Praxis Test Exam 2026 Questions and
Answers
Option (C) is correct. For any marked measuring device, one place beyond the
numerical place of the marking is estimated, and this determines the correct
number of significant figures. If the thermometer is marked to 0.1°Czero point one
degrees Celsius, the hundredth place should be estimated and the temperature
recorded as 22.44°C22 point four four degrees Celsius. - Correct answer-A
thermometer inserted into a solution has a mercury level of just a bit less than
halfway between the markings for 22.4ºC22 point 4 degrees Celsius and 22.5ºC22
point 5 degrees Celsius. To represent the correct number of significant figures, the
temperature of the solution should be recorded as:
a. 22
b. 22.4
c. 22.44
d. 22.5
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,Option (B) is correct. Ernest Rutherford published results of his gold foil
experiment in 1911. A beam of alpha particles was directed at a thin sheet of gold
foil. Most of the particles passed through the foil, but some were reflected or
deflected, providing experimental evidence that the atom has a relatively small
nucleus that contains most of the mass of the atom. - Correct answer-Experimental
evidence supports the fact that most of the mass of an atom is contained in which
of the following?
a. The electron cloud
b. The nucleus
c. The sublevels
d. The valence level
Option (C) is correct. In order to draw a valid conclusion about the effect of water
on seed germination, the student should have included a control experiment, a
second dish with a dry paper towel, in the investigation. The only experimental
variable should be the presence or absence of water. The control variables, light
and temperature, should be the same for both dishes. - Correct answer-A student
placed 20 radish seeds on a damp paper towel in a petri dish and placed the dish
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,under a fluorescent light. After 48 hours, all the seeds had germinated. In order for
the student to draw a valid conclusion about the effect of water on seed
germination, which of the following should also have been included in the
investigation?
a. A second dish should have been placed in the dark.
b. A second dish should have been placed in a refrigerator.
c. A second dish with a dry, rather than damp, paper towel should have been used.
d. A second dish with a dry, rather than damp, paper towel should have been placed
in direct sunlight on a windowsill.
Option (A) is correct. The concentration of the solution that results from adding
250 mL of 2.0 M HCl250 milliliters of 2 point zero molar H C l to 750 mL750
milliliters of water is 0.50 Mzero point five zero molar. In 250 mL of 2.0 M
HCl250 milliliters - Correct answer-Which of the following will result in a solution
of 0.50 M HClzero point five zero molar H C l ?
250 mL250 milliliters of 2.0 M HCl2 point zero molar H C l added to 750 mL
H2OA: 750 milliliters H 2 O
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, 500 mL500 milliliters of 1.0 M HClone point zero molar H C l added to 1,000 mL
H2OB: 1,000 milliliters H 2 O
100 mL of 0.50 M HCl100 milliliters of zero point five zero molar H C l added to
900 mL H2OC: 900 milliliters H 2 O
200 mL of 0.10 M HCl200 milliliters of zero point one zero molar H C l added to
1,000 mL H2OD: 1,000 milliliters H 2 O
Option (A) is correct. The diaphragm is a rotating disk under the stage that is used
to control the intensity and size of the cone of light directed upward to the slide. -
Correct answer-Which of the following parts of a compound microscope would be
used to regulate the amount of light transmitted through the specimen on a slide?
Diaphragm
Nosepiece
Fine adjustment knob
Coarse adjustment knob
Option (C) is correct. In 1609, Johannes Kepler published what is now known as
Kepler's first law of planetary motion. Kepler, a mathematician, asserted that
observations of the movements of Mars were consistent with the planet having an
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Answers
Option (C) is correct. For any marked measuring device, one place beyond the
numerical place of the marking is estimated, and this determines the correct
number of significant figures. If the thermometer is marked to 0.1°Czero point one
degrees Celsius, the hundredth place should be estimated and the temperature
recorded as 22.44°C22 point four four degrees Celsius. - Correct answer-A
thermometer inserted into a solution has a mercury level of just a bit less than
halfway between the markings for 22.4ºC22 point 4 degrees Celsius and 22.5ºC22
point 5 degrees Celsius. To represent the correct number of significant figures, the
temperature of the solution should be recorded as:
a. 22
b. 22.4
c. 22.44
d. 22.5
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,Option (B) is correct. Ernest Rutherford published results of his gold foil
experiment in 1911. A beam of alpha particles was directed at a thin sheet of gold
foil. Most of the particles passed through the foil, but some were reflected or
deflected, providing experimental evidence that the atom has a relatively small
nucleus that contains most of the mass of the atom. - Correct answer-Experimental
evidence supports the fact that most of the mass of an atom is contained in which
of the following?
a. The electron cloud
b. The nucleus
c. The sublevels
d. The valence level
Option (C) is correct. In order to draw a valid conclusion about the effect of water
on seed germination, the student should have included a control experiment, a
second dish with a dry paper towel, in the investigation. The only experimental
variable should be the presence or absence of water. The control variables, light
and temperature, should be the same for both dishes. - Correct answer-A student
placed 20 radish seeds on a damp paper towel in a petri dish and placed the dish
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,under a fluorescent light. After 48 hours, all the seeds had germinated. In order for
the student to draw a valid conclusion about the effect of water on seed
germination, which of the following should also have been included in the
investigation?
a. A second dish should have been placed in the dark.
b. A second dish should have been placed in a refrigerator.
c. A second dish with a dry, rather than damp, paper towel should have been used.
d. A second dish with a dry, rather than damp, paper towel should have been placed
in direct sunlight on a windowsill.
Option (A) is correct. The concentration of the solution that results from adding
250 mL of 2.0 M HCl250 milliliters of 2 point zero molar H C l to 750 mL750
milliliters of water is 0.50 Mzero point five zero molar. In 250 mL of 2.0 M
HCl250 milliliters - Correct answer-Which of the following will result in a solution
of 0.50 M HClzero point five zero molar H C l ?
250 mL250 milliliters of 2.0 M HCl2 point zero molar H C l added to 750 mL
H2OA: 750 milliliters H 2 O
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
, 500 mL500 milliliters of 1.0 M HClone point zero molar H C l added to 1,000 mL
H2OB: 1,000 milliliters H 2 O
100 mL of 0.50 M HCl100 milliliters of zero point five zero molar H C l added to
900 mL H2OC: 900 milliliters H 2 O
200 mL of 0.10 M HCl200 milliliters of zero point one zero molar H C l added to
1,000 mL H2OD: 1,000 milliliters H 2 O
Option (A) is correct. The diaphragm is a rotating disk under the stage that is used
to control the intensity and size of the cone of light directed upward to the slide. -
Correct answer-Which of the following parts of a compound microscope would be
used to regulate the amount of light transmitted through the specimen on a slide?
Diaphragm
Nosepiece
Fine adjustment knob
Coarse adjustment knob
Option (C) is correct. In 1609, Johannes Kepler published what is now known as
Kepler's first law of planetary motion. Kepler, a mathematician, asserted that
observations of the movements of Mars were consistent with the planet having an
©COPYRIGHT 2025, ALL RIGHTS RESERVED 4
