FSC Physics MCQs Part 1 Physics Part 2 HSSC Pre Medical Pre Engineering text Book Questions first year and second-year Physics mcqs

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Weber is the unit of
A. Magnetic field intensity B. magnetic induction
C. magnetic flux D. self-inductance
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[explanation]C[/explanation]
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emf induced in a circuit according to Faradays law depends on the
A. maximum magnetic flux B. rate of change of magnetic flux
C. change in magnetic flux D. initial magnetic flux
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[explanation]B[/explanation]
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An alternating current or voltage
A. fluctuates off and on B. varies in magnitude alone
C. changes its direction again and again D. changes its magnitude continuously and reverses its direction of flow after regularly recurring intervals.
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[explanation]D[/explanation]
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Which one of the following functions like a motor?
A. galvanometer B. ammeter
C. voltmeter D. all of above
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[explanation]D[/explanation]
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If the coil is wound on an iron core the flux through it will
A. decrease B. become zero
C. remain the same D. increase
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[explanation]D[/explanation]
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Which of the following uses electric energy and does not convert it into any other form?
A. transformer B. motor
C. D.C generator D. A.C generator
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[explanation]A[/explanation]
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A.C and D.C have the same
A. effect in charging a capacitor B. effect in charging a battery
C. effect while passing through an inductance D. heating effect through a resistance
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[explanation]D[/explanation]
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A metal rod of 25 cm length is moving at a speed of 0.5/sec in direction perpendicular to 0.25T magnetic field. Emf produced in the rod is
A. 0 volt B. 3.125 volt
C. 31.25 volt D. 0.03125 volt
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[explanation]D[/explanation]
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The self-inductance of a solenoid is increased when a soft iron core is inserted into it. This is because the soft iron core
A. Decreases the resistance of the solenoid B. Reduces the effect of eddy current
C. Improves the flux linkage between the turns of the coil D. Increases the mutual inductance between the solenoid and the core
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[explanation]C[/explanation]
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An aeroplane of wingspan 10m flies from the equator towards the North Pole. The wings are perpendicular to the vertical component of the earths magnetic field (B = 4×10-5T). At maximum speed an emf of 96mV is induced across the wing tips. The maximum speed of the aeroplane is
A. 150msec-1 B. 384msec-1
C. 38.4msec-1 D. 200msec-1
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[explanation]B[/explanation]
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