JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 131 · 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.⚡ Which JavaScript word runs code when true? (a) let (b) console.log() (c) if (d) alert()
2. 2.⚡ What number does this code print?
   let apples = 12;
   apples = apples + 2;
   apples = apples - 13;
   console.log(apples);
3. 3.⚡ What does this code show?
   let name = "Riya";
   console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Riya! (d) Riya
4. 4.⚡ What number does this code print?
   let a = 48;
   let b = 38;
   console.log(a - b);
5. 5.⚡ What number does this code print?
   let runs = 21;
   runs = runs + 5;
   runs = runs - 5;
   console.log(runs);
6. 6.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) if (c) console.log() (d) let
7. 7.⚡ Which JavaScript word writes in the console? (a) if (b) for (c) alert() (d) console.log()
8. 8.⚡ Which JavaScript word makes a new variable? (a) if (b) console.log() (c) alert() (d) let
9. 9.⚡ Which word makes a new variable? (a) make (b) put (c) let (d) give
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) 13 (b) 85 (c) Error
11. 11.⚡ Which JavaScript word repeats code? (a) console.log() (b) if (c) for (d) alert()
12. 12.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, Meera! (b) Hello, name! (c) Meera (d) name
13. 13.⚡ What number does this code print?
    let score = 26;
    score = score + 17;
    score = score - 23;
    console.log(score);
14. 14.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .js (d) .jpg
15. 15.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a picture (d) a table
16. 16.⚡ What number does this code print?
    let a = 5;
    let b = 10;
    console.log(a * b);
17. 17.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the page title (d) the domain name
18. 18.⚡ What number does this code print?
    let runs = 30;
    runs = runs + 6;
    runs = runs - 1;
    console.log(runs);
19. 19.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) on the printer (d) in the console
20. 20.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, Riya! (b) Well done, name! (c) Riya (d) name
21. 21.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) name (c) Hello, name! (d) Hello, Riya!
22. 22.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <script> (d) <js>
23. 23.⚡ What number does this code print?
    let a = 20;
    let b = 14;
    console.log(a + b);
24. 24.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 16;
    apples = apples - 22;
    console.log(apples);
25. 25.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Aman (b) Hi, name! (c) name (d) Hi, Aman!
26. 26.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Riya (b) name (c) Hi, name! (d) Hi, Riya!
27. 27.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Kabir (d) Hello, Kabir!
28. 28.⚡ What number does this code print?
    let a = 9;
    let b = 7;
    console.log(a - b);
29. 29.⚡ What number does this code print?
    let a = 6;
    let b = 9;
    console.log(a * b);
30. 30.⚡ What number does this code print?
    let a = 4;
    let b = 7;
    console.log(a * b);
31. 31.⚡ 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
32. 32.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Aman (b) Well done, Aman! (c) Well done, name! (d) name
33. 33.⚡ What number does this code print?
    let marks = 14;
    marks = marks + 18;
    marks = marks - 29;
    console.log(marks);
34. 34.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Meera! (d) Meera
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 6;
    console.log(x + y); (a) 16 (b) Error (c) 7
36. 36.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Zoya (b) Hi, Zoya! (c) name (d) Hi, name!
37. 37.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Aman! (d) Aman
38. 38.⚡ What number does this code print?
    let a = 35;
    let b = 11;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let a = 55;
    let b = 10;
    console.log(a - b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) 13 (b) Error (c) 76

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