Related Questions

Read the following passage carefully and then choose the right word to complete the sentence that follows. Rockets are very expensive as it can be used only once. Appled scientists have therefore develped a reusable space craft called a space shuttle which takes off like a rocket; however, does no get destroyed as it returns to earth. It can also be used to lunch satellired into space, retrieve them from space if any repairing os required and allow around 8 scientists to crryout experiments in space. The space shuttle does not get.
ক flattened
খ enlarged
গ ruined
ঘ developed
Which layer of the earth's atmosphere reflect back the radio waves to the earth's surface ?
ক Ionosphere
খ Stratosphere
গ Mesosphere
ঘ Exosphere
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.
ক Hydrogen
খ Carbon dioxide
গ Ozone
ঘ None of these
Routers operate at layer _____. LAN switches operate at layer _____. Ethernet hubs operate at layer _____. Word processing operates at layer _____.
ক 3, 3, 1, 7
খ 3, 2, 1, none
গ 3, 2, 1, 7
ঘ 3, 3, 2, none
ঙ All of the above
A satellite that simply reflect back the signals from one region of the earth to the other region is known as
ক Orbiting satellite
খ Geostationary satellite
গ Active satellite
ঘ Passive satellite
Which layer of of atmosphere contains the ozone layer?
ক Mesosphere
খ Stratosphere
গ Troposphere
ঘ Thermosphere
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?)
ক 36 N and 81 N
খ 36 N and 40.5 N
গ 36 N and 20.25 N
ঘ 98 and 40.5 N
ঙ 81 N and 81 N
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
ক i only
খ ii only
গ both i & ii
ঘ neither i nor ii
There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth's surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km.
ক 0.05
খ 1
গ 6.5
ঘ 15
The layer of atmosphere close the Earth's surface is called ----
ক Exosphere
খ Ionosphere
গ Stratosphere
ঘ Troposphere

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