A resistor of 7 Ω has 11 V across it. Enter the current in amperes.
Correct Answer: 1.571
Explanation:
Ohm’s law gives I=V/R=11/7=1.571 A.
MCQ Collection
China MCQs
Practice China questions with answers and explanations.
A wave has frequency 7 Hz and wavelength 6 m. Enter its speed.
Correct Answer: 42
Explanation:
Wave speed v=fλ=7×6=42 m/s.
Practice context 5: Which statement correctly expresses conservation of momentum?
Choose an option to check your answer.
Correct Answer: C. The total momentum of an isolated system remains constant
Explanation:
In an isolated system, internal forces occur in equal and opposite pairs, so total momentum is constant.
Practice context 4: Which statement correctly expresses conservation of momentum?
Choose an option to check your answer.
Correct Answer: A. The total momentum of an isolated system remains constant
Explanation:
In an isolated system, internal forces occur in equal and opposite pairs, so total momentum is constant.
Practice context 4: For a transverse wave, how is the oscillation direction related to propagation?
Choose an option to check your answer.
Correct Answer: C. It is perpendicular to the direction of wave propagation
Explanation:
A transverse wave oscillates perpendicular to the direction in which the wave travels.
A resistor of 6 Ω has 10 V across it. Enter the current in amperes.
Correct Answer: 1.667
Explanation:
Ohm’s law gives I=V/R=10/6=1.667 A.
A wave has frequency 6 Hz and wavelength 5 m. Enter its speed.
Correct Answer: 30
Explanation:
Wave speed v=fλ=6×5=30 m/s.
A net force accelerates a 6 kg mass at 5 m/s². Enter the force in newtons.
Correct Answer: 30
Explanation:
Newton’s second law gives F=ma=6×5=30 N.
Enter the kinetic energy of a 6 kg object moving at 6 m/s.
Correct Answer: 108
Explanation:
K=½mv²=½×6×6²=108.0 J.
A wave has frequency 5 Hz and wavelength 4 m. Enter its speed.
Correct Answer: 20
Explanation:
Wave speed v=fλ=5×4=20 m/s.
Practice context 3: Which statement correctly expresses conservation of momentum?
Choose an option to check your answer.
Correct Answer: C. The total momentum of an isolated system remains constant
Explanation:
In an isolated system, internal forces occur in equal and opposite pairs, so total momentum is constant.
Practice context 3: For a transverse wave, how is the oscillation direction related to propagation?
Choose an option to check your answer.
Correct Answer: C. It is perpendicular to the direction of wave propagation
Explanation:
A transverse wave oscillates perpendicular to the direction in which the wave travels.