JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 983 · 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 print? (Look at the quotes!)
   let x = "9";
   let y = 2;
   console.log(x + y); (a) Error (b) 11 (c) 92
2. 2.⚡ What number does this code print?
   let a = 31;
   let b = 16;
   console.log(a - b);
3. 3.⚡ What number does this code print?
   let a = 5;
   let b = 4;
   console.log(a * b);
4. 4.⚡ Which JavaScript word runs code when true? (a) for (b) let (c) if (d) alert()
5. 5.⚡ Which JavaScript word shows a pop-up box? (a) let (b) for (c) alert() (d) console.log()
6. 6.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the title bar (d) on the printer
7. 7.⚡ What number does this code print?
   let a = 28;
   let b = 6;
   console.log(a - b);
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 9;
   console.log(x + y); (a) 10 (b) Error (c) 19
9. 9.⚡ Which word makes a new variable? (a) make (b) give (c) put (d) let
10. 10.⚡ What does alert() show? (a) a new tab (b) a picture (c) a pop-up box (d) a table
11. 11.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <script> (d) <style>
12. 12.⚡ What number does this code print?
    let apples = 7;
    apples = apples + 10;
    apples = apples - 2;
    console.log(apples);
13. 13.⚡ Which JavaScript word repeats code? (a) if (b) console.log() (c) alert() (d) for
14. 14.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Arjun! (c) name (d) Arjun
15. 15.⚡ What number does this code print?
    let score = 8;
    score = score + 7;
    score = score - 15;
    console.log(score);
16. 16.⚡ What number does this code print?
    let books = 17;
    books = books + 7;
    books = books - 1;
    console.log(books);
17. 17.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) for (d) let
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 6 (b) Error (c) 33
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y); (a) 57 (b) Error (c) 12
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) 15 (b) Error (c) 6
21. 21.⚡ What number does this code print?
    let a = 2;
    let b = 10;
    console.log(a * b);
22. 22.⚡ What number does this code print?
    let coins = 29;
    coins = coins + 7;
    coins = coins - 8;
    console.log(coins);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) 10 (b) 64 (c) Error
24. 24.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Welcome, Arjun! (b) Arjun (c) Welcome, name! (d) name
25. 25.⚡ What number does this code print?
    let a = 19;
    let b = 40;
    console.log(a + b);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) Error (b) 7 (c) 25
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) Error (b) 4 (c) 13
28. 28.⚡ Which JavaScript word writes in the console? (a) console.log() (b) let (c) if (d) for
29. 29.⚡ What number does this code print?
    let a = 20;
    let b = 6;
    console.log(a - b);
30. 30.⚡ What number does this code print?
    let a = 32;
    let b = 25;
    console.log(a + b);
31. 31.⚡ What number does this code print?
    let a = 11;
    let b = 20;
    console.log(a + b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) 11 (b) Error (c) 29
33. 33.⚡ What number does this code print?
    let a = 36;
    let b = 28;
    console.log(a + b);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 9 (b) 81 (c) Error
35. 35.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Riya (b) name (c) Well done, name! (d) Well done, Riya!
36. 36.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) name (b) Riya (c) Welcome, Riya! (d) Welcome, name!
37. 37.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Zoya (c) name (d) Welcome, Zoya!
38. 38.⚡ What number does this code print?
    let a = 9;
    let b = 5;
    console.log(a * b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) 42 (b) 6 (c) Error
40. 40.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Kabir (c) name (d) Hello, Kabir!

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