JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 941 · 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) alert() (b) console.log() (c) for (d) if
2. 2.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <code> (d) <script>
3. 3.⚡ What number does this code print?
   let runs = 13;
   runs = runs + 15;
   runs = runs - 15;
   console.log(runs);
4. 4.⚡ What number does this code print?
   let a = 5;
   let b = 3;
   console.log(a * b);
5. 5.⚡ What does this code show?
   let name = "Riya";
   alert("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Riya (c) Welcome, name! (d) name
6. 6.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .css (d) .jpg
7. 7.⚡ What number does this code print?
   let a = 10;
   let b = 3;
   console.log(a * b);
8. 8.⚡ Which JavaScript word makes a new variable? (a) if (b) for (c) let (d) console.log()
9. 9.⚡ Which JavaScript word writes in the console? (a) for (b) alert() (c) let (d) console.log()
10. 10.⚡ What number does this code print?
    let apples = 23;
    apples = apples + 13;
    apples = apples - 20;
    console.log(apples);
11. 11.⚡ What number does this code print?
    let books = 30;
    books = books + 20;
    books = books - 4;
    console.log(books);
12. 12.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) only colours (d) the domain name
13. 13.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Meera (b) Hello, name! (c) Hello, Meera! (d) name
14. 14.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Aman (b) Welcome, name! (c) name (d) Welcome, Aman!
15. 15.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Aman (b) name (c) Hi, name! (d) Hi, Aman!
16. 16.⚡ Which JavaScript word shows a pop-up box? (a) if (b) for (c) alert() (d) console.log()
17. 17.⚡ What number does this code print?
    let runs = 15;
    runs = runs + 9;
    runs = runs - 23;
    console.log(runs);
18. 18.⚡ Which JavaScript word repeats code? (a) for (b) alert() (c) if (d) let
19. 19.⚡ What number does this code print?
    let a = 15;
    let b = 12;
    console.log(a + b);
20. 20.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, Arjun! (b) name (c) Well done, name! (d) Arjun
21. 21.⚡ What number does this code print?
    let a = 28;
    let b = 23;
    console.log(a - b);
22. 22.⚡ What number does this code print?
    let coins = 11;
    coins = coins + 5;
    coins = coins - 9;
    console.log(coins);
23. 23.⚡ What does alert() show? (a) a pop-up box (b) a table (c) a picture (d) a new tab
24. 24.⚡ What number does this code print?
    let a = 4;
    let b = 10;
    console.log(a * b);
25. 25.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Riya! (c) name (d) Riya
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) Error (b) 9 (c) 72
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) 97 (b) 16 (c) Error
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 43 (b) Error (c) 7
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 12 (b) Error (c) 3
30. 30.⚡ Which word makes a new variable? (a) put (b) let (c) make (d) give
31. 31.⚡ What number does this code print?
    let a = 42;
    let b = 32;
    console.log(a - b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) Error (b) 82 (c) 10
33. 33.⚡ What number does this code print?
    let a = 26;
    let b = 2;
    console.log(a - b);
34. 34.⚡ What number does this code print?
    let a = 12;
    let b = 21;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let score = 5;
    score = score + 11;
    score = score - 5;
    console.log(score);
36. 36.⚡ What number does this code print?
    let score = 12;
    score = score + 13;
    score = score - 22;
    console.log(score);
37. 37.⚡ What number does this code print?
    let a = 44;
    let b = 20;
    console.log(a + b);
38. 38.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Aman (b) name (c) Welcome, Aman! (d) Welcome, name!
39. 39.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Hi, Kabir! (b) name (c) Hi, name! (d) Kabir
40. 40.⚡ What number does this code print?
    let a = 10;
    let b = 12;
    console.log(a * b);

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