JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 437 · 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) name (b) Well done, name! (c) Well done, Zoya! (d) Zoya
2. 2.⚡ Which JavaScript word writes in the console? (a) alert() (b) let (c) if (d) console.log()
3. 3.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) for (d) alert()
4. 4.⚡ What does this code show?
   let name = "Arjun";
   alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Arjun (c) name (d) Welcome, Arjun!
5. 5.⚡ Which JavaScript word runs code when true? (a) console.log() (b) for (c) if (d) alert()
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 8;
   console.log(x + y); (a) Error (b) 28 (c) 10
7. 7.⚡ What does this code show?
   let name = "Arjun";
   alert("Well done, " + name + "!"); (a) Well done, name! (b) Arjun (c) name (d) Well done, Arjun!
8. 8.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .js (d) .jpg
9. 9.⚡ What number does this code print?
   let a = 35;
   let b = 24;
   console.log(a - b);
10. 10.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) let (c) for (d) alert()
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 9;
    console.log(x + y); (a) Error (b) 16 (c) 79
12. 12.⚡ What number does this code print?
    let a = 51;
    let b = 30;
    console.log(a - b);
13. 13.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) if (d) let
14. 14.⚡ Which word makes a new variable? (a) put (b) make (c) give (d) let
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) Error (b) 43 (c) 7
16. 16.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 12;
    apples = apples - 12;
    console.log(apples);
17. 17.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 12;
    apples = apples - 4;
    console.log(apples);
18. 18.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Riya! (c) Hi, name! (d) Riya
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) Error (b) 58 (c) 13
20. 20.⚡ What number does this code print?
    let a = 3;
    let b = 4;
    console.log(a * b);
21. 21.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) name (b) Zoya (c) Hello, Zoya! (d) Hello, name!
22. 22.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <js> (d) <code>
23. 23.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Arjun! (c) Arjun (d) name
24. 24.⚡ 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
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) Error (b) 11 (c) 29
26. 26.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Kabir (d) Well done, Kabir!
27. 27.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a picture (d) a table
28. 28.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) in the address bar (d) on the title bar
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) 13 (b) 85 (c) Error
30. 30.⚡ What number does this code print?
    let books = 17;
    books = books + 3;
    books = books - 8;
    console.log(books);
31. 31.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, Meera! (b) Meera (c) Well done, name! (d) name
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) Error (b) 38 (c) 11
33. 33.⚡ What number does this code print?
    let runs = 14;
    runs = runs + 8;
    runs = runs - 15;
    console.log(runs);
34. 34.⚡ What number does this code print?
    let a = 30;
    let b = 2;
    console.log(a - b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) Error (b) 10 (c) 19
36. 36.⚡ What number does this code print?
    let a = 3;
    let b = 10;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let score = 8;
    score = score + 10;
    score = score - 7;
    console.log(score);
38. 38.⚡ What number does this code print?
    let a = 10;
    let b = 11;
    console.log(a * b);
39. 39.⚡ What number does this code print?
    let a = 39;
    let b = 37;
    console.log(a - b);
40. 40.⚡ What number does this code print?
    let a = 20;
    let b = 32;
    console.log(a + b);

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