JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 182 · 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 number does this code print?
   let a = 6;
   let b = 4;
   console.log(a * b);
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 7;
   console.log(x + y); (a) 87 (b) 15 (c) Error
3. 3.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a picture (d) a new tab
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 5;
   console.log(x + y); (a) Error (b) 6 (c) 15
5. 5.⚡ What number does this code print?
   let a = 57;
   let b = 1;
   console.log(a + b);
6. 6.⚡ What number does this code print?
   let score = 17;
   score = score + 7;
   score = score - 23;
   console.log(score);
7. 7.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <script> (d) <js>
8. 8.⚡ What number does this code print?
   let books = 11;
   books = books + 6;
   books = books - 16;
   console.log(books);
9. 9.⚡ What number does this code print?
   let a = 8;
   let b = 6;
   console.log(a * b);
10. 10.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Riya (b) name (c) Well done, Riya! (d) Well done, name!
11. 11.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) if (d) let
12. 12.⚡ Which JavaScript word writes in the console? (a) console.log() (b) if (c) for (d) let
13. 13.⚡ What number does this code print?
    let a = 17;
    let b = 21;
    console.log(a + b);
14. 14.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Zoya! (c) Welcome, name! (d) Zoya
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) Error (b) 14 (c) 5
16. 16.⚡ Which word makes a new variable? (a) put (b) let (c) make (d) give
17. 17.⚡ What number does this code print?
    let a = 4;
    let b = 7;
    console.log(a * b);
18. 18.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) console.log() (d) for
19. 19.⚡ 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
20. 20.⚡ Which JavaScript word makes a new variable? (a) if (b) alert() (c) console.log() (d) let
21. 21.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Zoya (b) Well done, Zoya! (c) name (d) Well done, name!
22. 22.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Arjun! (c) name (d) Arjun
23. 23.⚡ Which JavaScript word runs code when true? (a) console.log() (b) if (c) for (d) alert()
24. 24.⚡ What number does this code print?
    let a = 27;
    let b = 5;
    console.log(a - b);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) 96 (b) Error (c) 15
26. 26.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 19;
    apples = apples - 24;
    console.log(apples);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) Error (b) 16 (c) 97
28. 28.⚡ What number does this code print?
    let a = 9;
    let b = 10;
    console.log(a * b);
29. 29.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Riya (b) Welcome, name! (c) name (d) Welcome, Riya!
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 7 (b) Error (c) 43
31. 31.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) name (c) Hello, Aman! (d) Hello, name!
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) 10 (b) 46 (c) Error
33. 33.⚡ What number does this code print?
    let a = 26;
    let b = 28;
    console.log(a + b);
34. 34.⚡ What number does this code print?
    let coins = 20;
    coins = coins + 18;
    coins = coins - 24;
    console.log(coins);
35. 35.⚡ What number does this code print?
    let a = 11;
    let b = 12;
    console.log(a * b);
36. 36.⚡ What number does this code print?
    let a = 20;
    let b = 8;
    console.log(a + b);
37. 37.⚡ What number does this code print?
    let a = 12;
    let b = 10;
    console.log(a * b);
38. 38.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Hi, Arjun! (b) Hi, name! (c) Arjun (d) name
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) Error (b) 72 (c) 9
40. 40.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Kabir (b) Hello, name! (c) name (d) Hello, Kabir!

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