Measurement and Instrumentation
To the y input of a CRO a signal defined by 10sin100t is applied. To the x input the signal 10cos100t is fed. The gain for both x-channel and y-channel is the same. The screen shows

 a straight line.
 sinisoidal.
 an ellipse.
  a circle.

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Measurement and Instrumentation
Assertion (A): A hot wire ammeter has a cramped scale. Reason (R): The heat is proportional to square of current.

 A is ture and R is false.
 A is false and R is ture.
 Both A and R are true and R is correct explanation of A.
 Both A and R are true and R is not correct explanation of A.

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