JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 138 · 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 runs code when true? (a) for (b) console.log() (c) if (d) let
2. 2.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) console.log() (d) let
3. 3.⚡ What does this code show?
   let name = "Meera";
   alert("Hi, " + name + "!"); (a) name (b) Hi, Meera! (c) Hi, name! (d) Meera
4. 4.⚡ Which JavaScript word repeats code? (a) console.log() (b) alert() (c) for (d) if
5. 5.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <style> (d) <js>
6. 6.⚡ What number does this code print?
   let apples = 24;
   apples = apples + 4;
   apples = apples - 6;
   console.log(apples);
7. 7.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) in the console (d) on the printer
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 6;
   console.log(x + y); (a) Error (b) 16 (c) 7
9. 9.⚡ What does this code show?
   let name = "Riya";
   console.log("Hi, " + name + "!"); (a) Hi, Riya! (b) name (c) Riya (d) Hi, name!
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) 15 (b) Error (c) 87
11. 11.⚡ What number does this code print?
    let a = 22;
    let b = 1;
    console.log(a + b);
12. 12.⚡ What number does this code print?
    let a = 4;
    let b = 7;
    console.log(a * b);
13. 13.⚡ What number does this code print?
    let a = 8;
    let b = 8;
    console.log(a * b);
14. 14.⚡ 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
15. 15.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
16. 16.⚡ Which JavaScript word writes in the console? (a) for (b) alert() (c) console.log() (d) if
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) Error (b) 81 (c) 9
18. 18.⚡ What number does this code print?
    let a = 35;
    let b = 17;
    console.log(a + b);
19. 19.⚡ What number does this code print?
    let a = 26;
    let b = 36;
    console.log(a + b);
20. 20.⚡ 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
21. 21.⚡ What number does this code print?
    let score = 26;
    score = score + 2;
    score = score - 15;
    console.log(score);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) 36 (b) Error (c) 9
23. 23.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a picture (d) a table
24. 24.⚡ What number does this code print?
    let apples = 15;
    apples = apples + 15;
    apples = apples - 9;
    console.log(apples);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) Error (b) 72 (c) 9
26. 26.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Kabir (c) Welcome, Kabir! (d) name
27. 27.⚡ What number does this code print?
    let a = 27;
    let b = 27;
    console.log(a - b);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) 9 (b) Error (c) 18
29. 29.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Zoya (c) name (d) Hello, Zoya!
30. 30.⚡ What number does this code print?
    let a = 12;
    let b = 8;
    console.log(a * b);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) Error (b) 58 (c) 13
32. 32.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Aman (c) name (d) Hello, Aman!
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) Error (b) 63 (c) 9
34. 34.⚡ 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
35. 35.⚡ What number does this code print?
    let a = 2;
    let b = 2;
    console.log(a * b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) Error (b) 5 (c) 41
37. 37.⚡ What number does this code print?
    let score = 25;
    score = score + 10;
    score = score - 25;
    console.log(score);
38. 38.⚡ What number does this code print?
    let a = 36;
    let b = 6;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let score = 20;
    score = score + 6;
    score = score - 2;
    console.log(score);
40. 40.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Riya (b) Welcome, Riya! (c) name (d) Welcome, name!

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