STEM QUALIFYING EXAM
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- Q1
Which of the following statement is not true about atoms?
Atoms are very small particles that make up an element.
Atoms of a particular element are alike in size, mass and structure.
Atoms of different elements differ in size, mass, and structure.
Atoms can be divided during an ordinary chemical reaction
120sEditDelete - Q2
It has no definite shape and no definite volume. It takes the shape of its container and its volume is sensitive to changes in temperature and pressure of its container. So its compressibility is very high.
Solid
Plasma
Liquid
Gas
120sEditDelete - Q3
Employs repeated or continuous distillation; components are collected in fractions. Liquid mixtures with mutually soluble or miscible components and components have different boiling points.
Fractional Distillation
Centrifugation
Flotation
Filtration
120sEditDelete - Q4
Which elements have an octet in their ground state?
Period 7
Group 1A
Group 8A
Period1
120sEditDelete - Q5
Used in cooling ice cream (as dry ice) and additive in fire extinguisher.
N2O
CO2
SO2
Cl2
120sEditDelete - Q6
The statement that is not a principle of the cell theory is ________________.
All matter consists of at least one cell.
Cells are the basic unit of life.
All organisms are made of one or more cells
All cells arise from pre-existing cells.
120sEditDelete - Q7
The cell organelle that digests molecules, old organelles, and foreign substances is the ____________.
Chloroplast
Golgi apparatus
Mitochondrion
Lysosome
120sEditDelete - Q8
If the chloroplasts of a plant cell are damaged, which will it be unable to do?
Excrete waste materials
Give instruction for the cell to reproduce
Make food for the cell
Protect the cell
120sEditDelete - Q9
Which of the following is not true about meiosis?
the genetic diversity it produces among sexual organisms can help make a species population more unstable by producing a wider variety of traits for the process of natural selection to act upon.
It restricts the multiplication of chromosome number and maintains the stabilityof the species.
It maintains the same chromosome number in the sexually reproducing organisms.
Meiosis enables genetic diversity
120sEditDelete - Q10
In what way are photosynthesis and cellular respiration different?
Cellular respiration stores ATP, while photosynthesis releases ATP.
Photosynthesis releases energy, while cellular respiration stores energy.
Cellular respiration produces oxygen, while photosynthesis uses oxygen.
Photosynthesis uses carbon dioxide, while cellular respiration produces carbon dioxide
120sEditDelete - Q11
Why is ATP important to living things?
It helps maintain the fluidity of cell membranes.
It identifies DNA start sequences for transcription.
It aids in protein folding and coiling.
It is used to capture and transfer energy.
120sEditDelete - Q12
In which layer do convection currents occur?
The outer core
The inner core
The mantle
The crust
120sEditDelete - Q13
What is the composition of the lithosphere?
The lower mantle and outer core
The continental and oceanic crust
The lower mantle
The crust and uppermost mantle
120sEditDelete - Q14
The most abundant elements found in the earth’s crust.
Silicon and Aluminum
Iron and Nickel
Hydrogen and Oxygen
Gold and Nickel
120sEditDelete - Q15
Which of the following was not used by Wegener as evidence of continental drift?
Fit of the continents
Magnetic reversals on the sea floor
Evidence of glacial scratches
Fossils that were found on different countries.
120sEditDelete - Q16
What do you call the process of changing food into a simpler substance with the help of enzymes?
Chemical digestion
Mechanical digestion
Mastication
Churning
120sEditDelete - Q17
Which system is responsible for the exchange of oxygen and carbon dioxide between the air and the cells?
Circulatory
Digestive
Excretory
Respiratory
120sEditDelete - Q18
The chemical process in which oxygen and carbon dioxide are exchanged between the outside air and the cells is called ____________.
Breathing
Inhaling
Exhaling
Respiration
120sEditDelete - Q19
A body whose velocity is constant
has a positive acceleration
has a negative acceleration
has a zero acceleration
120sEditDelete - Q20
If an object falls with constant acceleration , the velocity of the object must
Continually change by varying amounts depending on its speed at any point
Be constant also
Continually decrease
Continually change by the same amount each second
120sEditDelete