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Mdcat-past-papers - DUHS Quiz

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141. A generator supplies 100 V to the primary coil of transformer. The primary has 150 turns and the secondary has 500 turns. The secondary voltage is:



142. "The emf induced in a closed circuit is directly proportional to the rate of change of magnetic flux passing through the circuit" refers to:



143. A semiconductor diode can be used as:



144. The process of converting an alternating current waveform into a direct current waveform is referred to as:



145. The potential difference applied across a diode to reduce depletion layer is:



146. Half life of a radioactive sample is given by:



147. In beta positive decay, the nuclear number is;



148. Half life of radon gas is:



149. When two negative Beta particles are emitted from a nucleus then the mass number :



150. A 40 gm radioactive material is placed in a chamber, having a half-life of 20 days. How much will be left after 80 days :



151. Which of the following electromagnetic radiation has the highest penetrating power ?



152. In nuclear reaction ₇N¹⁴ + ₂He⁴ → ₈O¹⁷ + __, the missing particle is:



153. Radiations are dangerous to living organisms because they damage the cell by:



154. The skin cancer can be caused by:



155. The force responsible for binding the nucleus:



156. The kinetic energy of an electron in first Bohr radius of H-atom is:



157. The experimental proof of particle nature of light is:



158. If Rydberg constant for hydrogen is R_H then wavelength λ of first line in Lyman series is:



159. The instantaneous emf generated by alternating current generator is written as:



160. The minimum energy of photon required for pair production is:



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