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.

Which of the following affect greatly the resistivity of electrical conductors?

A. Composition
B. Pressure
C. Size
D. Temperature
Answer» B. Pressure
Discussion
2.

Which of the following materials is the best conductor of electricity ?

A. Tungsten
B. Aluminium
C. Copper
D. Carbon
Answer» D. Carbon
Discussion
3.

By increasing impurity content in the metal alloy the residual resistivity always

A. Decreases
B. Increases
C. Remains constant
D. Becomes temperature independent
Answer» C. Remains constant
Discussion
4.

Due to which of the following factors the brush wear rate is altered?

A. Speed of the machine
B. Contact pressure
C. Surface conditions of brush and commutator
D. All of the above
Answer» E.
Discussion
5.

Which of the following materials is preferred for transmitting electrical energy over long distance ?

A. Copper
B. Aluminium
C. Steel reinforced copper
D. Steel reinforced aluminium
Answer» E.
Discussion
6.

Which of the following factors affect resistivity of metals ?

A. Age hardening
B. Alloying
C. Temperature
D. Cold work
E. All of the above
Answer» F.
Discussion
7.

Superconducting metal in super conducting state has relative permeability of

A. Zero
B. One
C. Negative
D. More than one
Answer» B. One
Discussion
8.

Is an element used in semiconductors whose atoms have three valence electrons.

A. An acceptor
B. A donor
C. Germanium
D. Silicon
Answer» B. A donor
Discussion
9.

A carbon resistor contains

A. Carbon crystals
B. Solid carbon granules
C. Pulverized coal
D. Finely divided carbon black.
Answer» E.
Discussion
10.

Effect of moisture on the insulating materials is to

A. Decrease dielectric constant
B. Decrease dielectric strength
C. Decrease insulation resistance
D. Increase dielectric loss
E. All of the above
Answer» F.
Discussion