Free Chemical Process Principles MCQs with Answers

• A. Lead
• B. Cloth
• C. Paper
• D. Aluminium

Explanation: Lead has a high density and strongly absorbs X-rays, which is why it is used for radiation shielding.

• A. Acidity
• B. Basicity
• C. Fluidity
• D. Viscosity

Explanation: A neutral flux reacts with acidic or basic impurities and helps form a less viscous molten slag.

• A. Specific gravities
• B. Densities
• C. Gas characteristic constants
• D. Molecular weights

Explanation: At the same temperature and pressure, equal gas volumes contain equal numbers of molecules, so their masses, and hence densities, are…

• A. He
• B. H2
• C. Ar
• D. O2

Explanation: Helium has a molecular mass of about 4 and is chemically inert, so it is the lightest non-flammable gas listed.

• A. Molybdenum
• B. Silicon
• C. Vanadium
• D. Chromium

Explanation: Nickel improves steel toughness, while silicon is commonly included to improve strength and elastic properties and can contribute to…

• A. Aluminium carbide
• B. Nickel carbide
• C. Tungsten carbide
• D. Iron carbide

Explanation: Tungsten carbide is extremely hard and wear resistant, which makes it suitable for cutting-tool inserts and other high-wear applications.

• A. Are exemplified by Na, K and Li
• B. Do not resist corrosion very strongly
• C. None of these
• D. Are the lowermost in the electro-chemical series of metals

Explanation: Noble metals such as gold, platinum, and silver are very resistant to oxidation and corrosion and are placed toward the less-active, lower…

• A. Free electrons
• B. Holes
• C. Conduction electrons
• D. Ions

Explanation: P-type silicon is formed by adding trivalent impurities, creating vacancies called holes in the covalent bonds.

• A. Adhesive
• B. Molecular
• C. Cohesive
• D. Vander Walls

Explanation: Cohesive force is the attraction between molecules of the same substance, such as water molecules attracting one another.

• A. 1 : 4
• B. 1 : 2
• C. 2 : 1
• D. 1 : 1

Explanation: Strain equals stress divided by Young's modulus, and both wires have the same cross-sectional area, material and applied force.

• A. Creep
• B. Endurance
• C. Fatigue
• D. None of these

Explanation: Creep strength is the maximum stress a material can sustain for a specified time at a specified temperature without excessive permanent…

• A. Calcium
• B. Nitrogen
• C. Phosphorous
• D. Hydrogen

Explanation: Nitrogen is present in chlorophyll's porphyrin ring and is essential for chlorophyll formation and photosynthesis.

• A. Mercury
• B. Calcium
• C. Sodium
• D. Magnesium

Explanation: Sodium reacts violently with water, producing sodium hydroxide and hydrogen while releasing enough heat to ignite the hydrogen.

• A. Bleaching powder
• B. None of these
• C. Aluminium sulphate
• D. Lime powder

Explanation: Lime powder reduces latrine odour by neutralising acidic, foul-smelling compounds and helping control decomposition.

• A. Reduced chance of gas porosity
• B. Greater dimensional stability of the casting
• C. Uniform flow of molten metal into the mould cavity
• D. Less sand expansion type of casting defect

Explanation: Uniform ramming produces consistent mould hardness and packing, giving the casting more uniform support and better dimensional stability.

• A. Basic
• B. Acid
• C. No
• D. Neutral

Explanation: A self-fluxing ore already contains gangue constituents capable of forming a fusible slag, so adding an external flux is unnecessary.

• A. Time
• B. Square of time
• C. Square root of time
• D. Cube of time

Explanation: Decarburisation is controlled by diffusion of carbon, and diffusion distances grow according to the parabolic law, proportional to the…

• A. Capillary action
• B. Surface tension
• C. Cohesion
• D. Adhesion

Explanation: Adhesion is the attraction between unlike substances, here between talc particles and the skin.

• A. Cobalt, chromium & tungsten
• B. Cobalt, chromium & nickel
• C. Molybdenum, tungsten & chromium
• D. Cobalt, zirconium & molybdenum

Explanation: Stellite-type cast tool alloys are based mainly on cobalt with chromium and tungsten.

• A. Spark plug
• B. Compression ignition system
• C. Carburettor
• D. Otto cycle

Explanation: A petrol engine normally uses spark ignition, commonly with a spark plug and the Otto cycle.