JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 426 · 40 questions

Code tip (Line by line): let x = 5; makes a variable x holding 5; x = x + 2; changes it to 7. console.log(…) writes in the console; alert(…) shows a pop-up box. Text in quotes + anything = joined text: "5" + 3 → "53".

1. 1.⚡ Which word makes a new variable? (a) give (b) put (c) let (d) make
2. 2.⚡ What number does this code print?
   let a = 30;
   let b = 1;
   console.log(a + b);
3. 3.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <js> (d) <code>
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 6;
   console.log(x + y); (a) 8 (b) 26 (c) Error
5. 5.⚡ What number does this code print?
   let score = 21;
   score = score + 3;
   score = score - 12;
   console.log(score);
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 3;
   console.log(x + y); (a) 63 (b) Error (c) 9
7. 7.⚡ What does alert() show? (a) a new tab (b) a table (c) a picture (d) a pop-up box
8. 8.⚡ Which JavaScript word makes a new variable? (a) if (b) console.log() (c) let (d) for
9. 9.⚡ What number does this code print?
   let apples = 14;
   apples = apples + 8;
   apples = apples - 11;
   console.log(apples);
10. 10.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .css (d) .html
11. 11.⚡ What number does this code print?
    let coins = 7;
    coins = coins + 16;
    coins = coins - 12;
    console.log(coins);
12. 12.⚡ What number does this code print?
    let score = 7;
    score = score + 16;
    score = score - 9;
    console.log(score);
13. 13.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) for (d) if
14. 14.⚡ What number does this code print?
    let score = 29;
    score = score + 19;
    score = score - 13;
    console.log(score);
15. 15.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) console.log() (d) for
16. 16.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) console.log() (d) for
17. 17.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Zoya (b) name (c) Hi, Zoya! (d) Hi, name!
18. 18.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Aman (b) Hi, name! (c) name (d) Hi, Aman!
19. 19.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Riya! (c) Riya (d) name
20. 20.⚡ What number does this code print?
    let a = 18;
    let b = 12;
    console.log(a + b);
21. 21.⚡ What number does this code print?
    let score = 27;
    score = score + 7;
    score = score - 9;
    console.log(score);
22. 22.⚡ What number does this code print?
    let score = 22;
    score = score + 5;
    score = score - 8;
    console.log(score);
23. 23.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) name (b) Meera (c) Welcome, name! (d) Welcome, Meera!
24. 24.⚡ What number does this code print?
    let a = 51;
    let b = 29;
    console.log(a + b);
25. 25.⚡ What number does this code print?
    let a = 47;
    let b = 33;
    console.log(a - b);
26. 26.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Meera (b) Hello, name! (c) name (d) Hello, Meera!
27. 27.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 3;
    runs = runs - 4;
    console.log(runs);
28. 28.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Aman (b) name (c) Well done, Aman! (d) Well done, name!
29. 29.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Welcome, Arjun! (b) name (c) Welcome, name! (d) Arjun
30. 30.⚡ What number does this code print?
    let apples = 18;
    apples = apples + 19;
    apples = apples - 11;
    console.log(apples);
31. 31.⚡ What number does this code print?
    let marks = 11;
    marks = marks + 11;
    marks = marks - 16;
    console.log(marks);
32. 32.⚡ What number does this code print?
    let apples = 13;
    apples = apples + 18;
    apples = apples - 31;
    console.log(apples);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) 99 (b) Error (c) 18
34. 34.⚡ What number does this code print?
    let books = 25;
    books = books + 11;
    books = books - 24;
    console.log(books);
35. 35.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) Hello, Aman! (c) Hello, name! (d) name
36. 36.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Kabir (b) name (c) Hi, name! (d) Hi, Kabir!
37. 37.⚡ What number does this code print?
    let a = 5;
    let b = 2;
    console.log(a * b);
38. 38.⚡ What number does this code print?
    let a = 24;
    let b = 17;
    console.log(a + b);
39. 39.⚡ Which JavaScript word runs code when true? (a) let (b) for (c) console.log() (d) if
40. 40.⚡ What number does this code print?
    let a = 11;
    let b = 31;
    console.log(a + b);

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