Physics — Semester B
Free Practice · 10 Questions · 20 min
20:00Exit
1
2
3
4
5
6
7
8
9
10
Question 1 of 10
TEKS 6A-6EMedium Calc Word Diagram

The diagram shows electric field lines around two point charges. What is the sign of each charge?

AB
AA is +, B is +
BA is −, B is +
CA is +, B is −
DA is −, B is −
Explanation
📌 Field lines EMERGE from positive charges and CONVERGE into negative charges. In the diagram, arrows point OUT of A (so A is positive) and INTO B (so B is negative). Distractor A: both would show outward arrows; C: reversed; D: both would show inward arrows.
Question 2 of 10
TEKS 6A-6EMedium Calc Word Diagram

The diagram shows two point charges. Charge A has +4 μC and charge B has +2 μC. They are separated by 0.10 m. What is the direction of the force on charge B due to charge A?

A+4 μCB+2 μC0.10 m
AAway from A (repulsive)
BToward A (attractive)
CZero force
DPerpendicular to the line AB
Explanation
📌 Both charges are positive (like charges). Like charges REPEL. So force on B points AWAY from A. Magnitudes are given: F = kq_A q_B/d² = (8.99×10⁹)(4×10⁻⁶)(2×10⁻⁶)/(0.10)² = 7.19 N, but the question asks direction only. Distractor A: opposite direction; C: force is nonzero; D: force is along line, not perpendicular.
Question 3 of 10
TEKS 8E-9DMedium Calc Word Diagram

The diagram shows energy levels of an atom. An electron transitions from level n = 3 to level n = 1. What happens?

Electron transition n = 3 → n = 1E3E2E1n = 3n = 2n = 1e-
AThe atom loses one proton
BNothing happens
CThe atom absorbs a photon of energy hf
DThe atom emits a photon with energy equal to E₃ − E₁
Explanation
📌 When an electron drops from a higher energy level to a lower one, the atom emits a photon whose energy = E_higher − E_lower. Frequency of the emitted photon is set by hf = ΔE. This is the origin of emission spectra. Distractor A: absorption is the reverse process; C: protons are in the nucleus, not affected by electron transitions; D: emission happens.
Question 4 of 10
TEKS 6A-6EEasy Word

Which of the following is a good conductor of electricity?

ACopper
BWood
CRubber
DGlass
Explanation
📌 Metals are conductors because their electrons can move freely. Copper is one of the most-used conductors. Wood, rubber, and glass are insulators.
Question 5 of 10
TEKS 6A-6EEasy Word

A 12 V battery is connected across a 4 Ω resistor. What is the current through the resistor?

12 V battery across 4 Ω resistor — current+−V = 12 VR = 4 ΩIFind the current I through the resistor.
A48 A
B3.0 A
C16 A
D0.33 A
Explanation
📌 Ohm's law: I = V/R = 12/4 = 3.0 A. Distractor A: reciprocal (R/V); C: multiplied V × R; D: added V + R.
Question 6 of 10
TEKS 8E-9DMedium Calc Word

What is the energy of a photon with frequency 5.0 × 10¹⁴ Hz? Use h = 6.63 × 10⁻³⁴ J·s.

Photon with frequency f = 5.0 × 10¹⁴ Hzwave, f = 5.0 × 10¹⁴ HzγphotonE = h·f = ?h = 6.63 × 10⁻³⁴ J·sFind the photon energy.
A1.3 × 10¹⁹ J
B3.3 × 10⁻¹⁹ J
C3.3 × 10⁻²⁰ J
D5.0 × 10¹⁴ J
Explanation
📌 E = hf = (6.63 × 10⁻³⁴)(5.0 × 10¹⁴) = 33.15 × 10⁻²⁰ = 3.3 × 10⁻¹⁹ J. Distractor B: wrong sign of exponent; C: reported f; D: off by factor of 10.
Question 7 of 10
TEKS 8GHard Calc Word Diagram

The ray diagram shows an object placed farther than 2f from a converging (convex) lens. What is TRUE of the image?

Converging lens · object at distance 3F from the lens2FFF′2F′lensobjectd0 = 3F
AReal, inverted, and reduced
BVirtual, inverted, and same size
CVirtual, upright, and enlarged
DReal, upright, and enlarged
Explanation
📌 Object beyond 2f of a converging lens: image is on the OPPOSITE side (real), inverted (flipped), and reduced (smaller than object). This is how a camera lens works. Distractor B: describes a magnifying glass (object within f); C: converging lens never produces upright real image; D: nonsense combination.
Question 8 of 10
TEKS 8A-8DMedium Calc Word

A wave has a wavelength of 0.5 m and a frequency of 340 Hz. What is its speed?

A170 m/s
B680 m/s
C0.0015 m/s
D68 m/s
Explanation
📌 v = λf = 0.5 × 340 = 170 m/s. Distractor A: divided; C: multiplied wrong; D: reciprocal.
Question 9 of 10
TEKS 6A-6EMedium Calc Word Diagram

In the circuit shown, a 12 V battery drives current through two resistors in series: R₁ = 4 Ω and R₂ = 8 Ω. What is the current through R₁?

12 VR14 ΩR28 ΩI
A3.0 A
B1.0 A
C1.5 A
D0.5 A
Explanation
📌 Series: R_total = 4 + 8 = 12 Ω. Current is the same everywhere: I = V/R = 12/12 = 1.0 A. Distractor A: only used R₂; C: split difference; D: forgot to add resistors (used just R₁: 12/4 = 3).
Question 10 of 10
TEKS 8A-8DMedium Calc Word

The frequency of a wave is 500 Hz. What is its period?

Wave with frequency 500 Hz — find the periodT = ?f = 500 Hz
A500 ms
B2 ms
C0.5 s
D500 s
Explanation
📌 T = 1/f = 1/500 = 0.002 s = 2 ms. Distractor A: T = f; C: wrong reciprocal; D: 500 ms is 0.5s.

Score
Correct
Wrong
Try Again Exit