4. hearing protection should be worn anytime the noise level exceeds
a. 60 db
b. 70 db
c. 80 db
d. 90 db

5. two technicians are discussing the safe use of a wrench. technician a says
that a wrench should be pulled toward you. technician b says that a
wrench should be pushed away from you. which technician is correct?
a. technician a only
b. technician b only
c. both technicians a and b
d. neither technician a nor b

6. exhaust hoses should be used because one of the exhaust gases is deadly in
high concentration. this gas is ________.
a. carbon monoxide (co)
b. carbon dioxide (co₂)
c. hydrocarbons (hc)
d. oxides of nitrogen (noₓ)

7. the process of combustion occurring without an open flame is called
________.
a. direct ignition
b. non - open flame combustion
c. spontaneous combustion
d. cold fusion

8. when using a fire extinguisher, what word can be used to rem
to do?
a. pass
b. fire
c. red
d. lever

9. which type of fire extinguisher is usable for most types of fir
a. co₂
b. dry chemical
c. water
d. co

10. which item is usually not included in a first - aid kit?
a. eye wash solution
b. antibiotic cream
c. fire blanket
d. bandages

Question

4. hearing protection should be worn anytime the noise level exceeds
   a. 60 db
   b. 70 db
   c. 80 db
   d. 90 db

5. two technicians are discussing the safe use of a wrench. technician a says
   that a wrench should be pulled toward you. technician b says that a
   wrench should be pushed away from you. which technician is correct?
   a. technician a only
   b. technician b only
   c. both technicians a and b
   d. neither technician a nor b

6. exhaust hoses should be used because one of the exhaust gases is deadly in
   high concentration. this gas is ________.
   a. carbon monoxide (co)
   b. carbon dioxide (co₂)
   c. hydrocarbons (hc)
   d. oxides of nitrogen (noₓ)

7. the process of combustion occurring without an open flame is called
   ________.
   a. direct ignition
   b. non - open flame combustion
   c. spontaneous combustion
   d. cold fusion

8. when using a fire extinguisher, what word can be used to rem
   to do?
   a. pass
   b. fire
   c. red
   d. lever

9. which type of fire extinguisher is usable for most types of fir
   a. co₂
   b. dry chemical
   c. water
   d. co

10. which item is usually not included in a first - aid kit?
    a. eye wash solution
    b. antibiotic cream
    c. fire blanket
    d. bandages

Accepted Answer

### Question 4
# Brief Explanations:
Hearing protection is recommended when noise levels exceed 85 - 90 dB (commonly 90 dB as a standard threshold for requiring hearing protection in many workplaces). Among the options, 90 dB (option d) is the correct threshold for when hearing protection should be worn.
# Answer:
d. 90 dB

### Question 5
# Brief Explanations:
When using a wrench, pulling it toward you (Technician A's advice) is safer as pushing it away can lead to loss of control if it slips, and pulling provides better leverage and safety. Pushing a wrench away (Technician B's advice) is less safe. So only Technician A is correct.
# Answer:
a. Technician A only

### Question 6
# Brief Explanations:
Exhaust gases from engines (like in vehicles) contain carbon monoxide (CO), which is deadly in high concentrations. Carbon dioxide ($CO_2$) is not as deadly in exhaust - related high concentrations in the same way, hydrocarbons (HC) and oxides of nitrogen ($NO_x$) have different toxicological profiles and CO is the main deadly exhaust gas in high concentration here.
# Answer:
a. Carbon monoxide (CO)

### Question 7
# Brief Explanations:
Spontaneous combustion is the process where combustion occurs without an open flame, due to self - heating of a substance reaching its ignition temperature. Direct ignition implies an external ignition source (not no open flame), non - open flame combustion is not a standard term, and cold fusion is a different concept (nuclear, not combustion - related).
# Answer:
c. Spontaneous combustion

### Question 8
# Brief Explanations:
The mnemonic for using a fire extinguisher is "PASS" which stands for Pull, Aim, Squeeze, Sweep. The other options (FIRE, RED, LEVER) are not the correct mnemonic.
# Answer:
a. PASS

### Question 9
# Brief Explanations:
Dry chemical fire extinguishers are usable for most types of fires (Class A, B, C fires). $CO_2$ is good for Class B and C but not as versatile for all, water is for Class A only, and CO is not a fire extinguisher type (it's a gas, and also toxic).
# Answer:
b. Dry chemical

### Question 10
# Brief Explanations:
A fire blanket is usually not included in a standard first - aid kit. Eye wash solution, antibiotic cream, and bandages are common components of a first - aid kit. Fire blankets are more related to fire safety equipment rather than first - aid for injuries.
# Answer:
c. Fire blanket

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