Measurements

What is the SI base unit of length?

A student measures the length of a table as 2.35 m with a measuring tape having a least count of 0.01 m. What is the absolute error in the measurement?

If the measured length of a rod is 1.20 m with an absolute error of ±0.02 m, what is the percentage error?

Which of the following instruments is most suitable for measuring the diameter of a thin wire with high precision?

The least count of a vernier caliper is 0.02 cm. If the main scale reading is 3.4 cm and the vernier scale reading coincides at 7th division, what is the total length measured?

In an experiment, the time period T of a pendulum is given by T = 2π√(l/g). If the length l is measured with an error of 1% and g is known exactly, what is the approximate percentage error in T?

Which of the following statements about systematic errors is TRUE?

A student uses a stopwatch with a reaction time of ±0.2 s to measure the time taken by a ball to fall 5 m. The theoretical time is approximately 1.01 s. What is the main source of error in this measurement?

The density of a metal is calculated using the formula ρ = m/V. If the mass m is measured as 200 g with ±1 g error and volume V as 50 cm³ with ±2 cm³ error, what is the approximate percentage error in density?

Which of the following is NOT a fundamental SI unit?