Question 27 to 35.
27. A sheet of copper has an area of 500cm2 at what is the area at 500C? For copper, linear expansibility is 1.67x10k-¹
(a)502.7cm² (b) 500.84cm² (d)500.05cm²
(c)500.42cm³
The pressure and absolute temperature of the gas sample whose volume is fixed are related with
one or more of the following
( 1)\frac{p_{1}}{r_{1}}=\frac{p_{2}}{r_{2}} (b)
() \frac{p_{2}}{r_{1}}\approx\frac{p_{1}}{r_{2}} ) \frac{p_{1}}{T_{2}}=\frac{p_{2}}{r_{1}}
\frac{p_{1}}{T_{1}}=\frac{T_{2}}{p_{2}}
29. A fixed mass a gas occupies 10 m³ at standard temperature and pressure what volume does the gas occupy at 1'7 if its pressure is 72cmHg.
(a)11.2×10m³ (b)2.11x10m³ (c) 112\times10^{-3}m^{3}
(d) 451x10m³
30.
A liquid of specific heat capacity 3000J/kgK
rises from a temperature 15 to 65 in Imin, when an electric heater is used. If the heater generate 63Kwatt/min calculated the mass of liquid
(a)0.04kg (b)0.42kg (c) 4.2g(d)0.44g
31 . In thermodynamics, surrounding refers to as...
(a) environment (b) region of space outside the thermodynamic system (c) state of being or a
thermodynamic system (d) region or space inside
thermodynarnic system
32. A process that eventually returns a system to its
initial state is cailed...
(a) an isothermal process (b) engage process (c)
cyclic process (d) isothermal process
33. If a system is said to have a constant internal energy, then it is called (a) isolated system (b) ideal system (c) living
system (d) imaginary system
34. All the following are state variable (state
coordinate) except... (a) temperature (b) pressure (c) surface tension (d) volume
35. In the kinetic theory of gasses, gas molecules are said to
(a) remain immobile (b) be tightly bound together (c) have electric and torsion forces (d) collide with one another and with the walls of the container in which they are enclosed
27. The area of the copper sheet will not change with temperature, so the area at 500C will still be 500cm². Therefore, the correct answer is (d) 500.05cm².
29. According to Boyle's Law, the product of pressure and volume is constant at constant temperature. We can set up the equation: p1V1 = p2V2. Plugging in the values, we have (1 atm)(10 m³) = (72 cmHg)(V2). Converting cmHg to atm, we have (1 atm)(10 m³) = (0.947 atm)(V2). Solving for V2, we get V2 = 10.57 m³. Therefore, the correct answer is (d) 451x10m³.
30. We can use the formula Q = mcΔT, where Q is the heat energy, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature. Rearranging the equation, we have m = Q / (cΔT). Plugging in the values, we have m = (63 kWatt/min) / (3000 J/kgK * (65 - 15)). Simplifying the units, we have m = (63 * 10^3 J/min) / (3 * 10^6 J/kgK * 50 K) = 0.42 kg. Therefore, the correct answer is (b) 0.42 kg.
31. The surrounding refers to the environment or the region of space outside the thermodynamic system. Therefore, the correct answer is (a) environment.
32. A process that eventually returns a system to its initial state is called a cyclic process. Therefore, the correct answer is (c) cyclic process.
33. If a system is said to have a constant internal energy, then it is called an isolated system. Therefore, the correct answer is (a) isolated system.
34. State variables, also known as state coordinates, are properties of a system that depend only on the current state of the system and not on how it got there. Temperature, pressure, and volume are all state variables. However, surface tension is not a state variable as it can change depending on the presence of other substances or factors. Therefore, the correct answer is (c) surface tension.
35. In the kinetic theory of gases, gas molecules are said to collide with one another and with the walls of the container in which they are enclosed. Therefore, the correct answer is (d) collide with one another and with the walls of the container in which they are enclosed.