JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 55 · 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 does this code show?
   let name = "Meera";
   console.log("Welcome, " + name + "!"); (a) name (b) Meera (c) Welcome, name! (d) Welcome, Meera!
2. 2.⚡ What number does this code print?
   let a = 53;
   let b = 23;
   console.log(a - b);
3. 3.⚡ Which JavaScript word writes in the console? (a) for (b) let (c) console.log() (d) if
4. 4.⚡ What number does this code print?
   let a = 27;
   let b = 23;
   console.log(a - b);
5. 5.⚡ What number does this code print?
   let apples = 23;
   apples = apples + 5;
   apples = apples - 5;
   console.log(apples);
6. 6.⚡ What number does this code print?
   let a = 23;
   let b = 19;
   console.log(a - b);
7. 7.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a picture (d) a table
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 6;
   console.log(x + y); (a) 10 (b) 46 (c) Error
9. 9.⚡ What number does this code print?
   let apples = 12;
   apples = apples + 12;
   apples = apples - 10;
   console.log(apples);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y); (a) 57 (b) Error (c) 12
11. 11.⚡ What number does this code print?
    let a = 18;
    let b = 1;
    console.log(a + b);
12. 12.⚡ Which JavaScript word repeats code? (a) let (b) if (c) for (d) console.log()
13. 13.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) if (d) for
14. 14.⚡ What number does this code print?
    let a = 6;
    let b = 10;
    console.log(a * b);
15. 15.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) for (d) if
16. 16.⚡ What number does this code print?
    let coins = 16;
    coins = coins + 15;
    coins = coins - 18;
    console.log(coins);
17. 17.⚡ Which word makes a new variable? (a) let (b) put (c) give (d) make
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) Error (b) 44 (c) 8
19. 19.⚡ What number does this code print?
    let score = 26;
    score = score + 6;
    score = score - 5;
    console.log(score);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 4;
    console.log(x + y); (a) Error (b) 84 (c) 12
21. 21.⚡ Which JavaScript word runs code when true? (a) alert() (b) let (c) if (d) for
22. 22.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) only colours (d) the page title
23. 23.⚡ What number does this code print?
    let a = 31;
    let b = 9;
    console.log(a - b);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) 12 (b) 48 (c) Error
25. 25.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, Meera! (b) Hello, name! (c) Meera (d) name
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) Error (b) 32 (c) 5
27. 27.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 2;
    apples = apples - 3;
    console.log(apples);
28. 28.⚡ What number does this code print?
    let score = 5;
    score = score + 14;
    score = score - 15;
    console.log(score);
29. 29.⚡ What number does this code print?
    let runs = 17;
    runs = runs + 2;
    runs = runs - 5;
    console.log(runs);
30. 30.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .html (d) .js
31. 31.⚡ What number does this code print?
    let a = 57;
    let b = 9;
    console.log(a + b);
32. 32.⚡ What number does this code print?
    let a = 4;
    let b = 5;
    console.log(a * b);
33. 33.⚡ What number does this code print?
    let marks = 18;
    marks = marks + 9;
    marks = marks - 26;
    console.log(marks);
34. 34.⚡ What number does this code print?
    let apples = 9;
    apples = apples + 12;
    apples = apples - 13;
    console.log(apples);
35. 35.⚡ What number does this code print?
    let runs = 16;
    runs = runs + 8;
    runs = runs - 2;
    console.log(runs);
36. 36.⚡ What number does this code print?
    let a = 12;
    let b = 16;
    console.log(a + b);
37. 37.⚡ What number does this code print?
    let a = 28;
    let b = 26;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let a = 7;
    let b = 4;
    console.log(a * b);
39. 39.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) name (b) Meera (c) Well done, name! (d) Well done, Meera!
40. 40.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) name (b) Arjun (c) Well done, Arjun! (d) Well done, name!

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