Help with these electric multiple choice questions! please?

Question

1. An important safety precaution you should take before starting
any electrical servicing job is to make sure that your
A. tools are unbreakable.
B. fingers are not oily.
C. body is not grounded.
D. clothing is not moist.

2. Before you touch a wire in an appliance, how should you
make sure that it is NOT hot?
A. By plugging in the line cord and closing the appliance
switch
B. By checking for voltage with a neon tester
C. By touching the grounded and black wires and watching
for a spark
D. By testing for leakage with an ohmmeter

3. A soldering iron used for electrical repair jobs will work
properly if its tip is
A. covered with flux before being heated.
B. clean and tinned with melted solder.
C. oxidized and coated with solder.
D. made smooth with a file.

4. Your workbench should be made of
A. steel, for strength. C. plastic, for low cost.
B. aluminum, for light weight. D. wood, for insulation.

5. The recommended flux for electrical soldering is
A. antimony. C. sal ammoniac.
B. muriatic acid. D. rosin.

6. For home service calls, the ideal soldering tool is
A. a soldering gun. C. a gas torch.
B. a soldering iron. D. an alcohol torch.

7. Which one of the following tin-lead solders has the lowest melting point?
A. 40/60 C. 60/40
B. 50/50 D. 70/30

8. A properly made and cooled solder joint will have the solder
A. formed in balls.
B. covered with flux.
C. with a slightly frosted appearance.
D. with a mirror like surface.

9. Side-cutters or diagonal cutting pliers should be used to cut
A. bolts. C. wire.
B. nails. D. screws.

10. The incandescent test lamp is used to check for the presence of
A. DC current. C. DC voltage.
B. AC current. D. AC voltage.

Answer 1

1. An important safety precaution you should take before starting

any electrical servicing job is to make sure that your

C. body is not grounded.

It is the closest to a correct answer.

The correct answer is to lock out and tag out any equipment, or just unplug it.



2. Before you touch a wire in an appliance, how should you

make sure that it is NOT hot?

E. none of the above. Make sure it is unplugged



3. A soldering iron used for electrical repair jobs will work

properly if its tip is

B. clean and tinned with melted solder.



4. Your workbench should be made of

D. wood, for insulation.



5. The recommended flux for electrical soldering is

D. rosin.



6. For home service calls, the ideal soldering tool is

A. a soldering gun.



7. Which one of the following tin-lead solders has the lowest melting point?

A. 40/60



8. A properly made and cooled solder joint will have the solde.r

D. with a mirror like surface.



9. Side-cutters or diagonal cutting pliers should be used to cut

C. wire.



10. The incandescent test lamp is used to check for the presence of

C. DC voltage.

.D. AC voltage.



Wingman

Answer 2

1. C Body is not grounded

2. B. By checking for voltage with a neon tester

3. B. Clean and tinned with melted solder.

4. D. Wood, for insulation.

5. D Rosin

6. A or B

7. C. 60/40 (see the graph on the link) 40/60 has a higher melting point.

8. D. With a mirror like surface

9. C Wire

10. C and D AC and DC voltage

Answer 3

E = kq/r² I would assume since q is not squared, it would just be 1/2. My answer would be C, since one charge has the lines converging inward, while the other one is radiating them outward.