1
JEE Main 2020 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
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 :
A
0.001 mm
B
0.01 cm
C
0.02 mm
D
0.001 cm
2
JEE Main 2020 (Online) 8th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
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 :
A
h1/3 G2/3 c1/3 A–1
B
h0 c5 G-1 A-1
C
h2/3 c5/3 G1/3 A–1
D
h2 G3/2 c1/3 A–1
3
JEE Main 2020 (Online) 7th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The dimension of $${{{B^2}} \over {2{\mu _0}}}$$, where B is magnetic field and $${{\mu _0}}$$ is the magnetic permeability of vacuum, is :
A
ML2T–2
B
MLT–2
C
ML-1T–2
D
ML2T–1
4
JEE Main 2019 (Online) 12th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of the following combinations has the dimension of electrical resistance ($$ \in $$0 is the permittivity of vacuum and $$\mu $$0 is the permeability of vacuum)?
A
$$\sqrt {{{{ \in _0}} \over {{\mu _0}}}} $$
B
$${{{{ \in _0}} \over {{\mu _0}}}}$$
C
$$\sqrt {{{{\mu _0}} \over {{ \in _0}}}} $$
D
$${{{{\mu _0}} \over {{ \in _0}}}}$$
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