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<div class="xblock xblock-student_view xblock-student_view-vertical" data-runtime-class="LmsRuntime" data-init="VerticalStudentView" data-course-id="DB/JSON/SelfPaced" data-request-token="9c79c4b664fb11e9b12902675b40794c" data-runtime-version="1" data-usage-id="i4x:;_;_DB;_JSON;_vertical;_vert-quiz-json" data-block-type="vertical">
<h2 class="hd hd-2 unit-title">JSON Quiz</h2>
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<p>Each multiple-choice quiz problem is based on a "root question," from which the system generates different correct and incorrect choices each time you take the quiz. Thus, you can test yourself on the same material multiple times. We strongly urge you to continue testing on each topic until you complete the quiz with a perfect score at least once. Simply click the "Reset" button at the bottom of the page for a new variant of the quiz.</p>
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Multiple Choice
</h3>
<div class="problem-progress" id="i4x://DB/JSON/problem/prob-json-problem-progress"></div>
<div class="problem">
<div>
<p>[Q1] Which of the following is NOT a valid JSON object?
</p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><div class="choicegroup capa_inputtype" id="inputtype_i4x-DB-JSON-problem-prob-json_2_1">
<fieldset aria-describedby="status_i4x-DB-JSON-problem-prob-json_2_1">
<div class="field">
<label id="i4x-DB-JSON-problem-prob-json_2_1-choice_10-label" class="response-label field-label label-inline" aria-describedby="status_i4x-DB-JSON-problem-prob-json_2_1">
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<span>
<pre>
{ "name": "Smiley",
"age": 20,
"phone": "888-123-4567",
"email": "smiley@xyz.com",
"happy": yes }
</pre>
</span>
</label>
</div>
<div class="field">
<label id="i4x-DB-JSON-problem-prob-json_2_1-choice_8-label" class="response-label field-label label-inline" aria-describedby="status_i4x-DB-JSON-problem-prob-json_2_1">
<input type="radio" name="input_i4x-DB-JSON-problem-prob-json_2_1" id="input_i4x-DB-JSON-problem-prob-json_2_1_choice_8" class="field-input input-radio" value="choice_8"/>
<span>
<pre>
{ "name": "Smiley",
"age": 20,
"phone": null,
"email": "null",
"happy": true }
</pre>
</span>
</label>
</div>
<div class="field">
<label id="i4x-DB-JSON-problem-prob-json_2_1-choice_2-label" class="response-label field-label label-inline" aria-describedby="status_i4x-DB-JSON-problem-prob-json_2_1">
<input type="radio" name="input_i4x-DB-JSON-problem-prob-json_2_1" id="input_i4x-DB-JSON-problem-prob-json_2_1_choice_2" class="field-input input-radio" value="choice_2"/>
<span>
<pre>
{ "name": "Smiley",
"age": 20,
"phone": "888-123-4567",
"email": "smiley@xyz.com",
"happy": "true" }
</pre>
</span>
</label>
</div>
<div class="field">
<label id="i4x-DB-JSON-problem-prob-json_2_1-choice_3-label" class="response-label field-label label-inline" aria-describedby="status_i4x-DB-JSON-problem-prob-json_2_1">
<input type="radio" name="input_i4x-DB-JSON-problem-prob-json_2_1" id="input_i4x-DB-JSON-problem-prob-json_2_1_choice_3" class="field-input input-radio" value="choice_3"/>
<span>
<pre>
{ "name": "Smiley",
"age": 20,
"phone": "888-123-4567",
"email": "smiley@xyz.com",
"happy": true }
</pre>
</span>
</label>
</div>
<span id="answer_i4x-DB-JSON-problem-prob-json_2_1"/>
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<span id="solution_i4x-DB-JSON-problem-prob-json_solution_2"/>
</div></solutionset>
<hr/>
<br/>
<p>[Q2] Which of the following is NOT a valid JSON array?
