Electromagnetic Induction MCQ's 3

A test from chapter 15 i.e Electromagnetic induction of Physics part 2. This is Free online test for FSc and Entry test Preparation for UET, NUST, FAST, GIKI, PIEAS, NFC, Punjab University, UHS, other Engineering Universities and Medical Colleges.

1. A galvanometer can be converted into a voltmeter by connecting:

A) A high resistance in series
B) A low resistance in parallel
C) A low resistance in series
D) A high resistance in parallel

2. To convert a moving coil galvanometer into an ammeter one has to connect

A) A small resistance in series
B) A small resistance in parallel
C) A high resistance in series
D) A high resistance in parallel

3. Ohm meter is a device for directly measuring the resistance of conductor. It is a modification of:

A) A moving coil galvanometer
B) A voltmeter
C) A rheostat
D) All

4. The whetstone bridge is most sensitive when:

A) The ratio arm is equal to one
B) The ratio arm is equal to ten
C) Any value
D) Both A and B

5. Meter bridge is an application of:

A) Whetstone bridge
B) Potentiometer
C) Neither A nor B
D) Both A and B

6. A potentiometer is an ideal instrument for measurement of p.d. or e.m.f. because:

A) It has a long wire
B) It uses a sensitive galvanometer
C) It does not distribute the p.d. it measures
D) Both A) and B) are true

7. As for sensitiveness of a potentiometer:

A) Five wires potentiometer is better than ten wires
B) Ten wires potentiometer is better than four wires
C) Both A and B have similar merits
D) none

8. Sensitivity of the potentiometer can be increased by:

A) Increasing the e.m.f. of cell
B) Increasing the length of the potentiometer wire
C) Decreasing the length of the wire of potentiometer
D) None

9. A potentiometer is superior to a voltmeter for measuring a potential because

A) The voltmeter has high resistance
B) The resistance of the potentiometer wire is quite low
C) The potentiometer does not draw any current from the unknown source of e.m.f. to be measured
D) The sensitivity of potentiometer is higher than that of the voltmeter

10. Potentiometer is an ideal instrument to measure potential difference because:

A) At null point no current flows in the potentiometer wire
B) At null point no current flows in the main circuit
C) At null point no current flows in the secondary circuit
D) none