Unit , Dimensions & Measurements Test Online MCQs

1. The activity of radioactive sample is measured as 9750 counts per minute at t = 0 and as 975 counts per minute at t = 5 minutes, the decay constant is approximately

2. In ₈₈Ra²²⁶ nucleus there are

3. Dimensions of electrical resistance are

4. What is the dimensional formula of gravitational constant?

5. Which of the following pairs does not have similar dimensions?

6. “Parsec” is the unit of:

7. Which of the following physical quantities do not have same dimensions?

8. Velocity of light is equal to

9. The dimensions of Planck’s constant are

10. Given that . Two out of the three vectors are equal in magnitude. The magnitude of the third vector is √2 times that of the other two. Which of the following can be the angles between these vectors? 

11. Using mass (M), length (L), time (T)and current (A) as fundamental quantities, the dimensional formula of permittivity is:

12. What is the dimensions of impedance?

13. The dimensional formula for torque is:

14. The speed of light (c), gravitational constant (G) and plank’s constant (h) are taken as fundamental units in a system. The dimensions of time in this new system should be

15. The dimensions formula of magnetic flux is?