Day 347: JEE Mains Physics

System of Particles and Rotational Motion. Asked once: 25 Jan 2023 (same type asked 5 times) See all 5 of this type

24

$I_{CM}$ is the moment of inertia of a circular disc about an axis (CM) passing through its center and perpendicular to the plane of disc. $I_{AB}$ is its moment of inertia about an axis $AB$ perpendicular to plane and parallel to axis $CM$ at a distance $\frac{2}{3}R$ from center. Where $R$ is the radius of the disc. The ratio of $I_{AB}$ and $I_{CM}$ is $x:9$. The value of $x$ is____

Show model answer

Thermal Properties of Matter. Asked once: 27 Jul 2022 (same type asked 5 times) See all 5 of this type

7

If $K_{1}$ and $K_{2}$ are the thermal conductivities $L_{1}$ and $L_{2}$ are the lengths and $A_{1}$ and $A_{2}$ are the cross sectional areas of steel and copper rods respectively such that $\frac{K_{2}}{K_{1}}= 9,\frac{A_{1}}{A_{2}}= 2,\frac{L_{1}}{L_{2}}= 2$. Then, for the arrangement as shown in the figure. The value of temperature $T$ of the steel - copper junction in the steady state will be:

1. A.
   $18^{\circ}C$
2. B.
   $14\ ^{\circ}C$
3. C.
   $45^{\circ}C$
4. D.
   $150^{\circ}C$

Tap an option to check your answer.

Show answer

Electrostatics. Asked once: 13 Apr 2023 (same type asked 5 times) See all 5 of this type

Motion in a Straight Line. Asked once: 25 Jul 2022 (same type asked 5 times) See all 5 of this type

Wave Optics. Asked once: 27 Jul 2022 (same type asked 5 times) See all 5 of this type