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Science and Technology Drills For LET

Total questions: 150

Worksheet time: 1hrs 15mins

Name
Class
Date
1.

A living organism thrives best in its ______.

a)

geography

b)

colony

c)

habitat

d)

settlement

2.

Modern taxonomy is to Karol Linnaeus, as ancient taxonomy is to ______.

a)

Plato

b)

Socrates

c)

Sophocles

d)

Aristotle

3.

The 2 waste products of the citric acid cycle are ______.

a)

hydrogen and nitrogen

b)

water and carbon dioxide

c)

carbon dioxide and hydrogen

d)

water and nitrogen

4.

Sound will travel fastest in ______.

a)

water

b)

air

c)

solid

d)

plastic

5.

The Philippines lies in a place where there are many volcanoes which make it prone to ______.

a)

typhoon

b)

drought

c)

flooding

d)

earthquake

6.

Since most organisms consume more than one type of animal or plant or consume both, the transfer of matter and energy intertwine into the ______.

a)

Food consumer

b)

Food web

c)

Food producer

d)

Food chain

7.

Conduction is to solids, as radiation is to ______.

a)

Gas

b)

Plasma

c)

Liquid

d)

Serum

8.

Conduction, convention and radiation are ways of transferring or transforming energy through the use of ______.

a)

Heat

b)

Force

c)

Waves

d)

Electricity

9.

The abbreviations sin, tan, sec for sine, tangent and secant are to Albert Gerard, as using common logarithms in measuring the intensity of earthquakes is to ______.

a)

Alexander Bell

b)

George Dantzig

c)

Johann Kepler

d)

Charles Richter

10.

The least harmful energy to the atmosphere to the atmosphere because it does not emit pollution is ______.

a)

Fossil fuels

b)

Slash-and-burn agriculture

c)

Dry cell energy

d)

Nuclear energy

11.

The practical application of scientific knowledge on daily human activities is ______.

a)

Technology

b)

Innovation

c)

Invention

d)

Discovery

12.

A food chain is illustrated by the following link line ______.

a)

Bacteria-grass-goat-human

b)

Human-goat-human-grass

c)

Grass-goat-human-bacteria

d)

Goat-human-bacteria-grass

13.

The major concern about global warming arises from increased concentrations of ______.

a)

Nitrogen oxides

b)

Greenhouse gases

c)

Sulfur oxides

d)

Photochemical smog

14.

The laws of heredity were the results of the study of ______.

a)

Alexander Fleming

b)

Charles Darwin

c)

Gregor Johann Mendel

d)

Marie Curie

15.

An orchid attached to a coconut tree is example of ______.

a)

osmosis

b)

commensalism

c)

parasitism

d)

predation

16.

The best reliable source of scientific knowledge is ______.

a)

educated guess

b)

empirical study

c)

interview result

d)

personal experience

17.

After an earthquake of 7.8 magnitude of earthquake in 1990, the ______ erupted.

a)

Mt. Pinatubo

b)

Mt. Mayon

c)

Mt. Apo

d)

Taal Volcano

18.

The following are energy and food decomposers EXCEPT ______.

a)

Earthworm

b)

fungi

c)

Termite

d)

plant

19.

Medicine is benefited by scientific development of ______.

a)

Access to information

b)

control of diseases

c)

Information dissemination

d)

research capability

20.

Why are dams thicker at their bottoms than at their tops?

a)

Water is denser at the bottom

b)

The temperature is higher at the bottom

c)

Water weighs more at the bottom

d)

Water pressure is higher at the bottom

21.

Energy transferred illustrated by connecting a powerbank to an active cellphone is ______ energy.

a)

potential

b)

chemical

c)

kinetic

d)

nuclear

22.

Sahara is to dessert biome as the Arctic is to the _____ biome.

a)

Tundra

b)

mountain

c)

Forest

d)

grassland

23.

