JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 574 · 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.⚡ What number does this code print?
   let score = 19;
   score = score + 13;
   score = score - 25;
   console.log(score);
2. 2.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Kabir! (c) Kabir (d) name
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 4;
   console.log(x + y); (a) 14 (b) 5 (c) Error
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 4;
   console.log(x + y); (a) Error (b) 9 (c) 54
5. 5.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) if (d) for
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 9;
   console.log(x + y); (a) Error (b) 19 (c) 10
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 3;
   console.log(x + y); (a) 43 (b) Error (c) 7
8. 8.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .html (d) .jpg
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 4;
   console.log(x + y); (a) Error (b) 24 (c) 6
10. 10.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <code> (d) <script>
11. 11.⚡ Which JavaScript word shows a pop-up box? (a) for (b) let (c) alert() (d) console.log()
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) 13 (b) 94 (c) Error
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) 82 (b) 10 (c) Error
14. 14.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the title bar (d) on the printer
15. 15.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) for (d) alert()
16. 16.⚡ What number does this code print?
    let a = 12;
    let b = 8;
    console.log(a * b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) 13 (b) Error (c) 67
18. 18.⚡ What number does this code print?
    let a = 11;
    let b = 12;
    console.log(a * b);
19. 19.⚡ What number does this code print?
    let books = 18;
    books = books + 7;
    books = books - 3;
    console.log(books);
20. 20.⚡ What number does this code print?
    let runs = 7;
    runs = runs + 20;
    runs = runs - 10;
    console.log(runs);
21. 21.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
22. 22.⚡ What number does this code print?
    let a = 9;
    let b = 10;
    console.log(a * b);
23. 23.⚡ What number does this code print?
    let a = 43;
    let b = 28;
    console.log(a - b);
24. 24.⚡ What number does this code print?
    let coins = 16;
    coins = coins + 20;
    coins = coins - 2;
    console.log(coins);
25. 25.⚡ What number does this code print?
    let a = 6;
    let b = 8;
    console.log(a * b);
26. 26.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Aman (c) Hello, Aman! (d) Hello, name!
27. 27.⚡ What number does this code print?
    let a = 17;
    let b = 16;
    console.log(a + b);
28. 28.⚡ What number does this code print?
    let books = 8;
    books = books + 15;
    books = books - 18;
    console.log(books);
29. 29.⚡ What number does this code print?
    let score = 18;
    score = score + 17;
    score = score - 25;
    console.log(score);
30. 30.⚡ What number does this code print?
    let a = 4;
    let b = 7;
    console.log(a * b);
31. 31.⚡ Which JavaScript word repeats code? (a) if (b) let (c) for (d) console.log()
32. 32.⚡ What number does this code print?
    let apples = 19;
    apples = apples + 16;
    apples = apples - 23;
    console.log(apples);
33. 33.⚡ What number does this code print?
    let score = 11;
    score = score + 7;
    score = score - 14;
    console.log(score);
34. 34.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, Kabir! (b) Hello, name! (c) Kabir (d) name
35. 35.⚡ What number does this code print?
    let a = 55;
    let b = 38;
    console.log(a + b);
36. 36.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Riya (b) Hello, Riya! (c) name (d) Hello, name!
37. 37.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 19;
    apples = apples - 12;
    console.log(apples);
38. 38.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, Aman! (b) Aman (c) Well done, name! (d) name
39. 39.⚡ What number does this code print?
    let runs = 12;
    runs = runs + 11;
    runs = runs - 16;
    console.log(runs);
40. 40.⚡ What number does this code print?
    let coins = 8;
    coins = coins + 4;
    coins = coins - 6;
    console.log(coins);

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