In an isothermal process for an ideal gas system (where the internal energy doesn't change), which of the following choices best corresponds to the value of the work done on the system?
a. its heat intake
b. twice its heat intake
c. the negative of its heat intake
d. twice the negative of its heat intake
[Ques. 2] When an electromagnet has an iron core inserted, what happens to the strength of the magnet?
a. It increases.
b. It remains the same.
c. It decreases.
d. Since it depends on the metal used in the wires of the electromagnet, any of the above.
[Ques. 3] Heat is applied to an ice-water mixture to melt some of the ice. In this process
a. work is done by the ice-water mixture.
b. the temperature increases.
c. the internal energy increases.
d. all of the above are correct.
[Ques. 4] The magnetic domains in a non-magnetized piece of iron are characterized by which orientation?
a. parallel to the magnetic axis
b. anti-parallel (opposite direction) to the magnetic axis
c. random
d. perpendicular to the magnetic axis
[Ques. 5] Which of the following increases the internal energy of a solid metal rod?
a. raising it to a greater height
b. throwing it through the air
c. having the rod conduct heat
d. having the rod absorb heat
[Ques. 6] An 8.00-cm-long piece of wire is formed into a square, and carries a clockwise current of 0.150 A. The loop is placed inside a solenoid, and the plane of the loop is perpendicular to the solenoid's magnetic field. The solenoid carries a counterclockwise current of 17.0 A, and has 25 turns per centimeter. What is the force on each side of the loop?
a. 1.07E5 N
b. 6.41E4 N
c. 1.60E4 N
d. 4.27E3 N
[Ques. 7] If an ideal gas does positive work on its surroundings, we may assume, with regard to the gas
a. temperature increases.
b. volume increases.
c. pressure increases.
d. internal energy decreases.
[Ques. 8] Solenoid 1 has a length L, cross-sectional area A, and N turns. Solenoid 2 has a length 2L, cross-sectional area 2A, and 2N turns. Which solenoid has the greater magnetic field at its center when equal currents are going through them?
a. 1
b. 2
c. Both have the same magnetic field.
d. Since it depends on the values of A and L, none of the above are correct.
[Ques. 9] According to the first law of thermodynamics, the sum of the heat gained by a system and the work done on that same system is equivalent to which of the following?
a. entropy change
b. internal energy change
c. temperature change
d. specific heat
[Ques. 10] A superconducting solenoid is to be designed to generate a magnetic field of 3.50 T. If the solenoid winding has 984 turns/m, what is the required current? (0 = 4 107 Tm/A)
a. 1.4E+3 A
b. 9.0E+2 A
c. 2.8E+3 A
d. 4.5E+2 A
e. 2.3E+2 A
Quick Reply
