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Practise 32 original U.S. household storage questions. This curated bank covers selected foods, cooling, thawing, leftovers and outages; it is not a food-handler examination or a decision service for your actual food.

Source snapshot: 11 September 2026. U.S. cold-storage chart reviewed 19 September 2023; outage chart reviewed 8 August 2024. Freezer windows describe quality under continuous freezing. Never use smell or taste to establish safety; discard perishables when exposure is uncertain. For foods outside this bank, consult FoodKeeper.

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Topic performance

Which storage topics need another look? Correct and missed answers for the topics sampled in this round; this is not a measure of all food-safety knowledge.

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Answer ledger

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Food Safety Basics Quiz Practice U.S. home food safety with 24 original scenarios, clear answer explanations and focused retries of the questions you missed.
Food Allergen Safety Quiz Practice U.S. food allergen safety with 24 original true-or-false questions, answer explanations and focused retries of missed questions.
Breast Milk Storage Time Calculator Find a breast milk use-by time from its current state and storage condition, with CDC-based windows and stricter care-context cautions.
Cooked Yield Shrinkage Calculator Calculate cooked yield and shrinkage from measured batch weights, then price finished portions and plan the next as-purchased quantity.

A food's storage life can change when it is opened, cooked or cut. Raw chicken and a cooked chicken dinner have different refrigerator windows, just as whole fruit and cut fruit can require different decisions after a power failure. Safe food storage means matching the food and its condition to the right temperature, handling and time limit.

Refrigeration slows the growth of harmful bacteria, but it does not make perishable food keep indefinitely. A storage chart assumes appropriate handling and temperatures. It cannot establish that a package was chilled promptly after shopping or that yesterday's leftovers cooled safely.

Safety
Whether food can cause illness. Harmful bacteria or their toxins may be present without an obvious change in appearance or smell.
Quality
How food tastes and feels. Dry patches from freezer burn can reduce quality without themselves showing that the food became unsafe.

That distinction matters when freezing food for later meals. Properly handled food kept continuously at 0°F, about −18°C, or colder can remain safe indefinitely, although its quality declines. Freezing does not kill most bacteria. It cannot make unsafe food safe, and raw poultry still needs proper cooking after thawing.

For refrigerated food, U.S. household guidance uses 40°F, about 4°C, or colder. An appliance thermometer checks the temperature rather than relying on the refrigerator dial. The food category still matters at that temperature. Opening luncheon meat changes the applicable storage window, and hard-cooked eggs do not keep as long as raw shell eggs. When a meal is postponed, timely freezing may be appropriate instead of extending a short refrigerator stay.

Cooking a large batch creates another storage challenge. A deep pot of soup cools more slowly than smaller, shallow portions, so leaving it on the counter until it reaches room temperature can prolong warm exposure. Hot food can go into the refrigerator in suitable portions. During thawing, the aim is likewise to keep food from spending too long warm rather than merely to remove the ice.

Cold storage also does not stop raw juices from contaminating ready-to-eat food. Sealed, leakproof packaging and separation protect foods such as salad that will not receive another cooking step. This transfer of contamination between foods is called cross-contamination.

After an outage, the food type and its temperature history matter more than whether the refrigerator has started running again. Smell and taste cannot establish safety. Discard perishable food when its warm exposure is uncertain. These U.S. household principles are educational guidance, not an individualized food-safety assessment or a substitute for professional advice.

How to Use This Tool:

Practise with 32 original text questions. The starting setup is All storage topics, Mixed difficulty, 10 questions and Learn feedback.

  1. Choose a Topic or food group and Difficulty. Use the broad selection or focus on a storage topic, Meat & poultry, Eggs or Produce. Basics and Applied decisions select different questions rather than changing their point values.
  2. Select an offered Question count. The mixed all-topic round offers 1, 3, 5, 10, 20 or 32 questions. Other selections have smaller pools, sometimes only one or two questions. If a setup change makes the current count unavailable, it changes to that selection's default.
    Under Advanced, the optional Replay seed accepts up to 128 characters. A blank, invalid or overlong value uses a fixed default seed. Surrounding spaces are ignored. To reproduce a challenge, keep the seed, setup and question-bank version the same.
  3. Choose Feedback timing. Learn reveals the correction, explanation and source after each answer. Review records answers without revealing correctness until the completed round.
  4. Select Start practice, then choose one of the four answers. Selecting an answer records and locks it immediately; there is no separate submit step. Use Next question to advance after each recorded answer.
  5. Complete every question and select View results after the final answer. A final result requires an answer to every question; there is no early-finish result. Read Missed answer review for corrections and use the Answer ledger to revisit any question, including answers you got right.
  6. Choose the next practice round. Retry missed starts a separate attempt containing only wrong answers and appears only when there are misses. Replay same seed repeats the questions and answer order. Try a new seed changes the seed but can still select familiar questions. Change setup clears the current attempt so you can choose another scope.