Symbiotic relationship between orchid on the trunk of a tree; bird with nest on tree’s branches, clownfish and sea anemone refers to relationship which is ______.

a)

Parasitism

b)

Mutualism

c)

Commensalism

d)

Reciprocity

24.

All of the following contribute to environmental conservation EXCEPT ______.

a)

carburetor exhaust

b)

energy conservation

c)

waste segregation

d)

reforestation

25.

Zebra, horse and donkey have similar characteristics because they belong to the same ______.

a)

taxonomy

b)

rank

c)

species

d)

genus

26.

Which sector of the economy consumes the most energy?

a)

residential

b)

transportation

c)

electric utilities

d)

industry

27.

Salinity, temperature, waves currents that affects the Ocean Ecosystem are described as ______.

a)

Biotic

b)

behavioral

c)

Abiotic

d)

community

28.

Regulating hunting is ensuring the preservation of endangered ______.

a)

Animals

b)

forests

c)

Trees

d)

plants

29.

Conserved wetlands and forests, invisible chemical cycles that redistribute water, oxygen, and carbon through the world’s living and non-living systems are the basic characteristics of an ecosystem that is ______.

a)

Diverse

b)

biotic

c)

Sustainable

d)

balanced

30.

The highest category in the classification of plants and animals is ______.

a)

Genus

b)

Phylum

c)

Species

d)

Domain

31.

What will happen to a cell in hypertonic solution?

a)

The plant cell will have edema

b)

The plant cell will rupture

c)

No effect on the cell

d)

The plant cell will shrink

32.

Which of the following organism feeds on necrotic and decaying matter?

a)

Vulture

b)

Algae

c)

Parakeet

d)

Yeast

33.

Who is known as the Father of Modern Taxonomy and is responsible for coining Homo sapiens in humans?

a)

A.H. Coplan

b)

Charlton

c)

Aristotle

d)

Linnaeus

34.

The hierarchy of biology taxonomy has how many levels?

a)

10

b)

5

c)

6

d)

8

35.

Kingdom Plantae includes which organisms?

a)

Prokaryotes

b)

Magnoliidae

c)

Fungi

d)

Protozoa

36.

Organisms that decompose substances into products that can be useful are called ___.

a)

Herbivores

b)

Saproilites

c)

Carnivores

d)

Saprophytes

37.

Which of the following is a heterotroph?

a)

Algae

b)

Grasshopper

c)

Fern

d)

Moss

38.

What organism would most likely be in an arctic environment?

a)

Crocodile

b)

Walrus

c)

Turtle

d)

Maya Bird

39.

Predation is a relationship exemplified by a _______.

a)

hunter shooting a duck in the forest and having it for dinner

b)

a clownfish living within a sea anemone

c)

a tapeworm living in the gastrointestinal tract of a toddler

40.

A mango tree is planted beside a sampaguita plant in a garden. They demonstrate ______.

a)

mutualism

b)

competition

c)

predation

d)

commensalism

41.

The following are homologous organs, EXCEPT:

a)

seal's flipper

b)

bat's wing

c)

human arm

d)

fish tail

42.

Which of the following is a segmented worm that can be used to facilitate anticoagulation?

a)

Bloodworms

b)

Earthworms

c)

Maggots

d)

Leeches

43.

Monosaccharides, oligosaccharides and polysaccharides are types of ______.

a)

Proteins

b)

Lipids

c)

Nucleotides

d)

Carbohydrates

44.

If carbohydrates are hydrophilic-organic compounds, lipids are ______ organic compounds.

a)

Simple

b)

Polypeptide

c)

Hydrophobic

d)

Biomolecules

45.

Oxygen is the waste product of the process of ______.

a)

Carburetor exhaust

b)

Oxidation

c)

Photosynthesis

d)

Conversion

46.

What is the process used by plants to convert the energy from sunlight into chemical energy?

a)

Photosynthesis

b)

Diffusion

c)

Photochemical conversion

d)

Cytolysis

47.

Which of the following convert the energy from sunlight into chemical energy?

a)

plants

b)

animals

c)

virus

d)

mammals

48.

