NEET Physics: Questions 775  780 of 2099
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Question number: 775
» Work, Energy and Power » Work Done
Question
A force F = (3  1x + 5x ^{2}) N is applied on a 2 kg mass which displaces it from x = 0 to x = 2 m. Work done in joule is 
Choices
Choice (4)  Response  

a.  17.33  
b.  13  
c.  20.45  
d.  7.55 
Question number: 776
» Experimental Skills » Screw Gauge
Question
2 bodies of different masses of 2 kg and 4 kg are moving with, velocities 20 m/s and 10 m/s towards each other due to mutual gravitational attraction. What is the velocity of their center of mass?
Choices
Choice (4)  Response  

a.  8 m/s  
b.  6 m/s  
c.  Zero  
d.  5 m/s 
Question number: 777
» Electromagnetic Induction & Alternating Currents » Reactance and Impedance
Question
Energy stored in an inductor is proportional to (i= current in the inductor)
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 778
» Electromagnetic Induction & Alternating Currents » LCR Series Circuit
Question
A resistor and a capacitor are connected in series with an ac source. If the potential drop across the capacitor is 5 V and that across resistor is 12 V, applied voltage is,
Choices
Choice (4)  Response  

a.  12 V  
b.  17 V  
c.  13 V  
d.  5 V 
Question number: 779
» Electromagnetic Induction & Alternating Currents » Peak and RMS Value of AC
Question
If instantaneous current is given by amperes, then the r. m. s value of current is
Choices
Choice (4)  Response  

a.  4 ampere  
b. 
 
c.  zero ampere  
d. 

Question number: 780
» Electromagnetic Induction & Alternating Currents » Alternating Currents
Assertion (Ꭺ)
An alternating current does not show any magnetic effect.
Reason (Ꭱ)
Alternating current varies with time.
Choices
Choice (4)  Response  

a.  Ꭺ is false but Ꭱ is true  
b.  Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ  
c.  Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ  
d.  Both Ꭺ and Ꭱ are false 