G40 Oxygen and Flammable Gas Storage
Mock Examination Newest (2025 - 2026
Update) From Real Past Papers Questions –
A Set Of 100 Most Common Exam
Frequently Tested Questions And Answers
In Details 100% Verified Exam Highly
Recommendable Grade A+ (Verified
Answers) Plus Rationales | Instant
Download Pdf
1. What is the primary hazard when storing oxygen cylinders?
A. Oxygen is flammable
B. Oxygen increases combustion
C. Oxygen is explosive by itself
D. Oxygen produces carbon monoxide
Answer: B. Oxygen increases combustion
Explanation: Oxygen does not burn itself but greatly supports combustion,
causing other materials to ignite more easily and burn much faster.
2. Which gas is classified as a flammable gas?
A. Nitrogen
,B. Carbon dioxide
C. Acetylene
D. Argon
Answer: C. Acetylene
Explanation: Acetylene is a highly flammable gas widely used in welding and
cutting operations.
3. Oxygen cylinders should normally be stored:
A. Horizontally
B. Upside down
C. Vertically and secured
D. In water
Answer: C. Vertically and secured
Explanation: Cylinders should be stored upright and secured to prevent falling and
valve damage.
4. Why must oxygen cylinders be kept away from oils and grease?
A. They stain the cylinder
B. They reduce pressure
C. They may ignite violently
D. They cool the cylinder
Answer: C. They may ignite violently
Explanation: Oil and grease can react violently in oxygen-enriched environments,
creating a serious fire hazard.
5. What color identifies an oxygen cylinder in most industrial settings?
A. Yellow
,B. Black body with white shoulder
C. Green body only
D. Red
Answer: B. Black body with white shoulder
Explanation: Standard cylinder color identification helps workers recognize oxygen
cylinders quickly.
6. Flammable gas cylinders should be stored:
A. Beside oxidizing gases
B. Near ignition sources
C. In designated ventilated storage
D. Under direct sunlight
Answer: C. In designated ventilated storage
Explanation: Proper ventilation reduces the accumulation of flammable gas in
case of leakage.
7. What is the minimum action before moving a gas cylinder?
A. Remove the label
B. Open the valve
C. Fit the valve protection cap
D. Lay the cylinder down
Answer: C. Fit the valve protection cap
Explanation: The valve protection cap helps prevent damage that could turn a
cylinder into a dangerous projectile.
8. Which device is designed to reduce cylinder pressure?
A. Flashback arrestor
, B. Pressure regulator
C. Hose clamp
D. Manifold
Answer: B. Pressure regulator
Explanation: A pressure regulator safely reduces cylinder pressure to the required
working pressure.
9. Oxygen-enriched atmospheres:
A. Prevent fires
B. Reduce combustion
C. Increase fire intensity
D. Have no effect
Answer: C. Increase fire intensity
Explanation: Oxygen enrichment makes materials ignite more easily and causes
fires to burn more intensely.
10.Empty cylinders should be:
A. Treated as hazard-free
B. Stored with valves open
C. Stored separately and identified
D. Left outdoors unsecured
Answer: C. Stored separately and identified
Explanation: Even "empty" cylinders usually contain residual pressure and must
be managed safely.
11.Which gas is an oxidizer?
A. Oxygen
Mock Examination Newest (2025 - 2026
Update) From Real Past Papers Questions –
A Set Of 100 Most Common Exam
Frequently Tested Questions And Answers
In Details 100% Verified Exam Highly
Recommendable Grade A+ (Verified
Answers) Plus Rationales | Instant
Download Pdf
1. What is the primary hazard when storing oxygen cylinders?
A. Oxygen is flammable
B. Oxygen increases combustion
C. Oxygen is explosive by itself
D. Oxygen produces carbon monoxide
Answer: B. Oxygen increases combustion
Explanation: Oxygen does not burn itself but greatly supports combustion,
causing other materials to ignite more easily and burn much faster.
2. Which gas is classified as a flammable gas?
A. Nitrogen
,B. Carbon dioxide
C. Acetylene
D. Argon
Answer: C. Acetylene
Explanation: Acetylene is a highly flammable gas widely used in welding and
cutting operations.
3. Oxygen cylinders should normally be stored:
A. Horizontally
B. Upside down
C. Vertically and secured
D. In water
Answer: C. Vertically and secured
Explanation: Cylinders should be stored upright and secured to prevent falling and
valve damage.
4. Why must oxygen cylinders be kept away from oils and grease?
A. They stain the cylinder
B. They reduce pressure
C. They may ignite violently
D. They cool the cylinder
Answer: C. They may ignite violently
Explanation: Oil and grease can react violently in oxygen-enriched environments,
creating a serious fire hazard.
5. What color identifies an oxygen cylinder in most industrial settings?
A. Yellow
,B. Black body with white shoulder
C. Green body only
D. Red
Answer: B. Black body with white shoulder
Explanation: Standard cylinder color identification helps workers recognize oxygen
cylinders quickly.
6. Flammable gas cylinders should be stored:
A. Beside oxidizing gases
B. Near ignition sources
C. In designated ventilated storage
D. Under direct sunlight
Answer: C. In designated ventilated storage
Explanation: Proper ventilation reduces the accumulation of flammable gas in
case of leakage.
7. What is the minimum action before moving a gas cylinder?
A. Remove the label
B. Open the valve
C. Fit the valve protection cap
D. Lay the cylinder down
Answer: C. Fit the valve protection cap
Explanation: The valve protection cap helps prevent damage that could turn a
cylinder into a dangerous projectile.
8. Which device is designed to reduce cylinder pressure?
A. Flashback arrestor
, B. Pressure regulator
C. Hose clamp
D. Manifold
Answer: B. Pressure regulator
Explanation: A pressure regulator safely reduces cylinder pressure to the required
working pressure.
9. Oxygen-enriched atmospheres:
A. Prevent fires
B. Reduce combustion
C. Increase fire intensity
D. Have no effect
Answer: C. Increase fire intensity
Explanation: Oxygen enrichment makes materials ignite more easily and causes
fires to burn more intensely.
10.Empty cylinders should be:
A. Treated as hazard-free
B. Stored with valves open
C. Stored separately and identified
D. Left outdoors unsecured
Answer: C. Stored separately and identified
Explanation: Even "empty" cylinders usually contain residual pressure and must
be managed safely.
11.Which gas is an oxidizer?
A. Oxygen
