## Matter and Energy _____.

A. Can be converted from one to the other
B. When taken together, conserved in all processes in a closed system
C. Always opposed to each other
D. Both A and B

Correct Answer: D. Both A and B

## The efficiency of a machine cannot exceed ____.

A. 30%
B. 50%
C. 70%
D. 100%

The output work is always less than the input work because some of the input work is used to overcome friction. Therefore, efficiency is always less than 100 percent.

## What is the average air pressure at sea level?

A. 100.325 kilopascals
B. 101.325 kilopascals
C. 103.325 kilopascals
D. 105.325 kilopascals

## Although the mass of a man on the Moon remains the same as on the Earth, he will:

A. Weigh twice as much
B. Weigh One-Sixth as much
C. Weigh the same as on Earth
D. None of the Above

Correct Answer: B. Weigh One-Sixth as much

## Tides are generated by which of the following?

A. Relativistic Quantum fluctuations
B. The movement of Ships in the Sea
C. The movement of the Earth around the Sun
D. The gravitational effect of the Moon and the Sun on our Earth

Correct Answer: D. The gravitational effect of the Moon and the Sun on our Earth

## The Sun produces most of its energy by:

A. Nuclear fission involving the burning of uranium and plutonium
B. Nuclear fusion involves converting hydrogen to helium
C. Nuclear fusion involving the converting of uranium and plutonium
D. Nuclear fission involves burning of hydrogen to helium

Correct Answer: B. Nuclear fusion involves converting hydrogen to helium

## Seasons are generated by the _____.

A. Movement of the Earth around the Sun
B. Movement of the Sun around the center of the Milky way
C. Movement of the Earth around the Moon
D. Movement of the Earth around the center of the Milky way

Correct Answer: A. Movement of the Earth around the Sun

Essentially, seasons in Earth’s atmosphere are created due to movement of Earth through three different temperature bands around Sun. The seasons are caused by the tilt of the Earth’s rotational axis away or toward the sun as it travels through its year-long path around the sun.

## Our Sun is classified as _____.

A. A blue giant
B. Yellow dwarf
C. Supernova
D. Extreme Lave

Yellow dwarf is a star and is often referred to as a G-type main-sequence star. A perfect example of a Yellow dwarf would be the sun. Such a star has about 0.84 to 1.15 solar masses and surface temperatures of between 5,300 and 6,000 K., Tables VII, VIII.

## One light-year is about _____ miles.

A. 5 trillion miles
B. 6 trillion miles
C. 7 trillion miles
D. 8 trillion miles