PAX NLN Exam (Science) Practice
Questions & Answers 2024/2025
A person blows his breath into a straw that is placed in limewater. The limewater becomes cloudy
because the person's breath contains: - ANSWERScarbon 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: - ANSWERSruptured 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? - ANSWERSthe approximate focal
length of the lens
In ecological succession, the first living thing to colonize a hitherto barren area is called a: -
ANSWERSpioneer organism
Unicellular organisms that have a nucleus and can swim with the aid of cilia are examples of: -
ANSWERSprotozoans
Which of these conditions is associated with smoking? - ANSWERSemphysema
Which of these quantities is most closely associated with an object's inertia? - ANSWERSMass
Which of these sequences of anatomic organization, from the simplest level to the most complex, is the
correct sequence? - ANSWERSFrom tissue, organ, organ system to organism
Which part of the cell structure controls the passage of materials into and out of the cell? -
ANSWERSPlasma 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? - ANSWERSFlush 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 - ANSWERSDiffusion
You cut your finger rather deeply while slicing an apple. Which of these actions should you take first? -
ANSWERSWash 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: - ANSWERSvariation within a species
A *tincture* is a solution in which: - ANSWERSalcohol 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: - ANSWERSactive transport
If the night temperature drops 50 degrees, the roadrunner's internal energy-conservation permits a
lowering of body temperature to: - ANSWERS94°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 -
ANSWERSspecific heat
A woman suddenly chokes on a piece of food and clutches frantically at her throat. An immediate
remedy is to: - ANSWERSapply 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: - ANSWERScarbon dioxide
Questions & Answers 2024/2025
A person blows his breath into a straw that is placed in limewater. The limewater becomes cloudy
because the person's breath contains: - ANSWERScarbon 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: - ANSWERSruptured 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? - ANSWERSthe approximate focal
length of the lens
In ecological succession, the first living thing to colonize a hitherto barren area is called a: -
ANSWERSpioneer organism
Unicellular organisms that have a nucleus and can swim with the aid of cilia are examples of: -
ANSWERSprotozoans
Which of these conditions is associated with smoking? - ANSWERSemphysema
Which of these quantities is most closely associated with an object's inertia? - ANSWERSMass
Which of these sequences of anatomic organization, from the simplest level to the most complex, is the
correct sequence? - ANSWERSFrom tissue, organ, organ system to organism
Which part of the cell structure controls the passage of materials into and out of the cell? -
ANSWERSPlasma 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? - ANSWERSFlush 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 - ANSWERSDiffusion
You cut your finger rather deeply while slicing an apple. Which of these actions should you take first? -
ANSWERSWash 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: - ANSWERSvariation within a species
A *tincture* is a solution in which: - ANSWERSalcohol 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: - ANSWERSactive transport
If the night temperature drops 50 degrees, the roadrunner's internal energy-conservation permits a
lowering of body temperature to: - ANSWERS94°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 -
ANSWERSspecific heat
A woman suddenly chokes on a piece of food and clutches frantically at her throat. An immediate
remedy is to: - ANSWERSapply 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: - ANSWERScarbon dioxide
