JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 975 · 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.⚡ What does this code show?
   let name = "Riya";
   alert("Well done, " + name + "!"); (a) Well done, Riya! (b) Riya (c) Well done, name! (d) name
2. 2.⚡ What number does this code print?
   let a = 45;
   let b = 29;
   console.log(a + b);
3. 3.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) if (d) console.log()
4. 4.⚡ What number does this code print?
   let a = 39;
   let b = 5;
   console.log(a + b);
5. 5.⚡ Which JavaScript word shows a pop-up box? (a) for (b) let (c) alert() (d) if
6. 6.⚡ What does this code show?
   let name = "Riya";
   alert("Welcome, " + name + "!"); (a) Welcome, Riya! (b) name (c) Riya (d) Welcome, name!
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 1;
   console.log(x + y); (a) Error (b) 6 (c) 51
8. 8.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <script> (d) <js>
9. 9.⚡ What number does this code print?
   let a = 12;
   let b = 10;
   console.log(a - b);
10. 10.⚡ What number does this code print?
    let a = 9;
    let b = 10;
    console.log(a * b);
11. 11.⚡ What number does this code print?
    let score = 14;
    score = score + 17;
    score = score - 8;
    console.log(score);
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) 3 (b) 21 (c) Error
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) Error (b) 29 (c) 11
14. 14.⚡ What number does this code print?
    let coins = 14;
    coins = coins + 2;
    coins = coins - 14;
    console.log(coins);
15. 15.⚡ What does alert() show? (a) a new tab (b) a table (c) a picture (d) a pop-up box
16. 16.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) actions and changes (d) only colours
17. 17.⚡ What number does this code print?
    let a = 54;
    let b = 34;
    console.log(a - b);
18. 18.⚡ Which JavaScript word makes a new variable? (a) let (b) if (c) alert() (d) for
19. 19.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) name (b) Kabir (c) Hi, name! (d) Hi, Kabir!
20. 20.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Arjun (c) Welcome, Arjun! (d) name
21. 21.⚡ What number does this code print?
    let a = 6;
    let b = 39;
    console.log(a + b);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) Error (b) 87 (c) 15
23. 23.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .html (d) .js
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) 63 (b) Error (c) 9
25. 25.⚡ What number does this code print?
    let a = 8;
    let b = 22;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let a = 2;
    let b = 10;
    console.log(a * b);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 13 (b) 4 (c) Error
28. 28.⚡ What number does this code print?
    let score = 6;
    score = score + 5;
    score = score - 7;
    console.log(score);
29. 29.⚡ What number does this code print?
    let marks = 25;
    marks = marks + 16;
    marks = marks - 19;
    console.log(marks);
30. 30.⚡ What number does this code print?
    let runs = 15;
    runs = runs + 10;
    runs = runs - 14;
    console.log(runs);
31. 31.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Arjun (b) Hi, name! (c) name (d) Hi, Arjun!
32. 32.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) in the console (d) on the title bar
33. 33.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Zoya! (c) Zoya (d) Welcome, name!
34. 34.⚡ Which JavaScript word repeats code? (a) for (b) alert() (c) if (d) console.log()
35. 35.⚡ What number does this code print?
    let a = 5;
    let b = 6;
    console.log(a * b);
36. 36.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, Aman! (b) Aman (c) Hello, name! (d) name
37. 37.⚡ What number does this code print?
    let marks = 12;
    marks = marks + 18;
    marks = marks - 27;
    console.log(marks);
38. 38.⚡ Which word makes a new variable? (a) let (b) give (c) put (d) make
39. 39.⚡ What number does this code print?
    let books = 5;
    books = books + 9;
    books = books - 7;
    console.log(books);
40. 40.⚡ What number does this code print?
    let a = 31;
    let b = 11;
    console.log(a - b);

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