JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 378 · 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 = "4";
   let y = 3;
   console.log(x + y); (a) 7 (b) Error (c) 43
2. 2.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hello, " + name + "!"); (a) Hello, Kabir! (b) Kabir (c) name (d) Hello, name!
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 4;
   console.log(x + y); (a) 10 (b) 64 (c) Error
4. 4.⚡ What number does this code print?
   let a = 36;
   let b = 28;
   console.log(a - b);
5. 5.⚡ What number does this code print?
   let a = 13;
   let b = 40;
   console.log(a + b);
6. 6.⚡ What does this code show?
   let name = "Aman";
   alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Aman (c) Welcome, Aman! (d) name
7. 7.⚡ What number does this code print?
   let apples = 5;
   apples = apples + 5;
   apples = apples - 2;
   console.log(apples);
8. 8.⚡ What number does this code print?
   let coins = 6;
   coins = coins + 11;
   coins = coins - 16;
   console.log(coins);
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 4;
   console.log(x + y); (a) Error (b) 13 (c) 94
10. 10.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the page title (d) the domain name
11. 11.⚡ Which JavaScript word shows a pop-up box? (a) if (b) for (c) alert() (d) console.log()
12. 12.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <js> (d) <code>
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) 11 (b) Error (c) 83
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) 95 (b) 14 (c) Error
15. 15.⚡ What number does this code print?
    let a = 7;
    let b = 10;
    console.log(a * b);
16. 16.⚡ Which JavaScript word writes in the console? (a) for (b) alert() (c) let (d) console.log()
17. 17.⚡ What number does this code print?
    let marks = 25;
    marks = marks + 11;
    marks = marks - 33;
    console.log(marks);
18. 18.⚡ What number does this code print?
    let marks = 26;
    marks = marks + 3;
    marks = marks - 17;
    console.log(marks);
19. 19.⚡ Which JavaScript word runs code when true? (a) alert() (b) console.log() (c) if (d) let
20. 20.⚡ What number does this code print?
    let score = 23;
    score = score + 17;
    score = score - 13;
    console.log(score);
21. 21.⚡ What number does this code print?
    let a = 34;
    let b = 7;
    console.log(a - b);
22. 22.⚡ What number does this code print?
    let a = 33;
    let b = 33;
    console.log(a - b);
23. 23.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Zoya! (c) Zoya (d) name
24. 24.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Arjun! (c) name (d) Arjun
25. 25.⚡ Which JavaScript word makes a new variable? (a) if (b) for (c) let (d) console.log()
26. 26.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Meera (b) Well done, name! (c) name (d) Well done, Meera!
27. 27.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Hello, Arjun! (b) name (c) Hello, name! (d) Arjun
28. 28.⚡ What does alert() show? (a) a picture (b) a new tab (c) a table (d) a pop-up box
29. 29.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .jpg (d) .css
30. 30.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Meera! (c) name (d) Meera
31. 31.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Zoya (c) name (d) Well done, Zoya!
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) Error (b) 10 (c) 37
33. 33.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Arjun (b) Welcome, Arjun! (c) name (d) Welcome, name!
34. 34.⚡ What number does this code print?
    let score = 24;
    score = score + 10;
    score = score - 14;
    console.log(score);
35. 35.⚡ Which word makes a new variable? (a) let (b) put (c) give (d) make
36. 36.⚡ What number does this code print?
    let a = 60;
    let b = 32;
    console.log(a - b);
37. 37.⚡ What number does this code print?
    let a = 44;
    let b = 12;
    console.log(a + b);
38. 38.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, Aman! (b) Aman (c) Hi, name! (d) name
39. 39.⚡ Which JavaScript word repeats code? (a) let (b) if (c) alert() (d) for
40. 40.⚡ 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

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