Units and Measurement Test Online MCQs

1. If L = 36 ± 4 mm, B = 14 ± 2 mm, what is the maximum error possible in the determination of x = 2 (L - B):

2. 1 kg f/cm² is equal to:

3. If E, G, J and m represent energy, universal gravitational constant, angular momentum and mass respectively, the dimensions of EJ²/m⁵G²:

4. The unit of co-efficient of thermal conductivity is:

5. The physical quantity which has the dimensional formula M^-1L¹T⁺²

6. When Bernoulli’s theorem is expressed as P/pg + ½ v²/g + h =  constant the dimensions of the constant on the right hand side of the equation are given as:

7. The measured mass and volume of a body are 22.42 gm and 4.7 cm³ with possible error 0.01 gm and 0.1 cc. The maximum error in density is about:

8. On the main scale of vernier calipers, each cm lengths is divided into 10 divisions. In the vernier has to have a least count of 0.005 cm, the vernier scale should have:

9. length were measured in meters and time in seconds but a new unit of mass were chosen in order to make G = 1. How many kilograms would be in this new unit of mass?

10. Which one of the following has been expressed in proper units:

11. The product (PV) has the dimensions:

12. Neutron was discovered by:

13. Dimension of 1/ɛ₀ e²/hc, where e = electronic charge , h = planck constant, c = velocity of light:

14. The dimensional formula of Hall coefficient h is:

15. The approximate distance of the nearest galaxy (Andromeda) is:

16. In the above question, the tolerance when resistors are connected in parallels:

17. The ratio of one kWh to one MeV is:

18. A pressure of 10⁶ dyne/cm² is equivalent to:

19. Error in the measurement of the radius of a sphere is 1%. Then error in the measurement of volume is:

20. Order of magnitude of light year expressed in meters is: