Q. In a closed loop, if the net current is zero, what can be said about the magnetic field according to Ampere's Law?
A.
The magnetic field is zero everywhere
B.
The magnetic field is uniform
C.
The magnetic field can be non-zero
D.
The magnetic field is only zero at the center
Solution
According to Ampere's Law, if the net current through a closed loop is zero, the line integral of the magnetic field around that loop is also zero, but the magnetic field can still be non-zero in some regions.
Correct Answer:
C
— The magnetic field can be non-zero
Q. In a closed system at equilibrium, if the pressure is increased, what will happen to the equilibrium position if there are more moles of gas on the reactant side?
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Increase in temperature
Solution
Increasing the pressure will shift the equilibrium to the side with fewer moles of gas, which in this case is the right side.
Q. In a closed system, if the internal energy increases, what can be said about the work done and heat added? (2020)
A.
Work done is positive and heat added is negative
B.
Work done is negative and heat added is positive
C.
Both work done and heat added are positive
D.
Both work done and heat added are negative
Solution
According to the first law of thermodynamics, if the internal energy increases, it implies that either work is done on the system or heat is added to the system.
Correct Answer:
C
— Both work done and heat added are positive
Q. In a closed system, if the internal energy increases, what can be said about the heat and work done? (2020)
A.
Heat is added and work is done on the system
B.
Heat is removed and work is done by the system
C.
Heat is added and work is done by the system
D.
No heat exchange occurs
Solution
According to the first law of thermodynamics, if the internal energy increases, it implies that heat is added to the system and/or work is done on the system.
Correct Answer:
A
— Heat is added and work is done on the system
Q. In a closed system, if the temperature of an ideal gas is doubled while keeping the volume constant, what happens to the pressure?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
Solution
According to Gay-Lussac's law, pressure is directly proportional to temperature at constant volume. Therefore, if the temperature doubles, the pressure also doubles.
Q. In a closed system, if the temperature of an ideal gas is doubled while the volume remains constant, what happens to the pressure?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
Solution
According to Gay-Lussac's law, pressure is directly proportional to temperature at constant volume. Therefore, if the temperature doubles, the pressure also doubles.
Q. In a competition, 4 participants received awards. If the total prize money was $2,400, and each received an equal amount, how much did each participant receive?
Q. In a competition, 4 students received awards. If the total prize money was $800, and the first prize was $300, how much was left for the other three awards?
A.
500
B.
400
C.
300
D.
200
Solution
After the first prize of $300, the remaining prize money is $800 - $300 = $500.
