IDAT - International Diagnostic and Admission Global Knowledge and Science Questions and Answers 1 — Questions and Answers
Question 1: A hydroelectric power plant generates electricity by utilizing water stored at a high elevation behind a dam. Which of the following best describes the primary energy transformation that occurs to generate this electricity?
- Chemical energy to electrical energy
- Nuclear energy to mechanical energy
- Potential energy to electrical energy (Correct answer)
- Solar energy to kinetic energy
Correct answer: Potential energy to electrical energy
The water held at a height in the dam possesses gravitational potential energy. As it flows downwards through turbines, this potential energy is converted into kinetic (mechanical) energy, which spins the turbines. A generator then converts this mechanical energy into electrical energy. Therefore, the main transformation is from the water's initial potential energy to the final electrical energy.
Question 2: The relationship between clownfish and sea anemones is a well-known example of symbiosis. The clownfish receives protection from predators within the anemone's stinging tentacles (to which it is immune), while the anemone benefits from the clownfish cleaning it and scaring away its predators. What is this specific type of symbiotic relationship called?
- Mutualism (Correct answer)
- Parasitism
- Commensalism
- Predation
Correct answer: Mutualism
This relationship is called mutualism, a type of symbiosis where both species involved derive a benefit. The clownfish gets protection, and the anemone gets cleaned, defended, and may receive nutrients.
Question 3: When solid carbon dioxide, commonly known as 'dry ice,' is left at room temperature, it turns directly into a gas, completely bypassing the liquid phase. What is the scientific term for this physical process?
- Evaporation
- Condensation
- Deposition
- Sublimation (Correct answer)
Correct answer: Sublimation
Sublimation is the phase transition of a substance directly from a solid to a gas state, without passing through the intermediate liquid phase. Dry ice is a classic example of a substance that sublimes at standard atmospheric pressure.
Question 4: The 'Ring of Fire' is a major area in the basin of the Pacific Ocean renowned for its frequent earthquakes and volcanic eruptions. What is the primary geological cause of this intense activity?
- Erosion of continental shelves by strong ocean currents
- The convergence, divergence, and collision of major tectonic plates (Correct answer)
- The unusual depth of the Pacific Ocean basin
- The weakening of the Earth's crust by meteorite impacts
Correct answer: The convergence, divergence, and collision of major tectonic plates
The Ring of Fire is a direct result of plate tectonics. Its intense seismic and volcanic activity is caused by the movement and collisions of lithospheric plates, particularly where oceanic plates are subducted under continental plates.
Question 5: Which scientist is credited with the discovery of penicillin in 1928, which was the world's first broadly effective antibiotic and fundamentally changed the treatment of bacterial infections?
- Marie Curie
- Louis Pasteur
- Gregor Mendel
- Alexander Fleming (Correct answer)
Correct answer: Alexander Fleming
Sir Alexander Fleming, a Scottish physician and microbiologist, discovered the antibiotic substance penicillin in 1928. His accidental discovery at St. Mary's Hospital in London ushered in the age of antibiotics.
Question 6: Photosynthesis is the process used by plants and other organisms to convert light energy into chemical energy. Which of the following are the essential reactants (inputs) for this process?
- Oxygen and glucose
- Carbon dioxide and water (Correct answer)
- Nitrogen and soil
- Glucose and water
Correct answer: Carbon dioxide and water
The primary reactants for photosynthesis are carbon dioxide, which is typically taken from the air, and water, usually absorbed through the roots. Using light energy, these are converted into the products: glucose (sugar) and oxygen.
IDAT - International Diagnostic and Admission Global Knowledge and Science Questions and Answers 1
A hydroelectric power plant generates electricity by utilizing water stored at a high elevation behind a dam.
Which of the following best describes the primary energy transformation that occurs to generate this electricity?