Sand is a granular material composed of very small, irregularly-shaped mineral particles. A student determines the density of sand by two methods. She uses the apparatus shown in Fig. 1.1 and Fig. 1.2. Method 1 Describe two possible sources of inaccuracy in the measurements taken in method 1 or method 2 , even if they are carried out carefully. 1 2

Physics

IGCSE&ALevel

CAIE

Exam No：0625_w23_qp_63 Year：2023 Question No：1(d)

Answer:

Knowledge points:

1.1.1 Describe the use of rulers and measuring cylinders to find a length or a volume

1.1.2 Describe how to measure a variety of time intervals using clocks and digital timers

1.1.3 Determine an average value for a small distance and for a short interval of time by measuring multiples (including the period of oscillation of a pendulum)

1.1.4 Understand that a scalar quantity has magnitude (size) only and that a vector quantity has magnitude and direction

1.1.4 (old) Understand that a micrometer screw gauge is used to measure very small distances

1.1.5 Know that the following quantities are scalars: distance, speed, time, mass, energy and temperature

1.1.6 Know that the following quantities are vectors: force, weight, velocity, acceleration, momentum, electric field strength and gravitational field strength

1.1.7 Determine, by calculation or graphically, the resultant of two vectors at right angles, limited to forces or velocities only

1.4.1 Define density as mass per unit volume; recall and use the equation ρ = m/V

1.4.2 Describe how to determine the density of a liquid, of a regularly shaped solid and of an irregularly shaped solid which sinks in a liquid (volume by displacement), including appropriate calculations

1.4.3 Determine whether an object floats based on density data

1.4.3 （old)Describe the determination of the density of an irregularly shaped solid by the method of displacement

1.4.4 Determine whether one liquid will float on another liquid based on density data given that the liquids do not mix

Answer:

Knowledge points:

Solution:

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