Texas CDL General Knowledge Practice Exam

Which of these would probably not help if your windshield were covered in ice?

1. Defroster

2. Antifreeze

3. Brush

4. Windshield wipers

The correct answer is: Brush

Using a brush is likely the least effective option for dealing with a windshield covered in ice. While a brush can help clear away snow or loose ice, it may not be sufficient for removing stubborn, frozen layers that adhere tightly to the glass. In contrast, the defroster is specifically designed to warm the glass and melt the ice, making it a viable solution. Antifreeze is relevant for maintaining the vehicle's engine temperature and preventing freeze, but its primary use is unrelated to clearing ice from the windshield itself. Windshield wipers are meant for rain and can help remove slush or water, but they aren't effective against ice unless it's already been softened or loosened. Therefore, a brush's limitations in effectively dealing with ice on a windshield make it the least helpful choice among the options given.