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physical test questions

the amount: 90 minutes out: 100

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a multiple-choice questions (the big issue of 18 small problem, 2 points, a total of 36 points)

1. The following data is closest to the actual situation

A. Ordinary residential building floor height of about 6m B. A small nail by the gravity of approximately 5N

C. Adult normal walking speed of about 5m / s D. Household cooker rated power of about 800W

2. The following phenomena, linear propagation of light can be explained by the fact

A. B. rainbow after the rain Water "Moon" C,IR Network HD Dome Camera. Hand shadow wall D. Mirage