JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 250 · 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 = "2";
   let y = 5;
   console.log(x + y); (a) 7 (b) Error (c) 25
2. 2.⚡ What number does this code print?
   let score = 24;
   score = score + 15;
   score = score - 3;
   console.log(score);
3. 3.⚡ What does this code show?
   let name = "Aman";
   console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Aman! (c) name (d) Aman
4. 4.⚡ Which JavaScript word makes a new variable? (a) for (b) console.log() (c) alert() (d) let
5. 5.⚡ What does alert() show? (a) a table (b) a new tab (c) a pop-up box (d) a picture
6. 6.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) the domain name (d) only colours
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 9;
   console.log(x + y); (a) Error (b) 69 (c) 15
8. 8.⚡ What does this code show?
   let name = "Zoya";
   console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Zoya (d) Well done, Zoya!
9. 9.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <style> (d) <script>
10. 10.⚡ Which JavaScript word repeats code? (a) let (b) for (c) alert() (d) if
11. 11.⚡ What number does this code print?
    let a = 22;
    let b = 26;
    console.log(a + b);
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) Error (b) 13 (c) 67
13. 13.⚡ What number does this code print?
    let a = 12;
    let b = 6;
    console.log(a + b);
14. 14.⚡ What number does this code print?
    let apples = 25;
    apples = apples + 9;
    apples = apples - 8;
    console.log(apples);
15. 15.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Riya! (c) Riya (d) name
16. 16.⚡ Where does console.log() show its output? (a) in the console (b) on the title bar (c) in the address bar (d) on the printer
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) 63 (b) 9 (c) Error
18. 18.⚡ 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
19. 19.⚡ What number does this code print?
    let a = 54;
    let b = 6;
    console.log(a - b);
20. 20.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) for (d) let
21. 21.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, Kabir! (b) Hello, name! (c) Kabir (d) name
22. 22.⚡ What number does this code print?
    let a = 38;
    let b = 10;
    console.log(a + b);
23. 23.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Kabir (d) Hi, Kabir!
24. 24.⚡ What number does this code print?
    let apples = 21;
    apples = apples + 3;
    apples = apples - 13;
    console.log(apples);
25. 25.⚡ What number does this code print?
    let a = 56;
    let b = 6;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let a = 24;
    let b = 10;
    console.log(a + b);
27. 27.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Zoya (b) name (c) Hello, name! (d) Hello, Zoya!
28. 28.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .js (d) .jpg
29. 29.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Riya (d) Hi, Riya!
30. 30.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Aman! (c) Aman (d) name
31. 31.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Arjun (b) Hi, Arjun! (c) name (d) Hi, name!
32. 32.⚡ What number does this code print?
    let a = 29;
    let b = 9;
    console.log(a - b);
33. 33.⚡ What number does this code print?
    let a = 11;
    let b = 5;
    console.log(a * b);
34. 34.⚡ What number does this code print?
    let a = 26;
    let b = 18;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let a = 37;
    let b = 24;
    console.log(a - b);
36. 36.⚡ What number does this code print?
    let a = 11;
    let b = 7;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let score = 16;
    score = score + 5;
    score = score - 9;
    console.log(score);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) 11 (b) 47 (c) Error
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) 58 (b) Error (c) 13
40. 40.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) let (d) alert()

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