Materials and Construction

281. Phenol is not shipped in

1. Nickel lined steel tank cars
2. Galvanised or tin lined drums
3. Boxed glass carboys
4. Cast iron containers

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282. Photographic plates are coated with

1. Silver nitrate
2. Silver halide
3. Calcium silicate
4. Metallic silver

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283. Pick out the correct statement.

1. Stainless steel is nothing but chromium coated steel
2. Hardening of a soft metal can be done by alloying it with another metal or non-metal
3. Plastic deformation of a material is its temporary distortion under the action of applied stress
4. Rusting of iron is not electrochemical in nature

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284. Pick out the wrong statement

1. Hardening makes the steel more brittle
2. High alloy steels contain more than 50% alloying element
3. 18/8 stainless steel is a magnetic steel
4. Both (B) and (C)

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285. Pick out the wrong statement.

1. The toughness of a material decreases, when it is heated
2. Crane hooks are normally made of wrought iron
3. Cold working of a metal decreases its fatigue strength
4. The temperature at which new grains are formed in a metal is known as the recrystallisation temperature

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286. Pick the odd man out of the following.

1. Calorising
2. Pack carburising
3. Nitriding
4. Cyaniding

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287. Pipes for bi-cycle frames are made of _________ steel.

1. Hot rolled
2. Chrome carbon
3. Cold rolled
4. Stainless

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288. Plasticisers are added to polymers to improve their

1. Tensile strength
2. Softness & flexibility
3. Acid resistance
4. Alkali resistance

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289. Plastics are

1. Used in very high temperature applications
2. Non-biodegradable
3. Not suitable for drainage pipe manufacture
4. All (A), (B) & (C)

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290. Plate and frame filter press is usually made of

1. Mild steel
2. Cast iron
3. Stainless steel
4. Galvanised iron

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