JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 405 · 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 tag holds JavaScript in a page? (a) <style> (b) <code> (c) <script> (d) <js>
2. 2.⚡ Which word makes a new variable? (a) let (b) put (c) make (d) give
3. 3.⚡ What number does this code print?
   let score = 11;
   score = score + 13;
   score = score - 10;
   console.log(score);
4. 4.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) let (d) for
5. 5.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) let (d) alert()
6. 6.⚡ What number does this code print?
   let a = 9;
   let b = 9;
   console.log(a * b);
7. 7.⚡ What does this code show?
   let name = "Riya";
   alert("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Riya (c) Welcome, name! (d) name
8. 8.⚡ What number does this code print?
   let coins = 11;
   coins = coins + 8;
   coins = coins - 15;
   console.log(coins);
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 4;
   console.log(x + y); (a) 8 (b) 44 (c) Error
10. 10.⚡ What number does this code print?
    let a = 49;
    let b = 1;
    console.log(a - b);
11. 11.⚡ What number does this code print?
    let runs = 27;
    runs = runs + 9;
    runs = runs - 5;
    console.log(runs);
12. 12.⚡ What number does this code print?
    let marks = 28;
    marks = marks + 14;
    marks = marks - 2;
    console.log(marks);
13. 13.⚡ What number does this code print?
    let a = 50;
    let b = 37;
    console.log(a - b);
14. 14.⚡ Which JavaScript word makes a new variable? (a) if (b) console.log() (c) for (d) let
15. 15.⚡ Which JavaScript word repeats code? (a) for (b) if (c) let (d) console.log()
16. 16.⚡ What number does this code print?
    let coins = 21;
    coins = coins + 5;
    coins = coins - 3;
    console.log(coins);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) 99 (b) 18 (c) Error
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y); (a) 9 (b) 54 (c) Error
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y); (a) 45 (b) 9 (c) Error
20. 20.⚡ What number does this code print?
    let coins = 12;
    coins = coins + 11;
    coins = coins - 1;
    console.log(coins);
21. 21.⚡ What number does this code print?
    let a = 10;
    let b = 9;
    console.log(a * b);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y); (a) 74 (b) Error (c) 11
23. 23.⚡ What number does this code print?
    let marks = 11;
    marks = marks + 14;
    marks = marks - 2;
    console.log(marks);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) 9 (b) Error (c) 36
25. 25.⚡ What number does this code print?
    let runs = 29;
    runs = runs + 3;
    runs = runs - 18;
    console.log(runs);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) 21 (b) Error (c) 3
27. 27.⚡ What number does this code print?
    let a = 2;
    let b = 10;
    console.log(a * b);
28. 28.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Aman! (d) Aman
29. 29.⚡ What number does this code print?
    let a = 10;
    let b = 5;
    console.log(a * b);
30. 30.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) Error (b) 39 (c) 12
32. 32.⚡ What does alert() show? (a) a new tab (b) a table (c) a pop-up box (d) a picture
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) 16 (b) Error (c) 97
34. 34.⚡ What number does this code print?
    let a = 7;
    let b = 4;
    console.log(a * b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 7;
    console.log(x + y); (a) 8 (b) Error (c) 17
36. 36.⚡ What number does this code print?
    let a = 40;
    let b = 26;
    console.log(a - b);
37. 37.⚡ What number does this code print?
    let marks = 8;
    marks = marks + 3;
    marks = marks - 7;
    console.log(marks);
38. 38.⚡ What number does this code print?
    let a = 10;
    let b = 7;
    console.log(a + b);
39. 39.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Riya (d) Well done, Riya!
40. 40.⚡ What number does this code print?
    let a = 36;
    let b = 29;
    console.log(a - b);

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