Safety Interview Questions 26 contains questions about safety measures at roof work,  hazards on construction site,  power tools,  occupational diseases in construction industry,  PEL for 8 hrs of noise.

251. List any 2 safety measures at roof work?

252. What is the unit of light?

253. Write any three environmental hazards on construction site?

254. What is the Min & Max percentage of O2 allowed to work in confined space?

255. W

251. List any 2 safety measures at roof work?

I. Isolate overhead electric lines.

II. Use of safety nets and fall arrest systems.

252. What is the unit of light?

There are many different units for measuring light and it can get very complicated. Here are a few common measurement terms:

I. Candela(cd)

Unit of luminous intensity of a light source in a specific direction. Also called candle.

Technically, the radiation intensity in a perpendicular direction of a surface of 1/600000 square meter of a black body at the temperature of solidification platinum under a pressure of 101,325 newton’s per square meter.

II. Foot-candle(fcorftc)

Unit of light intensity, measured in lumens per square foot. The brightness of one candle at a distance of one foot. Approximately 10.7639 lux.

III. Lumen(lm)

Unit of light flow or luminous flux. The output of artificial lights can be measured in lumens.

IV. Lux(lx)

 Unit of illumination equal to one lumen per square meter. The metric equivalent of foot-candles (one lux equals 0.0929 foot-candles). Also called meter-candle.

253. Write any three environmental hazards on construction site?

I. Air pollution

II. Water pollution

III. Noise Pollution

IV. Asbestos dust becoming airborne

254. Write any 4 hazards in hot work activity?

I. Fire

II. Explosion

III. Electrocution

IV. Burns

V. Arc-flash

VI. Oxygen-depletion

VII. Toxic fumes

254. Write any three heat-stress related disorders?

I. Heat stroke - 

Defined by a body temperature of greater than 40 °C (104 °F) due to environmental heat exposure with lack of thermoregulation. Symptoms include dry skin, rapid, strong pulse and dizziness.

II. Heat exhaustion - 

Can be a precursor of heatstroke; the symptoms include heavy sweating, rapid breathing and a fast, weak pulse.

III. Heat syncope - 

Fainting as a result of overheating.

IV. Heat edema

V. Heat cramps - 

Muscle pains that happen during heavy exercise in hot weather.

VI. Heat rash - 

Skin irritation from excessive sweating.

 VII. Heat tetany - 

Usually results from short periods of stress in intense heat. Symptoms may include hyperventilation, respiratory problems, numbness or tingling, or muscle spasms.

255. What i


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