JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 606 · 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) console.log() (b) let (c) alert() (d) if
2. 2.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) for (d) alert()
3. 3.⚡ What does this code show?
   let name = "Arjun";
   alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Arjun! (d) Arjun
4. 4.⚡ Which word makes a new variable? (a) put (b) let (c) give (d) make
5. 5.⚡ What does this code show?
   let name = "Arjun";
   console.log("Well done, " + name + "!"); (a) name (b) Well done, Arjun! (c) Well done, name! (d) Arjun
6. 6.⚡ What number does this code print?
   let books = 26;
   books = books + 16;
   books = books - 23;
   console.log(books);
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 9;
   console.log(x + y); (a) Error (b) 10 (c) 19
8. 8.⚡ What number does this code print?
   let coins = 13;
   coins = coins + 4;
   coins = coins - 3;
   console.log(coins);
9. 9.⚡ Which JavaScript word writes in the console? (a) alert() (b) if (c) console.log() (d) for
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) Error (b) 10 (c) 91
11. 11.⚡ Which JavaScript word repeats code? (a) console.log() (b) let (c) for (d) alert()
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) 11 (b) Error (c) 83
13. 13.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) on the title bar (d) in the address bar
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 3 (b) Error (c) 12
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) Error (b) 6 (c) 42
16. 16.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Riya! (c) name (d) Riya
17. 17.⚡ What number does this code print?
    let a = 8;
    let b = 3;
    console.log(a * b);
18. 18.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Riya (d) Hello, Riya!
19. 19.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) if (d) let
20. 20.⚡ What number does this code print?
    let a = 56;
    let b = 9;
    console.log(a - b);
21. 21.⚡ What number does this code print?
    let books = 23;
    books = books + 20;
    books = books - 1;
    console.log(books);
22. 22.⚡ What number does this code print?
    let score = 28;
    score = score + 4;
    score = score - 23;
    console.log(score);
23. 23.⚡ What number does this code print?
    let score = 18;
    score = score + 16;
    score = score - 26;
    console.log(score);
24. 24.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Well done, Zoya! (b) Zoya (c) Well done, name! (d) name
25. 25.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, Zoya! (b) Zoya (c) name (d) Hi, name!
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) 69 (b) 15 (c) Error
27. 27.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .jpg (d) .js
28. 28.⚡ What number does this code print?
    let a = 10;
    let b = 11;
    console.log(a * b);
29. 29.⚡ What number does this code print?
    let a = 9;
    let b = 15;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let coins = 29;
    coins = coins + 20;
    coins = coins - 40;
    console.log(coins);
31. 31.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Meera! (c) Meera (d) name
32. 32.⚡ What number does this code print?
    let apples = 15;
    apples = apples + 8;
    apples = apples - 4;
    console.log(apples);
33. 33.⚡ What number does this code print?
    let books = 10;
    books = books + 3;
    books = books - 12;
    console.log(books);
34. 34.⚡ What number does this code print?
    let score = 8;
    score = score + 6;
    score = score - 1;
    console.log(score);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) Error (b) 3 (c) 21
36. 36.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Kabir (b) name (c) Hello, name! (d) Hello, Kabir!
37. 37.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Riya (b) Well done, Riya! (c) Well done, name! (d) name
38. 38.⚡ What number does this code print?
    let a = 24;
    let b = 10;
    console.log(a - b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y); (a) 17 (b) 98 (c) Error
40. 40.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Kabir (d) Hi, Kabir!

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