CIE iGCSE Co-Ordinated Science P1.3 Mass and weight Exam Style Questions Paper 1
▶️ Answer/Explanation
Substituting the given values: \(m = \dfrac{2.0}{10}\).
This gives \(m = 0.20\ \text{kg}\).
✅ Answer: (B)
▶️ Answer/Explanation
Gravitational field strength is defined as force per unit mass, so its unit is newtons per kilogram, \(N/kg\).
Row A is the only row giving both of these units correctly.
✅ Answer: (A)
▶️ Answer/Explanation
Since \( g = \frac{\text{weight}}{\text{mass}} \), the units of \( g \) must be \( N/kg \).
Row D correctly shows N for weight and N/kg for \( g \).
✅ Answer: (D)
Question
In a room, hot air above a heater rises and is replaced by cool air that falls. What is the name of this process, and how does the density of the hot air compare with the density of the cool air?
▶️Answer/Explanation
Answer: D
Explanation: The process described is convection, where hot air rises because it is less dense than cool air. As the hot air rises, it is replaced by cooler, denser air that falls. Therefore, the correct answer is D, which states that the process is convection and the density of hot air is less than that of cool air.
Question
A man has a mass of 80 kg. The gravitational field strength \( g \) is 10 N/kg.
What is the man’s weight?
A) 8.0 N
B) 80 N
C) 800 N
D) 8000 N
▶️Answer/Explanation
Answer: C) 800 N
Explanation: Weight is calculated using the formula: \[ \text{Weight} = \text{mass} \times \text{gravitational field strength} \] Substituting the values: \[ \text{Weight} = 80\, \text{kg} \times 10\, \text{N/kg} = 800\, \text{N} \]