JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 852 · 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 books = 13;
   books = books + 7;
   books = books - 10;
   console.log(books);
2. 2.⚡ What does this code show?
   let name = "Zoya";
   console.log("Well done, " + name + "!"); (a) Well done, name! (b) Zoya (c) Well done, Zoya! (d) name
3. 3.⚡ Which word makes a new variable? (a) let (b) make (c) put (d) give
4. 4.⚡ Which JavaScript word writes in the console? (a) if (b) console.log() (c) let (d) for
5. 5.⚡ Which JavaScript word repeats code? (a) if (b) console.log() (c) for (d) let
6. 6.⚡ What number does this code print?
   let a = 7;
   let b = 14;
   console.log(a + b);
7. 7.⚡ Which JavaScript word runs code when true? (a) let (b) console.log() (c) alert() (d) if
8. 8.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <style> (d) <code>
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 8;
   console.log(x + y); (a) 13 (b) 58 (c) Error
10. 10.⚡ What number does this code print?
    let a = 6;
    let b = 6;
    console.log(a * b);
11. 11.⚡ What number does this code print?
    let score = 20;
    score = score + 14;
    score = score - 22;
    console.log(score);
12. 12.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the title bar (d) on the printer
13. 13.⚡ What number does this code print?
    let a = 58;
    let b = 34;
    console.log(a - b);
14. 14.⚡ What number does this code print?
    let coins = 10;
    coins = coins + 18;
    coins = coins - 20;
    console.log(coins);
15. 15.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Arjun (d) Well done, Arjun!
16. 16.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Aman (c) name (d) Hi, Aman!
17. 17.⚡ What number does this code print?
    let a = 44;
    let b = 1;
    console.log(a + b);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 9;
    console.log(x + y); (a) Error (b) 79 (c) 16
19. 19.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Aman! (d) Aman
20. 20.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Arjun (b) name (c) Welcome, name! (d) Welcome, Arjun!
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) Error (b) 29 (c) 11
22. 22.⚡ What number does this code print?
    let a = 18;
    let b = 7;
    console.log(a + b);
23. 23.⚡ What number does this code print?
    let coins = 5;
    coins = coins + 3;
    coins = coins - 8;
    console.log(coins);
24. 24.⚡ What number does this code print?
    let marks = 29;
    marks = marks + 9;
    marks = marks - 15;
    console.log(marks);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) Error (b) 9 (c) 36
26. 26.⚡ What number does this code print?
    let a = 8;
    let b = 10;
    console.log(a * b);
27. 27.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Riya! (c) name (d) Riya
28. 28.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a picture (d) a table
29. 29.⚡ What number does this code print?
    let a = 54;
    let b = 25;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let a = 58;
    let b = 4;
    console.log(a + b);
31. 31.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) for (d) console.log()
32. 32.⚡ What number does this code print?
    let a = 4;
    let b = 5;
    console.log(a * b);
33. 33.⚡ Which JavaScript word makes a new variable? (a) alert() (b) for (c) if (d) let
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 33 (b) Error (c) 6
35. 35.⚡ What number does this code print?
    let a = 3;
    let b = 6;
    console.log(a * b);
36. 36.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 18;
    apples = apples - 3;
    console.log(apples);
37. 37.⚡ What number does this code print?
    let runs = 5;
    runs = runs + 3;
    runs = runs - 2;
    console.log(runs);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y); (a) Error (b) 16 (c) 88
39. 39.⚡ What number does this code print?
    let a = 5;
    let b = 6;
    console.log(a * b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) Error (b) 7 (c) 25

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