Physics Practice Test – Units, Measurement and Dimensional Analysis (Questions with Answers and Explanations)

The diagram above represents a section of a pair of vernier calipers. The reading on the instrument is _____ 

A. 2.21 cm      B. 0.05 cm     C. 2.26 mm      D. 2.26 cm

The derived unit of pressure can be expressed as ______ 

A. kg ms^-2       B. kg m^-1 s^-2       C. kg m^-2 s^-2       D. kg m^-1 s²

The diagram above illustrates a micrometer screw gauge. Determine its reading. 

A. 10.50 mm      B. 9.46 mm      C. 10.98 mm      D. 11.19 mm

Which of the following physical quantities are derived?

I. Area     II. Thrust     III. Pressure     IV. Mass

A. I, II, III and IV     B. I, II and III only     C. I, II and IV only     D. I and III only

Which of the following statements about the mass and the weight of a body is not correct? It’s ______

A. mass is a scalar quantity
B. weight is a function of the gravitational pull on it
C. mass on earth and on the moon is the same
D. weight at the equator and at the poles is the same