JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 249 · 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 score = 9;
   score = score + 6;
   score = score - 8;
   console.log(score);
2. 2.⚡ What number does this code print?
   let books = 7;
   books = books + 19;
   books = books - 7;
   console.log(books);
3. 3.⚡ Which JavaScript word runs code when true? (a) let (b) console.log() (c) for (d) if
4. 4.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <style> (d) <script>
5. 5.⚡ Which JavaScript word writes in the console? (a) let (b) console.log() (c) alert() (d) if
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 1;
   console.log(x + y); (a) Error (b) 11 (c) 2
7. 7.⚡ What number does this code print?
   let a = 13;
   let b = 37;
   console.log(a + b);
8. 8.⚡ Which JavaScript word repeats code? (a) console.log() (b) alert() (c) let (d) for
9. 9.⚡ What number does this code print?
   let runs = 5;
   runs = runs + 12;
   runs = runs - 5;
   console.log(runs);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) 62 (b) Error (c) 8
11. 11.⚡ What number does this code print?
    let coins = 5;
    coins = coins + 4;
    coins = coins - 9;
    console.log(coins);
12. 12.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Kabir (d) Hello, Kabir!
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) 13 (b) 49 (c) Error
14. 14.⚡ What number does this code print?
    let a = 6;
    let b = 10;
    console.log(a * b);
15. 15.⚡ Which word makes a new variable? (a) let (b) give (c) make (d) put
16. 16.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 4;
    apples = apples - 4;
    console.log(apples);
17. 17.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Riya! (d) Riya
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 5 (b) Error (c) 32
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) 5 (b) 41 (c) Error
20. 20.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Kabir (d) Welcome, Kabir!
21. 21.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) for (d) alert()
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 7 (b) 43 (c) Error
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) 15 (b) 87 (c) Error
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) 22 (b) 4 (c) Error
25. 25.⚡ What does alert() show? (a) a pop-up box (b) a table (c) a picture (d) a new tab
26. 26.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Aman (c) Hello, Aman! (d) Hello, name!
27. 27.⚡ What number does this code print?
    let apples = 9;
    apples = apples + 10;
    apples = apples - 8;
    console.log(apples);
28. 28.⚡ What number does this code print?
    let a = 45;
    let b = 29;
    console.log(a - b);
29. 29.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) if (d) console.log()
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) 12 (b) 48 (c) Error
31. 31.⚡ What number does this code print?
    let a = 30;
    let b = 38;
    console.log(a + b);
32. 32.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the page title (d) the domain name
33. 33.⚡ What number does this code print?
    let apples = 19;
    apples = apples + 19;
    apples = apples - 6;
    console.log(apples);
34. 34.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Riya (b) Welcome, name! (c) Welcome, Riya! (d) name
35. 35.⚡ What number does this code print?
    let a = 37;
    let b = 21;
    console.log(a - b);
36. 36.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Zoya (b) name (c) Hello, name! (d) Hello, Zoya!
37. 37.⚡ What number does this code print?
    let a = 5;
    let b = 7;
    console.log(a * b);
38. 38.⚡ What number does this code print?
    let runs = 10;
    runs = runs + 4;
    runs = runs - 14;
    console.log(runs);
39. 39.⚡ 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
40. 40.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) name (b) Well done, Riya! (c) Well done, name! (d) Riya

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