JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 822 · 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 alert() show? (a) a pop-up box (b) a table (c) a new tab (d) a picture
2. 2.⚡ Which JavaScript word writes in the console? (a) console.log() (b) let (c) for (d) alert()
3. 3.⚡ What number does this code print?
   let a = 52;
   let b = 39;
   console.log(a + b);
4. 4.⚡ Which JavaScript word makes a new variable? (a) if (b) console.log() (c) for (d) let
5. 5.⚡ Which word makes a new variable? (a) make (b) give (c) let (d) put
6. 6.⚡ What does this code show?
   let name = "Zoya";
   console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Zoya! (c) name (d) Zoya
7. 7.⚡ What does this code show?
   let name = "Riya";
   console.log("Hi, " + name + "!"); (a) Hi, Riya! (b) Riya (c) Hi, name! (d) name
8. 8.⚡ What number does this code print?
   let a = 2;
   let b = 8;
   console.log(a * b);
9. 9.⚡ What number does this code print?
   let a = 9;
   let b = 22;
   console.log(a + b);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) 8 (b) 53 (c) Error
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 72 (b) 9 (c) Error
12. 12.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the page title (d) the domain name
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) 10 (b) 37 (c) Error
14. 14.⚡ Which JavaScript word runs code when true? (a) let (b) for (c) alert() (d) if
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) 13 (b) Error (c) 85
16. 16.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) in the console (d) on the title bar
17. 17.⚡ Which JavaScript word shows a pop-up box? (a) for (b) alert() (c) let (d) if
18. 18.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .js (d) .css
19. 19.⚡ What number does this code print?
    let a = 50;
    let b = 25;
    console.log(a - b);
20. 20.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Aman (b) Welcome, name! (c) name (d) Welcome, Aman!
21. 21.⚡ What number does this code print?
    let coins = 10;
    coins = coins + 9;
    coins = coins - 2;
    console.log(coins);
22. 22.⚡ What number does this code print?
    let a = 33;
    let b = 26;
    console.log(a - b);
23. 23.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <script> (d) <style>
24. 24.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Meera (c) Hi, Meera! (d) name
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) Error (b) 8 (c) 26
26. 26.⚡ What number does this code print?
    let apples = 26;
    apples = apples + 13;
    apples = apples - 17;
    console.log(apples);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) 7 (b) 52 (c) Error
28. 28.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Kabir (c) name (d) Welcome, Kabir!
29. 29.⚡ What number does this code print?
    let a = 3;
    let b = 4;
    console.log(a * b);
30. 30.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Welcome, Aman! (b) Aman (c) Welcome, name! (d) name
31. 31.⚡ What number does this code print?
    let a = 21;
    let b = 10;
    console.log(a + b);
32. 32.⚡ What number does this code print?
    let coins = 9;
    coins = coins + 12;
    coins = coins - 5;
    console.log(coins);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) 2 (b) Error (c) 11
34. 34.⚡ What number does this code print?
    let a = 34;
    let b = 8;
    console.log(a - b);
35. 35.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, Meera! (b) name (c) Hi, name! (d) Meera
36. 36.⚡ What number does this code print?
    let a = 27;
    let b = 21;
    console.log(a - b);
37. 37.⚡ What number does this code print?
    let score = 23;
    score = score + 4;
    score = score - 8;
    console.log(score);
38. 38.⚡ What number does this code print?
    let runs = 27;
    runs = runs + 2;
    runs = runs - 18;
    console.log(runs);
39. 39.⚡ What number does this code print?
    let coins = 11;
    coins = coins + 15;
    coins = coins - 6;
    console.log(coins);
40. 40.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Zoya! (c) name (d) Zoya

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