JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 749 · 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 runs code when true? (a) console.log() (b) for (c) let (d) if
2. 2.⚡ What number does this code print?
   let a = 9;
   let b = 3;
   console.log(a * b);
3. 3.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) only colours (d) the domain name
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 7;
   console.log(x + y); (a) Error (b) 57 (c) 12
5. 5.⚡ What does this code show?
   let name = "Kabir";
   alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Kabir! (d) Kabir
6. 6.⚡ What number does this code print?
   let score = 25;
   score = score + 15;
   score = score - 21;
   console.log(score);
7. 7.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <script> (d) <style>
8. 8.⚡ Which JavaScript word repeats code? (a) let (b) alert() (c) for (d) console.log()
9. 9.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) for (c) alert() (d) if
10. 10.⚡ Which JavaScript word makes a new variable? (a) if (b) for (c) let (d) console.log()
11. 11.⚡ What number does this code print?
    let runs = 27;
    runs = runs + 8;
    runs = runs - 1;
    console.log(runs);
12. 12.⚡ What does alert() show? (a) a table (b) a new tab (c) a pop-up box (d) a picture
13. 13.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .html (d) .js
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) 4 (b) Error (c) 31
15. 15.⚡ Which word makes a new variable? (a) give (b) put (c) make (d) let
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) 6 (b) Error (c) 51
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y); (a) 93 (b) Error (c) 12
18. 18.⚡ What number does this code print?
    let a = 57;
    let b = 21;
    console.log(a - b);
19. 19.⚡ What number does this code print?
    let a = 9;
    let b = 35;
    console.log(a + b);
20. 20.⚡ What number does this code print?
    let a = 5;
    let b = 11;
    console.log(a * b);
21. 21.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) if (d) console.log()
22. 22.⚡ What number does this code print?
    let a = 58;
    let b = 16;
    console.log(a - b);
23. 23.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
24. 24.⚡ What number does this code print?
    let a = 45;
    let b = 23;
    console.log(a + b);
25. 25.⚡ What number does this code print?
    let a = 10;
    let b = 15;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let a = 3;
    let b = 6;
    console.log(a * b);
27. 27.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Meera! (c) Meera (d) name
28. 28.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Riya! (d) Riya
29. 29.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Meera (b) Welcome, Meera! (c) name (d) Welcome, name!
30. 30.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Zoya! (d) Zoya
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) Error (b) 15 (c) 6
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) Error (b) 10 (c) 37
33. 33.⚡ What number does this code print?
    let score = 25;
    score = score + 9;
    score = score - 2;
    console.log(score);
34. 34.⚡ What number does this code print?
    let marks = 26;
    marks = marks + 18;
    marks = marks - 39;
    console.log(marks);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 4;
    console.log(x + y); (a) Error (b) 84 (c) 12
36. 36.⚡ What number does this code print?
    let a = 6;
    let b = 5;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let apples = 15;
    apples = apples + 9;
    apples = apples - 13;
    console.log(apples);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y); (a) 9 (b) 54 (c) Error
39. 39.⚡ What number does this code print?
    let coins = 24;
    coins = coins + 7;
    coins = coins - 29;
    console.log(coins);
40. 40.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, Zoya! (b) Zoya (c) Hi, name! (d) name

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