Physics MCQs

852 MCQs  (Page 46 of 86)

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Cosθi^ + Sinθj^ is a_________________?
A. Vector
B. Position vector
C. Vector in the direction at angle θ with an x-axis
D. The unit vector in the direction at angle θ with an x-axis
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Maximum number of components of a vector may be________________?
A. 1
B. 2
C. 3
D. Infinite
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Which one is not correct for a vector A= 2i+2j+3k ?
A. Has direction 45° with an x-axis
B. Has magnitude 2
C. Has magnitude 2 and direction °=45° with a y-axis
D. Has magnitude -2
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The resultant of two forces of equal magnitudes is also equal to the magnitude of the forces. The angle between the two forces is________________?
A. 30°
B. 60°
C. 90°
D. 120°
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An A.C series circuit containing 4Ω resistance and 3Ω inductive reactance. The impedance of the circuit is______________?
A. 1ω
B. 5ω
C. 7ω
D. 7ω
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An inductive coil has a resistance of 100Ω. When an AC signal of frequency 1000Hz is fed to the coil the applied voltage leads the current by 45Ω. What is the inductance of the coil ?
A. 10mh
B. 12mh
C. 16mh
D. 20mh
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Choose the correct statement. In the case of AC circuit ohms law holds for_______________?
A. Peak values of voltage and current
B. Effective values of voltage and current
C. Instantaneous values of voltage and current
D. All of the above
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The phase angle between the voltage and the current in an AC circuit consisting of a resistance is______________?
A. Zero
B. 45°
C. 90°
D. 180°
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n an LCR series circuit, if V is the effective value of the applied voltage VR is the voltage across R VL is the effective voltage across L & Vc is the effective voltage across C then_______________?
Ia. v = vr+vl+vc
B. V2 = vr2+vl2+vc2
C. V2 = vr2+(vl-vc)2
D. V2 = vl2+(vr-vc)2
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A voltage V = V0 cos ωt is applied across a resistor of resistance R the average power dissipated per cycle in the resistor is given by___________?
A. V√/√2r
B. V/√2√r
C. V02/√2r
D. 2/√2√r
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Word of the Day
23 Jul
Aisle
a passage between rows of seats in a building such as a church or theatre, an aircraft, or train.
طویل تنگ راستہ، نشتوں کے درمیان راستہ

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