JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 865 · 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 = 5;
   console.log(a + b);
2. 2.⚡ Which JavaScript word writes in the console? (a) alert() (b) for (c) let (d) console.log()
3. 3.⚡ What number does this code print?
   let coins = 8;
   coins = coins + 7;
   coins = coins - 9;
   console.log(coins);
4. 4.⚡ Which JavaScript word makes a new variable? (a) if (b) console.log() (c) let (d) for
5. 5.⚡ Which JavaScript word repeats code? (a) alert() (b) if (c) for (d) console.log()
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 1;
   console.log(x + y); (a) 51 (b) 6 (c) Error
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 4;
   console.log(x + y); (a) 24 (b) Error (c) 6
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 2;
   console.log(x + y); (a) Error (b) 82 (c) 10
9. 9.⚡ What number does this code print?
   let a = 23;
   let b = 5;
   console.log(a + b);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y); (a) 9 (b) 45 (c) Error
11. 11.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Riya! (c) Hi, name! (d) Riya
12. 12.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) on the title bar (d) in the address bar
13. 13.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
14. 14.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Meera (b) Welcome, Meera! (c) name (d) Welcome, name!
15. 15.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, Aman! (b) Aman (c) name (d) Welcome, name!
16. 16.⚡ What number does this code print?
    let a = 21;
    let b = 14;
    console.log(a - b);
17. 17.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Kabir (b) name (c) Hello, Kabir! (d) Hello, name!
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 81 (b) Error (c) 9
19. 19.⚡ What number does this code print?
    let coins = 14;
    coins = coins + 8;
    coins = coins - 3;
    console.log(coins);
20. 20.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Zoya! (d) Zoya
21. 21.⚡ Which word makes a new variable? (a) put (b) let (c) give (d) make
22. 22.⚡ What number does this code print?
    let marks = 21;
    marks = marks + 9;
    marks = marks - 25;
    console.log(marks);
23. 23.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) for (c) console.log() (d) let
24. 24.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Aman! (c) Aman (d) Hi, name!
25. 25.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .js (d) .jpg
26. 26.⚡ What number does this code print?
    let a = 10;
    let b = 3;
    console.log(a * b);
27. 27.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Kabir (b) Hello, name! (c) name (d) Hello, Kabir!
28. 28.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <code> (d) <style>
29. 29.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, Meera! (b) name (c) Hello, name! (d) Meera
30. 30.⚡ What number does this code print?
    let coins = 8;
    coins = coins + 12;
    coins = coins - 2;
    console.log(coins);
31. 31.⚡ What number does this code print?
    let marks = 27;
    marks = marks + 20;
    marks = marks - 3;
    console.log(marks);
32. 32.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 17;
    apples = apples - 5;
    console.log(apples);
33. 33.⚡ What number does this code print?
    let coins = 27;
    coins = coins + 20;
    coins = coins - 25;
    console.log(coins);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 12 (b) Error (c) 3
35. 35.⚡ What number does this code print?
    let a = 8;
    let b = 2;
    console.log(a * b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) 69 (b) Error (c) 15
37. 37.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Meera (b) Hello, Meera! (c) name (d) Hello, name!
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) Error (b) 37 (c) 10
39. 39.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Well done, Zoya! (b) name (c) Zoya (d) Well done, name!
40. 40.⚡ What number does this code print?
    let a = 51;
    let b = 32;
    console.log(a + b);

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