</p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 2" role="group"><div class="choicegroup capa_inputtype" id="inputtype_i4x-DB-JSON-problem-prob-json_3_1">
<fieldset aria-describedby="status_i4x-DB-JSON-problem-prob-json_3_1">
<div class="field">
<label id="i4x-DB-JSON-problem-prob-json_3_1-choice_0-label" class="response-label field-label label-inline" aria-describedby="status_i4x-DB-JSON-problem-prob-json_3_1">
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<span>
<pre>
[ 1, 2, "dog", "cat", true, false, [1, "dog", null], {} ]
</pre>
</span>
</label>
</div>
<div class="field">
<label id="i4x-DB-JSON-problem-prob-json_3_1-choice_8-label" class="response-label field-label label-inline" aria-describedby="status_i4x-DB-JSON-problem-prob-json_3_1">
<input type="radio" name="input_i4x-DB-JSON-problem-prob-json_3_1" id="input_i4x-DB-JSON-problem-prob-json_3_1_choice_8" class="field-input input-radio" value="choice_8"/>
<span>
<pre>
[ 1, 2, "dog", "cat", true, false, [1, "dog", null],
{"pet":"dog", "fun":true} ]
</pre>
</span>
</label>
</div>
<div class="field">
<label id="i4x-DB-JSON-problem-prob-json_3_1-choice_5-label" class="response-label field-label label-inline" aria-describedby="status_i4x-DB-JSON-problem-prob-json_3_1">
<input type="radio" name="input_i4x-DB-JSON-problem-prob-json_3_1" id="input_i4x-DB-JSON-problem-prob-json_3_1_choice_5" class="field-input input-radio" value="choice_5"/>
<span>
<pre>
[ 1, 2, dog, cat, true, false, [1, "dog", null],
{"pet":"dog", "fun":true} ]
</pre>
</span>
</label>
</div>
<div class="field">
<label id="i4x-DB-JSON-problem-prob-json_3_1-choice_4-label" class="response-label field-label label-inline" aria-describedby="status_i4x-DB-JSON-problem-prob-json_3_1">
<input type="radio" name="input_i4x-DB-JSON-problem-prob-json_3_1" id="input_i4x-DB-JSON-problem-prob-json_3_1_choice_4" class="field-input input-radio" value="choice_4"/>
<span>
<pre>
[ 1, 2, "dog", "cat", true, false, [],
{"pet":"dog", "fun":true} ]
</pre>
</span>
</label>
</div>
<span id="answer_i4x-DB-JSON-problem-prob-json_3_1"/>
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<span class="status unanswered" id="status_i4x-DB-JSON-problem-prob-json_3_1" data-tooltip="Not yet answered.">
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<span id="solution_i4x-DB-JSON-problem-prob-json_solution_7"/>
</div></solutionset>
<hr/>
<br/>
<p>[Q3] Consider the following JSON Schema specification:
</p>
<p>
<pre>
{
"type": "object",
"properties":
{ "ItemID": { "type":"string", "pattern":"Item*" },
"ItemName": { "type":"string" },
"Price": { "type":"integer", "minimum":10, "maximum":100 },
"Sellers": { "type":"array", "maxItems":3,
"items": { "type":"string" }},
"Ratings": { "type":"array",
"items":
{ "type": "object",
"properties": {"Rater":
{"type": "string", "optional": true},
"Score":
{"type": "integer", "minimum":1,
"maxiumum":5}}}},
"AvgRating": { "type":"number", "optional":true },
"FreeShipping": {"type":"boolean" }
}
}
</pre>
</p>
<p>Select, from the choices below, the JSON data that <i>is</i> valid according to the JSON Schema specification above.</p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 3" role="group"><div class="choicegroup capa_inputtype" id="inputtype_i4x-DB-JSON-problem-prob-json_4_1">
<fieldset aria-describedby="status_i4x-DB-JSON-problem-prob-json_4_1">
<div class="field">
<label id="i4x-DB-JSON-problem-prob-json_4_1-choice_2-label" class="response-label field-label label-inline" aria-describedby="status_i4x-DB-JSON-problem-prob-json_4_1">
<input type="radio" name="input_i4x-DB-JSON-problem-prob-json_4_1" id="input_i4x-DB-JSON-problem-prob-json_4_1_choice_2" class="field-input input-radio" value="choice_2"/>
<span>
<pre>
{ "ItemID": "Item123",
"ItemName": "desk",
"Price": "50",
"Sellers": ["Amy","Ben"],
"Ratings": [{"Rater":"Amy", "Score":5}, {"Score":1},
{"Rater":"Carl", "Score":4}],
"AvgRating": 3.33,
"FreeShipping": true }
</pre>
</span>
</label>
</div>
<div class="field">
<label id="i4x-DB-JSON-problem-prob-json_4_1-choice_11-label" class="response-label field-label label-inline" aria-describedby="status_i4x-DB-JSON-problem-prob-json_4_1">
<input type="radio" name="input_i4x-DB-JSON-problem-prob-json_4_1" id="input_i4x-DB-JSON-problem-prob-json_4_1_choice_11" class="field-input input-radio" value="choice_11"/>
<span>
<pre>
{ "ItemID": "Item123",
"ItemName": "desk",
"Price": 50,
"Sellers": ["Amy","Ben"],
"Ratings": [{"Rater":"Amy", "Score":5}, {"Score":1},
