JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 274 · 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 = "2";
   let y = 5;
   console.log(x + y); (a) 7 (b) 25 (c) Error
2. 2.⚡ What number does this code print?
   let a = 35;
   let b = 19;
   console.log(a - b);
3. 3.⚡ What number does this code print?
   let a = 9;
   let b = 6;
   console.log(a * b);
4. 4.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <style> (d) <script>
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 7;
   console.log(x + y); (a) Error (b) 9 (c) 27
6. 6.⚡ What number does this code print?
   let score = 22;
   score = score + 12;
   score = score - 28;
   console.log(score);
7. 7.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the title bar (d) on the printer
8. 8.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) alert() (c) if (d) let
9. 9.⚡ What number does this code print?
   let score = 13;
   score = score + 2;
   score = score - 3;
   console.log(score);
10. 10.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) for (d) alert()
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) Error (b) 15 (c) 87
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) 11 (b) 47 (c) Error
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) 19 (b) Error (c) 10
14. 14.⚡ What does alert() show? (a) a pop-up box (b) a picture (c) a new tab (d) a table
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) 11 (b) 56 (c) Error
16. 16.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .js (d) .html
17. 17.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) actions and changes (d) only colours
18. 18.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, Riya! (b) name (c) Welcome, name! (d) Riya
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) Error (b) 10 (c) 28
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) 29 (b) Error (c) 11
21. 21.⚡ What number does this code print?
    let a = 8;
    let b = 10;
    console.log(a * b);
22. 22.⚡ What number does this code print?
    let a = 27;
    let b = 3;
    console.log(a - b);
23. 23.⚡ Which word makes a new variable? (a) put (b) make (c) let (d) give
24. 24.⚡ What number does this code print?
    let a = 10;
    let b = 7;
    console.log(a * b);
25. 25.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, Arjun! (c) Arjun (d) Well done, name!
26. 26.⚡ What number does this code print?
    let runs = 24;
    runs = runs + 14;
    runs = runs - 17;
    console.log(runs);
27. 27.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Kabir (b) Hi, Kabir! (c) name (d) Hi, name!
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) 92 (b) Error (c) 11
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) Error (b) 58 (c) 13
30. 30.⚡ What number does this code print?
    let runs = 24;
    runs = runs + 12;
    runs = runs - 14;
    console.log(runs);
31. 31.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Zoya (b) name (c) Well done, Zoya! (d) Well done, name!
32. 32.⚡ What number does this code print?
    let apples = 23;
    apples = apples + 19;
    apples = apples - 41;
    console.log(apples);
33. 33.⚡ Which JavaScript word repeats code? (a) alert() (b) if (c) for (d) console.log()
34. 34.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Riya (b) Hello, name! (c) name (d) Hello, Riya!
35. 35.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) name (b) Arjun (c) Hi, name! (d) Hi, Arjun!
36. 36.⚡ What number does this code print?
    let score = 9;
    score = score + 13;
    score = score - 14;
    console.log(score);
37. 37.⚡ Which JavaScript word writes in the console? (a) alert() (b) let (c) for (d) console.log()
38. 38.⚡ What number does this code print?
    let score = 25;
    score = score + 12;
    score = score - 26;
    console.log(score);
39. 39.⚡ What number does this code print?
    let a = 8;
    let b = 12;
    console.log(a * b);
40. 40.⚡ What number does this code print?
    let marks = 10;
    marks = marks + 3;
    marks = marks - 4;
    console.log(marks);

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