Understanding Measurement in Physics

What are the basic quantities used in physics according to SI?

• Speed, Force, Energy

• Pressure, Volume, Density

• Length, Mass, Time, Electric Current, Thermodynamic Temperature, Amount of Substance, Luminous Intensity

• Frequency, Acceleration, Work

What is the maximum length that a micrometer can measure?

• 0mm to 10mm

• 200mm to 300mm

• 1m to 2m

• 25mm to 100mm, depending on the type of micrometer.

What is the accuracy of a vernier caliper?

• 0.1 inches

• 0.01 mm

• 0.02 mm or 0.001 inches

• 0.05 mm

Which instrument is suitable for measuring lengths up to 1 meter?

• Caliper for measuring small objects

• Ruler with a maximum length of 30 cm

• Protractor for measuring angles

• Meter stick or measuring tape

What should you do to avoid parallax error when measuring length?

• Look at the measurement from above the scale.

• Use a curved ruler for more accuracy.

• Align your eye with the measurement scale.

• Measure from a distance to get a better view.

How does a pointer with a scale help in measurement?

• It provides a digital readout for measurements.

• It eliminates the need for any reference points.

• A pointer with a scale helps in measurement by providing a clear reference for accurate readings.

• It automatically adjusts for environmental factors.

What is the accuracy of a measuring tape?

• 1/2 inch (12 mm) for high-precision tapes

• 1/16 inch (1.5 mm) for standard tapes, better for high-precision tapes.

• 1/8 inch (3 mm) for all tapes

• 1/4 inch (6 mm) for standard tapes

Why is it important to place the eye perpendicular to the scale?

• To increase the distance from the scale for better perspective.

• It is important to place the eye perpendicular to the scale to avoid parallax error and ensure accurate measurements.

• To allow for a wider viewing angle.

• To enhance visibility of the scale markings.

What is the maximum length that a ruler can measure?

• The maximum length of a ruler is 10 feet (3 meters).

• A ruler can measure up to 1 mile (1.6 kilometers).

• The maximum length a ruler can measure is determined by its physical length, commonly up to 100 feet (30 meters) for measuring tapes.

• Rulers can measure any length without limitation.

What is the purpose of using a mirror with a pointer in measurement?

• To provide accurate visual alignment and measurement.

• To create a decorative element in measurement tools.

• To obscure the measurement for privacy.

• To reflect light for artistic purposes.