ACT SCIENCE REVIEW QUESTIONS AND
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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 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?
,ACT SCIENCE REVIEW QUESTIONS AND
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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
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
,ACT SCIENCE REVIEW QUESTIONS AND
ANSWERS NEWEST UPDATED 2025/2026 A
COMPLETE EXAM ALL ANSWERS ACCURATE
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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 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
, ACT SCIENCE REVIEW QUESTIONS AND
ANSWERS NEWEST UPDATED 2025/2026 A
COMPLETE EXAM ALL ANSWERS ACCURATE
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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.
C. The field lines are directed parallel to the wire, but
opposite to the direction of the current.
D. The field lines are directed radially outward from the wire.
E. The field lines form circles about the wire.
The correct answer is D. In this series circuit with just one resistor, the emf across
the battery is equal to the voltage V across the resistor, so if the emf is doubled so
is V. The current I in the resistor is given by Ohm's law,
I = V/R, so if V is doubled while the resistance R remains constant, then I is also
doubled. - CORRECT ANSWERS A single resistor R is connected to a battery
as shown above. The current is I and the power dissipated as heat is P. The circuit
is changed by doubling the emf ε of the battery while R is kept constant.
After the change, the current is
A. ¼
B. ½
C. I
D. 2I
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 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?
,ACT SCIENCE REVIEW QUESTIONS AND
ANSWERS NEWEST UPDATED 2025/2026 A
COMPLETE EXAM ALL ANSWERS ACCURATE
BEST GRADED A+ FOR SUCCESS
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
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
,ACT SCIENCE REVIEW QUESTIONS AND
ANSWERS NEWEST UPDATED 2025/2026 A
COMPLETE EXAM ALL ANSWERS ACCURATE
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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 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
, ACT SCIENCE REVIEW QUESTIONS AND
ANSWERS NEWEST UPDATED 2025/2026 A
COMPLETE EXAM ALL ANSWERS ACCURATE
BEST GRADED A+ FOR SUCCESS
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.
C. The field lines are directed parallel to the wire, but
opposite to the direction of the current.
D. The field lines are directed radially outward from the wire.
E. The field lines form circles about the wire.
The correct answer is D. In this series circuit with just one resistor, the emf across
the battery is equal to the voltage V across the resistor, so if the emf is doubled so
is V. The current I in the resistor is given by Ohm's law,
I = V/R, so if V is doubled while the resistance R remains constant, then I is also
doubled. - CORRECT ANSWERS A single resistor R is connected to a battery
as shown above. The current is I and the power dissipated as heat is P. The circuit
is changed by doubling the emf ε of the battery while R is kept constant.
After the change, the current is
A. ¼
B. ½
C. I
D. 2I
