Download App

3.2 , motion in plane — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics3.2 , motion in plane1 Mark
MCQ
The average acceleration vector for a particle having a uniform circular motion is
  • A
    A constant vector of magnitude $\frac{{{v^2}}}{r}$
  • B
    A vector of magnitude $\frac{{{v^2}}}{r}$ directed normal to the plane of the given uniform circular motion
  • C
    Equal to the instantaneous acceleration vector at the start of the motion
  • ✓
    A null vector
✓

Answer

Correct option: D.
A null vector
d
(d)In complete revolution change in velocity becomes zero so average acceleration will be zero.

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 3.2 , motion in plane→3.2 , motion in plane — all question types→Physics STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

A particle is projected horizontally from a tower with velocity $10\,m / s$. Taking $g=10\,m / s ^2$. Match the following two columns at time $t=1\,s$.
Column $I$ Column $II$
$(A)$ Horizontal component of velocity $(p)$ $5$ SI unit
$(B)$ Vertical component of velocity $(q)$ $10$ SI unit
$(C)$ Horizontal displacement $(r)$ $15$ SI unit
$(D)$ Vertical displacement $(s)$ $20$ SI unit
→
Two protons are kept at a separation of 10nm. Let Fn and Fe be the nuclear force and the electromagnetic force between them:
  1. Fe = Fn.
  2. Fe >> Fn.
  3. Fe << Fn.
  4. Fe and Fn differ only slightly.
→
values $2.71$ and $3.70$ ohm at $10°C$ and $100°C.$ The temperature at which the resistance is $3.26$ ohm is .......... $^oC$ 
→
A body weighs $144 \,N$ at the surface of earth. When it is taken to a height of $h=3 \,R$, where $R$ is radius of earth, it would weigh .......... $N$
→
A circular hole of diameter $R$ is cut from a disc of mass $M$ and radius $R ;$ the circumference of the cut passes through the centre of the disc . The moment of inertia of the remaining portion of the disc about an axis perpendicular to the disc and passing through its centre is
→
$A$ block placed on a rough inclined plane of inclination $(\theta =30^o)$ can just be pushed upwards by applying $a$ force $"F"$ as shown. If the angle of inclination of the inclined plane is increased to $(\theta = 60^o)$, the same block can just be prevented from sliding down by application of a force of same magnitude. Thecoefficient of friction between the block and the inclined plane is
→
To a person, going eastward in a car with a velocity of $25\, km/hr$, a train appears to move towards north with a velocity of $25\sqrt 3 $ $km/hr$. The actual velocity of the train will be..........$km/hr$
→
A mass of $2 \,kg$ is whirled in a horizontal circle by means of a string at an initial speed of $5$ revolutions per minute. Keeping the radius constant the tension in the string is doubled. The new speed is nearly ....... $rpm$
→
The following graph represents the $T-V$ curves of an ideal gas (where $T$ is the temperature and $V$ the volume) at three pressures $P_1, P_2$ and $P_3$ compared with those of Charles's law represented as dotted lines.

Then the correct relation is:

→
During motion of a man from equator to pole of earth, its weight will ....... $\%$ (neglect the effect of change in the radius of earth)
→