JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 238 · 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 word makes a new variable? (a) let (b) give (c) put (d) make
2. 2.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <js> (d) <code>
3. 3.⚡ What does this code show?
   let name = "Kabir";
   console.log("Welcome, " + name + "!"); (a) Kabir (b) Welcome, name! (c) name (d) Welcome, Kabir!
4. 4.⚡ What does this code show?
   let name = "Meera";
   alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Meera! (c) Meera (d) name
5. 5.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Zoya (c) Hello, Zoya! (d) name
6. 6.⚡ Which JavaScript word makes a new variable? (a) for (b) console.log() (c) if (d) let
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 2;
   console.log(x + y); (a) 4 (b) Error (c) 22
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 1;
   console.log(x + y); (a) 51 (b) Error (c) 6
9. 9.⚡ What number does this code print?
   let a = 14;
   let b = 37;
   console.log(a + b);
10. 10.⚡ Which JavaScript word writes in the console? (a) for (b) if (c) console.log() (d) alert()
11. 11.⚡ What number does this code print?
    let a = 10;
    let b = 9;
    console.log(a * b);
12. 12.⚡ What number does this code print?
    let books = 14;
    books = books + 3;
    books = books - 14;
    console.log(books);
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) 52 (b) Error (c) 7
14. 14.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) on the printer (d) in the address bar
15. 15.⚡ 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
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) 11 (b) Error (c) 92
17. 17.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .js (d) .jpg
18. 18.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Arjun (b) Hello, Arjun! (c) name (d) Hello, name!
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) 18 (b) Error (c) 9
20. 20.⚡ What number does this code print?
    let a = 32;
    let b = 16;
    console.log(a + b);
21. 21.⚡ What number does this code print?
    let score = 8;
    score = score + 10;
    score = score - 4;
    console.log(score);
22. 22.⚡ What number does this code print?
    let a = 10;
    let b = 10;
    console.log(a * b);
23. 23.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) Hello, Aman! (c) Hello, name! (d) name
24. 24.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) if (d) let
25. 25.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Zoya (b) Hello, name! (c) name (d) Hello, Zoya!
26. 26.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Zoya! (c) Welcome, name! (d) Zoya
27. 27.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Kabir (b) name (c) Welcome, Kabir! (d) Welcome, name!
28. 28.⚡ What number does this code print?
    let coins = 30;
    coins = coins + 12;
    coins = coins - 13;
    console.log(coins);
29. 29.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Aman (c) Hi, Aman! (d) name
30. 30.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a new tab (d) a picture
31. 31.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, Meera! (b) Meera (c) name (d) Hello, name!
32. 32.⚡ What number does this code print?
    let a = 9;
    let b = 3;
    console.log(a * b);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) Error (b) 96 (c) 15
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 4;
    console.log(x + y); (a) 12 (b) 84 (c) Error
35. 35.⚡ What number does this code print?
    let a = 6;
    let b = 16;
    console.log(a + b);
36. 36.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) name (b) Well done, Aman! (c) Well done, name! (d) Aman
37. 37.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Aman (b) Well done, name! (c) Well done, Aman! (d) name
38. 38.⚡ What number does this code print?
    let runs = 20;
    runs = runs + 3;
    runs = runs - 20;
    console.log(runs);
39. 39.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Aman (c) Welcome, Aman! (d) name
40. 40.⚡ What number does this code print?
    let a = 12;
    let b = 34;
    console.log(a + b);

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