Interpreting Results:

During a round, Practice status and the progress percentage describe how many questions you have answered, not how many are correct. The completed result shows correct answers out of the selected question count. Perfect round means there were no misses in that particular attempt, not that every food-storage situation has been covered.

Use each explanation to identify the condition that changed the answer, such as raw versus cooked food, an opened package, hot-weather exposure or a food-specific outage exception. For a real storage decision, check the current guidance for the exact food and its known handling history rather than treating a quiz answer as approval to eat it.

Topic performance shows correct and missed counts for topics sampled in the round. Short rounds need not balance the six topics, and untested topics are not rated. Review focus points to the category with the most misses, not a measured level of proficiency. A category with more questions has more opportunities for misses.

A missed-only retry is a smaller, different sample, so its score is not directly comparable with the original round. For more meaningful comparisons, keep the topic, difficulty, count and feedback timing consistent, and remember that reviewing the explanations can make repeated questions familiar.

Technical Details:

Storage rules combine a food category with specified temperatures and handling conditions. Refrigerator windows limit how long particular foods should be kept chilled; freezer windows concern quality only while appropriate continuous freezing is maintained. Neither replaces a check of earlier handling.

Temperature and exposure limits

For perishables left without safe hot or cold holding, the general refrigeration deadline shortens in hot weather. These are maximum handling limits, not suggested waiting times. Celsius equivalents below are approximate.

Situation Temperature or time boundary Meaning
Refrigerator storage At or below 40°F, about 4°C Check an appliance thermometer; a cold-setting dial is not a temperature reading.
Freezer storage At or below 0°F, about −18°C Continuous freezing preserves properly handled food for safety, not indefinite quality.
Perishables left out when the air is not above 90°F Refrigerate within 2 hours Discard when unrefrigerated exposure exceeds the limit.
Perishables exposed to air above 90°F, about 32°C Refrigerate within 1 hour The shorter limit applies above 90°F, not only after two hours have passed.
Reheating properly stored leftovers At least 165°F, about 74°C Confirm the internal temperature with a food thermometer.

Selected refrigerator windows

These chart entries assume prompt refrigeration at 40°F or colder and appropriate prior handling. The opened-luncheon-meat window applies from opening. A listed window does not excuse earlier unsafe exposure or override applicable storage instructions.

Food and condition Refrigerator window
Fresh raw chicken pieces 1 to 2 days
Fresh raw ground beef 1 to 2 days
Fresh raw beef steak 3 to 5 days
Opened or deli-sliced luncheon meat 3 to 5 days
Raw eggs in their shells 3 to 5 weeks
Hard-cooked eggs 1 week
Cooked meat or poultry leftovers 3 to 4 days

Freezing within the appropriate refrigerator window is an option when plans change. It does not erase prior warm exposure. For example, the longer steak window must not be substituted for the shorter ground-beef window.

Cooling, thawing and preventing contamination

Divide large batches into smaller, shallow containers and refrigerate promptly. Hot food does not need to stand until room temperature first. Leave space for cold air to circulate rather than tightly overpacking the refrigerator.

Thaw meat in the refrigerator, in cold water or in the microwave, not on the counter. Cold-water thawing requires a leakproof package and fresh cold water every 30 minutes. Cook immediately after cold-water or microwave thawing. Marinating also belongs in the refrigerator, even when the marinade is acidic.

Keep raw poultry in sealed, leakproof packaging, separate from ready-to-eat foods. Eggs belong in their original carton in the main refrigerator compartment rather than the door. These precautions address contamination and storage conditions that a day count alone cannot describe.

When microwaving leftovers, spread them evenly and stir to reduce cold spots. Thorough reheating is for food that was stored safely. Cooked rice left at room temperature overnight should be discarded because some toxins formed during unsafe storage can survive cooking.

Power outages — holding estimates and food-specific rules

Closed-appliance holding times estimate how long food may remain cold without power. They are not extra time allowances once food has warmed. The food-specific entries below follow FoodSafety.gov’s Food Safety During Power Outage chart.

