JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 107 · 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 = "Arjun";
   alert("Hi, " + name + "!"); (a) Hi, name! (b) Arjun (c) name (d) Hi, Arjun!
2. 2.⚡ What does this code show?
   let name = "Riya";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Riya (c) Hello, Riya! (d) name
3. 3.⚡ What number does this code print?
   let score = 18;
   score = score + 13;
   score = score - 10;
   console.log(score);
4. 4.⚡ Which JavaScript word repeats code? (a) for (b) let (c) if (d) console.log()
5. 5.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <style> (d) <script>
6. 6.⚡ What does this code show?
   let name = "Aman";
   alert("Welcome, " + name + "!"); (a) Welcome, Aman! (b) Aman (c) Welcome, name! (d) name
7. 7.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hi, " + name + "!"); (a) Kabir (b) Hi, name! (c) Hi, Kabir! (d) name
8. 8.⚡ What number does this code print?
   let a = 24;
   let b = 28;
   console.log(a + b);
9. 9.⚡ Which JavaScript word makes a new variable? (a) if (b) for (c) let (d) console.log()
10. 10.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Arjun (b) Welcome, name! (c) Welcome, Arjun! (d) name
11. 11.⚡ Which word makes a new variable? (a) put (b) let (c) give (d) make
12. 12.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Meera! (c) Hello, name! (d) Meera
13. 13.⚡ What does alert() show? (a) a table (b) a new tab (c) a pop-up box (d) a picture
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) Error (b) 14 (c) 77
15. 15.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 11;
    apples = apples - 12;
    console.log(apples);
16. 16.⚡ What number does this code print?
    let score = 30;
    score = score + 20;
    score = score - 24;
    console.log(score);
17. 17.⚡ What number does this code print?
    let a = 17;
    let b = 8;
    console.log(a - b);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 35 (b) 8 (c) Error
19. 19.⚡ Which JavaScript word runs code when true? (a) if (b) console.log() (c) for (d) let
20. 20.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) on the printer (d) in the console
21. 21.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 7;
    apples = apples - 10;
    console.log(apples);
22. 22.⚡ What number does this code print?
    let books = 22;
    books = books + 8;
    books = books - 16;
    console.log(books);
23. 23.⚡ What number does this code print?
    let a = 46;
    let b = 13;
    console.log(a + b);
24. 24.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Riya (b) Hi, name! (c) Hi, Riya! (d) name
25. 25.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Aman! (c) name (d) Aman
26. 26.⚡ What number does this code print?
    let a = 58;
    let b = 32;
    console.log(a - b);
27. 27.⚡ Which JavaScript word writes in the console? (a) alert() (b) if (c) console.log() (d) let
28. 28.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Kabir! (d) Kabir
29. 29.⚡ What number does this code print?
    let a = 40;
    let b = 25;
    console.log(a - b);
30. 30.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
31. 31.⚡ What number does this code print?
    let coins = 26;
    coins = coins + 16;
    coins = coins - 31;
    console.log(coins);
32. 32.⚡ What number does this code print?
    let a = 12;
    let b = 7;
    console.log(a - b);
33. 33.⚡ What number does this code print?
    let a = 35;
    let b = 29;
    console.log(a + b);
34. 34.⚡ What number does this code print?
    let runs = 19;
    runs = runs + 3;
    runs = runs - 13;
    console.log(runs);
35. 35.⚡ What number does this code print?
    let books = 8;
    books = books + 20;
    books = books - 7;
    console.log(books);
36. 36.⚡ What number does this code print?
    let coins = 10;
    coins = coins + 15;
    coins = coins - 2;
    console.log(coins);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) 7 (b) Error (c) 25
38. 38.⚡ What number does this code print?
    let a = 48;
    let b = 32;
    console.log(a - b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) Error (b) 13 (c) 4
40. 40.⚡ What number does this code print?
    let runs = 11;
    runs = runs + 8;
    runs = runs - 10;
    console.log(runs);

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