Free Technology and Energy MCQs with Answers

91. Heating element of an electric heater is made up of___________?

• A. Tungsten
• B. Graphite
• C. Chromium
• D. Nichrome

Explanation: Electric heaters use nichrome, an alloy with high electrical resistance and a high melting point. Its resistance converts electrical energy into heat without melting quickly.

92. Telephone was invented by__________?

• A. Vint Cerf
• B. Charles Babbage
• C. Edison
• D. Alexander Graham Bell

Explanation: Alexander Graham Bell is credited with inventing and patenting the practical telephone in 1876. Edison made major contributions to electrical technology but was not the telephone's inventor.

93. UPS is now widely use in households. What does UPS stands for ?

• A. Uniform Power Storage
• B. Universal Product Support
• C. Under Panel Storage
• D. Uninterruptible Power Supply

Explanation: UPS means Uninterruptible Power Supply, a device that provides temporary backup electricity when the main supply fails. It also helps protect equipment from some voltage disturbances.

94. Which element is used as moderator in nuclear reactor?

• A. Light water
• B. Dense water
• C. Fresh water
• D. Heavy water

Explanation: Heavy water is used as a moderator in some nuclear reactors because its deuterium slows fast neutrons while absorbing relatively few of them. Light water can also moderate certain reactors, so the question is simplified but d is the intended choice.

95. Battery was invented by__________?

• A. Nicolas Léonard Sadi Carnot
• B. Alessandro Volta
• C. Michael Faraday
• D. Friedrich Bessel

Explanation: Alessandro Volta made the first practical chemical battery, the voltaic pile, in 1800. Faraday later established important laws of electromagnetic induction, but he did not invent the battery.

96. who invented bulb?

• A. Philips
• B. Robert
• C. Edison
• D. Willium

Explanation: Thomas Edison is commonly credited in general-knowledge questions with inventing the practical incandescent electric bulb. Earlier inventors produced experimental bulbs, but Edison developed a durable, commercially useful version.

97. "Elephant" large unit of paper measurement equal to 28 by__________

• A. 23 inches
• B. 25 inches
• C. 28 inches
• D. 31 inches

Explanation: Elephant paper is a large traditional paper size measuring 28 by 23 inches. The name refers to the sheet size, not to a physical property of paper.

98. Fuzzy logic is a part of_________________?

• A. Aristotle's philosophy
• B. Computer science
• C. Epicurianism
• D. Sophism

Explanation: Fuzzy logic is a computing method that handles degrees of truth rather than only true-or-false values, making it useful in control systems and artificial intelligence. The philosophical options are unrelated schools of thought.

99. An extremely small piece of silicon on which integrated circuits are implicated is called __________________?

• A. Card Reader
• B. Hollerith Code
• C. Feed
• D. Chip

Explanation: A chip is a small piece of semiconductor material, usually silicon, containing an integrated circuit. Card readers and Hollerith codes are data-processing devices or methods, not the silicon component itself.

100. Intrinsic Semi-conductor is also known as__________?

• A. Impure-Conductor
• B. Pure-Conductor
• C. Simple Conductor
• D. None of these

Explanation: An intrinsic semiconductor is made from a chemically pure semiconductor material, without intentional impurity doping. Hence it is commonly called a pure semiconductor, not a simple conductor.