NEET Physics: Questions 745  749 of 2098
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Question number: 745
» Electromagnetic Induction & Alternating Currents » Reactance and Impedance
Question
An inductive circuit contains resistance of 10Ω and an inductance of 20 H. If an ac voltage of 120 V and frequency 60 Hz is applied to this circuit, the current would be nearly
Choices
Choice (4)  Response  

a.  0.80 A 

b.  0.016 A 

c.  0.32 A 

d.  0.48 A 

Question number: 746
» Laws of Motion » Force and Inertia
Question
A body of mass 50 kg is pulled by a rope of length 8 m on a surface by a force of 108N applied at the other end. The force that is acting on 50 kg mass, if the linear density of rope is 0.5 kg/m will be –
Choices
Choice (4)  Response  

a.  108 N 

b.  92 N 

c.  116 N 

d.  100 N 

Question number: 747
» Electromagnetic Induction & Alternating Currents » Faraday's Law
Question
The magnetic flux passing perpendicular to the plane of the coil and directed into the paper is varying according to the relation , where is in milliweber and t is in second. Then the magnitude of emf induced in the loop when t = 2 second is
Choices
Choice (4)  Response  

a.  6 mV 

b.  31 mV 

c.  19 mV 

d.  14 mV 

Question number: 748
» Electromagnetic Induction & Alternating Currents » Reactance and Impedance
Question
A 20 volt ac is applied to a circuit consisting of a resistance and a coil with negligible resistance. If the voltage across the resistance is 12 V, the voltage across the coil is
Choices
Choice (4)  Response  

a.  6 volt 

b.  16 volt 

c.  8 volt 

d.  10 volt 

Question number: 749
» Electromagnetic Induction & Alternating Currents » Self and Mutual Inductance
Question
A current of 10 A in the primary coil of a circuit is reduced to zero at a uniform rate in 10 ^{3} second. If the coefficient of mutual inductance is 3H, the induced e. m. f. in the secondary coil will be,
Choices
Choice (4)  Response  

a.  3 kV 

b.  2 kV 

c.  30 kV 

d.  20kV 