Carbon dioxide is produced by plants in the ______.

a)

Evening

b)

Afternoon

c)

Noon

d)

Morning

49.

What are the hormones responsible for plant growth, promoting auxillary bud growth and apical dominance?

a)

Auxins and Gibberellins

b)

Cytokinins and Gibberellins

c)

Auxins and abscisic acid

d)

Cytokinins and auxins

50.

An ant colony stores food in the summer, defends itself by stinging enemies and invades a competing ant colony and steals larvae and uses them as new workers. What is the term to best describe how this species copes with everyday life?

a)

ecological defeat

b)

ecological habitation

c)

ecological niche

d)

ecological success

51.

Eutrophication which causes the depletion of dissolved oxygen in water results into?

a)

decrease in aquatic plants

b)

abundant sea harvest

c)

decrease in dissolved nutrients

d)

diminished sea harvest

52.

A forest suffered from wildfires and destroys the existing vegetation. However, the soil remained viable. Five years later, trees and bushes are seen flourishing in the forest again. This phenomenon is called ______.

a)

primary ecological succession

b)

secondary ecological succession

c)

tertiary ecological succession

d)

quaternary ecological succession

53.

An example of asexual reproduction is ______.

a)

Pollination

b)

Conception

c)

Fertilization

d)

Grafting

54.

What type of asexual reproduction occurs when a new organism develops from an outgrowth as exemplified by corals?

a)

Fission

b)

Fertilization

c)

Sexual reproduction

d)

Budding

55.

The molecules that contain an organism’s genetic make-up is called ______.

a)

Genetic Membrane

b)

Nucleolus

c)

Nucleic Acid

d)

Allele

56.

These are small hair-like structures that serve as sensory function in eukaryotic cells.

a)

Cilia

b)

Actin Filaments

c)

Centromere

d)

Plasma

57.

What are the thin structures essential for cytokinesis, amoeboid movement and changes in cell shape?

a)

Myosin filaments

b)

Monofilaments

c)

Pseudo filaments

d)

Microfilaments

58.

A human arm, a bat's wing and a seal's flipper are examples of:

a)

Analogous Organs

b)

Homologous Organs

c)

Embryonic Organs

d)

Vestigial Organs

59.

Which organism is an example of fungi?

a)

Algae

b)

Euglenoids

c)

Yeast

d)

Entamoeba

60.

Which organism is classified under Kingdom Fungi?

a)

Red algae

b)

Microsporidia

c)

Diatoms

d)

Streptococcus

61.

What is the unique feature of fungi?

a)

They have combined chitins and glucans in their cell wall.

b)

Some are capable of bioluminescence.

c)

They contain mitochondria.

d)

They contain genetic material.

62.

Which of the following is an example of a useful function for bacteria?

a)

can clean up an oil spill by digesting hydrocarbons

b)

may be used as vectors to introduce proteins

c)

can synthesize new forms of heavy metals

d)

may be pathogenic and cause human disease

63.

Which protist can cause dysentery?

a)

Gorilla beringei

b)

Entamoeba uvax

c)

Streptococcus

d)

Entamoeba histolytica

64.

Dengue is an infectious disease transmitted by an organism classified under which phylum?

a)

Arthropoda

b)

Echinodermata

c)

Mollusca

d)

Cnidaria

65.

What diagnostic test allows microorganism to multiply in a medium under controlled laboratory condition in order to determine the cause of an infectious disease?

a)

Microbial culture

b)

Chest x-ray

c)

Urinalysis

d)

Complete blood count

66.

Which of the following process involves chloroplast?

a)

Conversion of light energy to chemical energy

b)

Formation of reproductive cells

c)

Cell division

d)

Protein synthesis

67.

What is the most likely reason for a desert plant to have a few or no leaves?

a)

To increase photosynthesis.

b)

To decrease transpiration.

c)

To decrease photosynthesis.

d)

To increase transpiration.

68.

