CIE iGCSE Co-Ordinated Science P1.3 Mass and weight Exam Style Questions Paper 1
Question
The weight of an object of mass m is given by the expression mg.
Which row gives the units for weight and g?
▶️Answer/Explanation
Ans : D
Question
Which row gives the units for mass m and gravitational field strength g ?
▶️Answer/Explanation
Ans: A
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: \[ \text{Weight} = 80\, \text{kg} \times 10\, \text{N/kg} = 800\, \text{N} \]
Question
Which row gives the unit for mass and the unit for weight?
▶️Answer/Explanation
Answer: B. kg, N
Explanation: Mass is measured in kilograms (kg), while weight is a force measured in newtons (N).
Question
A hiker has a mass of 80 kg and is carrying a bag of mass 9.0 kg.
The gravitational field strength \( g \) is 10 N/kg.
What is the combined weight of the hiker and her bag?
A. 89 kg
B. 89 N
C. 890 kg
D. 890 N
▶️Answer/Explanation
Answer: D. 890 N.
Explanation: Weight = mass × gravitational field strength. Total mass = 80 kg + 9 kg = 89 kg. Weight = 89 kg × 10 N/kg = 890 N.
Question
On Earth the gravitational field strength \( g \) is 10 N/kg. What is the mass of an object that weighs 150 N on Earth?
A) 1.5 kg
B) 15 kg
C) 150 kg
D) 1500 kg
▶️Answer/Explanation
Answer: B) 15 kg
Explanation: The mass of an object can be calculated using the formula \( \text{mass} = \frac{\text{weight}}{\text{gravitational field strength}} \). Substituting the given values, \( \text{mass} = \frac{150 \, \text{N}}{10 \, \text{N/kg}} = 15 \, \text{kg} \).
Question
Which statement is correct?
A. Mass is a force and its unit is the kilogram.
B. Mass is a force and its unit is the newton.
C. Weight is a force and its unit is the kilogram.
D. Weight is a force and its unit is the newton.
▶️Answer/Explanation
Answer: D
Explanation: Weight is a force due to gravity, and its unit is the newton (N). Mass is a measure of the quantity of matter, and its unit is the kilogram (kg).