JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 593 · 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 JavaScript add to a web page? (a) only colours (b) the page title (c) actions and changes (d) the domain name
2. 2.⚡ Which JavaScript word runs code when true? (a) for (b) let (c) if (d) alert()
3. 3.⚡ What number does this code print?
   let a = 9;
   let b = 8;
   console.log(a * b);
4. 4.⚡ What does this code show?
   let name = "Arjun";
   alert("Hello, " + name + "!"); (a) Hello, Arjun! (b) Hello, name! (c) name (d) Arjun
5. 5.⚡ What number does this code print?
   let a = 10;
   let b = 7;
   console.log(a * b);
6. 6.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <script> (d) <style>
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 2;
   console.log(x + y); (a) 82 (b) Error (c) 10
8. 8.⚡ Where does console.log() show its output? (a) in the console (b) on the printer (c) on the title bar (d) in the address bar
9. 9.⚡ Which JavaScript word makes a new variable? (a) let (b) alert() (c) for (d) if
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 8;
    console.log(x + y); (a) 15 (b) 78 (c) Error
11. 11.⚡ What number does this code print?
    let a = 12;
    let b = 10;
    console.log(a * b);
12. 12.⚡ Which JavaScript word repeats code? (a) if (b) let (c) for (d) console.log()
13. 13.⚡ What number does this code print?
    let a = 6;
    let b = 3;
    console.log(a * b);
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) 8 (b) 71 (c) Error
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) 9 (b) Error (c) 36
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) Error (b) 14 (c) 68
17. 17.⚡ What number does this code print?
    let a = 19;
    let b = 5;
    console.log(a - b);
18. 18.⚡ What number does this code print?
    let marks = 22;
    marks = marks + 13;
    marks = marks - 21;
    console.log(marks);
19. 19.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Zoya (d) Hello, Zoya!
20. 20.⚡ What number does this code print?
    let coins = 9;
    coins = coins + 14;
    coins = coins - 8;
    console.log(coins);
21. 21.⚡ What number does this code print?
    let a = 38;
    let b = 7;
    console.log(a + b);
22. 22.⚡ What number does this code print?
    let a = 42;
    let b = 7;
    console.log(a - b);
23. 23.⚡ What number does this code print?
    let runs = 13;
    runs = runs + 3;
    runs = runs - 11;
    console.log(runs);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) Error (b) 8 (c) 44
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) 13 (b) Error (c) 49
26. 26.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, Riya! (b) name (c) Riya (d) Hello, name!
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) Error (b) 5 (c) 14
28. 28.⚡ What number does this code print?
    let score = 26;
    score = score + 8;
    score = score - 10;
    console.log(score);
29. 29.⚡ What number does this code print?
    let a = 20;
    let b = 11;
    console.log(a + b);
30. 30.⚡ Which word makes a new variable? (a) let (b) make (c) put (d) give
31. 31.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .css (d) .html
32. 32.⚡ What number does this code print?
    let a = 28;
    let b = 25;
    console.log(a - b);
33. 33.⚡ What number does this code print?
    let coins = 27;
    coins = coins + 10;
    coins = coins - 20;
    console.log(coins);
34. 34.⚡ Which JavaScript word writes in the console? (a) console.log() (b) let (c) alert() (d) if
35. 35.⚡ What number does this code print?
    let a = 58;
    let b = 23;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let score = 15;
    score = score + 16;
    score = score - 7;
    console.log(score);
37. 37.⚡ What number does this code print?
    let apples = 29;
    apples = apples + 13;
    apples = apples - 7;
    console.log(apples);
38. 38.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) if (d) alert()
39. 39.⚡ What number does this code print?
    let a = 10;
    let b = 8;
    console.log(a - b);
40. 40.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, Zoya! (b) Hello, name! (c) name (d) Zoya

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