GENERAL SCIENCE (DOST REVIEWER)

Question 1

According to Newton’s third law of motion, the strength of a reaction force is ____________________ the strength of the action force.

Answer 1

Equal to

Question 2

What is the curved path that an object follows when thrown or launched near the surface of the Earth?

Answer 2

Projectile Motion

Question 3

A skydiver with a mass of 70 kg accelerates to Earth at a rate of 9.8 m/s2 due to gravity. What is the force on the skydiver?

Answer 3

686 Newtons

Question 4

The hardest form of carbon is?

Answer 4

Diamond

Question 5

Emma believes viruses are not living organisms while Kayla believes viruses are living organisms. Who is correct and why?

Answer 5

Emma, because viruses cannot reproduce on their own.

Question 6

A solid formed by the chemical reaction of some solutions is a

Answer 6

Precipitate

Question 7

You are at the Kennedy Space Center, sitting in your rocket, ready to launch. You look out the window and view the sky. You are currently sitting at the lowest level of the atmosphere. What is this level called?

Answer 7

Troposphere

Question 8

What is the greenhouse effect?

Answer 8

The warming of a planet due to trapped radiation.

Question 9

The existence of microorganisms in the human gastric system is an example of

Answer 9

Mutualism

Question 9

The gravitational force with which the sun attracts the earth:

Answer 9

is same as the force with which the earth attracts the sun.

Question 10

The mass number of a nucleus is:

Answer 10

the sum of the number of protons and neutrons present in the nucleus.

Question 11

A force is a ____________________

Answer 11

push or pull

Question 12

Who formulated the geocentric theory?

Answer 12

Ptolemy

Question 13

In natural selection, one variation which is present in ALL members of a population is a called a -

Answer 13

adaptation

Question 14

Which is/are the important raw material(s) required in cement industry?

Answer 14

Limestone and Clay

Question 15

Isotopes of an element contain same number of:

Answer 15

Protons but different number of neutrons.

Question 15

The thinnest layer of the Earth is?

Answer 15

Crust

Question 16

What is an example of velocity?

Answer 16

20 m/s East

Question 17

Kepler’s second law or the equal area law states that the closer a planet is to the sun the ________ it travels.

Answer 17

Faster

Question 18

Earth rotates in about _______ hours.

Answer 18

24

Question 19

When two mercury drops are brought into contact, they merge to a bigger drop because liquids have tendency to possess:

Answer 19

Minimum surface area

Question 20

Around what body of water will you find the region known as the Ring of Fire?

Answer 20

Pacific Ocean

Question 20

Any force that causes an object to move in a circle is called a(n)

Answer 20

centripetal force

Question 21

A battery operated DVD player uses 12 volts from AA batteries and draws a current of 3 amperes. What is the resistance?

Answer 21

4 ohms

Question 22

Which layer of Earth has the GREATEST density and is solid?

Answer 22

inner core

Question 23

During summer, we feel comfortable under a fan because it:

Answer 23

Set the air in motion, thereby increasing the evaporation of sweat.

Question 24

Distillation is the process of separating liquids by using _____.

Answer 24

evaporation and condensation

Question 25

Vitamin D can be obtained from _______________.

Answer 25

Sunlight

Question 26

What is an example of a homozygous dominant genotype?

Answer 26

BB

Question 27

The lithosphere combines what two layers?

Answer 27

Crust & Upper Mantel

Question 27

Ptyalin is an enzyme produced in the:

Answer 27

Pancreas

Question 28

Optic fibers are mainly used for which of the following?

Answer 28

Communication

Question 29

One should not connect a number of electrical appliances to the same power socket because:

Answer 29

this can damage the domestic wiring due to overloading.

Question 30

Which two substances can be mixed together to form a new substance through a chemical reaction?

Answer 30

Baking soda and vinegar

Question 31

Scientists once thought that the continents had formed in their current locations. Alfred Wegener first published this theory of continental drift in 1915. Which of the following provides evidence for continental drift?

Answer 31

Africa North America and South America fit together like puzzle pieces.

Question 32

The Earth’s diameter is approximately how many kilometers?

Answer 32

12,756

Question 33

The universal law of gravitation was propounded by:

Answer 33

Isaac Newton

Question 34

Sound of frequency below 20 Hz is called:

Answer 34

infrasonic

Question 35

What happens when two forces act in the same direction?

Answer 35

Their strengths are added

Question 36

Fill in the blanks: Proteins are made of different ____________ which are arranged in different orders, or _________________.

Answer 36

amino acids, sequences

Question 37

A student mixes apple juice, water, and cinnamon together. Did a chemical reaction occur?

Answer 37

No, because the properties stayed the same.

Question 37

In animals, sexual reproduction depends on the production of gametes. Which of the following processes produces gametes in animals?

Answer 37

Meiosis

Question 38

Carbon dioxide is called a greenhouse gas because:

Answer 38

It absorbs infrared radiation.

Question 39

The flower of a plant is involved in reproduction. Which parts are male and which are female?

Answer 39

Male: stamen; female: pistil

Question 40

Natural radioactivity was discovered by:

Answer 40

Henri Becquerel

Question 41

What is the name of the solid that forms after some solutions react chemically?

Answer 41

Precipitate