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Quiz 5
Mdcat-past-papers - DUHS - Physics Quiz
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Board: DUHS | Subject: Physics |
81. On which principle does the transformer work?
Self Induction
Mutual induction
Motional EMF
Magnetic torque
82. If a transformer has 500 turns on primary coil and 250 turns on secondary coil, then:
Output voltage is half of input voltage
Output and input voltage are equal
Output voltage is double of input voltage
Output voltage is zero
83. Induced EMF in A.C. generator can be increased by:
Decreasing area of coil
Decreasing magnetic field
Increasing area of coil
Slowing down speed of coil
84. The main function of a transformer is to convert:
One direct voltage to another direct voltage of different magnitude
One alternating voltage to another alternating voltage of different magnitude
High value alternating voltage to a low value direct voltage
A low value alternating voltage to a high value direct voltage
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:
700 V
800 V
900 V
1000 V
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:
Lenz's Law
Faraday's law
Coulomb's Law
Ohm's Law
87. A semiconductor diode can be used as:
A full wave rectifier
An amplifier
A transmitter
A half wave rectifier
88. The process of converting an alternating current waveform into a direct current waveform is referred to as:
Amplification
Filtration
Attenuation
Rectification
89. The potential difference applied across a diode to reduce depletion layer is:
Reverse biasing
Forward biasing
Biasing voltage
Junction potential
90. Half life of a radioactive sample is given by:
T1/2 = λ / (0.693)
T1/2 = (0.693) / λ
T1/2 = (0.693)λ
T1/2 = √(0.693)
91. In beta positive decay, the nuclear number is;
Conserved
Not conserved
Unstable
Stable
92. Half life of radon gas is:
3.8 minutes
3.8 days
3.8 months
38 years
93. When two negative Beta particles are emitted from a nucleus then the mass number :
No change
Increases by 2
Increases by 1
Increases by 3
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 :
40 gm
5 gm
2.5 gm
2.5 gm
95. Which of the following electromagnetic radiation has the highest penetrating power ?
Alpha rays
Gamma rays
Beta rays
Proton rays
96. In nuclear reaction ₇N¹⁴ + ₂He⁴ → ₈O¹⁷ + __, the missing particle is:
Proton
Alpha particle
Electron
Positron
97. Radiations are dangerous to living organisms because they damage the cell by:
Producing ions in the cells
Increasing the temperature of cells
Decreasing the number of cells
Destroying the cells
98. The skin cancer can be caused by:
Alpha radiation
Beta radiation
Gamma radiation
Ultraviolet radiation
99. The force responsible for binding the nucleus:
Coulomb's force
Weak nuclear force
Newton force
Strong nuclear force
100. The kinetic energy of an electron in first Bohr radius of H-atom is:
13.6 eV
13.6 KeV
-13.6 eV
13.6 eV
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