radiation
B Solar infrared radiation
C CO2 in the air
D SO2 in the air
Which of the following pairs gives a correct combination of the useful and harmful constituents respectively of a good brick earth?
A Lime stone and alumina
B Silica and alkalies
C Alumina and iron
D Alkalies and magnesium

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