Physical Quantities, Units and Measurements Quiz 2

When there is no wind, the engines of an airship push it due north at 20 m / s.

The wind is blowing from the west at 12 m / s.

Which vector diagram correctly shows how the resultant velocity R of the airship is obtained?

• A

• B

• C

• D

A length of copper pipe, of uniform cross-section and several meters long, carries water to a tap.

• A

• B

• C

• D

A manufacturer measures accurately the dimensions of a wooden floor tile.

The approximate dimensions of the tile are shown.

• A

• B

• C

• D

Which pair of quantities includes one scalar and one vector?

• mass-time

• temperature-time

• temperature-velocity

• velocity-weight

A reel of copper wire is labelled ‘length 30 m’ and ‘diameter 2 mm’. A student calculates the volume of the copper wire.

Which instruments does he use to measure accurately the length and the diameter of the wire?

• A

• B

• C

• D

Which row correctly shows examples of a vector quantity and a scalar quantity?

• A

• B

• C

• D

Vernier calipers read to one tenth of a millimeter.

Which reading is given to this precision?

• 3.3 cm

• 3.31 cm

• 3.310 cm

• 3.312 cm

Velocity is given by the change in displacement divided by the change in time.

How many vector quantities appear in this statement?

• 0

• 1

• 2

• 3

The level of water in a measuring cylinder is 75 cm 3 . A stone of volume 20 cm 3 is lowered into the water.

• 20 cm 3

• 55 cm 3

• 75 cm 3

• 95 cm 3

A plumber measures, as accurately as possible, the length and internal diameter of a straight copper pipe.

The length is approximately 80 cm and the internal diameter is approximately 2 cm.

What is the best combination of instruments for the plumber to use?

• A

• B

• C

• D