The voiceprint lock can be unlocked by identifying a person's voice, which is different according to each person's voice. So far, the number of new energy vehicles in Guangxi has exceeded 300,000. In April 2022 alone, a total of 2,140 public charging piles were built and put into

2024/05/1107:13:33 education 1243

full version! The 2022 Guangxi Beibu Gulf Area High School Entrance Examination Physics Question Paper comes with reference answers.

. The voiceprint lock can be unlocked by recognizing a person's voice, which has different characteristics according to each person's voice (　)

A. Tone b. timbre c. Loudness D. Speed of sound

. Natural phenomena contain rich physical knowledge. The picture is solidified (　)

. So far, the number of new energy vehicles in Guangxi has exceeded 300,000. In April 2022 alone, a total of 2,140 public charging piles were built and put into operation in the region. Regarding the use of charging piles, the ones that comply with safe electricity use are (　)

A. No need to install leakage protector

B. Perform maintenance without disconnecting the power

C. The metal shell of the charging pile is connected to the earth

D. Continue to use the charging plug after the insulation layer is damaged

. On May 31, 2022, the "Kunlong" AG600, a large amphibious aircraft independently developed by my country, successfully made its first flight in Zhuhai, Guangdong. When returning, the aircraft was decelerating and descending (　)

A. The kinetic energy increases and the gravitational potential energy decreases

B. Kinetic energy decreases and mechanical energy remains unchanged

C. As the kinetic energy increases, the gravitational potential energy increases

D. The kinetic energy decreases and the mechanical energy decreases

. As shown in the figure, there is a magnetic field around the energized solenoid . M is a point on a certain magnetic induction line. The small magnetic needle is stationary in the magnetic field. The direction of the magnetic field at the M point and the polarity of the left end of the small magnetic needle are respectively (　)

Interested parties can save or print it out on A4 paper for use.

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