Physics

# Frictional force can't be measured in

$\displaystyle kg{ ms }^{ -1 }$

##### SOLUTION
$kgms^{-1}$ is the unit of momentum. Rest all are the units of force. So frictional force can't be measured in $kgms^{-1}$.

You're just one step away

Single Correct Medium Published on 18th 08, 2020
Questions 244531
Subjects 8
Chapters 125
Enrolled Students 201

#### Realted Questions

Q1 Single Correct Medium
The time dependence of a physical quantity $p$ is given by $p=p_0$ exp. $(-\alpha t^2)$, where $\alpha$ is a constant and $t$ is the time. The constant $\alpha$
• A. is dimensionless
• B. has dimensions $T^{-2}$
• C. has dimensions $T^2$
• D. has dimensions of $p$

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q2 Single Correct Medium
The diameter of a sphere is $4.24\ m$. Its surface area with due regard to significant figures is :
• A. 5.65 ${ m }^{ 2 }$
• B. 56.5 ${ m }^{ 2 }$
• C. 565 ${ m }^{ 2 }$
• D. 5650 ${ m }^{ 2 }$

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q3 Subjective Medium
A thermometer placed  under the armpit always shows a lower value than the actual body temperature. Which type of error is demonstrated in its measurement.

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q4 Single Correct Medium
The magnetic force on a point moving charge is $\vec{F}=q(\vec{v}\times \vec{B})$
Here, $q=$ electric charge
$\vec{v}=$ velocity of the point charge
$\vec{B}=$ magnetic field
The dimensions of $\vec{B}$ is:
• A. $[MLT^{-1}A]$
• B. $[MLT^{-2}A^{-1}]$
• C. $[MT^{-2}A^{-1}]$
• D. None of these

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q5 Single Correct Medium
A student uses a metre scale, measuring upto $1\ mm$, to measure the length an breadth of a retangular plate. He finds that length$=5.7\ cm$ and breadth $=3.4\ cm$. What is the percentage error in the area of the plate?
• A. $3.58\%$
• B. $4.7\%$
• C. $5.3\%$
• D. $6.2\%$

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020