The peak value of an alternating e.m.f. E is given by is 10 volts and its frequency is 50 Hz. At time , the instantaneous e.m.f. is
(1) 10 V
(2)
(3) 5 V
(4) 1 V
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIf a current I given by flows in an ac circuit across which an ac potential of has been applied, then the power consumption P in the circuit will be
(1)
(2)
(3)
(4) P = 0
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA resistance of 20 ohms is connected to a source of an alternating potential, V = 220sin(100πt). The time taken by the current to change from its peak value to its r.m.s value will be:
1. 0.2 sec
2. 0.25 sec
3. 25 × 10–3 sec
4. 2.5 × 10–3 sec
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAn alternating current of frequency ‘f’ is flowing in a circuit containing a resistance R and a choke L in series. The impedance of this circuit will be:
1. R + 2πfL
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA resistance of 300 Ω and an inductance of henry are connected in series to an ac voltage of 20 volts and a 200 Hz frequency. The phase angle between the voltage and current will be:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn a region of uniform magnetic induction B = 10–2 tesla, a circular coil of radius 30 cm and resistance π2 ohm is rotated about an axis that is perpendicular to the direction of B and which forms a diameter of the coil. If the coil rotates at 200 rpm the amplitude of the alternating current induced in the coil is :
(1) 4π2 mA
(2) 30 mA
(3) 6 mA
(4) 200 mA
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn a LCR circuit having L = 8.0 henry, C = 0.5 μF and R = 100 ohm in series. The resonance frequency in radian per second is
(1) 600 radian/second
(2) 600 Hz
(3) 500 radian/second
(4) 500 Hz
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe impedance of a circuit consists of 3 ohm resistance and 4 ohm reactance. The power factor of the circuit is :
(1) 0.4
(2) 0.6
(3) 0.8
(4) 1.0
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe power factor of a good choke coil is:
(1) Nearly zero
(2) Exactly zero
(3) Nearly one
(4) Exactly one
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyL, C and R represent physical quantities inductance, capacitance and resistance respectively. The combination representing the dimension of frequency will be:
1. LC
2. (LC)–1/2
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology