JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 44 · 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 alert() show? (a) a pop-up box (b) a new tab (c) a picture (d) a table
2. 2.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) let (d) console.log()
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 5;
   console.log(x + y); (a) 13 (b) Error (c) 85
4. 4.⚡ What number does this code print?
   let books = 21;
   books = books + 19;
   books = books - 33;
   console.log(books);
5. 5.⚡ What does this code show?
   let name = "Riya";
   console.log("Well done, " + name + "!"); (a) Well done, Riya! (b) name (c) Riya (d) Well done, name!
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 6;
   console.log(x + y); (a) 46 (b) Error (c) 10
7. 7.⚡ What number does this code print?
   let a = 17;
   let b = 12;
   console.log(a - b);
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 2;
   console.log(x + y); (a) Error (b) 32 (c) 5
9. 9.⚡ Which word makes a new variable? (a) put (b) make (c) give (d) let
10. 10.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) for (d) alert()
11. 11.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) if (d) for
12. 12.⚡ What number does this code print?
    let a = 12;
    let b = 4;
    console.log(a * b);
13. 13.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Riya (b) name (c) Hi, name! (d) Hi, Riya!
14. 14.⚡ What number does this code print?
    let score = 16;
    score = score + 14;
    score = score - 8;
    console.log(score);
15. 15.⚡ What number does this code print?
    let a = 21;
    let b = 20;
    console.log(a + b);
16. 16.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) let (d) for
17. 17.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Aman (c) Hello, Aman! (d) Hello, name!
18. 18.⚡ What number does this code print?
    let a = 13;
    let b = 4;
    console.log(a - b);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y); (a) Error (b) 93 (c) 12
20. 20.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Aman! (d) Aman
21. 21.⚡ Which JavaScript word repeats code? (a) if (b) let (c) for (d) console.log()
22. 22.⚡ What number does this code print?
    let coins = 19;
    coins = coins + 15;
    coins = coins - 24;
    console.log(coins);
23. 23.⚡ What number does this code print?
    let score = 23;
    score = score + 2;
    score = score - 1;
    console.log(score);
24. 24.⚡ What number does this code print?
    let a = 18;
    let b = 5;
    console.log(a - b);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) Error (b) 12 (c) 39
26. 26.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) name (b) Riya (c) Welcome, name! (d) Welcome, Riya!
27. 27.⚡ What number does this code print?
    let a = 7;
    let b = 12;
    console.log(a * b);
28. 28.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 2;
    apples = apples - 5;
    console.log(apples);
29. 29.⚡ What number does this code print?
    let books = 25;
    books = books + 20;
    books = books - 29;
    console.log(books);
30. 30.⚡ What number does this code print?
    let a = 48;
    let b = 21;
    console.log(a + b);
31. 31.⚡ What number does this code print?
    let a = 12;
    let b = 5;
    console.log(a * b);
32. 32.⚡ What number does this code print?
    let coins = 10;
    coins = coins + 5;
    coins = coins - 13;
    console.log(coins);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) Error (b) 36 (c) 9
34. 34.⚡ What number does this code print?
    let a = 54;
    let b = 6;
    console.log(a - b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) Error (b) 11 (c) 29
36. 36.⚡ What number does this code print?
    let a = 37;
    let b = 10;
    console.log(a - b);
37. 37.⚡ What number does this code print?
    let a = 58;
    let b = 2;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let a = 40;
    let b = 23;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let a = 7;
    let b = 40;
    console.log(a + b);
40. 40.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Arjun (b) name (c) Hi, name! (d) Hi, Arjun!

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