Measurement and Instrumentation
A bridge circuit is shown in the figure below. Which one of the sentence given below is most suitable for balancing the bridge?

 First adjust R2 and then adjust R3.
 First adjust R4 and then adjust R2.
 First adjust R2 and then adjust R4.
 First adjust R4 and then adjust R1.

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Measurement and Instrumentation
The time/div and voltage axes of an oscilloscope have been creased. A student connects a 1 KHz, 5 V P-P square wave calibrition pulse to channel-1 of the scope and observes the screen to be as shown in the upper trace of figure. An unknown signal is connected to channel-2 (lower trace) of the scope. If the time/div and V/div on both channels are the same, the amplitude (P-P) and period of the unknown signal are respectively

 10 V, 1 ms.
  7.5 V, 2 ms.
 5 V, 1 ms.
 5 V, 2 ms.

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