What is the term for slowing-down response by the frog’s circulatory system during the cold season?

a)

Cold-blood reaction

b)

Hibernation

c)

Temperature response

d)

Estivation

69.

Of the following, which is an example of physiological adaptation that allows survival among plants or animals?

a)

Frog's powerful hind legs to jump away from predators.

b)

Bright colors of insects pollinated flowers.

c)

Chameleon's ability to change color with its environment.

d)

Walking sticks' unique shape and color.

70.

This demonstrates the feeding connections between all life forms.

a)

biochemical pathway

b)

nutrition cycle

c)

food web

d)

fossil cycle

71.

What is the most significant cause of dwindling biodiversity?

a)

Large plant consumption

b)

Destruction of Habitat

c)

Global warming

d)

Depletion of ozone layer

72.

Which of the following process best explains the evolution of life forms or gradual transformation of species?

a)

Isolation

b)

Natural selection

c)

Genetic drift

d)

New of combination of genes

73.

Which technology can lead to the formation of a new genetic trait?

a)

asexual reproduction

b)

tissue culture

c)

embryo transplant

d)

exposure to radiation

74.

What is the main organ for respiration?

a)

Esophagus

b)

Lungs

c)

Nose

d)

Fallopian Tube

75.

Which of the following is a vitamin?

a)

Insulin

b)

Niacin

c)

Pepsin

d)

Trypsin

76.

In humans, the correct sequence of embryological development is ______.

a)

Fertilization, zygote, gametes, cleavage, embryo

b)

Gametes, fertilization, zygote, cleavage, embryo

c)

Embryo, zygote, fertilization, gametes, cleavage

d)

Zygote, cleavage, fertilization, embryo, gametes

77.

The main source of energy of our body is ______, derived from carbohydrates like bread and rice.

a)

glucose

b)

amino acid

c)

nucleic acid

d)

glycerol

78.

A substance that speeds up or retards a chemical reaction without itself undergoing a chemical change.

a)

Enhancer

b)

Catalyst

c)

Electrolytes

d)

Ionizer

79.

The main difference between animal and plant cells is that ______.

a)

Plant cells lack rigid cell wall

b)

Animal cells lack rigid cell wall

c)

Plant cells possess small vacuoles

d)

Animal cells possess large vacuoles

80.

Which of the following refers to the increase in earth’s temperature due to a buildup of certain gases in the atmosphere?

a)

global warming

b)

desertification

c)

eutrophication

d)

acid rain

81.

The correct sequence of the stages of mitosis

a)

Prophase-Metaphase-Anaphase-Telophase

b)

Anaphase-Metaphase-Prophase-Telophase

c)

Telophase-Prophase-Metaphase-Anaphase

d)

Metaphase-Telophase-Anaphase-Prophase

82.

Rickets, which is characterized by soft and fragile bones in children, results from severe deficiency of ______.

a)

Vitamin A

b)

Vitamin B

c)

Vitamin C

d)

Vitamin D

83.

Which of the following is the correct sequence of the level of organization from lowest to highest?

a)

Tissues-system-organs-cells

b)

Systems-organs-tissues-cells

c)

Cells-tissues-organs-system

d)

Cells-organs-tissues-system

84.

What are the breathing organs of plants that are located in the stems and trunks?

a)

Lamella

b)

Stoma

c)

Lenticles

d)

Cortex

85.

A severed portion of a starfish grows into a full starfish through asexual reproduction by the process called ______.

a)

Biotic

b)

Regeneration

c)

Migration

d)

Population

86.

The feeding procedure wherein the mother bird partially digests the food and places an amount into the young’s beak is termed ______.

a)

regurgitation

b)

guttation

c)

hibernation

d)

estivation

87.

The average blood in the circulatory system of an average person.

a)

4 liters

b)

5 liters

c)

6 liters

d)

9 liters

88.

Studies show that there are parts of the body that have lost their usefulness and which may later disappear. What are these organs called?

a)

Residual

b)

Extinct

c)

Fossilized

d)

Vestigial

89.

