JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 514 · 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) for (b) if (c) let (d) console.log()
2. 2.⚡ What does this code show?
   let name = "Meera";
   alert("Hello, " + name + "!"); (a) Meera (b) Hello, name! (c) Hello, Meera! (d) name
3. 3.⚡ 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
4. 4.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the page title (c) the domain name (d) only colours
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 1;
   console.log(x + y); (a) Error (b) 21 (c) 3
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 9;
   console.log(x + y); (a) 12 (b) Error (c) 39
7. 7.⚡ What number does this code print?
   let runs = 20;
   runs = runs + 19;
   runs = runs - 27;
   console.log(runs);
8. 8.⚡ What number does this code print?
   let a = 6;
   let b = 3;
   console.log(a * b);
9. 9.⚡ Which JavaScript word writes in the console? (a) console.log() (b) alert() (c) for (d) if
10. 10.⚡ What number does this code print?
    let a = 45;
    let b = 32;
    console.log(a - b);
11. 11.⚡ What number does this code print?
    let marks = 16;
    marks = marks + 11;
    marks = marks - 6;
    console.log(marks);
12. 12.⚡ What number does this code print?
    let runs = 26;
    runs = runs + 12;
    runs = runs - 20;
    console.log(runs);
13. 13.⚡ What number does this code print?
    let runs = 26;
    runs = runs + 11;
    runs = runs - 23;
    console.log(runs);
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) 67 (b) 13 (c) Error
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 9;
    console.log(x + y); (a) Error (b) 14 (c) 59
16. 16.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Well done, Zoya! (b) Zoya (c) name (d) Well done, name!
17. 17.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Meera (b) Well done, name! (c) Well done, Meera! (d) name
18. 18.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 6;
    apples = apples - 4;
    console.log(apples);
19. 19.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) console.log() (d) for
20. 20.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Kabir! (d) Kabir
21. 21.⚡ What number does this code print?
    let marks = 23;
    marks = marks + 20;
    marks = marks - 30;
    console.log(marks);
22. 22.⚡ What number does this code print?
    let apples = 28;
    apples = apples + 17;
    apples = apples - 33;
    console.log(apples);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y); (a) Error (b) 93 (c) 12
24. 24.⚡ What number does this code print?
    let score = 16;
    score = score + 17;
    score = score - 7;
    console.log(score);
25. 25.⚡ Which word makes a new variable? (a) make (b) put (c) give (d) let
26. 26.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) console.log() (d) for
27. 27.⚡ Where does console.log() show its output? (a) in the console (b) on the printer (c) on the title bar (d) in the address bar
28. 28.⚡ What number does this code print?
    let a = 22;
    let b = 14;
    console.log(a - b);
29. 29.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Aman! (d) Aman
30. 30.⚡ What number does this code print?
    let a = 50;
    let b = 25;
    console.log(a + b);
31. 31.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .js (d) .jpg
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) 8 (b) Error (c) 62
33. 33.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <style> (d) <script>
34. 34.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Riya! (c) Welcome, name! (d) Riya
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) 15 (b) Error (c) 69
36. 36.⚡ Which JavaScript word repeats code? (a) let (b) for (c) if (d) console.log()
37. 37.⚡ What number does this code print?
    let coins = 19;
    coins = coins + 14;
    coins = coins - 11;
    console.log(coins);
38. 38.⚡ What number does this code print?
    let books = 20;
    books = books + 10;
    books = books - 27;
    console.log(books);
39. 39.⚡ What number does this code print?
    let a = 7;
    let b = 3;
    console.log(a * b);
40. 40.⚡ What number does this code print?
    let apples = 17;
    apples = apples + 7;
    apples = apples - 10;
    console.log(apples);

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