False. A scalar quantity need not be conserved in a process. For example, temperature is a scalar but is not conserved—it can increase or decrease during heating or cooling. Similarly, speed is a scalar that changes during accelerated motion.

False. A scalar quantity can take negative values. For example, temperature can be negative (below 0°C). Work is another scalar that can be negative when the force and displacement are oppositely directed.

False. A scalar quantity need not be dimensionless. As stated in the context, a scalar is specified by a single number with the proper unit. Mass has dimensions [M], distance has dimensions [L], and time has dimensions [T].

False. A scalar quantity can vary from one point to another in space. For example, temperature varies from place to place and at different altitudes. Pressure is another scalar that varies with height.

True. A scalar quantity has the same value for observers with different orientations of axes. This is because a scalar is specified completely by a single number with proper unit and has no direction associated with it. For example, the mass of an object remains the same regardless of how the coordinate axes are oriented.