JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 302 · 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 repeats code? (a) console.log() (b) let (c) for (d) alert()
2. 2.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) console.log() (d) alert()
3. 3.⚡ Which JavaScript word writes in the console? (a) if (b) for (c) console.log() (d) let
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 6;
   console.log(x + y); (a) Error (b) 46 (c) 10
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 3;
   console.log(x + y); (a) Error (b) 11 (c) 83
6. 6.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <script> (d) <js>
7. 7.⚡ What number does this code print?
   let a = 7;
   let b = 34;
   console.log(a + b);
8. 8.⚡ What number does this code print?
   let a = 12;
   let b = 36;
   console.log(a + b);
9. 9.⚡ What number does this code print?
   let apples = 14;
   apples = apples + 4;
   apples = apples - 1;
   console.log(apples);
10. 10.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Kabir (b) Welcome, Kabir! (c) Welcome, name! (d) name
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) 6 (b) Error (c) 15
12. 12.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) console.log() (d) for
13. 13.⚡ What number does this code print?
    let a = 19;
    let b = 19;
    console.log(a + b);
14. 14.⚡ What number does this code print?
    let a = 55;
    let b = 12;
    console.log(a + b);
15. 15.⚡ 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
16. 16.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) for (d) let
17. 17.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Meera! (d) Meera
18. 18.⚡ What number does this code print?
    let a = 44;
    let b = 10;
    console.log(a + b);
19. 19.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) Hello, Aman! (c) name (d) Hello, name!
20. 20.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Arjun (d) Well done, Arjun!
21. 21.⚡ What number does this code print?
    let a = 38;
    let b = 28;
    console.log(a - b);
22. 22.⚡ What number does this code print?
    let a = 5;
    let b = 5;
    console.log(a * b);
23. 23.⚡ What does alert() show? (a) a table (b) a picture (c) a pop-up box (d) a new tab
24. 24.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Aman (b) name (c) Well done, name! (d) Well done, Aman!
25. 25.⚡ What number does this code print?
    let score = 14;
    score = score + 8;
    score = score - 9;
    console.log(score);
26. 26.⚡ What number does this code print?
    let apples = 19;
    apples = apples + 14;
    apples = apples - 10;
    console.log(apples);
27. 27.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Zoya (c) Welcome, Zoya! (d) name
28. 28.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Riya (b) name (c) Well done, Riya! (d) Well done, name!
29. 29.⚡ What number does this code print?
    let apples = 21;
    apples = apples + 18;
    apples = apples - 6;
    console.log(apples);
30. 30.⚡ What number does this code print?
    let a = 10;
    let b = 4;
    console.log(a * b);
31. 31.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
32. 32.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) the page title (d) actions and changes
33. 33.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 9;
    apples = apples - 1;
    console.log(apples);
34. 34.⚡ What number does this code print?
    let a = 40;
    let b = 1;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let apples = 22;
    apples = apples + 6;
    apples = apples - 23;
    console.log(apples);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y); (a) 74 (b) Error (c) 11
37. 37.⚡ 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
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 9;
    console.log(x + y); (a) 16 (b) 79 (c) Error
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) Error (b) 5 (c) 32
40. 40.⚡ What number does this code print?
    let a = 23;
    let b = 2;
    console.log(a - b);

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