JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 800 · 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 writes in the console? (a) console.log() (b) alert() (c) let (d) if
2. 2.⚡ What number does this code print?
   let a = 44;
   let b = 30;
   console.log(a - b);
3. 3.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
4. 4.⚡ What number does this code print?
   let a = 58;
   let b = 11;
   console.log(a + b);
5. 5.⚡ What does alert() show? (a) a new tab (b) a picture (c) a table (d) a pop-up box
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 3;
   console.log(x + y); (a) 4 (b) Error (c) 13
7. 7.⚡ What number does this code print?
   let a = 12;
   let b = 3;
   console.log(a * b);
8. 8.⚡ What number does this code print?
   let a = 6;
   let b = 8;
   console.log(a * b);
9. 9.⚡ What does this code show?
   let name = "Riya";
   console.log("Well done, " + name + "!"); (a) Well done, name! (b) Riya (c) Well done, Riya! (d) name
10. 10.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) in the console (d) on the printer
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) Error (b) 62 (c) 8
12. 12.⚡ 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
13. 13.⚡ What number does this code print?
    let a = 10;
    let b = 6;
    console.log(a - b);
14. 14.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <js> (d) <style>
15. 15.⚡ What number does this code print?
    let a = 11;
    let b = 11;
    console.log(a * b);
16. 16.⚡ What number does this code print?
    let score = 16;
    score = score + 15;
    score = score - 9;
    console.log(score);
17. 17.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Kabir (c) Well done, Kabir! (d) name
18. 18.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Hello, Arjun! (b) Arjun (c) Hello, name! (d) name
19. 19.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) actions and changes (d) the page title
20. 20.⚡ Which JavaScript word shows a pop-up box? (a) for (b) console.log() (c) if (d) alert()
21. 21.⚡ Which JavaScript word makes a new variable? (a) if (b) for (c) let (d) alert()
22. 22.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, Aman! (b) Well done, name! (c) Aman (d) name
23. 23.⚡ What number does this code print?
    let a = 4;
    let b = 5;
    console.log(a * b);
24. 24.⚡ Which word makes a new variable? (a) make (b) put (c) let (d) give
25. 25.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Aman (c) name (d) Welcome, Aman!
26. 26.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) Kabir (c) Welcome, name! (d) name
27. 27.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Zoya! (d) Zoya
28. 28.⚡ What number does this code print?
    let score = 19;
    score = score + 14;
    score = score - 27;
    console.log(score);
29. 29.⚡ Which JavaScript word repeats code? (a) let (b) for (c) console.log() (d) if
30. 30.⚡ What number does this code print?
    let apples = 28;
    apples = apples + 2;
    apples = apples - 20;
    console.log(apples);
31. 31.⚡ What number does this code print?
    let a = 59;
    let b = 25;
    console.log(a - b);
32. 32.⚡ Which JavaScript word runs code when true? (a) console.log() (b) alert() (c) if (d) for
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) 11 (b) 38 (c) Error
34. 34.⚡ What number does this code print?
    let a = 8;
    let b = 11;
    console.log(a * b);
35. 35.⚡ What number does this code print?
    let a = 53;
    let b = 29;
    console.log(a + b);
36. 36.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Zoya (b) name (c) Hi, name! (d) Hi, Zoya!
37. 37.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 3;
    runs = runs - 8;
    console.log(runs);
38. 38.⚡ 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
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) 28 (b) Error (c) 10
40. 40.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) name (b) Arjun (c) Welcome, Arjun! (d) Welcome, name!

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