JEE Main 2020 (Online) 9th January Morning Slot | Units & Measurements Question 127 | Physics

If the screw on a screw-gauge is given six rotations, it moves by 3 mm on the main scale. If there are 50 divisions on the circular scale the least count of the screw gauge is :

0.001 mm

0.01 cm

0.02 mm

0.001 cm

JEE Main 2020 (Online) 8th January Morning Slot

MCQ (Single Correct Answer)

-1

The dimension of stopping potential V₀ in photoelectric effect in units of Planck's constant 'h', speed of light 'c' and Gravitational constant 'G' and ampere A is :

h^1/3 G^2/3 c^1/3 A^–1

h⁰ c⁵ G^-1 A^-1

h^2/3 c^5/3 G^1/3 A^–1

h² G^3/2 c^1/3 A^–1

JEE Main 2020 (Online) 7th January Evening Slot

MCQ (Single Correct Answer)

-1

The dimension of $${{{B^2}} \over {2{\mu _0}}}$$, where B is magnetic field and $${{\mu _0}}$$ is the magnetic permeability of vacuum, is :

ML²T^–2

MLT^–2

ML^-1T^–2

ML²T^–1

JEE Main 2019 (Online) 12th April Morning Slot

MCQ (Single Correct Answer)

-1

Which of the following combinations has the dimension of electrical resistance ($$ \in $$₀is the permittivity of vacuum and $$\mu $$₀ is the permeability of vacuum)?

$$\sqrt {{{{ \in _0}} \over {{\mu _0}}}} $$

$${{{{ \in _0}} \over {{\mu _0}}}}$$

$$\sqrt {{{{\mu _0}} \over {{ \in _0}}}} $$

$${{{{\mu _0}} \over {{ \in _0}}}}$$

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