JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 144 · 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.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
2. 2.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <script> (d) <js>
3. 3.⚡ Which JavaScript word writes in the console? (a) console.log() (b) if (c) let (d) for
4. 4.⚡ Which JavaScript word runs code when true? (a) for (b) let (c) if (d) console.log()
5. 5.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) let (d) if
6. 6.⚡ What number does this code print?
   let a = 11;
   let b = 7;
   console.log(a - b);
7. 7.⚡ What number does this code print?
   let a = 11;
   let b = 8;
   console.log(a * b);
8. 8.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) let (d) if
9. 9.⚡ What does this code show?
   let name = "Riya";
   alert("Hi, " + name + "!"); (a) name (b) Riya (c) Hi, Riya! (d) Hi, name!
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 7;
    console.log(x + y); (a) 8 (b) Error (c) 17
11. 11.⚡ 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
12. 12.⚡ What number does this code print?
    let a = 15;
    let b = 13;
    console.log(a - b);
13. 13.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the page title (c) the domain name (d) only colours
14. 14.⚡ Which word makes a new variable? (a) let (b) make (c) give (d) put
15. 15.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) name (c) Hello, name! (d) Hello, Riya!
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) 8 (b) Error (c) 71
17. 17.⚡ What number does this code print?
    let a = 34;
    let b = 17;
    console.log(a - b);
18. 18.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Arjun! (c) Arjun (d) name
19. 19.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Zoya (b) Well done, name! (c) Well done, Zoya! (d) name
20. 20.⚡ What number does this code print?
    let a = 5;
    let b = 2;
    console.log(a * b);
21. 21.⚡ What number does this code print?
    let coins = 19;
    coins = coins + 15;
    coins = coins - 19;
    console.log(coins);
22. 22.⚡ What number does this code print?
    let coins = 23;
    coins = coins + 18;
    coins = coins - 31;
    console.log(coins);
23. 23.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Kabir (c) name (d) Welcome, Kabir!
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) 55 (b) 10 (c) Error
25. 25.⚡ What number does this code print?
    let a = 59;
    let b = 6;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let score = 6;
    score = score + 15;
    score = score - 8;
    console.log(score);
27. 27.⚡ What number does this code print?
    let coins = 5;
    coins = coins + 19;
    coins = coins - 5;
    console.log(coins);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) 17 (b) 89 (c) Error
29. 29.⚡ What number does this code print?
    let a = 34;
    let b = 31;
    console.log(a + b);
30. 30.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Aman (b) Welcome, name! (c) name (d) Welcome, Aman!
31. 31.⚡ What number does this code print?
    let coins = 20;
    coins = coins + 2;
    coins = coins - 20;
    console.log(coins);
32. 32.⚡ What number does this code print?
    let a = 46;
    let b = 33;
    console.log(a - b);
33. 33.⚡ What number does this code print?
    let runs = 20;
    runs = runs + 10;
    runs = runs - 5;
    console.log(runs);
34. 34.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 4;
    apples = apples - 1;
    console.log(apples);
35. 35.⚡ What number does this code print?
    let a = 11;
    let b = 12;
    console.log(a * b);
36. 36.⚡ Which JavaScript word makes a new variable? (a) if (b) console.log() (c) for (d) let
37. 37.⚡ What number does this code print?
    let a = 26;
    let b = 5;
    console.log(a - b);
38. 38.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a table (d) a picture
39. 39.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Meera (b) Hi, Meera! (c) Hi, name! (d) name
40. 40.⚡ What number does this code print?
    let a = 32;
    let b = 10;
    console.log(a + b);

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