JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 629 · 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 show?
   let name = "Riya";
   alert("Hello, " + name + "!"); (a) Riya (b) Hello, Riya! (c) Hello, name! (d) name
2. 2.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) if (d) let
3. 3.⚡ What number does this code print?
   let a = 7;
   let b = 10;
   console.log(a * b);
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 8;
   console.log(x + y); (a) 9 (b) Error (c) 18
5. 5.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .css (d) .js
6. 6.⚡ Which JavaScript word makes a new variable? (a) if (b) alert() (c) for (d) let
7. 7.⚡ What number does this code print?
   let a = 41;
   let b = 37;
   console.log(a + b);
8. 8.⚡ Which JavaScript word runs code when true? (a) alert() (b) console.log() (c) if (d) let
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 2;
   console.log(x + y); (a) 8 (b) Error (c) 62
10. 10.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, Riya! (b) name (c) Riya (d) Well done, name!
11. 11.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Zoya (c) name (d) Welcome, Zoya!
12. 12.⚡ What number does this code print?
    let a = 4;
    let b = 11;
    console.log(a * b);
13. 13.⚡ What does alert() show? (a) a pop-up box (b) a picture (c) a table (d) a new tab
14. 14.⚡ 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
15. 15.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) name (b) Well done, Meera! (c) Well done, name! (d) Meera
16. 16.⚡ What number does this code print?
    let a = 25;
    let b = 8;
    console.log(a + b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) 8 (b) 44 (c) Error
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y); (a) Error (b) 93 (c) 12
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) 7 (b) 52 (c) Error
20. 20.⚡ What number does this code print?
    let apples = 15;
    apples = apples + 11;
    apples = apples - 22;
    console.log(apples);
21. 21.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Riya (b) Well done, Riya! (c) Well done, name! (d) name
22. 22.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Aman! (d) Aman
23. 23.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) for (d) alert()
24. 24.⚡ What number does this code print?
    let runs = 27;
    runs = runs + 6;
    runs = runs - 19;
    console.log(runs);
25. 25.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <script> (d) <js>
26. 26.⚡ What number does this code print?
    let a = 35;
    let b = 17;
    console.log(a + b);
27. 27.⚡ What number does this code print?
    let a = 31;
    let b = 30;
    console.log(a + b);
28. 28.⚡ What number does this code print?
    let a = 20;
    let b = 9;
    console.log(a - b);
29. 29.⚡ What number does this code print?
    let score = 29;
    score = score + 3;
    score = score - 27;
    console.log(score);
30. 30.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) actions and changes (d) the domain name
31. 31.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Aman (b) Welcome, Aman! (c) Welcome, name! (d) name
32. 32.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Zoya (b) Well done, Zoya! (c) name (d) Well done, name!
33. 33.⚡ What number does this code print?
    let apples = 25;
    apples = apples + 6;
    apples = apples - 20;
    console.log(apples);
34. 34.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 5;
    apples = apples - 20;
    console.log(apples);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y); (a) 9 (b) Error (c) 54
36. 36.⚡ What number does this code print?
    let a = 4;
    let b = 9;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let coins = 12;
    coins = coins + 5;
    coins = coins - 17;
    console.log(coins);
38. 38.⚡ What number does this code print?
    let a = 48;
    let b = 25;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let a = 14;
    let b = 2;
    console.log(a - b);
40. 40.⚡ What number does this code print?
    let marks = 12;
    marks = marks + 17;
    marks = marks - 27;
    console.log(marks);

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