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Mdcat-past-papers - DUHS - Physics Quiz

Filters: Board: DUHS | Subject: Physics |
81. On which principle does the transformer work?



82. If a transformer has 500 turns on primary coil and 250 turns on secondary coil, then:



83. Induced EMF in A.C. generator can be increased by:



84. The main function of a transformer is to convert:



85. 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:



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



87. A semiconductor diode can be used as:



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



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



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



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



92. Half life of radon gas is:



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



94. 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 :



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



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



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



98. The skin cancer can be caused by:



99. The force responsible for binding the nucleus:



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