Sri Lanka A/L Physics MCQ Questions

What is the SI unit of luminous intensity?

• LUX

• LUMEN

• CANDELA

• WATT

• JOULE

How many significant figures are in the number 0.02030?

• 2

• 3

• 4

• 5

• 6

Which of the following pairs is conceptually different?

• Force and constant motion difference

• Pressure and unit volume strength

• Work and torque

• Velocity and displacement / time

• Energy and power / time

What is the appropriate instrument to accurately measure the internal diameter of a test tube?

• Meter rule

• Measuring tape

• Micrometer

• Vernier caliper

• Spring scale

What is the appropriate instrument to accurately measure the internal diameter of a test tube?

• Meter ruler

• Measuring tape

• Micrometer

• Vernier caliper

• Spring scale

What is considered the main error in a measurement obtained using a meter ruler?

• Human reaction

• Parallax error

• Background noise

• Zero error

• Thermal expansion

When a micrometer shows a reading of 4.00 mm when fully closed, what type of error is this?

• Random error

• Systematic error

• Positive zero error

• Negative zero error

• No error

What is the most common smallest unit of a standard vernier caliper?

• 0.1 mm

• 0.2 mm

• 0.01 mm

• 0.05 mm

• 1.0 mm

What is the most suitable method to increase the accuracy of a physical measurement?

• Re-measuring and averaging

• Using different instruments

• Increasing the size of the object

What is the most suitable method to increase the accuracy of a physical measurement?

• Repeated measurements and averaging

• Using different instruments

• Increasing the size of the object

• Reducing the temperature

• Avoiding the use of units