Is the hierarchical series of organism wherein each is dependent on the next as a source of food.

a)

Ecosystem

b)

Ecology

c)

Food chain

d)

Food system

90.

The protein shell of a virus is called ______.

a)

Nucleolus

b)

Capsid

c)

Nucleus

d)

Nucleic Acid

91.

What technology technique is employed during breeding in captivity in order to restore the populations of endangered and threatened species to safe levels?

a)

Artificial insemination

b)

Cobalt radiation

c)

Cross pollination

d)

Genetic engineering

92.

A species of fish lived in a lake. When a dam was constructed in the area a group of fish was separated and populated a new pond. They then developed differing characteristics and became a distinct species. Which of the following concepts explain this speciation?

a)

Geographical isolation

b)

Episodic isolation

c)

Chronotropic isolation

d)

Behavioral isolation

93.

Polysaccharides, triglycerides, polypeptides and nucleic acids are classified as ______.

a)

Acids and bases

b)

Macromolecules

c)

Phospholipids

d)

Carbohydrates

94.

What will happen to the plant cell in a hypotonic solution?

a)

The plant cell will shrink.

b)

The plant cell will have thickened wall.

c)

The plant cell will swell.

d)

Nothing happens to the plant cell.

95.

Which of the following activities is NOT directly involved in the study of biology?

a)

Classifying wild plants living in a forest.

b)

Studying the physical structure of the soil.

c)

Determining which plants grow best in a type of soil.

96.

What term is used to describe the ability to maintain a constant internal environment?

a)

Homeostasis

b)

Metastasis

c)

Metabolism

d)

Thermoregulation

97.

Which of the following is an example of behavioral adaption?

a)

Thick green stems of the cactus.

b)

Thick fur of the bear.

c)

Shedding leaves during summer.

d)

Presence of cuticle on the upper surface of the leaves.

98.

The cell wall of plant is made of?

a)

Lipids

b)

Cellulose

c)

Glycocalyx

d)

Chitin

99.

Which causes our bones to turn brittle and easily break?

a)

Turning into muscle tissue.

b)

Increase in flexibility.

c)

Turbidity decrease.

d)

Removal of collagen.

100.

Dan is 30 years old. According to human structure how many bones he has?

a)

281

b)

217

c)

206

d)

106

101.

What do you call the finger-like folds on the inner linings of the small intestine?

a)

Appendix

b)

Rugae

c)

Villi

d)

Cecum

102.

What do you call a food in a semi liquid form, partially digested and mixed with hydrochloric acid?

a)

Chyme

b)

Mucosa

c)

Gastric fluid

d)

Gastric secretion

103.

The Brundtland Commission defines it as “development that meets the needs of the present without compromising the ability of future generations to meet their own needs.”

a)

Uncompromising

b)

Sustainable development

c)

Ecological

d)

Environmental development

104.

Which of the environment law requires industries to install anti-pollution devices and ban the use of incinerators?

a)

Clean Air Act

b)

Environmental Security Act

c)

Greenpeace Act

d)

Anti-Act

105.

Which protist causes malaria and carried by Anopheles mosquitoes?

a)

Euglena

b)

Plasmodium

c)

Fungi

d)

HIV

106.

The process by which water molecules move from higher to lower areas of concentration through a semi-permeable membrane.

a)

Carrier Molecule

b)

Exocytosis

c)

Osmosis

d)

Cell Membrane

107.

Vibrio cholerae is ______ bacteria.

a)

Comma-shaped

b)

Rod-shaped

c)

Sperical shaped

d)

Spirally-shaped

108.

The technology that uses plants to breakdown or concentrate toxic waste in the soil is called as;

a)

Bioaccumulation

b)

Bioremediation

c)

Genetic engineering

d)

Phytoremediation

109.

Which of the following pertains to slight quantifiable evolutionary modifications within a population from generation to generation?

a)

Microevolution

b)

Artificial selection

c)

Generational selection

d)

Evolutionary upheaval

110.

