NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics: Questions 719  722 of 2142
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Question number: 719
» Experimental Skills » Screw Gauge
Question
The two particles X and Y, initially at rest, start moving towards each other under mutual attraction. If at any instant the velocity of X is V and that of Y is 2V, the velocity of their center of mass will be 3
Choices
Choice (4)  Response  

a.  0 

b.  V 

c.  V/2 

d.  2V 

Question number: 720
» Electromagnetic Induction & Alternating Currents » Alternating Currents
Question
The voltage across a pure inductor is represented by the following diagram. Which one of the following diagrams will represent the current?
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 721
» Electromagnetic Induction & Alternating Currents » Peak and RMS Value of AC
Question
If an alternating voltage is represented as E = 141 sin (628t), then
(1) The rms voltage is 141V
(2) The rms voltage is 100V
(3) The frequency is 50 Hz
(4) The frequency is 100 Hz
Select the correct answers and mark it according to the following codes:
Choices
Choice (4)  Response  

a.  1,2 and 3 are correct 

b.  1 and 2 are correct 

c.  1 and 3 are correct 

d.  2 and 4 are correct 

Question number: 722
» Electromagnetic Induction & Alternating Currents » Peak and RMS Value of AC
Question
The r. m. s. value of an ac of 50 Hz is 10 A.
(1) Time taken by the alternating current in reaching from zero to maximum value is 5 x 10 ^{3} sec
(2) Time taken by the alternating current in reaching from zero to maximum value is 2 x 10 ^{3} sec
(3) The peak current is 14.14 A
(4) The peak current is 7.07 A
Select the correct answers and mark it according to the following codes:
Choices
Choice (4)  Response  

a.  1,2 and 3 are correct 

b.  1 and 3 are correct 

c.  1 and 2 are correct 

d.  2 and 4 are correct 
