NLN Pax Science practice tests
A person blows his breath into a straw that is placed in limewater. The limewater becomes cloudy because the person's
... [Show More] breath contains: ans: carbon dioxide
A person who was in an auto accident has formed a blood clot at the site of the injury. One event that can lead to formation of a blood clot is that: ans: ruptured platelets release thromboplastin
A student focuses sunlight to a point with a thin converging (convex) lens. Which of these direct measurements can the student make as a result of this experiment? ans: the approximate focal length of the lens
In ecological succession, the first living thing to colonize a hitherto barren area is called a: ans: pioneer organism
Unicellular organisms that have a nucleus and can swim with the aid of cilia are examples of: ans: protozoans
Which of these conditions is associated with smoking? ans: emphysema
Which of these quantities is most closely associated with an object's inertia? ans: Mass
Which of these sequences of anatomic organization, from the simplest level to the most complex, is the correct sequence? ans: From tissue, organ, organ system to organism
Which part of the cell structure controls the passage of materials into and out of the cell? ans: Plasma membrane
While working in the chemistry laboratory, a student spills dilute hydrochloric acid on her hand. What is the first action this student should take? ans: Flush her hand with large quantities of water
Within a living cell, the oxygen (O2) from a mixture of O2 and carbon dioxide (CO2) is used up. This creates a concentration gradient across the cell membrane, drawing O2 across the membrane from the outside in, a process known as ans: Diffusion
You cut your finger rather deeply while slicing an apple. Which of these actions should you take first? ans: Wash the wound continuously with cold running water
30 students in a class carefully measure the length and width of 20 peanut shells. They also count the number and note the size of the peanuts inside. This information is recorded on various graphs showing the numbers of nuts and the different sizes. The collected evidence of the peanuts gives the students an idea of the extent of: ans: variation within a species
A *tincture* is a solution in which: ans: alcohol is the solvent
All the glucose filtered from the blood in the glomerulus into the Bowman's capsule of the kidney nephron is returned to the tissue fluid while passing along the proximal tubule. This rapid return is effected by the process of: ans: active transport
If the night temperature drops 50 degrees, the roadrunner's internal energy-conservation permits a lowering of body temperature to: ans: 94°F
1 kilogram (kg) of solid X at 10C and 1 kg of solid Y 10C each absorb 5 joules of heat energy. The final temperatures on X and Y is 15C and 20C, respectively. Compared to X, Y must have a lower:F ans: specific heat
A woman suddenly chokes on a piece of food and clutches frantically at her throat. An immediate remedy is to: ans: apply quick, hard pressures successively to her abdomen, just below her diaphragm
An unknown gas is more dense than air, does not support combustion, and turns a limewater solution cloudy. This gas is most probably: ans: carbon dioxide
Night blindness in humans is caused by a lack of: ans: Vitamin A
In varieties of matter, the term heterogeneous may be applied to: ans: mixtures, but not elements or compounds
The atoms of an element with seven valence electrons are most probably classified as: ans: nonmetals
The inherited factors that are transmitted in a organism from generation to generation are called its: ans: genotype
Which of these conditions is associated with smoking? ans: Emphysema
Within which of these structures of the female reproductive tract is the human egg fertilized? ans: Fallopian tube
A cell which manufactures a large amount of protein for export would have an abundance of organelles called: ans: ribosomes
A lens that focuses distant light to a single point is known as a : ans: converging (convex) lens
A substance composed of similar atoms (number of protons is the same for all) that can not be broken down chemically is a(n) ans: element
Charles Darwin's theory of evolution suggests that the reason for the various differences between species is a result of: ans: natural selection
How much current is drawn by a light bulb that has a resistance of 100 R with a voltage of 110 V? (V= IR) ans: 1.1 amperes
The amplitude of a sound wave is most closely related to its: ans: loudness
The calorie and the kilocalorie are units of : ans: energy
The force of gravity on an object is that object's: ans: weight
The Law of Dominance was proposed by which of the following scientists? ans: Mendel
The number of complete waves which pass a point in one second is known as a : ans: frequency
The vertical columns on the periodic chart are known as: ans: groups
When a sperm and egg join to form a zygote in humans, what determines the sex of the child that is produced? ans: The sperm
When two atoms *share* a pair of electrons, the bond between them is called: ans: covalent
When your muscles atrophy, they: ans: waste away
Which of these organisms has the most complex digestive system? ans: Earthworm
Which of these processes occurs at a neuromuscular junction? ans: Impulse transmission
Which of these processes is used to free contaminated water of bacteria? ans: Treating it with chlorine
Which of these organisms might be found in contaminated well water? ans: Giardia
Which of these is the correct sequence of chambers through which blood flows in the human heart and lungs? ans: Right atrium, right ventricle, lungs, left atrium, left ventricle
Which of these changes occurs in the kidneys when a person becomes dehydrated? ans: The filtration rate of water remains constant and the reabsorption of water increases.
When a population is in Hardy-Weinberg equilibrium, which of these conditions must be present? ans: The population is isolated from other populations
Water freezes at 0C. On the Kelvin temperature scale, this is equivalent to: ans: 273K
To determine the optimum conditions for the activity of a digestive enzyme, it would be necessary to test its activity over a range of: ans: temperature, pH and substrate concentration
The Pap test can detect cancer in the female reproductive tract at an early stage, requiring cells scraped from: ans: the cervix
The most probable area of study that would show the prevalence of mental illness in mid- Manhattan is that: ans: epidemiology
The meiotic division of cells leads to the production of cells that: ans: contain half the usual number of chromosomes
The full set of genes in an individual is known as: ans: the human genome
The boiling point of liquid nitrogen at one atmosphere pressure is 77 K. This temperature us equivalent to: ans: neg196C
77K - 273K= 196C
Substance Y is soluble only in nonpolar solvents and does not conduct electricity, either in the solid or liquid phases. Y is most probably ans: a nonpolar substance
Muscles are attached to bone by which of these structures? ans: Tendon
Coulomb's law is most closely associated with ans: electric charges
At room temperature, which of these substances exists as diatomic molecules? ans: Oxygen
Amnesia in humans is a loss of memory. Which of these parts of the brain has been affected when someone is suffering from amnesia caused by head trauma? ans: Cerebral cortex
A magician rapidly pulls a tablecloth from a table, leaving the dishes undisturbed. Which of these principles of physics explains this "trick"? ans: Objects at rest tend to remain at rest.
Which of these temperatures is known as Absolute Zero? ans: 0 K
Which of these substances contains a nonpolar covalent bond? ans: O2
Which of these single instruments may be used to measure the current flowing through a circuit? ans: An ammeter
Which of these processes is responsible for the recorded production of CO2 by yeast cells from sugar solution? ans: Anaerobic respiration
Which of these particles can only be found in the nucleus of an atom? ans: protons and neutrons
Which of these pairs of units measures the same quantity
? ans: Calorie and joule
Which of these organisms use nitrogen directly from the air? ans: Blue-green algae
Which of these equations best illustrates a synthesis reaction? ans: 2Na + Cl2 -> 2NaCl
The organ that filters metabolic waste from the blood is the ans: kidney
Periodontitis is an inflammatory condition of the ans: gum tissue that surrounds the neck of each tooth
Iodized salt is used to prevent a human condition known as ans: goiter
Heat energy is absorbed in which of these phase changes? ans: Br2(l) -> Br2(g) [Show Less]