JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 65 · 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 = 22;
   let b = 7;
   console.log(a - b);
2. 2.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) console.log() (d) alert()
3. 3.⚡ 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
4. 4.⚡ Which JavaScript word writes in the console? (a) for (b) if (c) console.log() (d) alert()
5. 5.⚡ Which word makes a new variable? (a) put (b) make (c) let (d) give
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 4;
   console.log(x + y); (a) 9 (b) Error (c) 54
7. 7.⚡ What does this code show?
   let name = "Riya";
   console.log("Well done, " + name + "!"); (a) Well done, name! (b) Riya (c) name (d) Well done, Riya!
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 3;
   console.log(x + y); (a) 10 (b) Error (c) 73
9. 9.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .jpg (d) .js
10. 10.⚡ 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
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 4;
    console.log(x + y); (a) Error (b) 84 (c) 12
12. 12.⚡ What number does this code print?
    let a = 35;
    let b = 13;
    console.log(a + b);
13. 13.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) alert() (d) let
14. 14.⚡ What number does this code print?
    let coins = 27;
    coins = coins + 20;
    coins = coins - 27;
    console.log(coins);
15. 15.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Meera (b) name (c) Hello, Meera! (d) Hello, name!
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 9 (b) 81 (c) Error
17. 17.⚡ What number does this code print?
    let marks = 13;
    marks = marks + 9;
    marks = marks - 14;
    console.log(marks);
18. 18.⚡ What does alert() show? (a) a new tab (b) a picture (c) a table (d) a pop-up box
19. 19.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, Riya! (b) name (c) Hello, name! (d) Riya
20. 20.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, Kabir! (b) Well done, name! (c) Kabir (d) name
21. 21.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Zoya (c) name (d) Hi, Zoya!
22. 22.⚡ What number does this code print?
    let a = 21;
    let b = 21;
    console.log(a - b);
23. 23.⚡ What number does this code print?
    let a = 14;
    let b = 8;
    console.log(a - b);
24. 24.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Aman! (c) Aman (d) name
25. 25.⚡ Which JavaScript word repeats code? (a) let (b) alert() (c) console.log() (d) for
26. 26.⚡ What number does this code print?
    let runs = 14;
    runs = runs + 16;
    runs = runs - 4;
    console.log(runs);
27. 27.⚡ What number does this code print?
    let apples = 16;
    apples = apples + 6;
    apples = apples - 4;
    console.log(apples);
28. 28.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Aman! (d) Aman
29. 29.⚡ What number does this code print?
    let a = 47;
    let b = 18;
    console.log(a - b);
30. 30.⚡ What number does this code print?
    let a = 5;
    let b = 7;
    console.log(a * b);
31. 31.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <style> (d) <code>
32. 32.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Kabir (d) Welcome, Kabir!
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) Error (b) 95 (c) 14
34. 34.⚡ What number does this code print?
    let a = 29;
    let b = 33;
    console.log(a + b);
35. 35.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Riya! (c) name (d) Riya
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) 9 (b) 27 (c) Error
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) 11 (b) Error (c) 29
38. 38.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Hi, Zoya! (b) name (c) Zoya (d) Hi, name!
39. 39.⚡ What number does this code print?
    let a = 32;
    let b = 4;
    console.log(a - b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) 15 (b) 96 (c) Error

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