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PAX Science NLN Exams collection
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PAX Science NLN Exams collection n1. A person blows his breath into a straw that is placed in limewater. The
limewater becomes cloudy because the person's breath contains:
carbon dioxide
2. 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?: The approximate focal length of the lens.
3. A woman suddenly chokes on a piece of food and clutches frantically at
her throat. An immediate remedy is to: apply quick, hard pressures
successively to her abdomen, just beneath her diaphragm.
4.An unknown gas is more dense than air, does not support combustion,
and turns a limewater solution cloudy. This gas is most probably: carbon
dioxide
5. Guard cells which can be found in the leaves of plants are most
closely associated with which of these processes?: Evaporation of
water from the plant.
6. If a red light is passed through a dilute solution of chlorophyll
solution, the spectrophotometer will detect what amount of
transmittance of this light?: 50 - 75%
7. If the medulla of the brain in a human was damaged, which of
these conditions would most likely result?: Difficulty in breathing
8. Night blindness in humans is caused by a lack of: Vitamin A
9. In varieties of matter, the term heterogeneous may be applied to:
mixtures, but not elements or compounds.
10.Heat energy is absorbed in which of these phase changes?: Br2 (l) -
> Br2(g)
11.Periodontitis is an inflammatory condition of the: gum tissue that
sur- rounds the neck of each tooth.
12.The atoms of an element with seven valence electrons are most
probably classified as: nonmetals.
13.The bending of a wave around an obstacle is known as: diffraction
,14.The inherited factors that are transmitted in an organism from
generation to generation are called its: genotype
15.Which of these conditions is associated with smoking?: emphysema
16.Which of these equations best illustrates a synthesis reaction?: 2Na +
Cl2
-> 2NaCl
, 17.Which of these pairs of units measures the same quantity?: Newton
and joule / Newton and watt ?
18.Which of these quantities is a vector quantity?: Force
19.Which of these single instruments may be used to measure the
current flowing through a circuit?: Ammeter
20.Which of these substances contains a nonpolar covalent bond?: O2
21.Which part of the cell structure controls the passage of materials into
and out of the cell?: Plasma membrane.
22.Which part of the human central nervous system controls
voluntary movements?: Cerebrum.
23.While working in the chemistry laboratory, a student spills dilute
hy- drochloric acid on her hand. What is the first action this student
should take?: Flush her hand with large quantities of water.
24.Within which of these structures of the female reproductive tract is
the human egg fertilized?: Fallopian tube.
25.A tincture is a solution in which: alcohol is the solvent.
26.A circuit contains three 3-ohm (W) resistors in series. What is the
equiv- alent resistance of this combination?: 9W
27.A quantity that has both magnitude and direction is called a(n): vector.
28.A recently discovered species has these characteristics: amniotic eggs,
a four-chambered heart, and lightweight, honeycombed bones. Which of
these ADDITIONAL characteristics is likely to be present?: Feathers for
flying.
29.A substance that increases the speed of a reaction by lowering its
acti- vation energy is called: a catalyst
30.An example of an adaptation to prevent water loss in plants is:
waxy epidermis
31.At room temperature, which of these substances exists as
diatomic molecules?: oxygen
32.Compounds with the same type and number of atoms and the same
chemical bonds but different spatial arrangements of these bonds and
atoms are called: structural isomers.
33.The calorie and the kilocalorie are units of: energy
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