Explore topic-wise MCQs in Testing Subject.

This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.

1.

The ability of a material to maintain a magnetized state (without the presence of a magnetizing force) is called hysteresis.

A. 1
B.
Answer» C.
Discussion
2.

The Hall voltage is the voltage created by a conductor moving through a magnetic field.

A. 1
B.
Answer» C.
Discussion
3.

The movable part in a relay is the _____.

A. plunger
B. armature
C. cone
D. brushes
Answer» C. cone
Discussion
4.

The ability of a material to maintain a magnetized state (without the presence of a magnetizing force) is called retentivity.

A. 1
B.
Answer» B.
Discussion
5.

The flux density is ___ when the magnetic flux is 9 µWb and the cross-sectional area of the magnetic field is 5 × 10–3 m2.

A. 1800 µT
B. 555.56 T
C. 9 µT
D. 5 × 10–3 T
Answer» B. 555.56 T
Discussion
6.

When the current through a coil reverses direction, the magnetic field around the coil _____.

A. does not change
B. disappears
C. increases in strength
D. reverses direction
Answer» E.
Discussion
7.

The Hall effect

A. is a phenomenon with no practical applications
B. is used in various sensor applications
C. can develop potentials of thousands of volts
D. is the basis for solar cell operation
Answer» C. can develop potentials of thousands of volts
Discussion
8.

The unit of magnetic flux density is the weber.

A. 1
B.
C. 1
D.
Answer» C. 1
Discussion
9.

How much flux is there in a magnetic field when its flux density is 5000 T and its cross-sectional area is 300 mm2?

A. 16.67 mWb
B. 5.0 Wb
C. 3.0 mWb
D. 1.5 Wb
Answer» E.
Discussion
10.

What is the flux density of a magnetic field whose flux is 3000 µWb and cross-sectional area is 0.25 m2?

A. 12,000 T
B. 83,330 T
C. 0 T
D. More information is needed in order to find flux density.
Answer» B. 83,330 T
Discussion