JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 809 · 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 = 30;
   score = score + 4;
   score = score - 6;
   console.log(score);
2. 2.⚡ Which JavaScript word writes in the console? (a) console.log() (b) alert() (c) let (d) if
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 1;
   console.log(x + y); (a) 3 (b) 21 (c) Error
4. 4.⚡ What does this code show?
   let name = "Riya";
   alert("Welcome, " + name + "!"); (a) Welcome, Riya! (b) name (c) Riya (d) Welcome, name!
5. 5.⚡ What number does this code print?
   let a = 52;
   let b = 25;
   console.log(a + b);
6. 6.⚡ What number does this code print?
   let a = 42;
   let b = 9;
   console.log(a - b);
7. 7.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <js> (d) <code>
8. 8.⚡ What number does this code print?
   let a = 4;
   let b = 6;
   console.log(a * b);
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 6;
   console.log(x + y); (a) 14 (b) 86 (c) Error
10. 10.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Meera (d) Hi, Meera!
11. 11.⚡ What number does this code print?
    let a = 60;
    let b = 39;
    console.log(a - b);
12. 12.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) only colours (d) actions and changes
13. 13.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .html (d) .jpg
14. 14.⚡ What number does this code print?
    let a = 28;
    let b = 22;
    console.log(a + b);
15. 15.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Kabir (b) Hi, Kabir! (c) Hi, name! (d) name
16. 16.⚡ What number does this code print?
    let marks = 28;
    marks = marks + 7;
    marks = marks - 12;
    console.log(marks);
17. 17.⚡ What number does this code print?
    let a = 7;
    let b = 10;
    console.log(a * b);
18. 18.⚡ What number does this code print?
    let a = 3;
    let b = 9;
    console.log(a * b);
19. 19.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) if (d) console.log()
20. 20.⚡ What number does this code print?
    let a = 5;
    let b = 5;
    console.log(a * b);
21. 21.⚡ What number does this code print?
    let a = 53;
    let b = 33;
    console.log(a + b);
22. 22.⚡ Which JavaScript word runs code when true? (a) let (b) alert() (c) console.log() (d) if
23. 23.⚡ What number does this code print?
    let runs = 26;
    runs = runs + 2;
    runs = runs - 17;
    console.log(runs);
24. 24.⚡ Which word makes a new variable? (a) put (b) let (c) make (d) give
25. 25.⚡ What number does this code print?
    let a = 27;
    let b = 5;
    console.log(a - b);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) 62 (b) Error (c) 8
27. 27.⚡ What number does this code print?
    let a = 12;
    let b = 9;
    console.log(a * b);
28. 28.⚡ What number does this code print?
    let marks = 17;
    marks = marks + 20;
    marks = marks - 32;
    console.log(marks);
29. 29.⚡ What number does this code print?
    let a = 60;
    let b = 38;
    console.log(a + b);
30. 30.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) on the title bar (d) in the console
31. 31.⚡ Which JavaScript word shows a pop-up box? (a) if (b) for (c) console.log() (d) alert()
32. 32.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Meera! (d) Meera
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 12 (b) 3 (c) Error
34. 34.⚡ 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
35. 35.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Aman (d) Well done, Aman!
36. 36.⚡ What number does this code print?
    let a = 3;
    let b = 11;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 3;
    apples = apples - 8;
    console.log(apples);
38. 38.⚡ What number does this code print?
    let apples = 28;
    apples = apples + 11;
    apples = apples - 2;
    console.log(apples);
39. 39.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, Riya! (b) Riya (c) name (d) Hi, name!
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 9;
    console.log(x + y); (a) 79 (b) 16 (c) Error

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