All Free Chemical Engineering MCQs with Answers

• A. Kudremukh
• B. Kolar
• C. Ramagundam
• D. Khetri

Explanation: Khetri in Rajasthan is one of India's well-known copper-producing areas.

• A. Bauxite
• B. Chalcocite
• C. Galena
• D. None of these

Explanation: Bauxite is the principal ore of aluminium and is processed to alumina before electrolytic reduction.

• A. Critical
• B. Breeder
• C. Fertile
• D. Heterogeneous

Explanation: A breeder reactor produces more fissile material than it consumes by converting fertile isotopes into fissile fuel.

• A. Increase fluidity of solder by lowering its melting temperature
• B. Full up the joint gap
• C. Wash away surplus solder
• D. Prevent oxide formation

Explanation: Flux removes existing oxide films and prevents further oxidation of the metal surfaces during soldering, allowing the solder to wet and…

• A. Liquid dispersed in gas
• B. Solid dispersed in liquid
• C. Solid dispersed in gas
• D. Gas dispersed in liquid

Explanation: Fog consists of fine liquid water droplets dispersed in air, so it is a liquid-in-gas aerosol.

• A. Forging
• B. Investment casting
• C. Shell moulding
• D. Pressure die casting

Explanation: Investment casting can produce intricate turbine blades with accurate dimensions and internal cooling passages, often using…

• A. Hot rolled mild
• B. Forged
• C. Cold rolled mild
• D. Machinable stainless

Explanation: Keys are commonly made from cold-rolled mild steel because it provides adequate strength and a sound, uniform bar for resisting shear and…

• A. Easily weldable characteristics
• B. Ability to hold protective coating
• C. High ductility & corrosion resistance
• D. Uniform strength in all directions

Explanation: Wrought iron contains elongated slag inclusions from working, giving it directional or non-uniform mechanical properties.

• A. Electrical
• B. Thermal
• C. Mechanical
• D. Chemical

Explanation: A solar cell uses the photovoltaic effect to convert light directly into electrical energy.

• A. Low pressure & load
• B. High pressure & load
• C. High temperature
• D. Large surface wear

Explanation: Tin-based white metals, such as tin babbitt alloys, provide good bearing performance under high pressure and heavy load while resisting…

• A. No preferred shape
• B. Nodular
• C. Irregular
• D. Spherical

Explanation: Spherical powder particles are preferred because they flow readily and produce a controlled, interconnected pore structure after…

• A. Alumina
• B. Zirconia
• C. Beryllium
• D. Magnesia

Explanation: Alumina is extremely hard, with a Mohs hardness close to 9, and retains strong wear resistance at elevated temperature.

• A. X-rays
• B. γ-rays
• C. α-rays
• D. β-rays

Explanation: Cobalt-60 undergoes beta decay and produces intense gamma radiation, which can penetrate tissue and industrial components.

• A. Velocity
• B. Both A. & B.
• C. Acceleration
• D. Neither A. nor B.

Explanation: In simple harmonic motion, acceleration is proportional to displacement and opposite in direction: a = −ω²x.

• A. pH value
• B. Turbidity
• C. Electrical conductivity
• D. Dissolved oxygen content

Explanation: Electrical conductivity reflects the concentration of dissolved ionic substances, so it provides a useful overall indication of water…

• A. 20
• B. 200
• C. 500
• D. 2000

Explanation: A uranium-235 fission event releases about 200 MeV, mainly as kinetic energy of the fission fragments and some neutron and gamma energy.

• A. 0°R
• B. 50°K
• C. 0°C
• D. None of these

Explanation: Absolute zero is 0 K, which is also 0°R on the absolute Rankine scale. It is not 0°C, since 0°C equals 273.15 K.

• A. Ultraviolet rays
• B. Infrared rays
• C. Cosmic rays
• D. X-rays

Explanation: Cosmic rays have extremely high energies and correspondingly very short wavelengths, shorter than ultraviolet, infrared, and X-rays.

• A. Chromium
• B. Nickel
• C. Manganese
• D. Molybdenum

Explanation: Manganese, nickel, and chromium are commonly used alloying elements in structural steels, whereas molybdenum is a more specialised…

• A. Covalent
• B. Ionic
• C. Metallic
• D. Vander Waal's

Explanation: Covalent bonds have fixed directional orientations because atoms share electron pairs along specific orbital directions.