NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics: Questions 696  700 of 2142
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Question number: 696
» Electromagnetic Induction & Alternating Currents » Reactance and Impedance
Question
A 120 Volt ac source is connected across a pure inductor of inductance 0.70 H. If the frequency of the ac source is 60 Hz, the current passing through the inductor is
Choices
Choice (4)  Response  

a.  4.55 amp 

b.  3.55 amp 

c.  0.355 amp 

d.  0.455 amp 

Question number: 697
» Experimental Skills » Screw Gauge
Question
Two spheres of masses 2M and M are initially at rest at. Distance R apart. Due to mutual force of attraction, they approach each other. When they are at separation R/2, the acceleration of the center of mass of spheres would be
Choices
Choice (4)  Response  

a.  0 m/s ^{2} 

b.  gm/s ^{2} 

c.  12 gm/s ^{2} 

d.  3 gm/s ^{2} 

Question number: 698
» Electromagnetic Induction & Alternating Currents » Alternating Currents
Question
The instantaneous value of current in an A. C. circuit is . The current will be maximum for the first time at,
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 699
» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction
Question
Two rail tracks, insulated from each other and the ground, are connected to milli voltmeter. What is the reading of the milli voltmeter when a train passes at a speed of 180 km/hr along the track? Given that  the horizontal component of earth’s magnetic field B _{H} is 0.2 x 10 ^{4} Wb/m ^{2} and rails are separated by 1 meter.
Choices
Choice (4)  Response  

a.  1 V 

b.  10 mV 

c.  l mV 

d.  100 mV 

Question number: 700
» Laws of Motion » Force and Inertia
Question
In the above example, the velocity after 2 sec will be  (in m/sec)
Choices
Choice (4)  Response  

a.  10√3 

b.  10 

c.  5 

d.  5√3 
