JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 92 · 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 = "3";
   let y = 8;
   console.log(x + y); (a) 38 (b) 11 (c) Error
2. 2.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <js> (d) <script>
3. 3.⚡ What does this code show?
   let name = "Aman";
   console.log("Well done, " + name + "!"); (a) Aman (b) Well done, Aman! (c) Well done, name! (d) name
4. 4.⚡ What does this code show?
   let name = "Riya";
   console.log("Hi, " + name + "!"); (a) name (b) Hi, Riya! (c) Hi, name! (d) Riya
5. 5.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .css (d) .js
6. 6.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) for (d) alert()
7. 7.⚡ What does this code show?
   let name = "Meera";
   alert("Hi, " + name + "!"); (a) name (b) Hi, Meera! (c) Meera (d) Hi, name!
8. 8.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) alert() (d) if
9. 9.⚡ What number does this code print?
   let coins = 13;
   coins = coins + 13;
   coins = coins - 2;
   console.log(coins);
10. 10.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a new tab (d) a picture
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 9 (b) Error (c) 81
12. 12.⚡ What number does this code print?
    let a = 44;
    let b = 22;
    console.log(a + b);
13. 13.⚡ Which JavaScript word writes in the console? (a) let (b) console.log() (c) for (d) if
14. 14.⚡ What number does this code print?
    let coins = 19;
    coins = coins + 9;
    coins = coins - 13;
    console.log(coins);
15. 15.⚡ What number does this code print?
    let score = 12;
    score = score + 8;
    score = score - 11;
    console.log(score);
16. 16.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Meera! (c) Meera (d) Hi, name!
17. 17.⚡ What number does this code print?
    let a = 10;
    let b = 6;
    console.log(a * b);
18. 18.⚡ What number does this code print?
    let a = 53;
    let b = 19;
    console.log(a + b);
19. 19.⚡ What number does this code print?
    let a = 4;
    let b = 6;
    console.log(a * b);
20. 20.⚡ What number does this code print?
    let a = 29;
    let b = 23;
    console.log(a - b);
21. 21.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, Aman! (b) Hi, name! (c) Aman (d) name
22. 22.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) name (b) Aman (c) Hi, name! (d) Hi, Aman!
23. 23.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) the domain name (d) only colours
24. 24.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Zoya (d) Welcome, Zoya!
25. 25.⚡ What number does this code print?
    let books = 13;
    books = books + 5;
    books = books - 17;
    console.log(books);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) Error (b) 34 (c) 7
27. 27.⚡ What number does this code print?
    let runs = 12;
    runs = runs + 14;
    runs = runs - 6;
    console.log(runs);
28. 28.⚡ Which word makes a new variable? (a) give (b) put (c) let (d) make
29. 29.⚡ What number does this code print?
    let a = 10;
    let b = 6;
    console.log(a + b);
30. 30.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Kabir! (d) Kabir
31. 31.⚡ What number does this code print?
    let a = 2;
    let b = 4;
    console.log(a * b);
32. 32.⚡ What number does this code print?
    let coins = 18;
    coins = coins + 17;
    coins = coins - 12;
    console.log(coins);
33. 33.⚡ Where does console.log() show its output? (a) in the console (b) on the title bar (c) in the address bar (d) on the printer
34. 34.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, Zoya! (b) name (c) Zoya (d) Hello, name!
35. 35.⚡ What number does this code print?
    let a = 38;
    let b = 19;
    console.log(a - b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) 5 (b) 23 (c) Error
37. 37.⚡ What number does this code print?
    let a = 56;
    let b = 19;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let score = 30;
    score = score + 7;
    score = score - 33;
    console.log(score);
39. 39.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Hi, Arjun! (b) name (c) Arjun (d) Hi, name!
40. 40.⚡ What number does this code print?
    let a = 33;
    let b = 33;
    console.log(a - b);

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