Lesson 7

Question: Choose the correct answer

 

1.      The radius of the earth's orbit.

A.               Astronomical unit.

B.                Atomic mass unit.

C.                Avogadro's Number.

D.               Angular Velocity.

2.      The outer part of the Sun’s “atmosphere.” In the outer region of the corona, particles travel away from the Sun and stretch far out into space. It can only be seen during total solar eclipses, appearing as a halo around the moon.

A.    Dipole

B.     Corona

C.     Aurora

D.    Electron

3.      Full name of the unit Amp.

A.             Amp

B.              Amplitude (of waves)

C.              Ampere

D.             Compass

4.      The rate of change of angular velocity of a body moving along a circular path.

A.               Angle of reflection.

B.                Angular Acceleration.

C.                Angle of incidence.

D.               Amplitude (of an oscillation).

5.      The acceleration produced in a body due to the earth's attraction. It is denoted by the letter g. Its SI unit is m/s². On the surface of the earth, its average value is 9.8m/s². The value of g on the surface of the earth increases in going towards the poles from the equator. It decreases with altitude and with depth inside the earth.

A.    Acceleration. 

B.     Acceleration due to gravity.

C.     Air mass. 

D.    Absolute scale.

6.      Light radiated by ions and atoms in Earth’s upper atmosphere, in the region of Earth’s poles. It can be an extremely impressive spectacle. It australis, or “Southern Lights” occur near the South Pole while the Aurora borealis, or “Northern Lights” occur near the North Pole.

A.           Corona.

B.           Aurora.

C.           Angle of incidence.

D.           Angle of reflection.

7.      The maximum displacement of a body from its mean position during an oscillatory motion.

A.           Amplitude (of waves).

B.           Amplitude (of an oscillation).

C.           Angle of incidence.

D.           Ampere.

8.      Angle of a reflected ray or particle from a surface; measured from a line perpendicular to the surface (the normal).

A.              Angle of incidence.

B.              Angle of reflection.

C.              Angular Acceleration.

D.              Angular Displacement.

9.      Huge bursts of solar wind rising above the Sun’s corona. These are one of the biggest explosions in the Solar System.

A.    Coronal Mass Ejections (CMEs).

B.     Corona.

C.     Aurora.

D.    Electron.

10. A physical state based on the amount and location of electrons and protons in matter. Matter with more electrons than protons is negatively charged. Matter that attracts free electrons is positively charged.

A.           Electron.

B.           Electric charge. 

C.           Electric circuit. 

D.           Angular Velocity.