JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 523 · 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 print? (Look at the quotes!)
   let x = "8";
   let y = 5;
   console.log(x + y); (a) Error (b) 13 (c) 85
2. 2.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the page title (d) the domain name
3. 3.⚡ Which word makes a new variable? (a) make (b) put (c) give (d) let
4. 4.⚡ What number does this code print?
   let a = 2;
   let b = 4;
   console.log(a * b);
5. 5.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) console.log() (d) if
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 8;
   console.log(x + y); (a) Error (b) 17 (c) 98
7. 7.⚡ What number does this code print?
   let runs = 25;
   runs = runs + 17;
   runs = runs - 2;
   console.log(runs);
8. 8.⚡ 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
9. 9.⚡ Which JavaScript word runs code when true? (a) if (b) let (c) console.log() (d) alert()
10. 10.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Kabir (b) name (c) Welcome, Kabir! (d) Welcome, name!
11. 11.⚡ What number does this code print?
    let a = 13;
    let b = 17;
    console.log(a + b);
12. 12.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Meera! (c) Hello, name! (d) Meera
13. 13.⚡ What number does this code print?
    let coins = 7;
    coins = coins + 14;
    coins = coins - 18;
    console.log(coins);
14. 14.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) in the address bar (d) on the title bar
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) Error (b) 5 (c) 14
16. 16.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <js> (d) <script>
17. 17.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Meera! (c) Meera (d) Welcome, name!
18. 18.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 2;
    runs = runs - 7;
    console.log(runs);
19. 19.⚡ Which JavaScript word writes in the console? (a) if (b) let (c) for (d) console.log()
20. 20.⚡ What number does this code print?
    let a = 22;
    let b = 3;
    console.log(a + b);
21. 21.⚡ What number does this code print?
    let a = 10;
    let b = 3;
    console.log(a * b);
22. 22.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .jpg (d) .js
23. 23.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 2;
    apples = apples - 4;
    console.log(apples);
24. 24.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) for (d) if
25. 25.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) name (d) Hello, Aman!
26. 26.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, Kabir! (b) Kabir (c) Hi, name! (d) name
27. 27.⚡ What number does this code print?
    let a = 49;
    let b = 7;
    console.log(a + b);
28. 28.⚡ What number does this code print?
    let coins = 13;
    coins = coins + 9;
    coins = coins - 19;
    console.log(coins);
29. 29.⚡ What number does this code print?
    let a = 4;
    let b = 5;
    console.log(a * b);
30. 30.⚡ What number does this code print?
    let score = 22;
    score = score + 7;
    score = score - 22;
    console.log(score);
31. 31.⚡ What number does this code print?
    let runs = 27;
    runs = runs + 17;
    runs = runs - 1;
    console.log(runs);
32. 32.⚡ What number does this code print?
    let score = 28;
    score = score + 18;
    score = score - 12;
    console.log(score);
33. 33.⚡ What number does this code print?
    let a = 30;
    let b = 32;
    console.log(a + b);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) Error (b) 11 (c) 56
35. 35.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a picture (d) a table
36. 36.⚡ What number does this code print?
    let a = 33;
    let b = 28;
    console.log(a - b);
37. 37.⚡ What number does this code print?
    let score = 30;
    score = score + 5;
    score = score - 10;
    console.log(score);
38. 38.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) name (b) Zoya (c) Hello, name! (d) Hello, Zoya!
39. 39.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Kabir! (c) Kabir (d) name
40. 40.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Kabir (b) name (c) Welcome, Kabir! (d) Welcome, name!

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