JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 877 · 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 tag holds JavaScript in a page? (a) <script> (b) <style> (c) <code> (d) <js>
2. 2.⚡ Which word makes a new variable? (a) give (b) let (c) make (d) put
3. 3.⚡ What does this code show?
   let name = "Meera";
   console.log("Well done, " + name + "!"); (a) Meera (b) Well done, Meera! (c) name (d) Well done, name!
4. 4.⚡ What number does this code print?
   let a = 51;
   let b = 12;
   console.log(a + b);
5. 5.⚡ What number does this code print?
   let coins = 22;
   coins = coins + 8;
   coins = coins - 24;
   console.log(coins);
6. 6.⚡ What number does this code print?
   let marks = 10;
   marks = marks + 5;
   marks = marks - 1;
   console.log(marks);
7. 7.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) only colours (d) actions and changes
8. 8.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) for (c) alert() (d) let
9. 9.⚡ What number does this code print?
   let a = 45;
   let b = 35;
   console.log(a + b);
10. 10.⚡ What number does this code print?
    let a = 31;
    let b = 15;
    console.log(a + b);
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) 53 (b) Error (c) 8
12. 12.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Riya! (d) Riya
13. 13.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Riya (b) Hello, Riya! (c) name (d) Hello, name!
14. 14.⚡ Which JavaScript word writes in the console? (a) alert() (b) if (c) for (d) console.log()
15. 15.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) Hello, name! (c) name (d) Hello, Riya!
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) 10 (b) 73 (c) Error
17. 17.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Kabir (d) Hello, Kabir!
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) Error (b) 13 (c) 49
19. 19.⚡ What number does this code print?
    let a = 9;
    let b = 7;
    console.log(a * b);
20. 20.⚡ What number does this code print?
    let a = 59;
    let b = 28;
    console.log(a + b);
21. 21.⚡ Which JavaScript word shows a pop-up box? (a) for (b) console.log() (c) alert() (d) if
22. 22.⚡ What does alert() show? (a) a table (b) a new tab (c) a pop-up box (d) a picture
23. 23.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Meera (d) Hello, Meera!
24. 24.⚡ What number does this code print?
    let score = 15;
    score = score + 14;
    score = score - 3;
    console.log(score);
25. 25.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .css (d) .jpg
26. 26.⚡ What number does this code print?
    let a = 5;
    let b = 8;
    console.log(a + b);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) Error (b) 6 (c) 33
28. 28.⚡ What number does this code print?
    let runs = 7;
    runs = runs + 10;
    runs = runs - 9;
    console.log(runs);
29. 29.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the address bar (d) in the console
30. 30.⚡ Which JavaScript word runs code when true? (a) let (b) console.log() (c) for (d) if
31. 31.⚡ What number does this code print?
    let a = 19;
    let b = 17;
    console.log(a - b);
32. 32.⚡ What number does this code print?
    let a = 3;
    let b = 9;
    console.log(a * b);
33. 33.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Meera (b) name (c) Hi, Meera! (d) Hi, name!
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) 13 (b) Error (c) 94
35. 35.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Kabir! (c) name (d) Kabir
36. 36.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, Arjun! (b) name (c) Arjun (d) Hello, name!
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) Error (b) 7 (c) 34
38. 38.⚡ What number does this code print?
    let runs = 19;
    runs = runs + 6;
    runs = runs - 5;
    console.log(runs);
39. 39.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) name (b) Riya (c) Well done, name! (d) Well done, Riya!
40. 40.⚡ What number does this code print?
    let a = 46;
    let b = 9;
    console.log(a - b);

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