JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 566 · 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 this code show?
   let name = "Kabir";
   console.log("Welcome, " + name + "!"); (a) Kabir (b) name (c) Welcome, Kabir! (d) Welcome, name!
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 2;
   console.log(x + y); (a) 92 (b) Error (c) 11
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 3;
   console.log(x + y); (a) Error (b) 13 (c) 4
4. 4.⚡ Which JavaScript word repeats code? (a) alert() (b) if (c) for (d) let
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 2;
   console.log(x + y); (a) Error (b) 6 (c) 42
6. 6.⚡ What does this code show?
   let name = "Kabir";
   alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Kabir! (c) Kabir (d) name
7. 7.⚡ What number does this code print?
   let a = 55;
   let b = 31;
   console.log(a + b);
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 7;
   console.log(x + y); (a) 77 (b) Error (c) 14
9. 9.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <code> (d) <script>
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) 37 (b) 10 (c) Error
11. 11.⚡ Which JavaScript word writes in the console? (a) console.log() (b) for (c) alert() (d) let
12. 12.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
13. 13.⚡ What number does this code print?
    let a = 37;
    let b = 22;
    console.log(a - b);
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) Error (b) 14 (c) 95
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) 64 (b) Error (c) 10
16. 16.⚡ What number does this code print?
    let a = 6;
    let b = 10;
    console.log(a * b);
17. 17.⚡ What number does this code print?
    let coins = 10;
    coins = coins + 4;
    coins = coins - 10;
    console.log(coins);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) 73 (b) Error (c) 10
19. 19.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Meera (d) Hello, Meera!
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) 18 (b) 99 (c) Error
21. 21.⚡ Which JavaScript word runs code when true? (a) for (b) let (c) alert() (d) if
22. 22.⚡ What number does this code print?
    let a = 18;
    let b = 16;
    console.log(a + b);
23. 23.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) only colours (d) actions and changes
24. 24.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) for (d) if
25. 25.⚡ What number does this code print?
    let a = 9;
    let b = 19;
    console.log(a + b);
26. 26.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Arjun (b) Welcome, name! (c) Welcome, Arjun! (d) name
27. 27.⚡ What number does this code print?
    let a = 8;
    let b = 2;
    console.log(a - b);
28. 28.⚡ What number does this code print?
    let a = 51;
    let b = 21;
    console.log(a - b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) Error (b) 49 (c) 13
30. 30.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, Arjun! (b) Arjun (c) Well done, name! (d) name
31. 31.⚡ What number does this code print?
    let coins = 22;
    coins = coins + 12;
    coins = coins - 12;
    console.log(coins);
32. 32.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) if (c) console.log() (d) for
33. 33.⚡ What number does this code print?
    let runs = 26;
    runs = runs + 17;
    runs = runs - 30;
    console.log(runs);
34. 34.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Riya (b) Welcome, Riya! (c) name (d) Welcome, name!
35. 35.⚡ What number does this code print?
    let a = 12;
    let b = 8;
    console.log(a * b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) 14 (b) Error (c) 86
37. 37.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) in the address bar (d) on the printer
38. 38.⚡ What number does this code print?
    let a = 56;
    let b = 7;
    console.log(a + b);
39. 39.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .html (d) .css
40. 40.⚡ What number does this code print?
    let a = 7;
    let b = 9;
    console.log(a * b);

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