Download App

Work, Energy, and Power — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsWork, Energy, and Power1 Mark
MCQ
A sphere, a cube and a thin circular plate; all are of the same material and same mass and all of them are initially heated to same high temperature. Then:
  • A
    Plate will cool fastest and cube the slowest.
  • B
    Sphere will cool fastest and cube the slowest.
  • C
    Plate will cool fastest and sphere the slowest.
  • D
    Cube will cool fastest and plate the slowest.
✓

Answer

  1. Plate will cool fastest and sphere the slowest.

Explanation:

The surface area of sphere < surface area of the cube for the given same mass and same density.

The rate of cooling ∝  area of contact with surroundings.

The plate will cool faster than the sphere.

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 Work, Energy, and Power→Work, Energy, and Power — 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 of mass $m$ moves along line $PC$ with velocity $v$ as shown.  What is the angular momentum of the particle about $O$ ​
→
A pendulum clock keeps correct time at $0°C$. Its mean coefficient of linear expansions is $\alpha /^\circ C$, then the loss in seconds per day by the clock if the temperature rises by $t°C$ is
→
Two particles are projected from a tower in opposite directions horizontally with speed $10\,m / s$ each. At $t=1\,s$ match the following two columns.
Column $I$ Column $II$
$(A)$ Relative acceleration between two $(p)$ $0$ SI unit
$(B)$ Relative velocity between two $(q)$ $5$ SI unit
$(C)$ Horizontal distance between two $(r)$ $10$ SI unit
$(D)$ Vertical distance between two $(s)$ $20$ SI unit
→
A machine gun is mounted on a $2000 \,kg$ car on a horizontal frictionless surface. At some instant the gun fires bullets of mass $10\, gm$ with a velocity of $500 \,m/sec$ with respect to the car. The number of bullets fired per second is ten, the acceleration of the car will be .....$\,m/{\sec ^2}$
→
Which of the following statements is correct ?
→
A horizontal circular loop carries a current that looks clockwise when viewed from above. It is replaced by an equivalent magnetic dipole consisting of a south pole S and a north pole N:
  1. The line SN should be along a diameter of the loop.
  2. The line SN should be perpendicular to the plane of the loop.
  3. The south pole should be slow the loop.
  4. The north pole should be below the loop.
→
The graph between terminal velocity (along $y-axis$ ) and square of radius (along $x-axis$ ) of spherical body of density $\rho $ allowed to fall through a fluid of density $\rho $  is $a$
→
Which one of the following is not a unit of young's modulus
→
A man throws ball into the air one after the other. Throwing one when other is at the highest point. How high the balls rise if he throws twice a second?
→
Two satellites of mass $50\,kg$ and $100\,kg$ revolve around the earth in circular orbit of radius $9\,R$ and $16\,R$ respectively, where $R$ is the radius of earth. The speeds of the two satellites will be in the ratio
→