GED Science Physical Science 4

Question 1

An element has an atomic number of 6 and a mass number of 12. How many neutrons are in the nucleus?

Accepted Answer

6

Answer

Neutrons = mass number − atomic number = 12 − 6 = 6.

Question 2

A 10 N force is applied to a 2 kg object. What is the object's acceleration?

Accepted Answer

5 m/s²

Answer

Using Newton's second law, F = ma, so a = F/m = 10/2 = 5 m/s².

Question 3

Which of the following electromagnetic waves has the highest frequency?

Accepted Answer

X-rays

Answer

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?

Accepted Answer

2 A

Answer

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?

Accepted Answer

Mass stays constant, but weight changes depending on gravitational pull

Answer

Mass is the amount of matter in an object and never changes; weight is the gravitational force on that mass and varies by location.

GED Practice Test