Chemistry - Mock Test 40

Question 391

Sodium carbonate crystal lose water molecules this property is called?

A) efflorescence B) hygroscopy C) deliquescence D) None of these

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Question 392

Which one of the following elements is essential for construction is nuclear reactors?

A) Cobalt B) Zirconium C) Nickel D) Tungsten

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Question 393

A radioactive substance has a half life of four months, three-fourth of the substance would decay in?

A) 3 months B) 8 months C) 4 months D) 12 months

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Question 394

Misch metal' is widely used in manufacture of which of the following?

A) Material of car brake B) Cigarette lighters C) Smoke detectors D) Emergency lights

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Question 395

The M.K.S. system was first introduced by?

A) archimedes B) Newton C) Eienstein D) Giorgi

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Question 396

Yellow cake' an item of smuggling across border is?

A) Uranium oxide B) Unrefined gold C) A crude form of heroin D) A crude form of cocaine

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Question 397

Among the given nutrients, milk is a poor source of?

A) Vitamin C B) Carbohydrates C) Protein D) Calcium

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Question 398

What is the structure of IF7?

A) Triagonal bipyramid B) Pentagonal bipyramid C) Square pyramid D) tetrahedral

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Question 399

Hydrogen bomb is based on the principle of?

A) natural radioactivity B) nuclear fusion C) nuclear fission D) artificial radioactivity

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Question 400

A mixture of sand and naphthalene can be separated by?

A) Fractional distillation B) Sublimation C) Chromatography D) Any of them

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