1
WB JEE 2024
MCQ (Single Correct Answer)
+1
-0.25
Change Language

Which of the following quantity has the dimension of length ?

(h is Planck's constant, m is the mass of electron and c is the velocity of light)

A
$$\frac{\mathrm{hc}}{\mathrm{m}}$$
B
$$\frac{\mathrm{h}}{\mathrm{mc}^2}$$
C
$$\frac{\mathrm{h}^2}{\mathrm{mc}^2}$$
D
$$\frac{\mathrm{h}}{\mathrm{mc}}$$
2
WB JEE 2023
MCQ (Single Correct Answer)
+1
-0.25
Change Language

In an experiment, the length of an object is measured to be 6.50 cm. This measured value can be written as 0.0650 m. The number of significant figures on 0.0650 m is

A
3
B
4
C
2
D
5
3
WB JEE 2023
MCQ (Single Correct Answer)
+2
-0.5
Change Language

A modified gravitational potential is given by $$\mathrm{V}=-\frac{\mathrm{GM}}{\mathrm{r}}+\frac{\mathrm{A}}{\mathrm{r}^{2}}$$. If the constant A is expressed in terms of gravitational constant (G), mass (M) and velocity of light (c), then from dimensional analysis, A is,

A
$$\frac{G^{2} M^{2}}{c^{2}}$$
B
$$\frac{\mathrm{GM}}{\mathrm{c}^{2}}$$
C
$$\frac{1}{c^{2}}$$
D
Dimensionless
4
WB JEE 2022
MCQ (Single Correct Answer)
+1
-0.25
Change Language

Given : The percentage error in the measurements of A, B, C and D are respectively, 4%, 2%, 3% and 1%. The relative error in $$Z = {{{A^4}{B^{{1 \over 3}}}} \over {C{D^{{3 \over 2}}}}}$$ is

A
$${{127} \over 2}\% $$
B
$${{127} \over 5}\% $$
C
$${{127} \over 6}\% $$
D
$${{127} \over 7}\% $$
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