Digital ACT Practice Questions

A 632.8 nm red helium-neon laser passed through a diffraction grating (500 lines/mm): - Screen distance D = 1.0 m: Fringe distance y = 32.5 cm - Screen distance...

Onion root tip cells were treated with colchicine (which arrests cells in metaphase): - Control: 8% of cells in metaphase - 0.01% Colchicine: 24% of cells in me...

The solubility of potassium chlorate (KClO3) in 100 g of water was measured: - 20°C: 7.3 g - 40°C: 14.0 g - 60°C: 24.5 g - 80°C: 38.5 g If a saturated solution ...

In a classic genetics cross between heterozygous purple-flowered pea plants (Pp x Pp): - Purple offspring: 705 - White offspring: 224 The observed phenotypic ra...

A solenoid with 500 turns had magnetic field B measured at its center: - Current = 1.0 A: B = 1.26 mT - Current = 2.0 A: B = 2.51 mT - Current = 3.0 A: B = 3.77...

Acetic acid and ethanol react to form ethyl acetate: CH3COOH + C2H5OH CH3COOC2H5 + H2O. - Trial 1 (No catalyst, 25°C): Equilibrium reached after 48 hours - Tria...

Paleoclimatologists analyzed oxygen-18 (delta 18O) in an Antarctic ice core: - Modern ice (0 m depth): delta 18O = -35.0 permil - Glacial maximum ice (2,000 m d...

A 100 cm^3 solid brass cylinder was submerged in various liquids and the buoyant force was measured: - Gasoline (density = 0.68 g/cm^3): Buoyant force = 0.67 N ...

Arabidopsis thaliana seeds were germinated on agar plates containing NaCl: - 0 mM NaCl: 98% germination - 50 mM NaCl: 92% germination - 100 mM NaCl: 64% germina...

Calcium carbonate reacted with 1.0 M HCl to produce CO2: - Form 1 (Solid marble chip, 5.0 g): Reaction completed in 320 s - Form 2 (Coarse granules, 5.0 g): Rea...

Water rose in glass capillary tubes of different internal radii: - Radius = 0.2 mm: Height = 74 mm - Radius = 0.4 mm: Height = 37 mm - Radius = 0.8 mm: Height =...

A PCR assay amplified a 500 bp target gene from 1 initial copy: - Cycle 10: ~1,000 copies - Cycle 20: ~1,000,000 copies - Cycle 30: ~1,000,000,000 copies This e...

Two carts collided on a frictionless air track: - Cart A (1.0 kg, 3.0 m/s) collides with stationary Cart B (2.0 kg, 0 m/s) and they stick together. - Combined f...

Vapor pressure of three liquids was measured at 20°C: - Water: 2.3 kPa - Ethanol: 5.8 kPa - Diethyl ether: 58.6 kPa Which liquid has the weakest intermolecular ...

A patient's blood was tested with Anti-A and Anti-B diagnostic antibodies: - Anti-A added: Strong agglutination (clumping) - Anti-B added: No agglutination What...

A Daniell galvanic cell Zn(s) | Zn^2+(aq) || Cu^2+(aq) | Cu(s) had cell voltage measured: - [Cu^2+] = 1.0 M, [Zn^2+] = 1.0 M: Voltage = 1.10 V - [Cu^2+] = 1.0 M...

A paleoclimatology study compared Earth's orbital parameters with Pleistocene ice volume: - Orbital eccentricity oscillates on a ~100,000-year period. - Axial o...

Water flows through a horizontal pipe that constricts from radius 5 cm to 2 cm: - In wide section (5 cm): Velocity = 1.0 m/s, Pressure = 150 kPa - In narrow con...

Oat coleoptiles were exposed to unidirectional light: - Tip intact: Bends toward light (42° curvature) - Tip removed: No bending (0°) - Tip covered with opaque ...

A 1.0 kg mass oscillates on a vertical spring (k = 100 N/m): - At top of swing (maximum displacement): Kinetic energy = 0 J, Potential energy = 2.0 J - At equil...

Hoffman apparatus electrolysis of acidified water (2 H2O -> 2 H2 + O2) produced gases at cathode and anode: - Cathode: Gas A volume = 40.0 mL - Anode: Gas B vol...

An object was placed at various distances d_o in front of a concave mirror (focal length f = 20 cm): - d_o = 60 cm: Image distance d_i = 30 cm, Real, Inverted -...

Biochemists measured DNA melting temperature (Tm) for synthetic oligonucleotides: - Oligo 1 (20% GC, 80% AT): Tm = 68.2°C - Oligo 2 (40% GC, 60% AT): Tm = 76.5°...

A uniform lever balanced horizontally on a central fulcrum: - Left side: Mass m1 = 4.0 kg at distance d1 = 1.5 m (Torque = 4.0 * 1.5 = 6.0 kg*m) - Right side: M...