Digital ACT Practice Questions

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 ...

A biology team measured the reaction velocity (in micromoles/min) of human salivary amylase across various pH levels at 37°C: Table 1: - pH 4.0: 12 umol/min - p...

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...

Two paleontologists debate the primary cause of the Cretaceous-Paleogene (K-Pg) mass extinction: Paleontologist 1 asserts that an asteroid impact 66 million yea...

Consider the exothermic synthesis of ammonia in a closed container: N2(g) + 3 H2(g) 2 NH3(g) + 92 kJ. A chemical engineer measures ammonia yield at equilibrium ...

A biology student recorded the rate of cellular respiration in Baker's yeast suspended in varying sucrose concentrations at 25°C: - 0% sucrose: 0.2 mL CO2/min -...

Physics students measured the period T of a pendulum while varying string length L and bob mass M: Experiment 1 (M = 100 g fixed): - L = 0.25 m: T = 1.00 s - L ...

An environmental engineer measured dissolved oxygen (DO) concentration in a freshwater river at various water temperatures: - 5°C: 12.8 mg/L - 10°C: 11.3 mg/L -...

A geophysics team studied seismic P-waves (compressional) and S-waves (shear) traveling through Earth's interior: - P-waves travel through both solids and liqui...

Students tested the electrical conductivity of four aqueous solutions: - Solution 1: 0.1 M NaCl -> 10,800 uS/cm - Solution 2: 0.1 M C12H22O11 (sucrose) -> 12 uS...

An investigation examined the activity of beef liver catalase by measuring oxygen gas produced over 60 seconds at different H2O2 concentrations: - 0.5% H2O2: 14...

A physics lab applied varying tensile forces to a steel spring and measured the resulting displacement x from equilibrium: - Force = 2.0 N: Displacement = 4.0 c...

Agronomists monitored soybean net photosynthesis rate (umol CO2/m^2/s) under different atmospheric CO2 concentrations at constant light intensity: - 200 ppm: 11...