{"Rater":"Carl", "Score":4}],
"FreeShipping": true }
</pre>
</span>
</label>
</div>
<div class="field">
<label id="i4x-DB-JSON-problem-prob-json_4_1-choice_1-label" class="response-label field-label label-inline" aria-describedby="status_i4x-DB-JSON-problem-prob-json_4_1">
<input type="radio" name="input_i4x-DB-JSON-problem-prob-json_4_1" id="input_i4x-DB-JSON-problem-prob-json_4_1_choice_1" class="field-input input-radio" value="choice_1"/>
<span>
<pre>
{ "ItemID": "123",
"ItemName": "desk",
"Price": 50,
"Sellers": ["Amy","Ben"],
"Ratings": [{"Rater":"Amy", "Score":5}, {"Score":1},
{"Rater":"Carl", "Score":4}],
"AvgRating": 3.33,
"FreeShipping": true }
</pre>
</span>
</label>
</div>
<div class="field">
<label id="i4x-DB-JSON-problem-prob-json_4_1-choice_4-label" class="response-label field-label label-inline" aria-describedby="status_i4x-DB-JSON-problem-prob-json_4_1">
<input type="radio" name="input_i4x-DB-JSON-problem-prob-json_4_1" id="input_i4x-DB-JSON-problem-prob-json_4_1_choice_4" class="field-input input-radio" value="choice_4"/>
<span>
<pre>
{ "ItemID": "Item123",
"ItemName": "desk",
"Price": 50,
"Sellers": ["Amy","Ben","Eve","Fred"],
"Ratings": [{"Rater":"Amy", "Score":5}, {"Score":1},
{"Rater":"Carl", "Score":4}],
"AvgRating": 3.33,
"FreeShipping": true }
</pre>
</span>
</label>
</div>
<span id="answer_i4x-DB-JSON-problem-prob-json_4_1"/>
</fieldset>
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<span class="status unanswered" id="status_i4x-DB-JSON-problem-prob-json_4_1" data-tooltip="Not yet answered.">
<span class="sr">unanswered</span><span class="status-icon" aria-hidden="true"/>
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<div class="solution-span">
<span id="solution_i4x-DB-JSON-problem-prob-json_solution_15"/>
</div></solutionset>
<hr/>
<br/>
<p>[Q4] Consider the following JSON data:
</p>
<p>
<pre>
{ "A": [1,1,2,2], "B": {"C":3, "D":4}, "E":[5,6,true], "F": {"G": [null,7]} }
</pre>
</p>
<p>Which of the following could NOT be included as part of a JSON Schema specification that is satisfied by the JSON data above? Assume that every letter ("A", "B", "C", ...) appears in the JSON Schema specification exactly once.</p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 4" role="group"><div class="choicegroup capa_inputtype" id="inputtype_i4x-DB-JSON-problem-prob-json_5_1">
<fieldset aria-describedby="status_i4x-DB-JSON-problem-prob-json_5_1">
<div class="field">
<label id="i4x-DB-JSON-problem-prob-json_5_1-choice_11-label" class="response-label field-label label-inline" aria-describedby="status_i4x-DB-JSON-problem-prob-json_5_1">
<input type="radio" name="input_i4x-DB-JSON-problem-prob-json_5_1" id="input_i4x-DB-JSON-problem-prob-json_5_1_choice_11" class="field-input input-radio" value="choice_11"/>
<span>
<pre>
"B": {"type":"object",
"properties": {"C": {"type":["integer","null"]},
"D": {"type":["integer","null"]}}}
</pre>
</span>
</label>
</div>
<div class="field">
<label id="i4x-DB-JSON-problem-prob-json_5_1-choice_13-label" class="response-label field-label label-inline" aria-describedby="status_i4x-DB-JSON-problem-prob-json_5_1">
<input type="radio" name="input_i4x-DB-JSON-problem-prob-json_5_1" id="input_i4x-DB-JSON-problem-prob-json_5_1_choice_13" class="field-input input-radio" value="choice_13"/>
<span>
<pre>
"G": {"type":"array", "items": {"type":["null","integer"]}}
</pre>
</span>
</label>
</div>
<div class="field">
<label id="i4x-DB-JSON-problem-prob-json_5_1-choice_0-label" class="response-label field-label label-inline" aria-describedby="status_i4x-DB-JSON-problem-prob-json_5_1">
<input type="radio" name="input_i4x-DB-JSON-problem-prob-json_5_1" id="input_i4x-DB-JSON-problem-prob-json_5_1_choice_0" class="field-input input-radio" value="choice_0"/>
<span>
<pre>
"A": {"type":"array", "minItems":4, "maxItems":4,
"items":{"type":"integer"}}
</pre>
</span>
</label>
</div>
<div class="field">
<label id="i4x-DB-JSON-problem-prob-json_5_1-choice_4-label" class="response-label field-label label-inline" aria-describedby="status_i4x-DB-JSON-problem-prob-json_5_1">
<input type="radio" name="input_i4x-DB-JSON-problem-prob-json_5_1" id="input_i4x-DB-JSON-problem-prob-json_5_1_choice_4" class="field-input input-radio" value="choice_4"/>
<span>
<pre>
"A": {"type":"array", "minItems":0, "maxItems":3,
"items":{"type":"integer"}}
</pre>
</span>
</label>
</div>
<span id="answer_i4x-DB-JSON-problem-prob-json_5_1"/>
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