Digital ACT Practice Questions

An environmental biology lab measured the dissolved oxygen concentration (DO in mg/L) in a freshwater reservoir at varying depths during midsummer: • Depth 1 m:...

In a physics experiment testing electromagnetic induction, a student rotates a planar copper coil of area $0.05\text{ m}^2$ inside a uniform magnetic field of $...

A chemistry student measures the pH of four aqueous solutions at $25^\circ\text{C}$: • Solution 1: $[\text{H}^+] = 1.0 \times 10^{-3}\text{ M}$ • Solution 2: $[...

A physics laboratory tested the radioactive decay of a sample of Isotope W. The initial activity was $1,600\text{ counts per minute (cpm)}$. After $36\text{ day...

An ideal gas sample in a sealed cylinder with a movable piston undergoes an isothermal expansion at a constant temperature of $300\text{ K}$. If the volume of t...

In a pea plant genetic cross between two heterozygous purple-flowered plants ($Pp \times Pp$), where purple flower allele ($P$) is dominant to white flower alle...

In a forensic DNA investigation, a molecular geneticist conducts Polymerase Chain Reaction (PCR) amplification on a short tandem repeat (STR) locus. The sample ...

In a ancient genomic paleontology lab, a molecular geneticist conducts Polymerase Chain Reaction (PCR) amplification on a Neanderthal mitochondrial fragment. Th...

In a viral epidemiology diagnostic clinic, a molecular geneticist conducts Polymerase Chain Reaction (PCR) amplification on a RNA-derived cDNA target sequence. ...

An astrophysicist measures the hydrogen absorption spectrum from Star Alpha. The rest laboratory wavelength for the designated spectral line is $\lambda_0 = 656...

A student tested the electrical resistance of four copper wires of varying lengths and cross-sectional areas at $20^\circ\text{C}$: • Wire 1: Length $1.0\text{ ...

In a physics optics laboratory, a monochromatic light ray travels from a medium of refractive index $n_1 = 1.00$ into a flint glass prism of refractive index $n...

A chemistry student must prepare a $0.5\text{ M}$ aqueous solution of hydrochloric acid (HCl) starting from a stock solution with concentration $6.0\text{ M}$. ...

A chemistry student must prepare a $0.25\text{ M}$ aqueous solution of sodium hydroxide (NaOH) starting from a stock solution with concentration $4.0\text{ M}$....

A chemistry student must prepare a $0.6\text{ M}$ aqueous solution of sulfuric acid (H2SO4) starting from a stock solution with concentration $3.0\text{ M}$. Th...

A chemistry student must prepare a $0.2\text{ M}$ aqueous solution of potassium chloride (KCl) starting from a stock solution with concentration $2.5\text{ M}$....

A chemistry student must prepare a $0.75\text{ M}$ aqueous solution of nitric acid (HNO3) starting from a stock solution with concentration $5.0\text{ M}$. The ...

Researchers exposed aquatic Elodea sprigs to light of different wavelengths for 30 minutes and counted the number of oxygen bubbles produced: - Violet (400 nm):...

A cylinder fitted with a frictionless piston contains an ideal gas at a constant temperature of 298 K. The pressure and volume data are recorded: - Trial 1: P =...

A student titrates 25.0 mL of 0.10 M acetic acid (CH3COOH) with 0.10 M NaOH. The pH measurements are recorded: - 0.0 mL NaOH added: pH = 2.87 - 12.5 mL NaOH add...

An experiment fired identical 50-gram spheres horizontally from a 20-meter cliff at an initial velocity of 15 m/s through chambers containing different gases: -...

Light in air (refractive index n = 1.00) enters three different transparent blocks at an incident angle of 45°: - Material X: Refracted angle = 32.0° - Material...

A molecular biology lab ran restriction-digested DNA fragments on an agarose gel at 100 V for 60 minutes: - Fragment 1 (1,000 base pairs): Migration distance = ...

Geologists analyzed the ratio of parent isotope potassium-40 (K-40) to daughter argon-40 (Ar-40) in volcanic ash layers within a sedimentary basin. The half-lif...