Measurements

Class 11 · Physics · 5 questions

Name: ____________________ Date: ____________

Which of these is a derived unit?
- A Metre
- B Second
- C Kilogram
- D Newton
The dimensions of velocity are:
- A [L^2 T^-1]
- B [L T^-1]
- C [L T^-2]
- D [M L T^-1]
How many significant figures are in 0.004050?
- A 3
- B 6
- C 2
- D 4
A length is measured as 2.50 m with an uncertainty of 0.05 m. The percentage uncertainty is:
- A 0.2 percent
- B 5 percent
- C 0.05 percent
- D 2 percent
Which quantity has the dimensions [M L^2 T^-2]?
- A Pressure
- B Force
- C Energy
- D Power

Answer key

1. D, 2. B, 3. D, 4. D, 5. C

Newton is kg m/s2, built from base units.
Velocity is length divided by time.
Leading zeros do not count. The digits 4, 0, 5, 0 give four significant figures.
0.05 / 2.50 x 100 = 2 percent.
Energy = force x distance = M L T^-2 x L = M L^2 T^-2.