JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 587 · 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 JavaScript word makes a new variable? (a) alert() (b) for (c) let (d) console.log()
2. 2.⚡ What number does this code print?
   let apples = 27;
   apples = apples + 9;
   apples = apples - 16;
   console.log(apples);
3. 3.⚡ Which JavaScript word repeats code? (a) let (b) alert() (c) for (d) console.log()
4. 4.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
5. 5.⚡ What number does this code print?
   let a = 40;
   let b = 29;
   console.log(a - b);
6. 6.⚡ What number does this code print?
   let coins = 8;
   coins = coins + 7;
   coins = coins - 5;
   console.log(coins);
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 6;
   console.log(x + y); (a) Error (b) 11 (c) 56
8. 8.⚡ What does this code show?
   let name = "Zoya";
   alert("Hello, " + name + "!"); (a) Hello, Zoya! (b) name (c) Zoya (d) Hello, name!
9. 9.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) for (d) console.log()
10. 10.⚡ What number does this code print?
    let coins = 13;
    coins = coins + 11;
    coins = coins - 9;
    console.log(coins);
11. 11.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <code> (d) <script>
12. 12.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Meera (b) Welcome, Meera! (c) name (d) Welcome, name!
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) 7 (b) Error (c) 61
14. 14.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) name (b) Kabir (c) Hi, name! (d) Hi, Kabir!
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 9;
    console.log(x + y); (a) 14 (b) Error (c) 59
16. 16.⚡ What number does this code print?
    let a = 15;
    let b = 32;
    console.log(a + b);
17. 17.⚡ What number does this code print?
    let books = 24;
    books = books + 15;
    books = books - 1;
    console.log(books);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) 10 (b) 55 (c) Error
19. 19.⚡ What number does this code print?
    let score = 19;
    score = score + 2;
    score = score - 10;
    console.log(score);
20. 20.⚡ What number does this code print?
    let runs = 28;
    runs = runs + 20;
    runs = runs - 29;
    console.log(runs);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) 10 (b) 37 (c) Error
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) 2 (b) 11 (c) Error
23. 23.⚡ What number does this code print?
    let score = 13;
    score = score + 8;
    score = score - 6;
    console.log(score);
24. 24.⚡ Which JavaScript word writes in the console? (a) for (b) let (c) console.log() (d) if
25. 25.⚡ What number does this code print?
    let a = 2;
    let b = 12;
    console.log(a * b);
26. 26.⚡ What number does this code print?
    let a = 60;
    let b = 11;
    console.log(a + b);
27. 27.⚡ What number does this code print?
    let a = 23;
    let b = 13;
    console.log(a + b);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) Error (b) 6 (c) 24
29. 29.⚡ What number does this code print?
    let apples = 7;
    apples = apples + 4;
    apples = apples - 4;
    console.log(apples);
30. 30.⚡ What number does this code print?
    let a = 36;
    let b = 1;
    console.log(a - b);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) Error (b) 19 (c) 10
32. 32.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a picture (d) a table
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) Error (b) 32 (c) 5
34. 34.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) name (b) Riya (c) Welcome, Riya! (d) Welcome, name!
35. 35.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 15;
    apples = apples - 19;
    console.log(apples);
36. 36.⚡ What number does this code print?
    let books = 6;
    books = books + 18;
    books = books - 5;
    console.log(books);
37. 37.⚡ What number does this code print?
    let a = 58;
    let b = 10;
    console.log(a - b);
38. 38.⚡ Which JavaScript word runs code when true? (a) for (b) alert() (c) if (d) console.log()
39. 39.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Meera (d) Well done, Meera!
40. 40.⚡ What number does this code print?
    let a = 59;
    let b = 19;
    console.log(a - b);

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