The earliest historic evidences of use of metal are of Chalcolithic Age or Stone-Copper Age, which covered the period from 1800 - 800 BC. This period was by the use of Copper as well as stone.
Hence, the first metal to be used in India is Copper.
Which of the following definitions describes a physical hazard?
A) The most commonly thought of hazard in construction. This hazard includes radiation, extreme temperatures, noise, and vibration.
B) These hazards can lead to injuries to the joints or muscles by way of heavy, frequent lifting, repetitive tasks.
C) Can be present in dust, fumes, liquids, solids, mists, vapors, or gases of products used at a site or released during a construction job
D) Microorganisms, such as bacteria, fungus, mold, or viruses that can cause illness.
A) The most commonly thought of hazard in construction. This hazard includes radiation, extreme temperatures, noise, and vibration.
B) These hazards can lead to injuries to the joints or muscles by way of heavy, frequent lifting, repetitive tasks.
C) Can be present in dust, fumes, liquids, solids, mists, vapors, or gases of products used at a site or released during a construction job
D) Microorganisms, such as bacteria, fungus, mold, or viruses that can cause illness.
Answer & ExplanationAnswer: A) The most commonly thought of hazard in construction. This hazard includes radiation, extreme temperatures, noise, and vibration.
Explanation:
A physical hazard is defined as "A factor within the environment that can harm the body without necessarily touching it."
Vibration and noise are examples of physical hazards.
Physical hazards include but aren't limited to electricity, radiation, pressure, noise, heights and vibration amongst many others.
There are 5 multiple choice questions in an examination. How many sequences of answers are possible, if the first three questions have 4 choices each and the next two have 6 choices each?
A) coagulation of particles and the dispersed phase
B) erratic flashes of light
C) molecules of the dispersion medium colliding with dispersed phase particles
D) All the above
A) coagulation of particles and the dispersed phase
B) erratic flashes of light
C) molecules of the dispersion medium colliding with dispersed phase particles
D) All the above
Answer & ExplanationAnswer: C) molecules of the dispersion medium colliding with dispersed phase particles
Explanation:
When their is a colloid in the solution, then it will show the Brownian movement, such as dust particle in the air will show the Brownian movement.
Hence, Brownian movement arises due to the impact of the molecules of the dispersion medium with the colloidal particles. It has been postulated that the impact of the molecules of dispersion medium on the colloidal particles are unequal.
This leads to the zig-zag (random) motion of the colloidal particles.
Madhya Pradesh state has the maximum number of wildlife sanctuaries in India. It has total of 36 wildlife sanctuaries. In India, there are total 96 national parks and 510 wildlife sanctuaries.
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