JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 90 · 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) let (c) if (d) console.log()
2. 2.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <code> (d) <script>
3. 3.⚡ Which JavaScript word repeats code? (a) for (b) let (c) if (d) alert()
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 7;
   console.log(x + y); (a) 57 (b) 12 (c) Error
5. 5.⚡ What number does this code print?
   let books = 5;
   books = books + 12;
   books = books - 15;
   console.log(books);
6. 6.⚡ What does this code show?
   let name = "Meera";
   console.log("Hi, " + name + "!"); (a) Meera (b) name (c) Hi, Meera! (d) Hi, name!
7. 7.⚡ What number does this code print?
   let marks = 23;
   marks = marks + 11;
   marks = marks - 32;
   console.log(marks);
8. 8.⚡ What number does this code print?
   let coins = 12;
   coins = coins + 14;
   coins = coins - 23;
   console.log(coins);
9. 9.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .html (d) .css
10. 10.⚡ What number does this code print?
    let coins = 28;
    coins = coins + 3;
    coins = coins - 23;
    console.log(coins);
11. 11.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) if (d) let
12. 12.⚡ What number does this code print?
    let apples = 26;
    apples = apples + 12;
    apples = apples - 28;
    console.log(apples);
13. 13.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Riya (d) Well done, Riya!
14. 14.⚡ Which JavaScript word writes in the console? (a) for (b) let (c) alert() (d) console.log()
15. 15.⚡ What number does this code print?
    let a = 17;
    let b = 13;
    console.log(a + b);
16. 16.⚡ What number does this code print?
    let coins = 16;
    coins = coins + 16;
    coins = coins - 11;
    console.log(coins);
17. 17.⚡ What number does this code print?
    let marks = 25;
    marks = marks + 15;
    marks = marks - 18;
    console.log(marks);
18. 18.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a new tab (d) a picture
19. 19.⚡ What number does this code print?
    let a = 36;
    let b = 29;
    console.log(a + b);
20. 20.⚡ What number does this code print?
    let books = 20;
    books = books + 16;
    books = books - 23;
    console.log(books);
21. 21.⚡ Which word makes a new variable? (a) let (b) put (c) give (d) make
22. 22.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Riya (b) Hello, name! (c) name (d) Hello, Riya!
23. 23.⚡ What number does this code print?
    let a = 2;
    let b = 3;
    console.log(a * b);
24. 24.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Zoya! (c) Hello, name! (d) Zoya
25. 25.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Meera (b) name (c) Welcome, Meera! (d) Welcome, name!
26. 26.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Kabir (d) Welcome, Kabir!
27. 27.⚡ What number does this code print?
    let a = 3;
    let b = 11;
    console.log(a * b);
28. 28.⚡ What number does this code print?
    let a = 43;
    let b = 6;
    console.log(a + b);
29. 29.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Aman! (c) Aman (d) name
30. 30.⚡ What number does this code print?
    let marks = 24;
    marks = marks + 6;
    marks = marks - 28;
    console.log(marks);
31. 31.⚡ What number does this code print?
    let coins = 8;
    coins = coins + 14;
    coins = coins - 8;
    console.log(coins);
32. 32.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Meera! (d) Meera
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) Error (b) 94 (c) 13
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) 56 (b) Error (c) 11
35. 35.⚡ What number does this code print?
    let a = 29;
    let b = 32;
    console.log(a + b);
36. 36.⚡ 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
37. 37.⚡ What number does this code print?
    let marks = 19;
    marks = marks + 17;
    marks = marks - 25;
    console.log(marks);
38. 38.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Kabir! (c) Hi, name! (d) Kabir
39. 39.⚡ What number does this code print?
    let a = 47;
    let b = 3;
    console.log(a + b);
40. 40.⚡ What number does this code print?
    let a = 2;
    let b = 11;
    console.log(a * b);

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