Physical Quantities, units and measurements:

Question 1

Difference between random and systematic error

Answer 1

Random error causes one measurement to differ slightly from the next. It comes from unpredictable changes during an experiment. Systematic error always affects measurements the same amount or by the same proportion, provided that a reading is taken the same way each time. It is predictable.

Question 2

Difference between accuracy and precision

Answer 2

Accuracy measures how close results are to the true or known value. Precision, on the other hand, measures how close results are to one another.

Question 3

Which factors affect a pendulum’s period?

Answer 3

Length of the String

Angle of Release

Question 4

Which instrument to use when measuring length smaller than 2 cm?

Answer 4

Micrometer screw gauge

Question 5

What is the diameter of Earth?

Answer 5

approximately 10^6 km