JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 278 · 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) actions and changes (b) the page title (c) only colours (d) the domain name
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 6;
   console.log(x + y); (a) 9 (b) 36 (c) Error
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 8;
   console.log(x + y); (a) 17 (b) 98 (c) Error
4. 4.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) console.log() (d) let
5. 5.⚡ What number does this code print?
   let a = 54;
   let b = 16;
   console.log(a + b);
6. 6.⚡ What number does this code print?
   let a = 53;
   let b = 40;
   console.log(a + b);
7. 7.⚡ What number does this code print?
   let apples = 9;
   apples = apples + 4;
   apples = apples - 4;
   console.log(apples);
8. 8.⚡ What number does this code print?
   let runs = 28;
   runs = runs + 16;
   runs = runs - 11;
   console.log(runs);
9. 9.⚡ Which JavaScript word writes in the console? (a) for (b) if (c) alert() (d) console.log()
10. 10.⚡ Which word makes a new variable? (a) let (b) make (c) give (d) put
11. 11.⚡ What number does this code print?
    let score = 26;
    score = score + 8;
    score = score - 21;
    console.log(score);
12. 12.⚡ What number does this code print?
    let a = 4;
    let b = 6;
    console.log(a * b);
13. 13.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Meera! (c) Welcome, name! (d) Meera
14. 14.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .jpg (d) .css
15. 15.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <script> (d) <code>
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) Error (b) 3 (c) 21
17. 17.⚡ What number does this code print?
    let a = 21;
    let b = 5;
    console.log(a + b);
18. 18.⚡ Which JavaScript word runs code when true? (a) for (b) alert() (c) if (d) console.log()
19. 19.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) for (d) console.log()
20. 20.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Riya (b) Welcome, Riya! (c) name (d) Welcome, name!
21. 21.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Meera (b) name (c) Hello, name! (d) Hello, Meera!
22. 22.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) if (d) alert()
23. 23.⚡ What number does this code print?
    let a = 8;
    let b = 8;
    console.log(a * b);
24. 24.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) name (b) Riya (c) Well done, Riya! (d) Well done, name!
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) 23 (b) 5 (c) Error
26. 26.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 20;
    runs = runs - 26;
    console.log(runs);
27. 27.⚡ What number does this code print?
    let a = 59;
    let b = 2;
    console.log(a + b);
28. 28.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Meera (b) Well done, Meera! (c) name (d) Well done, name!
29. 29.⚡ What number does this code print?
    let a = 6;
    let b = 1;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let a = 9;
    let b = 5;
    console.log(a * b);
31. 31.⚡ What number does this code print?
    let a = 11;
    let b = 15;
    console.log(a + b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) 10 (b) Error (c) 82
33. 33.⚡ What number does this code print?
    let a = 12;
    let b = 2;
    console.log(a * b);
34. 34.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, Aman! (b) Aman (c) Hello, name! (d) name
35. 35.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) Zoya (c) name (d) Welcome, name!
36. 36.⚡ 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
37. 37.⚡ What number does this code print?
    let a = 39;
    let b = 28;
    console.log(a + b);
38. 38.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Meera (b) Welcome, name! (c) Welcome, Meera! (d) name
39. 39.⚡ What number does this code print?
    let runs = 25;
    runs = runs + 2;
    runs = runs - 5;
    console.log(runs);
40. 40.⚡ What number does this code print?
    let marks = 22;
    marks = marks + 19;
    marks = marks - 14;
    console.log(marks);

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