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20 14 Physics Examination Paper for Senior High School Entrance Examination in Xiangyang City, Hubei Province

Reference answers and analysis of test questions

First, multiple-choice questions (2 points per question)

1.(2 points) (20 14? Hubei) On the horizontal ground, the trolley with a weight of 50N is pulled by a horizontal pulling force of 20N, so that the trolley moves forward in the horizontal direction 10m. The work done by tension in this process is ().

A. 200 BC, 500 BC, 65438 BC

Test center: calculate the workload.

Special topic: work, power and mechanical efficiency.

Analysis: first understand the relationship between f and s in the formula, and then calculate according to the formula W=Fs.

Solution: Solution: Because the distance that the car moves in the horizontal direction under the horizontal pulling force is 10m, the pulling force work is W = FS = 20N× 10m = 200J.

So choose A [Source: Subject Network]

Comments: The key to solve this problem is to know the two necessary factors of work and skillfully use the calculation formula of work to calculate.

2.(2 points) (20 14? Hubei) The water in the kettle gives off "white gas" after boiling, which is caused by the cold water vapor ()

A. sublimation formation B. sublimation formation C. solidification formation D. liquefaction formation

Test center:

Liquefaction and liquefaction phenomenon.

Special topic:

Vaporization and liquefaction, sublimation and sublimation.

Analysis:

The nozzle will emit white gas. First of all, we should know that white gas is liquid, and then analyze how it is formed.

Answer:

The spout spouts "white gas", which is formed because the water vapor spouted from the spout turns into small water droplets and liquefies.

Option: D.

Comments:

This topic examines the liquefaction phenomenon and belongs to a common basic topic.

3.(2 points) (20 14? Hubei) We can see the "reflection" of the house beside the water on the calm water, so this "reflection" is ()

A.

The shadow of the house

B.

The true image of the house

C.

Virtual image of the house

D.

Because of the refraction of light.

Test center:

Reflection of light.

Special topic:

Propagation and reflection of light, plane mirror imaging.

Analysis:

Light will be reflected when it meets the surface of water, glass and many other objects.

Answer:

Solution: The reflection of the shore house on the calm water is because the image of the shore house on the water is a virtual image of a flat mirror, which belongs to the reflection of light.

So choose C.

Comments:

The key to solving the problem is to correctly understand the laws that light follows in the process of propagation and can be used to explain simple problems; This question mainly examines the knowledge points of light reflection, which is not difficult and belongs to the basic question.