Free Technology and Energy MCQs with Answers

41. Steam Turbine was introduce by ________ ?

• A. C.A. Parson
• B. Orwill Right
• C. Arkwright
• D. Alexander son

Explanation: Sir Charles Parsons developed the practical steam turbine in 1884, greatly improving the conversion of steam energy into rotary motion. The other names are associated with different inventions or fields.

42. BRT stand for ?

• A. Blue rapid Transport
• B. Best road transportation
• C. Bus Rapid Transit
• D. Best road Transit

Explanation: BRT stands for Bus Rapid Transit, a public-transport system using buses on dedicated or priority routes to provide faster service.

43. Golden rice has the highest quantity of______?

• A. Vitamin A
• B. Vitamin B
• C. Vitamin C
• D. Vitamin K

Explanation: Golden rice is genetically modified to produce beta-carotene in its grains. The body converts beta-carotene into vitamin A, helping prevent deficiency.

44. Which of the following is not a donor atom?

• A. Phosphorus
• B. Antimony
• C. Arsenic
• D. Aluminum

Explanation: Phosphorus, arsenic and antimony are group 15 elements that supply extra electrons when added to silicon, so they act as donor impurities. Aluminium is a group 13 acceptor impurity instead.

45. Heavy mechanical complex use a large amount of water for_________?

• A. Cooling
• B. Freezing
• C. Washing
• D. Mixing

Explanation: Heavy mechanical equipment produces substantial heat through friction and operation, so water is commonly circulated to remove heat and prevent overheating. Freezing, washing and mixing are not the main purpose in this context.

46. What charge card, developed in 1950, was the first to be accepted nationally in the US?

• A. Visa
• B. Discover
• C. MasterCharge
• D. Diner's Club

Explanation: Diners Club introduced the first widely accepted charge card in 1950, initially for use at restaurants and later across the United States. Visa and MasterCard came later, while Discover was introduced much later.

47. When were blue jeans invented in _________?

• A. 1900s
• B. 1860s
• C. 1870s
• D. 1850s

Explanation: Modern blue jeans were developed by Levi Strauss and Jacob Davis and patented in 1873. That places their invention in the 1870s, although denim garments existed before this patent.

48. The term "white coal" sometimes referred to which of the following?

• A. Geothermal Electricity
• B. Wind Energy
• C. Hydroelectricity
• D. Biomass Energy

Explanation: Hydroelectricity is called white coal because flowing or falling water produces clean electrical energy, analogous to coal as a power source. The term is not normally used for geothermal, wind or biomass energy.

49. Which type of reaction produces the most harmful radiation?

• A. Fusion reaction
• B. Fission reaction
• C. Chemical reaction
• D. Photo-Chemical reaction

Explanation: Nuclear fission produces radioactive fragments and long-lived radioactive waste, making its radiation hazard greater than that of ordinary chemical or photochemical reactions. Fusion can also produce radiation, but it does not create the same large quantity of long-lived fission products.

50. The electronic device which is used as a switch or amplifier is called ?

• A. Diode
• B. Resistor
• C. Transistor
• D. Transformer

Explanation: A transistor controls current and can operate as an electronic switch or amplify a signal. A diode mainly permits current in one direction, while a resistor limits current.