MCQ
The dimensions of $\frac{m e^4}{8 \varepsilon_0^2 h^3 c}$ is __________ .
- A$M ^0 L^0 T^0$
- ✓$M ^0 L^{-1} T^0$
- C$M ^0 L^1 T^0$
- D$M ^{-1} L^0 T^0$
✓
Answer
Correct option: B.
$M ^0 L^{-1} T^0$
B
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
What is the coefficient of mutual inductance when the magnetic flux changes by 2 
and change in current is 0.01A
|
(a) 2 henry |
(b) 3 henry |
(c) |
(d) Zero |
The current gain of a transistor in common base mode is 0.995. The current gain of the same transistor in common emitter mode is?
The angular momentum of the electron in hydrogen atom in the ground state is:
If a diamagnetic solution is poured into a U-tube and one arm of this U-tube placed between the poles of a strong magnet with the meniscus in a line with the field, then the level of the solution will
|
(a) Rise |
(b) Fall |
(c) Oscillate slowly |
(d) Remain as such |
Two thin lenses of focal lengths 
and 
are in contact and coaxial. The combination is equivalent to a single lens of power
|
(a) |
(b) |
(c) |
(d) |
An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from room temperature 20℃ ? The temperature of boiling water is 100℃
|
(a) 6.4 minutes |
(b) 6.3 minutes |
(c) 12.6 minutes |
(d) 12.8 minutes |
Image formed by a concave mirror of focal length 6 cm, is 3 times of the object, then the distance of object from mirror is
|
(a) – 4 cm |
(b) 8 cm |
(c) 6 cm |
(d) 12 cm |
A proton and an electron are placed in a uniform electric field.
- The electric forces acting on them will be equal.
- The magnitudes of the forces will be equal.
- Their accelerations will be equal.
- The magnitudes of their accelerations will be equal.
Alnico is used for making permanent magnets because it has:
Total internal reflection of light is possible when light enters from
|
(a) Air to glass |
(b) Vacuum to air |
(c) Air to water |
(d) Water to air |