JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 665 · 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 word makes a new variable? (a) put (b) let (c) give (d) make
2. 2.⚡ What number does this code print?
   let a = 52;
   let b = 21;
   console.log(a + b);
3. 3.⚡ Which JavaScript word runs code when true? (a) console.log() (b) let (c) if (d) alert()
4. 4.⚡ Which JavaScript word writes in the console? (a) let (b) console.log() (c) for (d) if
5. 5.⚡ What number does this code print?
   let score = 9;
   score = score + 3;
   score = score - 7;
   console.log(score);
6. 6.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <script> (d) <code>
7. 7.⚡ What number does this code print?
   let a = 8;
   let b = 7;
   console.log(a * b);
8. 8.⚡ What number does this code print?
   let score = 28;
   score = score + 9;
   score = score - 4;
   console.log(score);
9. 9.⚡ What does this code show?
   let name = "Aman";
   alert("Well done, " + name + "!"); (a) Aman (b) Well done, name! (c) Well done, Aman! (d) name
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) 41 (b) Error (c) 5
11. 11.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, Aman! (b) name (c) Aman (d) Hello, name!
12. 12.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Kabir (c) Hi, Kabir! (d) name
13. 13.⚡ What number does this code print?
    let coins = 25;
    coins = coins + 10;
    coins = coins - 17;
    console.log(coins);
14. 14.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Arjun! (d) Arjun
15. 15.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) only colours (d) the page title
16. 16.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Aman (b) Welcome, Aman! (c) name (d) Welcome, name!
17. 17.⚡ What number does this code print?
    let a = 25;
    let b = 1;
    console.log(a + b);
18. 18.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) alert() (d) for
19. 19.⚡ What number does this code print?
    let coins = 15;
    coins = coins + 18;
    coins = coins - 4;
    console.log(coins);
20. 20.⚡ What number does this code print?
    let score = 20;
    score = score + 18;
    score = score - 8;
    console.log(score);
21. 21.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .js (d) .css
22. 22.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) name (b) Zoya (c) Hello, name! (d) Hello, Zoya!
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) 12 (b) Error (c) 48
24. 24.⚡ What number does this code print?
    let a = 20;
    let b = 30;
    console.log(a + b);
25. 25.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, Aman! (b) Welcome, name! (c) Aman (d) name
26. 26.⚡ What number does this code print?
    let runs = 19;
    runs = runs + 16;
    runs = runs - 2;
    console.log(runs);
27. 27.⚡ Which JavaScript word makes a new variable? (a) alert() (b) for (c) let (d) console.log()
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) 13 (b) 85 (c) Error
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) 89 (b) 17 (c) Error
30. 30.⚡ What number does this code print?
    let books = 16;
    books = books + 14;
    books = books - 14;
    console.log(books);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) 18 (b) Error (c) 99
32. 32.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) name (b) Riya (c) Hello, name! (d) Hello, Riya!
33. 33.⚡ What number does this code print?
    let a = 59;
    let b = 29;
    console.log(a - b);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) Error (b) 4 (c) 22
35. 35.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, Arjun! (b) Arjun (c) name (d) Hi, name!
36. 36.⚡ Which JavaScript word repeats code? (a) if (b) for (c) alert() (d) console.log()
37. 37.⚡ What number does this code print?
    let score = 30;
    score = score + 7;
    score = score - 12;
    console.log(score);
38. 38.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 11;
    apples = apples - 15;
    console.log(apples);
39. 39.⚡ What number does this code print?
    let marks = 29;
    marks = marks + 3;
    marks = marks - 32;
    console.log(marks);
40. 40.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Arjun! (d) Arjun

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