PHYSICS 1. when an airplane passes overhead at high altitude little sound is heard because. 2. During the extraction of Fe what does CaCO3 do 3. permeability of an object less than that of free space is some of the options included diamagnetic paramagnetic etc 4. EMF in second winding Bond of semiconductor 5. The point of incomplete combustion in a flame is 6. What compound is used for fountain experiment in the options you have HCL 7. The best thermometer to use in a cold region options such as Alcohol, Mercury 8. Current leads voltage by what angle in the circuit above (there is a diagram inserted) then you have the options in π/2 and π 9. Insulators cannot conduct electricity because then you have options like the conduction band and gap 10. what is the use of a dielectric in a capacitor 11. what instrument measures AC and DC 12. which of the following is the best conductor of heat in the options you have copper, iron, etc 13. compositions of soft solder as an alloy 14. lenzes law is a demonstration of dash options like power transmission 15. what points would g be minimum where g is acceleration due to gravity and you have various distances from the particle and the surface of the Earth arranged in a table 16. what is the wave number if the wavelength equals 3 17. Elementary modern physics is the study of 18. The focal length of the eyepiece of a microscope is then you have options like long and shorts CHEMISTRY 1. what are the pollutants produced when petrol is spilled on plastic and ignited 2. what affects the rate of the composition of hydrogen peroxide 3. when pressure of vapor equals atmospheric pressure the liquid is said to be you have options like at room temperature at saturated temperature etc 4. what bond is between H2O and H^+ 5. what type of iron has low tensile strength 6. what is produced by the decarboxylation of phenyl metanoic 7. what happens when you mix an acid anhydride with conc nh3 8. what is the residual solid petrol used for and then you have options like cracking 9. detergents are straight hydrocarbons to make them_ you have options like soluble 10. what is produced by the reaction between slaked lime and chlorine the options are chlorinated water, bleaching powder, etc 11. what happens when 2,2-dimethylpropan1ol reacts with k2cr207 12. density of aluminum equals 2.7 g/cm³ what volume does 2 kg occupy MATHEMATICS 1. you have quite a few permutation and combination questions like the number of ways SEESAW can be arranged 2. you have gradient of a curve 3. you have a few shapes triangles particularly to identify the angles 4. you have some factorization 5. you also have quite a few decimal hexadecimal ENGLISH 1. Emphatic stress of Humility 2. Emphatic stress of Dominican 3. Rhyme of fountain 4. A synonym question on gaffe 5. The opposite of summer as used in a sentence 6. what was Bipi's bedtime 7. Chidi's talent 8. A few comprehension passages and fill in the gap > Excellence Academy ⚜️⚜️

Here are the answers to your questions: PHYSICS 1. When an airplane passes overhead at high altitude, little sound is heard because sound energy dissipates over a long distance and is absorbed by the atmosphere. 2. During the extraction of Fe, CaCO_3 (limestone) decomposes to CaO, which acts as a flux to remove acidic impurities like SiO_2 by forming slag (CaSiO_3). 3. Permeability of an object less than that of free space is diamagnetic. 4. EMF in a secondary winding (of a transformer) is induced due to the changing magnetic flux from the primary winding, according to