ACT SCIENCE REVIEW QUESTIONS AND
ANSWERS NEWEST UPDATED 2025/2026 A
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The correct answer is C, zero. The kinetic energy of an object of mass m
moving at speed v is 1/2mv2. Since the object has the same speed
before and after striking the wall, its kinetic energy does not change. -
CORRECT ANSWERS An object with mass m and speed v0 directed
to the right strikes a wall and rebounds with speed v0 directed to the
left.
The change in the object's kinetic energy is
A. - mv02
B. -1/2mv02
C. Zero
D. 1/2mv02
E. mv02
The correct answer is C, 64.3kg . This question is intended to assess
your knowledge of realistic values for physical quantities as well as an
understanding of experimental error and significant figures. Only 60kg
and 64.3kg are likely masses for an adult human. (If you need to
compare the choices in pounds to see this, 1kg is approximately 2.2
pounds.) When recording measurements, it is assumed that there is
some measurement error in the last digit recorded. For both possible
values for the teacher's weight, 0.5 percent is about 0.3kg. Therefore, a
,ACT SCIENCE REVIEW QUESTIONS AND
ANSWERS NEWEST UPDATED 2025/2026 A
COMPLETE EXAM ALL ANSWERS
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mass recorded to better than this accuracy will indicate tenths of a
kilogram. - CORRECT ANSWERS A teacher measures and records
her own mass to an accuracy of better than 0.5 percent. Which of the
following is most likely the mass that she recorded?
A. 6.43kg
B. 60kg
C. 64.3 kg
D. 600kg
E. 643kg
The correct answer is D, "the time taken to achieve equilibrium after
the copper is dropped into the water." When an amount of heat Q is
transferred to or from a material, its magnitude is given by Q = mc( Tf -
Ti), where m is the mass of the material, c is its specific heat and Tf and
Ti are its final and initial temperature, respectively. As the copper cools,
heat is transferred from it to the water, which gets warmer until both
the copper and water are in equilibrium at the same temperature. By
conservation of energy, the heat transferred from the copper must be
equal to the heat transferred to the water. To determine the specific
heat of copper, the experimenter would set the expression for the heat
,ACT SCIENCE REVIEW QUESTIONS AND
ANSWERS NEWEST UPDATED 2025/2026 A
COMPLETE EXAM ALL ANSWERS
ACCURATE BEST GRADED A+ FOR SUCCESS
transferred from the copper equal to that for the heat transferred to
the water, and solve the equation for the specific heat of copper. Time
does not appear in the expression but the quantities in the other
choices d - CORRECT ANSWERS An experiment is performed to
measure the specific heat of copper. A lump of copper is heated in an
oven, then dropped into a beaker of water. To calculate the specific
heat of copper, the experimenter must know or measure the value of
all of the quantities below EXCEPT the
A. mass of the water
B. original temperatures of the copper and the water
C. final (equilibrium) temperature of the copper and the
water
D. time taken to achieve equilibrium after the copper is
dropped into the water
E specific heat of the water
The correct answer is B, that the internal energy has increased by 4
joules. According to conservation of energy, as expressed by the first
law of thermodynamics, adding 12 joules of heat to an ideal gas would
increase the internal energy of the gas by 12 joules. However, the
internal energy of the gas would decrease by 8 joules if that 8 joules is
, ACT SCIENCE REVIEW QUESTIONS AND
ANSWERS NEWEST UPDATED 2025/2026 A
COMPLETE EXAM ALL ANSWERS
ACCURATE BEST GRADED A+ FOR SUCCESS
converted to work done by the gas. So the net change in the internal
energy of the gas is 12 joules - 8 joules, which is a net increase of 4
joules. - CORRECT ANSWERS In a given process, 12 joules of heat is
added to an ideal gas and the gas does 8 joules of work. Which of the
following is true about the internal energy of the gas during this
process?
A. It is increased by 20 joules
B. It is increased be 4 joules
C It is not changed
D. It has decreased by 4 joules
E It has decreased by 20joules
The correct answer is that the field lines form circles around the wire.
This is a fundamental characteristic of magnetic fields produced by
currents. - CORRECT ANSWERS Which of the following is true of the
magnetic field produced by a current in a long, straight wire?
A. The field is uniform.
B. The field increases in strength as the distance from the wire
increases.
