81. The digestion of food in the body is known as:
a) Respiration
b) Digestion
c) Excretion
d) Circulation
When food is broken down into smaller absorbible parts to be used by the body as energy and growth, it is the complex process known as digestion.
82. The large muscle in the human body is the strongest relative to its size:
a) Thigh muscle
b) Jaw muscle (Masseter)
c) Heart
d) Bicep
The jaw muscle or masseter is the heaviest based on mass. It is capable of closing the teeth with up to 55 pounds (25 kg) on the incisors.
83. The universe is the richest in:
a) Oxygen
b) Hydrogen
c) Helium
d) Carbon
Hydrogen is the lightest and most common element comprising approximately 75 percent of the mass of all the elements in the universe.
84. Common salt chemical formula:
a) NaClO
b) NaCl
c) NaHCO3
d) Na2CO3
Sodium Chloride is common table salt. It has a chemical formula: NaCl, which means that there are one sodium (Na) atom and one chlorine (Cl) atom bonded together.
85. What gas is called Laughing Gas?
a) Carbon Dioxide
b) Oxygen
c) Nitrous Oxide (N2O)
d) Hydrogen
Nitrous oxide (N2O) is also known as laughing gas since it produces an euphoric feeling of laughing when inhaled.
86. The acid of vinegar is:
a) Hydrochloric Acid
b) Sulfuric Acid
c) Acetic Acid
d) Citric Acid
Vinegar is generally a 5-8% of Acetic Acid (CH3COOH) mixed with water and that is what makes it acidic in flavor and pungent smell.
87. Which is a noble gas?
a) Oxygen
b) Chlorine
c) Argon
d) Nitrogen
Noble gases are inert and located in Group 18 of the periodic table. One of them is called Argon, and it is typically found in light bulbs.
88. The metal that is used to make airplanes is:
a) Copper
b) Lead
c) Aluminum
d) Silver
Planes made of aluminum and its alloys are very widely used in making aircrafts, due to the fact that it is very strong, light, and corrosion resistant.
89. That planet is called the Red Planet:
a) Venus
b) Jupiter
c) Mars
d) Saturn
Mars has a reddish color, given its surface has iron oxide (rust), and this is how it became known as the Red Planet.
90. A moving body possesses:
a) Potential Energy
b) Kinetic Energy
c) Chemical Energy
d) Heat Energy
Kinetic energy is the energy of a body which it has as a result of movement. Kinetic energy is dependent on the mass and speed.
91. What is the shortest wavelength of color of light?
a) Red
b) Green
c) Yellow
d) Violet
Violet light is the shortest and most high-frequency wavelength in the visible spectrum of light (VIBGYOR).
92. The unit of power is:
a) Joule
b) Watt
c) Newton
d) Volt
Watt (W) is a SI unit of power, and it is used to measure the amount of energy passed on in one second.
93. The closest star to the Earth (since the Sun) is:
a) Sirius
b) Proxima Centauri
c) Alpha Centauri
d) Polaris
Proxima Centauri belongs to the system of stars of Alpha Centauri and is the nearest one to the Sun, being approximately 4.24 light-years.
94. How long would it take the light of the Sun to reach the earth?
a) 8 seconds
b) 8 minutes
c) 8 hours
d) 8 days
The Sun is separated by approximately 150 million kilometers of Earth. Light moves at the speed of 300,000 km/s, which takes about 8 minutes and 20 seconds to reach us.
95. The science of studying earthquakes is known as:
a) Ecology
b) Astronomy
c) Seismology
d) Geology
Seismology refers to the science that deals with earthquakes and all the related phenomena such as the transmission of seismic waves.
96. Which of them is a greenhouse gas?
a) Oxygen
b) Nitrogen
c) Carbon Dioxide
d) Argon
Carbon Dioxide (CO2) is one of the major greenhouse gases. This traps heat in the atmosphere of the earth, thus adding to the greenhouse effect and global warming.
97. The most difficult part of a human tooth is:
a) Dentin
b) Enamel
c) Pulp
d) Cementum
Enamel is the hard, outermost layer of the tooth and it is the hardest material in the human body.
98. The primary energy source on the earth is:
a) Moon
b) Sun
c) Wind
d) Coal
The sun is the ultimate power of most of the processes on earth and is the origin of weather, climate, and photosynthesis, which make up the foundation of most food chains.
99. What is a communicable disease?
a) Diabetes
b) Cancer
c) Influenza (Flu)
d) Asthma
Influenza or the flu is a very contagious (communicable) viral infection that is transmitted by air or contact.
100. Evaporating a liquid to a gas at boiling point is referred to as:
a) Evaporation
b) Boiling / Vaporization
c) Condensation
d) Sublimation
Vaporization is the transformation of a liquid into a gas. When it happens within the liquid at a certain temperature, it is referred to as boiling.
