JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 689 · 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 = "1";
   let y = 7;
   console.log(x + y); (a) Error (b) 8 (c) 17
2. 2.⚡ Which JavaScript word writes in the console? (a) let (b) if (c) for (d) console.log()
3. 3.⚡ Which JavaScript word shows a pop-up box? (a) if (b) let (c) console.log() (d) alert()
4. 4.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hello, " + name + "!"); (a) name (b) Hello, Kabir! (c) Hello, name! (d) Kabir
5. 5.⚡ What does this code show?
   let name = "Aman";
   alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Aman! (c) Aman (d) name
6. 6.⚡ What number does this code print?
   let coins = 8;
   coins = coins + 12;
   coins = coins - 18;
   console.log(coins);
7. 7.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the domain name (d) the page title
8. 8.⚡ Which JavaScript word runs code when true? (a) for (b) alert() (c) if (d) console.log()
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 6;
   console.log(x + y); (a) Error (b) 86 (c) 14
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) 7 (b) Error (c) 34
11. 11.⚡ What number does this code print?
    let coins = 30;
    coins = coins + 15;
    coins = coins - 31;
    console.log(coins);
12. 12.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .js (d) .jpg
13. 13.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) in the address bar (d) on the printer
14. 14.⚡ Which word makes a new variable? (a) make (b) put (c) give (d) let
15. 15.⚡ What number does this code print?
    let a = 8;
    let b = 2;
    console.log(a * b);
16. 16.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <js> (d) <code>
17. 17.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Zoya! (d) Zoya
18. 18.⚡ What number does this code print?
    let a = 2;
    let b = 11;
    console.log(a * b);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) 4 (b) 31 (c) Error
20. 20.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Riya (c) Well done, Riya! (d) name
21. 21.⚡ Which JavaScript word makes a new variable? (a) if (b) alert() (c) console.log() (d) let
22. 22.⚡ Which JavaScript word repeats code? (a) if (b) for (c) console.log() (d) let
23. 23.⚡ What number does this code print?
    let a = 22;
    let b = 4;
    console.log(a - b);
24. 24.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Zoya (c) name (d) Well done, Zoya!
25. 25.⚡ What number does this code print?
    let score = 8;
    score = score + 11;
    score = score - 3;
    console.log(score);
26. 26.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Arjun! (c) name (d) Arjun
27. 27.⚡ What number does this code print?
    let marks = 29;
    marks = marks + 18;
    marks = marks - 6;
    console.log(marks);
28. 28.⚡ What number does this code print?
    let a = 5;
    let b = 12;
    console.log(a * b);
29. 29.⚡ What number does this code print?
    let a = 35;
    let b = 33;
    console.log(a - b);
30. 30.⚡ What number does this code print?
    let a = 3;
    let b = 7;
    console.log(a * b);
31. 31.⚡ What number does this code print?
    let a = 8;
    let b = 5;
    console.log(a * b);
32. 32.⚡ What number does this code print?
    let a = 5;
    let b = 2;
    console.log(a * b);
33. 33.⚡ What number does this code print?
    let a = 8;
    let b = 6;
    console.log(a - b);
34. 34.⚡ 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
35. 35.⚡ What number does this code print?
    let score = 7;
    score = score + 13;
    score = score - 1;
    console.log(score);
36. 36.⚡ What number does this code print?
    let marks = 10;
    marks = marks + 13;
    marks = marks - 6;
    console.log(marks);
37. 37.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, Zoya! (b) Zoya (c) name (d) Hi, name!
38. 38.⚡ What number does this code print?
    let marks = 11;
    marks = marks + 2;
    marks = marks - 2;
    console.log(marks);
39. 39.⚡ What number does this code print?
    let a = 59;
    let b = 23;
    console.log(a + b);
40. 40.⚡ What number does this code print?
    let a = 49;
    let b = 5;
    console.log(a - b);

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