JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 325 · 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 runs code when true? (a) for (b) console.log() (c) if (d) alert()
2. 2.⚡ What number does this code print?
   let a = 5;
   let b = 6;
   console.log(a * b);
3. 3.⚡ What number does this code print?
   let runs = 14;
   runs = runs + 7;
   runs = runs - 17;
   console.log(runs);
4. 4.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) for (d) let
5. 5.⚡ What number does this code print?
   let a = 29;
   let b = 24;
   console.log(a + b);
6. 6.⚡ Which JavaScript word writes in the console? (a) alert() (b) for (c) console.log() (d) if
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 6;
   console.log(x + y); (a) 36 (b) Error (c) 9
8. 8.⚡ Which JavaScript word repeats code? (a) if (b) alert() (c) for (d) let
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 8;
   console.log(x + y); (a) 58 (b) 13 (c) Error
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) 10 (b) 28 (c) Error
11. 11.⚡ What does alert() show? (a) a picture (b) a new tab (c) a table (d) a pop-up box
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) 4 (b) Error (c) 31
13. 13.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) for (c) alert() (d) let
14. 14.⚡ What number does this code print?
    let a = 7;
    let b = 1;
    console.log(a + b);
15. 15.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Aman! (d) Aman
16. 16.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <script> (d) <js>
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y); (a) Error (b) 12 (c) 75
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) Error (b) 43 (c) 7
19. 19.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Riya! (c) Hi, name! (d) Riya
20. 20.⚡ What number does this code print?
    let a = 58;
    let b = 22;
    console.log(a - b);
21. 21.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Zoya (b) name (c) Well done, name! (d) Well done, Zoya!
22. 22.⚡ What number does this code print?
    let a = 50;
    let b = 10;
    console.log(a + b);
23. 23.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .css (d) .jpg
24. 24.⚡ What number does this code print?
    let coins = 29;
    coins = coins + 3;
    coins = coins - 31;
    console.log(coins);
25. 25.⚡ What number does this code print?
    let marks = 24;
    marks = marks + 17;
    marks = marks - 16;
    console.log(marks);
26. 26.⚡ What number does this code print?
    let a = 11;
    let b = 11;
    console.log(a * b);
27. 27.⚡ What number does this code print?
    let score = 30;
    score = score + 5;
    score = score - 24;
    console.log(score);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) 91 (b) Error (c) 10
29. 29.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) name (b) Kabir (c) Well done, name! (d) Well done, Kabir!
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) Error (b) 55 (c) 10
31. 31.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Riya (d) Hello, Riya!
32. 32.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) actions and changes (d) the domain name
33. 33.⚡ Which word makes a new variable? (a) put (b) give (c) let (d) make
34. 34.⚡ What number does this code print?
    let a = 6;
    let b = 7;
    console.log(a * b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) 23 (b) Error (c) 5
36. 36.⚡ What number does this code print?
    let a = 42;
    let b = 37;
    console.log(a + b);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y); (a) 45 (b) Error (c) 9
38. 38.⚡ What number does this code print?
    let a = 55;
    let b = 1;
    console.log(a - b);
39. 39.⚡ What number does this code print?
    let a = 43;
    let b = 9;
    console.log(a + b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) 17 (b) Error (c) 89

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