Introduction to Measurements in Physics

What does the study of physics involve?

• Matter study and its composition

• Study of energy and its effects

• Study of matter in relation to energy

• Study of matter in relation to force

Physical quantities that are determined directly through measurements are called_______

• Basic physical quantities

• Derived Physical quantities

• Mechanics physical quantities

• Physics physical quantities

Which combination shows derived physical quantities in measurements

• Length, density, current

• Area, mass, time

• Density, volume, temperature

• Area, energy, density

The fundamental physical quantities that are used in mechanics are:

• Mass, temperature, time

• Electric current, mass, time

• Mass, length, time

• Length, time, amount of substance

A body has a mass of 1600 g and its volume is  $0.002\ m^3$ . Determine its density.

•  $800\ gcm^{-3}$  

•  $800\ kgcm^{-3}$  

•  $0.8\ kgm^{-3}$  

•  $800\ kgm^{-3}$  

The shadow of a metre rule used to estimate the height of a tree is 75cm long and that of the tree is 840 cm long.

What is the estimated height of the tree in metres?

• 11.2 m

• 1120 m

• 1.120 m

• 112 m

When an object of mass 85 g is fully immersed in a measuring cylinder, it displaces a volume of 17 cm ³. What is the density of the object in SI units?

• 5 g/cm ³

• 5000 g/cm ³

• 5000 kg/cm ³

• 5000 kg/m ³

100 drops of water fall from a burette. The first and final readings were 38.0 cm³ and 40.5 cm³ respectively. What is the reading of the burette if 300 drops are allowed to further fall from the burette?

• 48 cm³

• 45.5 cm³

• 33.0 cm³

• 40.5 cm³

The mass of an empty density bottle is 10 g. When full of a liquid of density 800 kg/m³, its mass is 60 g. What is the volume of the empty density bottle?

• 50 cm³

• 62.5 cm³

• 60 cm³

• 10 cm³

In an experiment to determine the density of sand using a density bottle, the following measurements were recorded.

- Mass of empty density bottle = 20 g

- Mass of density bottle full of water = 70 g

-Mass of density bottle with some sand = 80 g

-Mass of density bottle with the sand filled up with water 90 g

Use the above data to determine density of sand.

• 0.6667 g/cm³

• 1500 kg/cm³

• 666.7 g/m³

• 1.5 g/cm³