Posted On : 29-Jan-2018

Q1: A primary fuel is that which is used in the same form as it occurs in nature. Which of the following is not a primary fuel?

• A. Kerosene
• B. Wood
• C. Natural Gas
• D. Coal

Q2: After the first photons of light are produced, which process is responsible for amplification of the light?

• A. Einstein oscillation
• B. Planck?s radiation
• C. Blackbody radiation
• D. Stimulated emission

Q3: Which of these has the highest calorific value?

• A. Rubber
• B. Hydrogen
• C. Wood
• D. Coal

Q4: Breaking of a larger hydrocarbon molecule into a smaller one by heating in the presence of a catalyst is called ___.

• A. Thermogenation
• B. Cracking
• C. Centrifugation
• D. Orthofugation

Q5: What is the main constituent of coal gas?

• A. Water
• B. Nitrogen
• C. Oxygen
• D. Methane

Q6: What is the process responsible for producing photons in a diode laser?

• A. Electron-hole recombination
• B. Fermi level shift
• C. Majority carrier injection
• D. Carrier freeze out

Q7: Some lasers are referred to as being cw. What does cw mean?

• A. Clear white
• B. Constant white
• C. Circular wave
• D. Continuous wave

Q8: Heating fuels in the absence of air is called 'Destructive Distillation', as it 'destroys' it to form simpler substances. What do we get when we do the same to wood?

• A. Tar
• B. All of these
• C. Acetic Acid
• D. Charcoal

Q9: "Antifreeze" is used in car radiators to stop the liquid that cools the engine from, well, freezing when it gets cold outside. Water is one component of antifreeze; what is the other main component?

• A. Acetone
• B. Ethylene glycol
• C. Benzene
• D. Sodium chloride

Q10: What was the active medium used in the first working laser ever constructed?

• A. Carbon dioxide gas
• B. A ruby rod
• C. Helium-neon gas
• D. A diamond block