JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 687 · 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.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .css (d) .jpg
2. 2.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) the domain name (d) only colours
3. 3.⚡ What number does this code print?
   let coins = 8;
   coins = coins + 15;
   coins = coins - 9;
   console.log(coins);
4. 4.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the printer (d) on the title bar
5. 5.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <code> (d) <js>
6. 6.⚡ What number does this code print?
   let marks = 11;
   marks = marks + 2;
   marks = marks - 5;
   console.log(marks);
7. 7.⚡ Which JavaScript word repeats code? (a) let (b) alert() (c) for (d) if
8. 8.⚡ What number does this code print?
   let a = 6;
   let b = 8;
   console.log(a * b);
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 7;
   console.log(x + y); (a) Error (b) 15 (c) 87
10. 10.⚡ What number does this code print?
    let a = 58;
    let b = 24;
    console.log(a + b);
11. 11.⚡ Which word makes a new variable? (a) let (b) put (c) make (d) give
12. 12.⚡ What number does this code print?
    let a = 29;
    let b = 4;
    console.log(a + b);
13. 13.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) let (d) alert()
14. 14.⚡ What number does this code print?
    let apples = 25;
    apples = apples + 6;
    apples = apples - 1;
    console.log(apples);
15. 15.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Riya (b) Hello, Riya! (c) name (d) Hello, name!
16. 16.⚡ What number does this code print?
    let a = 42;
    let b = 35;
    console.log(a - b);
17. 17.⚡ What number does this code print?
    let a = 42;
    let b = 2;
    console.log(a - b);
18. 18.⚡ What number does this code print?
    let score = 9;
    score = score + 13;
    score = score - 4;
    console.log(score);
19. 19.⚡ What number does this code print?
    let a = 56;
    let b = 15;
    console.log(a - b);
20. 20.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) for (d) alert()
21. 21.⚡ What number does this code print?
    let a = 25;
    let b = 3;
    console.log(a + b);
22. 22.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, Aman! (b) name (c) Aman (d) Hi, name!
23. 23.⚡ What number does this code print?
    let a = 8;
    let b = 23;
    console.log(a + b);
24. 24.⚡ What number does this code print?
    let score = 29;
    score = score + 9;
    score = score - 6;
    console.log(score);
25. 25.⚡ What number does this code print?
    let score = 20;
    score = score + 10;
    score = score - 8;
    console.log(score);
26. 26.⚡ What number does this code print?
    let score = 27;
    score = score + 14;
    score = score - 21;
    console.log(score);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 6;
    console.log(x + y); (a) 16 (b) 7 (c) Error
28. 28.⚡ What number does this code print?
    let coins = 22;
    coins = coins + 2;
    coins = coins - 3;
    console.log(coins);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) Error (b) 12 (c) 3
30. 30.⚡ What number does this code print?
    let a = 35;
    let b = 22;
    console.log(a - b);
31. 31.⚡ What number does this code print?
    let score = 13;
    score = score + 10;
    score = score - 18;
    console.log(score);
32. 32.⚡ What number does this code print?
    let coins = 19;
    coins = coins + 2;
    coins = coins - 16;
    console.log(coins);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) 89 (b) Error (c) 17
34. 34.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Aman! (c) Welcome, name! (d) Aman
35. 35.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) console.log() (d) if
36. 36.⚡ What number does this code print?
    let a = 8;
    let b = 12;
    console.log(a * b);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) 10 (b) 82 (c) Error
38. 38.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Well done, Zoya! (b) Well done, name! (c) name (d) Zoya
39. 39.⚡ What number does this code print?
    let score = 11;
    score = score + 13;
    score = score - 1;
    console.log(score);
40. 40.⚡ What number does this code print?
    let marks = 7;
    marks = marks + 17;
    marks = marks - 19;
    console.log(marks);

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