Physics grade 12 unit 1.

1. The spectroscopic techniques are developed by collaborative work of physicists and__________.
A. biologists
B. chemists
C. mathematician
D. astrophysics
2. Athlete Sifan failed down in the truck. A physicist interprets this phenomenon as:
A. she did not get rest.
B. she did not eat food.
C. her center of mass is outside the base.
D. she is overloaded.
3. During inhalation, pressure in our lungs is:
A. greater than atmospheric pressure.
B. the same as atmospheric pressure.
C. less than atmospheric pressure.
D. impossible to compere with atmospheric pressure.
4. One of the following characteristic of sound wave damage our ear drum:
A. High frequency
B. High wavelength
C. High period
D. High intensity
5. Which one of the following branches of physics deals with the concept of photosynthesis?
A. Optical physics
B. Nuclear physics
C. Medical physics
D. Thermodynamics
6. Astronomers use one of the following physics knowledge to describe the motion of planets around the Sun.
A. Magnetic field of the earth
B. Electric charge of the earth
C. Electromagnetism
D. Universal gravitational law
7. Astronomers use
from space object to study how hot the objects are.
A. mechanical energy
B. electromagnetic radiation
C. gravitational force
D. sound wave