1
NEET 2019
+4
-1
In an experiment, the percentage of error occurred in the measurement of physical quantities A, B, C and D are 1%, 2 %, 3 %and 4 % respectively. Then the maximum percentage of error in the measurement X, where
X = $${{{A^2}{B^{1/2}}} \over {{C^{1/3}}{D^3}}}$$, will be :
A
16%
B
-10%
C
10%
D
$$\left( {{3 \over {13}}} \right)$$%
2
NEET 2018
+4
-1
A student measured the diameter of a small steel ball using a screw gauge of least count 0.001 cm. The main scale reading is 5 mm and zero of circular scale division coincides with 25 divisions above the reference level. If screw gauge has a zero error of –0.004 cm, the correct diameter of the ball is
A
0.521 cm
B
0.525 cm
C
0.053 cm
D
0.529 cm
3
NEET 2017
+4
-1
A physical quantity of the dimensions of length that can be formed out of c, G and $${{{e^2}} \over {4\pi {\varepsilon _0}}}$$ is [c is velocity of light, G is the universal constant of gravitation and e is charge]
A
$${c^2}{\left[ {G - {{{e^2}} \over {4\pi {\varepsilon _0}}}} \right]^{1/2}}$$
B
$${1 \over {{c^2}}}{\left[ {{{{e^2}} \over {G\,4\pi {\varepsilon _0}}}} \right]^{1/2}}$$
C
$${1 \over c}G{{{e^2}} \over {\,4\pi {\varepsilon _0}}}$$
D
$${1 \over {{c^2}}}{\left[ {G{{{e^2}} \over {\,4\pi {\varepsilon _0}}}} \right]^{1/2}}$$
4
NEET 2016 Phase 2
+4
-1
Planck's constant (h), speed of light in vacuum (c) and Newton's gravitional constant (G) are three fundamental constants. Which of the following combinations of these has the dimension of length ?
A
$${{\sqrt {hG} } \over {{c^{3/2}}}}$$
B
$${{\sqrt {hG} } \over {{c^{5/2}}}}$$
C
$$\sqrt {{{hc} \over G}}$$
D
$$\sqrt {{{Gc} \over {{h^{3/2}}}}}$$
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