JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 520 · 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 show?
   let name = "Zoya";
   console.log("Well done, " + name + "!"); (a) Well done, Zoya! (b) name (c) Zoya (d) Well done, name!
2. 2.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) console.log() (d) let
3. 3.⚡ Which JavaScript word shows a pop-up box? (a) for (b) if (c) let (d) alert()
4. 4.⚡ What does this code show?
   let name = "Aman";
   alert("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) name (d) Hello, Aman!
5. 5.⚡ What does this code show?
   let name = "Riya";
   console.log("Well done, " + name + "!"); (a) Well done, Riya! (b) name (c) Well done, name! (d) Riya
6. 6.⚡ What number does this code print?
   let apples = 5;
   apples = apples + 18;
   apples = apples - 2;
   console.log(apples);
7. 7.⚡ What number does this code print?
   let a = 6;
   let b = 9;
   console.log(a * b);
8. 8.⚡ What number does this code print?
   let runs = 15;
   runs = runs + 3;
   runs = runs - 17;
   console.log(runs);
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 2;
   console.log(x + y); (a) 82 (b) Error (c) 10
10. 10.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, Zoya! (b) name (c) Hello, name! (d) Zoya
11. 11.⚡ What number does this code print?
    let books = 25;
    books = books + 16;
    books = books - 3;
    console.log(books);
12. 12.⚡ What number does this code print?
    let a = 7;
    let b = 5;
    console.log(a - b);
13. 13.⚡ What number does this code print?
    let a = 3;
    let b = 11;
    console.log(a * b);
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) 15 (b) 87 (c) Error
15. 15.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <js> (d) <code>
16. 16.⚡ What number does this code print?
    let a = 7;
    let b = 9;
    console.log(a * b);
17. 17.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Aman! (c) name (d) Aman
18. 18.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Arjun! (d) Arjun
19. 19.⚡ What number does this code print?
    let a = 4;
    let b = 6;
    console.log(a * b);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) Error (b) 2 (c) 11
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 9;
    console.log(x + y); (a) Error (b) 79 (c) 16
22. 22.⚡ Which word makes a new variable? (a) let (b) make (c) put (d) give
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) Error (b) 8 (c) 53
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) Error (b) 73 (c) 10
25. 25.⚡ What number does this code print?
    let apples = 7;
    apples = apples + 6;
    apples = apples - 10;
    console.log(apples);
26. 26.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Zoya (b) Welcome, Zoya! (c) Welcome, name! (d) name
27. 27.⚡ What number does this code print?
    let apples = 9;
    apples = apples + 20;
    apples = apples - 23;
    console.log(apples);
28. 28.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Riya (b) Hi, name! (c) Hi, Riya! (d) name
29. 29.⚡ Which JavaScript word writes in the console? (a) console.log() (b) if (c) let (d) for
30. 30.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Riya! (d) Riya
31. 31.⚡ What number does this code print?
    let books = 22;
    books = books + 8;
    books = books - 14;
    console.log(books);
32. 32.⚡ What number does this code print?
    let a = 2;
    let b = 3;
    console.log(a * b);
33. 33.⚡ What number does this code print?
    let runs = 11;
    runs = runs + 14;
    runs = runs - 6;
    console.log(runs);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) 25 (b) 7 (c) Error
35. 35.⚡ What number does this code print?
    let books = 11;
    books = books + 9;
    books = books - 20;
    console.log(books);
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 = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Meera (c) Hi, Meera! (d) name
38. 38.⚡ What number does this code print?
    let a = 28;
    let b = 3;
    console.log(a + b);
39. 39.⚡ What does alert() show? (a) a table (b) a new tab (c) a pop-up box (d) a picture
40. 40.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 10;
    runs = runs - 10;
    console.log(runs);

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