Free Technology and Energy MCQs with Answers

11. A moderator is used in nuclear reactor in order to ?

• A. Accelerate the neutrons
• B. Slow down the speed of the neutrons
• C. Increase the number of elections
• D. Decrease the number of electrons
• E. None of these

Explanation: A moderator reduces the speed of fast neutrons, commonly using materials such as water or graphite. Slow neutrons are more effective at sustaining fission in many nuclear reactors.

12. Fuel used in a Fast Breeder Reactor is _____________?

• A. Uranium Oxide
• B. Uranium Plutonium carbide
• C. Uranium Plutonium Oxide
• D. Uranium thorium Oxide
• E. None of these

Explanation: Fast breeder reactors commonly use mixed uranium-plutonium oxide fuel, called MOX fuel. The reactor also converts fertile uranium-238 into additional plutonium fuel.

13. Basic metals can be converted into gold by ?

• A. Heating
• B. Beating
• C. Artificial nuclear radioactivity
• D. Chemical reaction

Explanation: Changing one element into another requires nuclear transmutation, which changes the atomic nucleus and hence the atomic number. Heating and chemical reactions only alter physical state or chemical combinations, not one element into gold.

14. Radioactive isotope of Uranium used in Nuclear Bomb is ?

• A. 92 U 235
• B. 92 U 234
• C. 92 U 233
• D. 92 U 238

Explanation: Uranium-235 is fissile, meaning it can sustain a rapid chain reaction with slow neutrons and is therefore used in nuclear weapons. Uranium-238 is abundant but not readily fissioned by slow neutrons.

15. The device used to convert Alternate Current into Direct Current is called?

• A. Anemometer
• B. Battery
• C. Galvanometer
• D. Rectifier

Explanation: A rectifier uses diodes to allow current mainly in one direction, converting alternating current into direct current. An anemometer measures wind speed and a galvanometer detects small currents.

16. Wind energy is the __________ energy.

• A. Potential
• B. Transverse
• C. Kinetic
• D. Mechanical

Explanation: Moving air possesses kinetic energy because its energy depends on motion. Wind turbines convert this kinetic energy into mechanical rotation and then usually into electrical energy.

17. GPS is an abbreviation for?

• A. Global Poles System
• B. Global PolySiliconium Store
• C. Global Positioning System
• D. Global Position Structure

Explanation: GPS stands for Global Positioning System. Satellites transmit timed signals that allow a receiver to calculate its position on Earth.

18. CNG stands for?

• A. Converted Natural Gas
• B. Conduced Natural Gas
• C. Conducted Natural Gas
• D. Compressed Natural Gas

Explanation: CNG means compressed natural gas, in which natural gas is stored at high pressure for use as a fuel. The compression makes storage in vehicle cylinders practical.

19. Which from the following is NOT a conductor?

• A. Aluminium
• B. Gold
• C. Graphite
• D. All are conductors

Explanation: Aluminium, gold and graphite can all conduct electricity, although graphite is a non-metal conductor. Therefore, none of the first three is the requested non-conductor, making “all are conductors” correct.

20. A device which converts chemical energy into electrical energy is called __________?

• A. motor
• B. generator
• C. moving-coil meter
• D. battery

Explanation: A battery converts chemical energy into electrical energy through chemical reactions at its electrodes. A generator converts mechanical energy into electrical energy, while a motor does the reverse conversion.