NEET 2023 | Heat and Thermodynamics Question 9 | Physics

NEET 2023

MCQ (Single Correct Answer)

-1

A Carnot engine has an efficiency of $$50 \%$$ when its source is at a temperature $$327^{\circ} \mathrm{C}$$. The temperature of the sink is :-

$$15^{\circ} \mathrm{C}$$

$$100^{\circ} \mathrm{C}$$

$$200^{\circ} \mathrm{C}$$

$$27^{\circ} \mathrm{C}$$

NEET 2022 Phase 2

MCQ (Single Correct Answer)

-1

An ideal gas follows a process described by the equation $$P{V^2} = C$$ from the initial $$({P_1},\,{V_1},\,{T_1})$$ to final $$({P_2},\,{V_2},\,{T_2})$$ thermodynamic states, where C is a constant. Then

If $${P_1} > {P_2}$$ then $${V_1} > {V_2}$$

If $${P_1} > {P_2}$$ then $${T_1} < {T_2}$$

If $${V_2} > {V_1}$$ then $${T_2} > {T_1}$$

If $${V_2} > {V_1}$$ then $${T_2} < {T_1}$$

NEET 2022 Phase 2

MCQ (Single Correct Answer)

-1

Two rods one made of copper and other made of steel of same length and same cross sectional area are joined together. The thermal conductivity of copper and steel are 385 J s^$$-$$1 K^$$-$$1 m^$$-$$1 and 50 J s^$$-$$1 K^$$-$$1 m^$$-$$1 respectively. The free ends of copper and steel are held at 100$$^\circ$$C and 0$$^\circ$$C respectively. The temperature at the junction is, nearly :

$$88.5^\circ C$$

$$12^\circ C$$

$$50^\circ C$$

$$73^\circ C$$

NEET 2022 Phase 2

MCQ (Single Correct Answer)

-1

Three vessels of equal capacity have gases at the same temperature and pressure. The first vessel contains helium (monoatomic), the second contains fluorine (diatomic) and the third contains sulfur hexafluoride (polyatomic). The correct statement, among the following is :

The root mean square speed of sulfur hexafluoride is the largest

All vessels contain unequal number of respective molecules

The root mean square speed of molecules is same in all three cases

The root mean square speed of helium is the largest

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