BITSAT 2025 | Heat and Thermodynamics Question 3 | Physics

In a certain process, 400 cal of heat is supplied to a system and at the same time 105 J of mechanical work was done on the system. The increase in its internal energy is

20 cal

303 cal

404 cal

425 cal

BITSAT 2025

MCQ (Single Correct Answer)

-1

Two rods $P$ and $Q$ have equal lengths. Their thermal conductivities are $K_1$ and $K_2$ and cross-sectional areas are $A_1$ and $A_2$. When the temperature at ends of each rod are $T_1$ and $T_2$ respectively, the rate of flow of heat through $P$ and $Q$ will be equal, if

$\frac{A_1}{A_2}=\frac{K_2}{K_1}$

$\frac{A_1}{A_2}=\frac{K_2}{K_1} \times \frac{T_2}{T_1}$

$\frac{A_1}{A_2}=\sqrt{\frac{K_1}{K_2}}$

$\frac{A_1}{A_2}=\left(\frac{K_2}{K_1}\right)^2$

BITSAT 2024

MCQ (Single Correct Answer)

-1

In the given cycle $ A B C D A $, the heat required for an ideal monoatomic gas will be

BITSAT 2024 Physics - Heat and Thermodynamics Question 5 English

$ p_{0} V_{0} $

$ \frac{13}{2} p_{0} V_{0} $

$ \frac{11}{2} p_{0} V_{0} $

$ 4 p_{0} V_{0} $

BITSAT 2024

MCQ (Single Correct Answer)

-1

In a mixture of gases, the average number of degree of freedoms per molecule is 6 . The rms speed of the molecule of the gas is $ c $, then the velocity of sound in the gas is

$ \frac{c}{\sqrt{3}} $

$ \frac{c}{\sqrt{2}} $

$ \frac{2 c}{3} $

$ \frac{3 c}{3} $

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