Food or appliance Time or condition Interpretation or action
Unopened refrigerator without another cold source Up to 4 hours without power A holding estimate with the door kept closed, not four hours of warm-food exposure.
Full freezer, door kept closed Approximately 48 hours Check food condition and temperature afterward.
Half-full freezer, door kept closed Approximately 24 hours Do not assume the full-freezer estimate applies.
Refrigerated raw poultry or cut fresh fruit 40°F or above for more than 2 hours Discard under the chart's exposure category.
Clean, undamaged, uncut fresh fruit The same outage exposure category Keep under the uncut-fruit entry; do not apply it to cut fruit.
Frozen beef Ice crystals remain and the food is refrigerator-cold Refreezing is permitted; quality may decline.
Ice cream or frozen yogurt Even in the chart's ice-crystal category Discard. The meat refreezing rule is not universal.

The source wording overlaps at exactly 40°F: routine refrigerator guidance says at or below 40°F, while the outage chart labels its exposure category at or above 40°F for more than two hours. Do not turn those summaries into a precision test at that boundary. A single rounded temperature reading does not establish the food's earlier temperature history.

Practice scoring and completion

Each question has one correct answer among four choices. A correct response earns one point and a wrong response earns zero, with no weighting or penalties. Let N be the selected question count, C the number correct and A the number answered. The possible score is zero to N points. C, A and N are counts of questions and are integers satisfying 0 ≤ C ≤ A ≤ N, with N ≥ 1. Points count correct answers; accuracy and progress are percentages.

The equations distinguish correctness from completion. Accuracy uses all selected questions as its denominator, not only those already answered.

Score points = C Accuracy (%) = 100 × C N Progress (%) = 100 × A N

For a five-question round with three answers recorded and two correct, progress is 60% and the equivalent accuracy is 40%. The two unanswered questions remain in the denominator, but they are not counted as incorrect or included in missed-only practice. Completion requires all five responses.

The main completed result is the fraction C/N. Accuracy retains its unrounded calculated value. Only the visible progress label rounds to the nearest whole percent, with half-percent ties upward, without changing the score. There is no pass mark or proficiency band.

Questions are selected without replacement, so a question does not repeat within one round. The seed determines selection and answer order. Selecting the entire eligible pool covers that pool once; a new seed cannot add questions beyond it. Different rounds can contain the same questions.

Limitations and Privacy:

The question bank uses a source snapshot dated 11 September 2026, not live food-storage advice. Its cited cold-storage chart was reviewed on 19 September 2023 and its outage chart on 8 August 2024. A newer statement on a linked source page does not automatically change the questions.

  • Coverage consists of eight Refrigerator questions and eight Power outages questions, plus four each for Freezer, Cooling, Thawing and Leftovers. Across the whole bank, 15 questions are classified as Basics and 17 as Applied decisions.
  • Food-group filters reuse 15 meat-and-poultry, three egg and two produce cases from the same bank. They are not separate comprehensive food databases. Consult FoodKeeper for storage guidance on foods outside this selection.
  • These are independent U.S. household learning questions, not official government questions or a food-handler examination. They do not cover commercial Food Code compliance, canning, infant feeding or every FoodKeeper entry, and they cannot certify food-handling competence.

Scoring happens in your browser. Attempt data in the URL is not encrypted or private progress storage: the page or share URL carries the setup, seed, answers and current position, including partial attempts. A recipient can restore those choices. Links may enter browser history or be transmitted when opened or shared. Avoid personal details in a replay seed, and do not treat a saved attempt link as private. Browser scoring does not imply offline operation or zero network traffic.

Change setup clears the current attempt and its URL state, not copies already shared or saved elsewhere. There is no account-based progress record. An incompatible or damaged saved attempt is rejected rather than silently scored against different questions. If Saved attempt unavailable appears, choose an available setup and start a new round; use Return to setup when it is offered.

Worked Examples:

A hot car changes the time limit

In Cooling with Applied decisions, the hot-car question describes perishables left in a 95°F car for 75 minutes without ice. The applicable limit is 60 minutes, so the exposure exceeds it by 15 minutes. Choosing the discard answer is correct. Applying the ordinary two-hour limit misses the hot-weather condition; refrigerating or freezing the groceries afterward does not undo that exposure.

Whole fruit is not cut fruit

Choose Produce, Mixed difficulty, two questions and Review. The round includes a clean, undamaged, uncut apple and cut melon, each warmed above 40°F for three hours. Keeping the apple is correct; applying that same whole-fruit rule to the melon is wrong. Those choices produce a completed score of 1/2, equivalent to 50%, and the correction directs discarding the melon. Topic performance places both questions under Power outages because that is the situation being tested. Retry missed then creates a one-question melon retry rather than repeating the already-correct apple question.

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