Q1: For mountaneous regions having steep slope, wagons for carrying liquid are made with bottom

ANS:B - parallel to the horizontal surface

The phrase "parallel to the horizontal surface" could be interpreted in different ways, but in the context of wagons carrying liquid in mountainous regions with steep slopes, it might not be the most accurate description. When considering a wagon's bottom being parallel to the horizontal surface, it implies that the bottom of the wagon is aligned with the horizon regardless of the slope of the road. This alignment could lead to instability and potential spillage of the liquid cargo, especially when traversing steep inclines or declines. To ensure stability and prevent spillage, wagons carrying liquid are typically designed with bottoms parallel to the road surface. In other words, the bottom of the wagon is aligned with the slope of the road, allowing the liquid cargo to remain level and stable within the wagon. Therefore, "parallel to the horizontal surface" may not be the best description for the optimal design of wagons carrying liquid in mountainous regions with steep slopes. Instead, the bottom of the wagon should be parallel to the road surface to ensure stability and safety during transportation.