Chemical change in matter usually happens when ______.

a)

The change in substance keeps its chemical identity.

b)

New substances are formed from the original substance.

c)

Nuclear composition of an atom increases or decreases.

d)

An atom has same atomic mass but different atomic number.

111.

When walking, you push against the ground; the ground pushes back to you is an application of the ______.

a)

Law of Interaction

b)

Law of Inertia

c)

Law of Acceleration

d)

Law of Thermodynamics

112.

Which layer of the atmosphere is closest to the earth’s surface?

a)

stratosphere

b)

exosphere

c)

troposphere

d)

ionosphere

113.

The history of the Earth has been divided by scientists into eras. Which of the following shows the arrangement of these eras into proper sequence from the oldest to the most recent?

a)

Precambrian, Paleozoic, Mesozoic, Cenozoic

b)

Cenozoic, Mesozoic, Paleozoic, Precambrian

c)

Precambrian, Mesozoic, Cenozoic, Paleozoic

d)

Precambrian, Mesozoic, Cenozoic, Paleozoic

114.

Because it will adversely affect the populations' food supplies, the most disadvantageous source of energy is ______.

a)

Wind

b)

Geothermal

c)

Sun

d)

Plants

115.

The world's largest ecosystem of deserts is

a)

Antarctica

b)

Sahara

c)

Kalahari

d)

Gobi

116.

Which of the following is measure of pressure, defined as one newton per square meter?

a)

Lightyears

b)

Milliliter

c)

Joule

d)

Pascal

117.

Perfumes contain organic compounds called:

a)

Alcohol

b)

Ethers

c)

Acids

d)

Esters

118.

Milk is classified as ______.

a)

Colloid

b)

Acid

c)

Metalloid

d)

Soda

119.

How many phases of the moon are there in one month?

a)

4

b)

8

c)

6

d)

10

120.

Which of the following travels fastest in air?

a)

Moonbeam

b)

Light

c)

Thunder

d)

Current

121.

Light travel fastest in ______.

a)

Water

b)

Air

c)

Liquid

d)

Vacuum

122.

Which of the following has the smallest mass when measured in an equal arm balance?

a)

1/2 sheet of pad paper

b)

1/4 sheet of pad paper

c)

1/8 sheet of pad paper

d)

1/3 sheet of pad paper

123.

Which of the following is the CORRECT name for the compound MnF3?

a)

Manganese fluoride (III)

b)

Manganese (I) fluoride (III)

c)

Manganese (III) fluoride

d)

Manganese (III) fluoride (III)

124.

Which of the following statements best explain why copper is the metal most widely used in electrical wiring?

a)

It is the best conductor of electricity.

b)

It is cheaper than aluminum.

c)

It is a better conductor than aluminum and cheaper than silver.

d)

It has high resistance to electricity.

125.

When you carry a heavy load with one arm, you tend to hold your free hand away from your body in order to ______.

a)

change the weight of your body and load.

b)

change the mass of your body.

c)

be ready to grab something in case you fall.

d)

change the center of gravity of your body and load.

126.

Which explains why work is done when blowing a balloon?

a)

The balloon moves outward as the blowing force is exerted on it.

b)

The force of gravity on the balloon increases.

c)

The balloon has potential energy which is changed to kinetic energy.

d)

The balloon is filled with air which has weight and occupies space.

127.

Apparently, the loss of weight of objects immersed in a fluid is due to ______.

a)

Archimedes principle

b)

Newton's theory

c)

Specific gravity

d)

Buoyant force

128.

Which process occurs when dry ice CO2(s) is changed into CO2(g)?

a)

evaporation

b)

sublimation

c)

condensation

d)

decomposition

129.

How are bats able to navigate in the dark without bumping into anything?

a)

They emit sound waves whose returning vibrations can detect the presence of objects.

b)

They are able to fluoresce in the dark.

c)

They have supersonic eyesight.

d)

They can disappear.

