GED Science Physical Science 4 ā Questions and Answers
Question 1: An element has an atomic number of 6 and a mass number of 12. How many neutrons are in the nucleus?
- 12
- 6 (Correct answer)
- 18
- 3
Correct answer: 6
Neutrons = mass number ā atomic number = 12 ā 6 = 6.
Question 2: A 10 N force is applied to a 2 kg object. What is the object's acceleration?
- 20 m/sĀ²
- 5 m/sĀ² (Correct answer)
- 12 m/sĀ²
- 0.2 m/sĀ²
Correct answer: 5 m/sĀ²
Using Newton's second law, F = ma, so a = F/m = 10/2 = 5 m/sĀ².
Question 3: Which of the following electromagnetic waves has the highest frequency?
- Radio waves
- Visible light
- X-rays (Correct answer)
- Microwaves
Correct answer: X-rays
X-rays have a much higher frequency (and shorter wavelength) than radio waves, microwaves, or visible light.
Question 4: In a series circuit with a 12 V battery and two 3-ohm resistors, what is the total current?
- 4 A
- 2 A (Correct answer)
- 1 A
- 6 A
Correct answer: 2 A
Total resistance = 3 + 3 = 6 ohms; I = V/R = 12/6 = 2 A by Ohm's Law.
Question 5: Which statement correctly describes the relationship between mass and weight?
- Mass and weight are the same everywhere in the universe
- Weight is a measure of the amount of matter; mass is the force of gravity
- Mass stays constant, but weight changes depending on gravitational pull (Correct answer)
- Weight stays constant, but mass changes depending on location
Correct answer: Mass stays constant, but weight changes depending on gravitational pull
Mass is the amount of matter in an object and never changes; weight is the gravitational force on that mass and varies by location.
Question 6: During which type of nuclear reaction are large atomic nuclei split into smaller ones?
- Fusion
- Combustion
- Fission (Correct answer)
- Radioactive decay
Correct answer: Fission
Nuclear fission involves splitting a heavy nucleus into smaller fragments, releasing large amounts of energy.
Question 7: A wave has a frequency of 5 Hz and a wavelength of 2 meters. What is the wave's speed?
- 2.5 m/s
- 7 m/s
- 10 m/s (Correct answer)
- 0.4 m/s
Correct answer: 10 m/s
Wave speed = frequency Ć wavelength = 5 Hz Ć 2 m = 10 m/s.
GED Science Physical Science 4
An element has an atomic number of 6 and a mass number of 12.
How many neutrons are in the nucleus?