Section 1 Part A

Section 1 Part A

This is the core material for the section. You must get 100% to proceed.

Units and Prefixes

• You need to know some Quantities and their associated symbols and units.

• You need to know prefixes from micro to Mega.

Multiple Choice

Which of the following are the correct units for these quantities: length, mass, time, speed and electric current?

• m, kg, s, ms^-2, V

• m, kg, s, ms^-1, A

• cm, g, min, cms^-1, A

• m, g, s, ms^-1, A

Multiple Choice

Convert 0.34 km into cm

• 34 000 cm

• 340 000 cm

• 340 cm

• 3 400 cm

Devices

• You need to know how to use common devices.

• Know how to reduce errors.

• How small each device can measure to.

Multiple Choice

What is the smallest scale division on a metre rule?

• 0.5 mm

• 1 mm

• 2 mm

• 1 cm

Multiple Choice

What instrument can be used to measure smaller lengths than a rule can?

• Thermometer

• Micrometer

• Megameter

• Millimeter

Multiple Choice

Here is a close-up of a micrometer. What is the reading on the micrometer?

• 7.24 mm

• 7.24 cm

• 7.74 mm

• 7.74 cm

Multiple Choice

What is the name of the instrument commonly used to measure volumes of liquid in Physics?

• Thermocouple

• Thermometer

• Measuring Cylinder

• Scale

Multiple Choice

Add together the readings on three measuring cylinders in the image. What is the total volume?

• 69.6 cm³

• 68.6 cm³

• 69.0 cm³

• 71.7 cm³

Better measurements

• To make measurments better you should:

• Make bigger measurements

• Repeat and average

Multiple Choice

A student wanted to measure the period of a pendulum of length 70 cm. What equipment will she need?

• Ruler, Stopwatch

• Stopwatch, scale, micrometer

• Ruler, Stopwatch, Multimeter

• Ruler

Multiple Choice

What is the period of a pendulum?

• The time for it to swing from A to B

• The time for it to swing from A to C

• The time for it to swing from A to C and back to B

• The time for it to swing from B to C, then to A then A to B.

Multiple Choice

How can the measurment of the period of a pendulum be improved?

• Use a very short pendulum

• Use a small mass

• Measure the time for many periods and repeat.

• Measure the time for a number of periods and divide by this number.

Multiple Choice

To determine the diameter of a pencil a student measured the width of 10 pencils side by side, and repeated this three times across different places along the pencils. What assumption was made about the pencils?

• They were all HB

• They were all red

• They all had the same width

• They all were sharp

Multiple Choice

To determine the diameter of a pencil a student measured the width of 10 pencils side by side, and repeated this three times across different places along the pencils. The measured data: 782 mm, 778 mm, 769 mm. Calculate the average diameter of the pencils.

• 776 mm

• 77.6 mm

• 2328 mm

• 78 cm