The temperature at which the Celsius and Fahrenheit thermometers agree (to give the same numerical value) is:
1. $$-40^\circ$$
2. $$40^\circ$$
3. $$0^\circ$$
4. $$50^\circ$$

Subtopic:  Temperature and Heat |
87%
From NCERT
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On a new scale of temperature, which is linear and called the $$\mathrm{W}$$ scale, the freezing and boiling points of water are $$39^\circ ~\mathrm{W}$$and $$239^\circ ~\mathrm{W}$$ respectively. What will be the temperature on the new scale corresponding to a temperature of $$39^\circ ~\mathrm{C}$$ on the Celsius scale?
1. $$78^\circ ~\mathrm{C}$$
2. $$117^\circ ~\mathrm{W}$$
3. $$200^\circ ~\mathrm{W}$$
4. $$139^\circ ~\mathrm{W}$$

Subtopic:  Temperature and Heat |
83%
From NCERT
AIPMT - 2008
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NEET 2023 - Target Batch - Aryan Raj Singh

The triple points of neon and carbon dioxide are $$24.57$$ K and $$216.55$$ K respectively. The value of these temperatures on Fahrenheit scales will be:

 1 $$-415.44^\circ ~\mathrm{F} ,~-69.88^\circ ~\mathrm{F}$$ 2 $$-248.58^\circ ~\mathrm{F} ,~-56.60^\circ~ \mathrm{F}$$ 3 $$315.44^\circ ~\mathrm{F} ,~-69.88^\circ ~\mathrm{F}$$ 4 $$415.44^\circ ~\mathrm{F} ,~-79.88^\circ~ \mathrm{F}$$

Subtopic:  Temperature and Heat |
66%
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The ice-point reading on a thermometer scale is found to be $$20^\circ,$$ while the steam point is found to be $$70^\circ.$$ When this thermometer reads $$100^\circ ,$$ the actual temperature is:
1. $$80^\circ~\mathrm{C}$$
2. $$130^\circ~\mathrm{C}$$
3. $$160^\circ~\mathrm{C}$$
4. $$200^\circ~\mathrm{C}$$

Subtopic:  Temperature and Heat |
78%
From NCERT
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Mercury having a coefficient of thermal expansion $$\gamma$$ is poured into a thin glass tube, which does not expand on heating. The length of the mercury column is $$L.$$ If the temperature is raised by $$\theta,$$ the new length of the mercury column will be:
1. $$L(1+\gamma\theta)$$
2. $$L(1+\frac\gamma2\theta)$$
3. $$L(1+\frac\gamma3\theta)$$
4. $$L(1+\frac{2\gamma}3\theta)$$
Subtopic:  Thermal Expansion |
58%
From NCERT
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The coefficient of linear expansion of brass and steel rods are $$\alpha_1$$ and $$\alpha_2$$. Lengths of brass and steel rods are $$L_1$$ and $$L_2$$ respectively. If $$(L_2-L_1)$$ remains the same at all temperatures, which one of the following relations holds good?
1. $$\alpha_1L_2^2=\alpha_2L_1^2$$
2. $$\alpha_1^2L_2=\alpha_2^2L_1$$
3. $$\alpha_1L_1=\alpha_2L_2$$
4. $$\alpha_1L_2=\alpha_2L_1$$

Subtopic:  Thermal Expansion |
88%
From NCERT
NEET - 2016
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

The coefficient of area expansion $$\beta$$ of a rectangular sheet of a solid in terms of the coefficient of linear expansion $$\alpha$$ is:
1. $$2\alpha$$
2. $$\alpha$$
3. $$3\alpha$$
4. $$\alpha^2$$

Subtopic:  Thermal Expansion |
90%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

The density of water at $$20^\circ \text{C}$$ is $$998$$ kg/m3 and at $$40^\circ \text{C}$$ is $$992$$ kg/m3. The coefficient of volume expansion of water is:
1. $$3 \times 10^{-4} / ^\circ\text C$$
2. $$2 \times 10^{-4} / ^\circ\text C$$
3. $$6 \times 10^{-4} / ^\circ\text C$$
4. $$10^{-4} / ^\circ\text C$$
Subtopic:  Thermal Expansion |
71%
From NCERT
NEET - 2013
Hints

A rod $$\mathrm{A}$$ has a coefficient of thermal expansion $$(\alpha_A)$$ which is twice of that of rod $$\mathrm{B}$$ $$(\alpha_B)$$. The two rods have length $$l_A,~l_B$$ where $$l_A=2l_B$$. If the two rods were joined end-to-end, the average coefficient of thermal expansion is:
1. $$\alpha_A$$
2. $$\frac{2\alpha_A}{6}$$
3. $$\frac{4\alpha_A}{6}$$
4. $$\frac{5\alpha_A}{6}$$

Subtopic:  Thermal Expansion |
61%
From NCERT
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A brass wire $$1.8$$ m long at $$27$$ °C is held taut with a little tension between two rigid supports. If the wire is cooled to a temperature of$$-39$$ °C, what is the tension created in a wire with a diameter of $$2.0$$ mm? (coefficient of linear expansion of brass $$=2.0 \times10^{-5}$$ K-1, Young's modulus of brass$$=0.91 \times10^{11}$$ Pa)
1. $$3.8 \times 10^3$$ N
2. $$3.8 \times 10^2$$ N
3. $$2.9 \times 10^{-2}$$ N
4. $$2.9 \times 10^{2}$$ N

Subtopic:  Thermal Stress |
67%
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