ANSWERS NEWEST UPDATED 2025/2026 A
COMPLETE EXAM ALL ANSWERS
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The correct answer is C, zero. The kinetic energy of an object of mass m
moving at speed v is 1/2mv2. Since the object has the same speed
before and after striking the wall, its kinetic energy does not change. -
CORRECT ANSWERS An object with mass m and speed v0 directed
to the right strikes a wall and rebounds with speed v0 directed to the
left.
The change in the object's kinetic energy is
A. - mv02
B. -1/2mv02
C. Zero
D. 1/2mv02
E. mv02
The correct answer is C, 64.3kg . This question is intended to assess
your knowledge of realistic values for physical quantities as well as an
understanding of experimental error and significant figures. Only 60kg
and 64.3kg are likely masses for an adult human. (If you need to
compare the choices in pounds to see this, 1kg is approximately 2.2
pounds.) When recording measurements, it is assumed that there is
some measurement error in the last digit recorded. For both possible
values for the teacher's weight, 0.5 percent is about 0.3kg. Therefore, a
,ACT SCIENCE REVIEW QUESTIONS AND
ANSWERS NEWEST UPDATED 2025/2026 A
COMPLETE EXAM ALL ANSWERS
ACCURATE BEST GRADED A+ FOR SUCCESS
mass recorded to better than this accuracy will indicate tenths of a
kilogram. - CORRECT ANSWERS A teacher measures and records
her own mass to an accuracy of better than 0.5 percent. Which of the
following is most likely the mass that she recorded?
A. 6.43kg
B. 60kg
C. 64.3 kg
D. 600kg
E. 643kg
The correct answer is D, "the time taken to achieve equilibrium after
the copper is dropped into the water." When an amount of heat Q is
transferred to or from a material, its magnitude is given by Q = mc( Tf -
Ti), where m is the mass of the material, c is its specific heat and Tf and
Ti are its final and initial temperature, respectively. As the copper cools,
heat is transferred from it to the water, which gets warmer until both
the copper and water are in equilibrium at the same temperature. By
conservation of energy, the heat transferred from the copper must be
equal to the heat transferred to the water. To determine the specific
heat of copper, the experimenter would set the expression for the heat
,ACT SCIENCE REVIEW QUESTIONS AND
ANSWERS NEWEST UPDATED 2025/2026 A
COMPLETE EXAM ALL ANSWERS
ACCURATE BEST GRADED A+ FOR SUCCESS
transferred from the copper equal to that for the heat transferred to
the water, and solve the equation for the specific heat of copper. Time
does not appear in the expression but the quantities in the other
choices d - CORRECT ANSWERS An experiment is performed to
measure the specific heat of copper. A lump of copper is heated in an
oven, then dropped into a beaker of water. To calculate the specific
heat of copper, the experimenter must know or measure the value of
all of the quantities below EXCEPT the
A. mass of the water
B. original temperatures of the copper and the water
C. final (equilibrium) temperature of the copper and the
water
D. time taken to achieve equilibrium after the copper is
dropped into the water
E specific heat of the water
The correct answer is B, that the internal energy has increased by 4
joules. According to conservation of energy, as expressed by the first
law of thermodynamics, adding 12 joules of heat to an ideal gas would
increase the internal energy of the gas by 12 joules. However, the
internal energy of the gas would decrease by 8 joules if that 8 joules is
, ACT SCIENCE REVIEW QUESTIONS AND
ANSWERS NEWEST UPDATED 2025/2026 A
COMPLETE EXAM ALL ANSWERS
ACCURATE BEST GRADED A+ FOR SUCCESS
converted to work done by the gas. So the net change in the internal
energy of the gas is 12 joules - 8 joules, which is a net increase of 4
joules. - CORRECT ANSWERS In a given process, 12 joules of heat is
added to an ideal gas and the gas does 8 joules of work. Which of the
following is true about the internal energy of the gas during this
process?
A. It is increased by 20 joules
B. It is increased be 4 joules
C It is not changed
D. It has decreased by 4 joules
E It has decreased by 20joules
The correct answer is that the field lines form circles around the wire.
This is a fundamental characteristic of magnetic fields produced by
currents. - CORRECT ANSWERS Which of the following is true of the
magnetic field produced by a current in a long, straight wire?
A. The field is uniform.
B. The field increases in strength as the distance from the wire
increases.