130.

The source of water pollution is when water from a river is mixed with the contents of a septic tank, this is called

a)

Water condensation

b)

Hypertrophication

c)

Estivation

d)

none of the above

131.

Which element has Ca as its symbol?

a)

Calcium

b)

Cadmium

c)

Carbon

d)

Californium

132.

Which of the following human activities reduces the level of ozone in the atmosphere?

a)

Using large banks of solar cells for energy production.

b)

Using artificial lighting in scientific polar stations.

c)

Releasing of fluorocarbons from aerosol cans.

133.

Air like food and water is an essential element in human existence. Carried by the wind, polluted air called falls to earth poisoning fish and destroying vegetation.

a)

El Niño

b)

La Niña

c)

Greenhouse rain

d)

Acid rain

134.

The Kyoto protocol which requires countries to reduce greenhouse emission is a practice that advocates ______.

a)

Sustainable potential

b)

Ecological destruction

c)

Forest demolition

d)

Environmental protection

135.

Besides solids, liquids, and gas, what is the fourth form of matter?

a)

Gel

b)

Colloid

c)

Foam

d)

Plasma

136.

Which of these characterizes organic compounds?

a)

They are compounds of any element.

b)

They cannot be broken down to simpler substances.

c)

They always require electrical means to separate.

d)

They are compounds containing hydrocarbon.

137.

Which type of reaction does the general equation (AB + energy → A + B) shows?

a)

Endothermic synthesis

b)

Exothermic decomposition

c)

Exothermic synthesis

d)

Endothermic decomposition

138.

Which element has Te as its symbol?

a)

Terbium

b)

Tellurium

c)

Titanium

d)

Technetium

139.

What is the maximum number of electrons that can occupy a p orbital?

a)

6

b)

10

c)

18

d)

14

140.

A toothpick can sit on the surface of water due to ______.

a)

surface tension

b)

buoyancy

c)

viscosity

d)

atmospheric pressure

141.

Which of the following statement is TRUE of nuclear fission?

a)

The energy process is identical to that which occurs in the sun.

b)

Energy is obtained by getting nucleus of the atoms to break up to split.

c)

After the lighter atoms are changed into energy.

d)

Scientists can combine lighter atoms to form heavier atoms.

142.

Which of the following statements is TRUE about textbook laid on the table?

a)

No force is acting on it.

b)

The textbook undergoes acceleration.

c)

The sum of the forces acting upon it is zero.

d)

The textbook undergoes deceleration.

143.

Which of the following causes the seasons?

a)

The rotation of the sun about the earth.

b)

The distance of the earth from the sun.

c)

The rotation of the earth about the sun.

d)

The tilting of the earth on its axis.

144.

Which is true of metalloids?

a)

Conduct heat and electricity less effectively than non-metal.

b)

Conduct heat and electricity better than metals.

c)

Conduct heat better than metals.

d)

Have properties of both metals and non-metals.

145.

In a flame test, the presence of boron in a solution is evident by what color of flame?

a)

Bright green

b)

Gold

c)

Brick red

d)

Lilac

146.

A metric carat is a unit of mass for measuring gemstones. It is equivalent to ______.

a)

1,000 mg

b)

2 kg

c)

200 mg

d)

100 mg

147.

When the North Pole is tilted towards the sun, it is summer and when the sun shines all the time both day and night, what is this called?

a)

Twilight sun

b)

Northern Light

c)

Summer light

d)

Midnight Sun

148.

What is the most common protic solvent?

a)

water

b)

acetone

c)

ethyl acetate

d)

crown ethers

149.

Which of the following processes includes all the others?

a)

Osmosis

b)

Diffusion

c)

Facilitated diffusion

d)

Passive transport

150.

What is the process by which the water molecules move from an area of higher concentration to areas of lower concentration through a semi-permeable membrane?

a)

Osmosis

b)

Diffusion

c)

Endocytosis

d)

Exocytosis