Download App

3.1 vectors — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics3.1 vectors1 Mark
MCQ
Three concurrent forces of the same magnitude are in equilibrium. What is the angle between the forces  Also name the triangle formed by the forces as sides
  • ✓
    $120^°$ equilateral triangle
  • B
    $60^°$ equilateral triangle
  • C
    $120^°, 30^°, 30^° $ an isosceles triangle
  • D
    $120^°$ an obtuse angled triangle
✓

Answer

Correct option: A.
$120^°$ equilateral triangle
a
(a) In $N$ forces of equal magnitude works on a single point and their resultant is zero then angle between any two forces is given

$\theta = \frac{{360}}{N}$$ = \frac{{360}}{3} = 120^\circ $

If these three vectors are represented by three sides of triangle then they form equilateral triangle

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from 3.1 vectors→3.1 vectors — all question types→Physics STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Natural length of the spring is $40\ cm$ and its spring constant is $4000\ Nm^{-1}$. A mass of $20\ kg$ is hung from it.The extension produced in the spring is $(g = 9.8\ ms^{-2})$
→
What effect occurs on the frequency of a pendulum if it is taken from the earth surface to deep into a mine
→
A sphere is rolled on a rough horizontal surface. It gradually slows down and stops. The force of friction tries to:
  1. Decrease the linear velocity.
  2. Increase the angular velocity.
  3. Increase the linear momentum.
  4. Decrease the angular velocity.
→
A weightlifter lifts a weight off the ground and holds it up
→
A bomb of mass $9\,kg$ explodes into $2$ pieces of mass $3\,kg$ and $6\,kg.$ The velocity of mass $3\,kg$ is $1.6\, m/s$, the K.E. of mass $6\,kg$ is ............ $J$
→
The thermal radiation emitted by a body is proportional to $\text{T}^n$ where $T$ is its absolute temperature. The value of $n$ is exactly $4$ for:
→
What is the range of the gravitational force?
→
A projectile has the same range $R$ for two angles of projection. If $T_1$ and $T_2$ be the times of flight in the two cases, then $R$ is
→
The additional kinetic energy to be provided to a satellite of mass $m$ revolving around a planet of mass $M,$ to transfer it from a circular orbit of radius $R_1$ to another of radius $R_2\,(R_2 > R_1)$ is 
→
In the $s-t$ equation $\left(s=10+20 t-5 t^2\right)$, match the following columns.
Colum $I$ Colum $II$
$(A)$ Distance travelled in $3\,s$ $(p)$ $-20$ units
$(B)$ Displacement in $1\,s$ $(q)$ $15$ units
$(C)$ Initial acceleration $(r)$ $25$ units
$(D)$ Velocity at $4\,s$ $(s)$ $-10$ units
→