JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 442 · 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 shows a pop-up box? (a) for (b) alert() (c) console.log() (d) let
2. 2.⚡ What number does this code print?
   let a = 5;
   let b = 10;
   console.log(a * b);
3. 3.⚡ What does this code show?
   let name = "Arjun";
   console.log("Hi, " + name + "!"); (a) Arjun (b) Hi, Arjun! (c) name (d) Hi, name!
4. 4.⚡ What number does this code print?
   let a = 23;
   let b = 3;
   console.log(a - b);
5. 5.⚡ What does this code show?
   let name = "Meera";
   console.log("Hello, " + name + "!"); (a) Hello, Meera! (b) name (c) Meera (d) Hello, name!
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 5;
   console.log(x + y); (a) Error (b) 6 (c) 15
7. 7.⚡ Which word makes a new variable? (a) give (b) let (c) make (d) put
8. 8.⚡ What number does this code print?
   let marks = 13;
   marks = marks + 15;
   marks = marks - 25;
   console.log(marks);
9. 9.⚡ Which JavaScript word writes in the console? (a) alert() (b) let (c) console.log() (d) if
10. 10.⚡ What number does this code print?
    let a = 8;
    let b = 10;
    console.log(a + b);
11. 11.⚡ 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
12. 12.⚡ What number does this code print?
    let runs = 12;
    runs = runs + 9;
    runs = runs - 19;
    console.log(runs);
13. 13.⚡ What number does this code print?
    let a = 18;
    let b = 20;
    console.log(a + b);
14. 14.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .css (d) .jpg
15. 15.⚡ What number does this code print?
    let a = 32;
    let b = 1;
    console.log(a + b);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) Error (b) 89 (c) 17
17. 17.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <js> (d) <script>
18. 18.⚡ What number does this code print?
    let a = 31;
    let b = 24;
    console.log(a + b);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 32 (b) 5 (c) Error
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) 13 (b) 76 (c) Error
21. 21.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Zoya (b) Hi, name! (c) Hi, Zoya! (d) name
22. 22.⚡ What number does this code print?
    let score = 9;
    score = score + 8;
    score = score - 9;
    console.log(score);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) 46 (b) Error (c) 10
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) 34 (b) 7 (c) Error
25. 25.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) actions and changes (d) only colours
26. 26.⚡ Which JavaScript word runs code when true? (a) if (b) alert() (c) let (d) for
27. 27.⚡ What does alert() show? (a) a picture (b) a new tab (c) a table (d) a pop-up box
28. 28.⚡ What number does this code print?
    let a = 47;
    let b = 21;
    console.log(a - b);
29. 29.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) alert() (d) for
30. 30.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 10;
    apples = apples - 3;
    console.log(apples);
31. 31.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Riya (b) Hi, name! (c) Hi, Riya! (d) name
32. 32.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Kabir! (c) Welcome, name! (d) Kabir
33. 33.⚡ What number does this code print?
    let a = 56;
    let b = 16;
    console.log(a + b);
34. 34.⚡ What number does this code print?
    let a = 48;
    let b = 8;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let a = 36;
    let b = 16;
    console.log(a - b);
36. 36.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) name (d) Hello, Aman!
37. 37.⚡ What number does this code print?
    let score = 22;
    score = score + 9;
    score = score - 19;
    console.log(score);
38. 38.⚡ What number does this code print?
    let score = 15;
    score = score + 11;
    score = score - 5;
    console.log(score);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) 12 (b) Error (c) 39
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 7;
    console.log(x + y); (a) 17 (b) 8 (c) Error

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