Physics

The random error in the arithmetic mean of 100 observations is x, then random error in the arithmetic mean of 400 observations would be

$4x$

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Single Correct Medium Published on 18th 08, 2020
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Realted Questions

Q1 Single Correct Medium
The dimensions of angular momentum, latent heat and capacitance are, respectively.
• A. $ML^{2}T^{1}A^{2}, L^{2}T^{-2}M^{-1}L^{-2}T^{2}$
• B. $MLT^{2}, L^{2}T^{2}, M^{-1}L^{-2}T^{4}A^{2}$
• C. $ML^{2}T^{-1}, L^{2}T^{-2}, ML^{2}TA^{2}$
• D. $ML^{2}T^{-1}, L^{2}T^{-2}, M^{-1}L^{-2}T^{4}A^{2}$

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q2 Single Correct Medium
If the speed of light (c) , acceleration due to gravity (g) and pressure (p) are taken as the fundamental quantities , then the dimensions of length will be
• A. $c^2g^{-1}p^0$
• B. $cg^0p^{-1}$
• C. $c^{-1}gp^0$
• D. $cg^{-1}p^0$

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q3 Single Correct Medium
The time of oscillation $T$ of a small drop of liquid depends on radius $r$, density $\rho$ and surface tension $S$. The relation between them is given by
• A. $T\propto \sqrt {\dfrac {S}{\rho r^3}}$
• B. $T\propto \sqrt {\dfrac {\rho r^3}{S}}$
• C. $T\propto \sqrt {\dfrac {S^2r^3}{\rho}}$
• D. $T\propto \sqrt {\dfrac {\rho r^3}{2S}}$

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q4 Single Correct Medium
In a new system of units, unit of mass is $10\ kg$, unit of length is $1\ km$ and unit of time is $1\ minute$. The value of $1\ joule$ in this new hypothetical system is :
• A. $3.6\times10^{-4}$ new units
• B. $6\times10^{7}$ new units
• C. $10^{11}$ new units
• D. $1.67\times10^{4}$ new units

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q5 Single Correct Medium
How many order of magnitude are there in one million?
• A. 5
• B. 4
• C. 6
• D. None of above

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020