The earth’s plate responsible for causing earthquakes is
(a) the crust of the earth
(b) the mantle of the earth
(c) the inner core of the earth
(d) the outer core of the earth
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The dielectric strength of air is 3.0 x 10^6V/m. A parallel-plate air-capacitor has area 20cm^2 and plate separation 0.10mm.
E = 3 × 106V/m, A = 20cm2, d = 0.1mm Potential diff. across the capacitor = Ed = 3 × 106 × 0.1 × 10–3 = 300V Max. rms Voltage = V/√2 =...
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The plate current in a diode is 20mA when the plate voltage is 50V or 60V.
For plate current 20mA, we find the voltage 50V or 60V. Hence it acts as the saturation current. Therefore for the same temperature, the plate current is 20 mA for all other...
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The dynamic plate resistance of a triode valve is 10kΩ. Find the change in the plate current if the plate voltage is changed from 200V to 220V.
Dynamic Plate Resistance rp = 10KΩ = 104Ω δIp = ? δVp = 220 – 220 = 20V δIp = (δVp/rp)/ Vg = constant. = 20/104 = 0.002A = 2mA
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The study of earthquakes and their bearings on the internal structure of the Earth is called
(b) Seismology
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Which one among the following explains the earthquakes of the eastern margins of Asia? (a) Subduction of Pacific plate under Asiatic plate
(a) In 1906, Montessus de Bailore described the earthquakes and their characteristics within a specific region. It generally occurs by subduction of pacific plate under Asiatic plate and triggered a...
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Lithosphere covers 1. Continental crust 2. Oceanic crust 3 Upper solid part of mantle
The Right option is : (b) 1, 2 and 3
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Name the elements that help in creating phosphorous cycle? 1. Rocks 2. Earth crust 3. Air 4. Water
(a) Phosphorus cycle is also called as sedimentary cycle because the main reservoir is rocks and the earth crust.
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Explain the term "rancidity." Name the type of chemical reaction responsible for causing rancidity and define it.
When fats and oils are oxidised, the food becomes rancid i.e., their smell and taste changes. The type of chemical reaction is oxidation. Definition: Rancidity is the process of slow oxidation...
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Mention the percentage of carbon in earth's crust.
0.02% of carbon in earth's crust.
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A number of elements are available in earth’s crust but most abundant elements are ____________.
(i) Al and Fe
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