JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 101 · 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 print? (Look at the quotes!)
   let x = "8";
   let y = 2;
   console.log(x + y); (a) Error (b) 82 (c) 10
2. 2.⚡ What number does this code print?
   let a = 7;
   let b = 9;
   console.log(a * b);
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 7;
   console.log(x + y); (a) 17 (b) Error (c) 8
4. 4.⚡ Which word makes a new variable? (a) make (b) put (c) let (d) give
5. 5.⚡ What does alert() show? (a) a pop-up box (b) a table (c) a new tab (d) a picture
6. 6.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) let (c) alert() (d) if
7. 7.⚡ What number does this code print?
   let a = 5;
   let b = 6;
   console.log(a * b);
8. 8.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) console.log() (d) for
9. 9.⚡ What number does this code print?
   let a = 12;
   let b = 4;
   console.log(a * b);
10. 10.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Riya (d) Hi, Riya!
11. 11.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Welcome, name! (c) Riya (d) name
12. 12.⚡ What number does this code print?
    let a = 59;
    let b = 11;
    console.log(a + b);
13. 13.⚡ Which JavaScript word runs code when true? (a) let (b) alert() (c) console.log() (d) if
14. 14.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the console (d) in the address bar
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) 11 (b) 2 (c) Error
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) Error (b) 36 (c) 9
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 4;
    console.log(x + y); (a) Error (b) 12 (c) 84
18. 18.⚡ What number does this code print?
    let a = 21;
    let b = 12;
    console.log(a + b);
19. 19.⚡ What number does this code print?
    let apples = 19;
    apples = apples + 3;
    apples = apples - 19;
    console.log(apples);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 9 (b) 81 (c) Error
21. 21.⚡ What number does this code print?
    let a = 26;
    let b = 10;
    console.log(a - b);
22. 22.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Aman! (c) Aman (d) name
23. 23.⚡ What number does this code print?
    let a = 35;
    let b = 21;
    console.log(a + b);
24. 24.⚡ Which JavaScript word writes in the console? (a) alert() (b) if (c) console.log() (d) let
25. 25.⚡ What number does this code print?
    let a = 26;
    let b = 15;
    console.log(a - b);
26. 26.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Kabir (b) Welcome, name! (c) name (d) Welcome, Kabir!
27. 27.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Riya! (c) Hello, name! (d) Riya
28. 28.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <style> (d) <code>
29. 29.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, Riya! (b) name (c) Riya (d) Well done, name!
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) 85 (b) 13 (c) Error
31. 31.⚡ Which JavaScript word repeats code? (a) if (b) console.log() (c) alert() (d) for
32. 32.⚡ 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
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) Error (b) 7 (c) 43
34. 34.⚡ What number does this code print?
    let a = 28;
    let b = 24;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let a = 32;
    let b = 3;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let a = 10;
    let b = 3;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let a = 11;
    let b = 11;
    console.log(a * b);
38. 38.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, Meera! (b) Well done, name! (c) name (d) Meera
39. 39.⚡ What number does this code print?
    let score = 12;
    score = score + 20;
    score = score - 3;
    console.log(score);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y); (a) Error (b) 9 (c) 54

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