Achievement Test Standardized Achievement Science 4 — Questions and Answers
Question 1: Which part of the human digestive system absorbs most of the nutrients from food?
- Stomach
- Large intestine
- Small intestine (Correct answer)
- Esophagus
Correct answer: Small intestine
The small intestine is the primary site of nutrient absorption, aided by villi that increase surface area.
Question 2: What type of energy is stored in the chemical bonds of food?
- Kinetic energy
- Thermal energy
- Nuclear energy
- Chemical (potential) energy (Correct answer)
Correct answer: Chemical (potential) energy
Food contains chemical potential energy stored in molecular bonds, which cells release through cellular respiration.
Question 3: Two forces of 10 N and 6 N act in the same direction on an object. What is the net force?
- 4 N
- 16 N (Correct answer)
- 60 N
- 8 N
Correct answer: 16 N
When forces act in the same direction, they add together: 10 N + 6 N = 16 N.
Question 4: Which gas makes up the largest percentage of Earth's atmosphere?
- Oxygen
- Carbon dioxide
- Nitrogen (Correct answer)
- Argon
Correct answer: Nitrogen
Nitrogen (N₂) comprises approximately 78% of Earth's atmosphere, far more than oxygen at about 21%.
Question 5: A scientist repeats an experiment five times and gets similar results each time. This best demonstrates which scientific principle?
- Bias elimination
- Hypothesis formation
- Reproducibility (Correct answer)
- Observation
Correct answer: Reproducibility
Reproducibility means an experiment yields consistent results when repeated, strengthening confidence in the findings.
Question 6: Which process do plants use to make their own food using sunlight?
- Respiration
- Fermentation
- Photosynthesis (Correct answer)
- Decomposition
Correct answer: Photosynthesis
Photosynthesis converts light energy, water, and CO₂ into glucose and oxygen in chloroplasts.
Question 7: What is the term for a change in the DNA sequence of an organism?
- Mitosis
- Mutation (Correct answer)
- Meiosis
- Adaptation
Correct answer: Mutation
A mutation is an alteration in the nucleotide sequence of an organism's DNA, which may or may not affect traits.
Achievement Test Standardized Achievement Science 4
Which part of the human digestive system absorbs most of the nutrients from food?