Conduction Absorb Before You Solve MCQs Thermal Properties of Matter Physics NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

Three rods of identical dimensions but made of materials of conductivities

K, 2 K, K

$K,~2K,~K$ are connected in series. The two ends

A, B

$A~,B$ are maintained at temperatures of

0^{\circ} C, 100^{\circ} C

$0^{\circ} \text{C},~100^{\circ} \text{C}$ respectively. Assume no loss of heat from the sides. The temperatures of the junctions

X, Y

$X,~Y$ are:

1.

25^{\circ} C, 75^{\circ} C

$25^\circ\text C,~75^\circ\text C$
2.

40^{\circ} C, 60^{\circ} C

$40^\circ\text C,~60^\circ\text C$
3.

20^{\circ} C, 80^{\circ} C

$20^\circ\text C,~80^\circ\text C$
4.

30^{\circ} C, 70^{\circ} C

$30^\circ\text C,~70^\circ\text C$

Subtopic: Conduction |

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Q2:

If the ends of the meter stick are maintained at

θ_{1}

$\theta_1$

^{\circ} C

$^\circ \text{C}$ and

θ_{2}

$\theta_2$

^{\circ} C,

$^\circ \text{C},$ the temperatures measured at the

25

$25$ cm and

80

$80$ cm marks are observed to be

35^{\circ} C

$35^\circ \text{C}$ and

68^{\circ} C

$68^\circ \text{C}$ respectively. Then the temperatures of the left end
(

θ_{1}

$\theta_1$

^{\circ} C

$^\circ \text{C}$ ) and the right end (

θ_{2}

$\theta_2$

^{\circ} C

$^\circ \text{C}$ ) are:

1.	$\theta_{1}=0, ~\theta_{2}=90$
2.	$\theta_{1}=10,~\theta_{2}=85$
3.	$\theta_{1}=20, ~\theta_{2}=80$
4.	$\theta_{1}=30, ~\theta_{2}=100$

Subtopic: Conduction |

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Q3:

Two rods of identical dimensions are joined end-to-end, and the ends of the composite rod are kept at $0^\circ\text{C}$ and $100^\circ\text{C}$ (as shown in the diagram). The temperature of the joint is found to be $40^\circ\text{C}.$ Assuming no loss of heat through the sides of the rods, the ratio of the conductivities of the rods $\dfrac{K_1}{K_2}$ is:

1.	$\dfrac32$	2.	$\dfrac23$
3.	$\dfrac11$	4.	$\dfrac{\sqrt3}{\sqrt2}$

Subtopic: Conduction |

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Q4:

Two rods $A$ and $B$ of different materials are welded together as shown in the figure. Their thermal conductivities are $K_1$ and $K_2.$ The thermal conductivity of the composite rod will be:

1.	$\dfrac{3(K_1+K_2)}{2}$	2.	$K_1+K_2$
3.	$2(K_1+K_2)$	4.	$\dfrac{(K_1+K_2)}{2}$

Subtopic: Conduction |

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