JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 601 · 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.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .css (d) .jpg
2. 2.⚡ What does this code show?
   let name = "Aman";
   alert("Welcome, " + name + "!"); (a) name (b) Aman (c) Welcome, Aman! (d) Welcome, name!
3. 3.⚡ What number does this code print?
   let a = 41;
   let b = 4;
   console.log(a - b);
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 7;
   console.log(x + y); (a) 17 (b) Error (c) 8
5. 5.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) actions and changes (d) only colours
6. 6.⚡ What number does this code print?
   let a = 53;
   let b = 18;
   console.log(a + b);
7. 7.⚡ Which JavaScript word shows a pop-up box? (a) for (b) let (c) alert() (d) console.log()
8. 8.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the title bar (d) on the printer
9. 9.⚡ What number does this code print?
   let a = 8;
   let b = 11;
   console.log(a * b);
10. 10.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Riya (b) Hello, Riya! (c) Hello, name! (d) name
11. 11.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Zoya (d) Well done, Zoya!
12. 12.⚡ What number does this code print?
    let a = 30;
    let b = 13;
    console.log(a + b);
13. 13.⚡ What number does this code print?
    let marks = 11;
    marks = marks + 20;
    marks = marks - 29;
    console.log(marks);
14. 14.⚡ Which JavaScript word makes a new variable? (a) if (b) for (c) let (d) console.log()
15. 15.⚡ What number does this code print?
    let a = 36;
    let b = 21;
    console.log(a - b);
16. 16.⚡ What number does this code print?
    let score = 15;
    score = score + 16;
    score = score - 9;
    console.log(score);
17. 17.⚡ Which JavaScript word writes in the console? (a) console.log() (b) for (c) alert() (d) if
18. 18.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Aman! (c) Aman (d) Hi, name!
19. 19.⚡ Which JavaScript word runs code when true? (a) if (b) for (c) let (d) console.log()
20. 20.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Meera! (c) name (d) Meera
21. 21.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, Aman! (b) Aman (c) name (d) Well done, name!
22. 22.⚡ What number does this code print?
    let a = 5;
    let b = 5;
    console.log(a * b);
23. 23.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Kabir (b) Hello, name! (c) Hello, Kabir! (d) name
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y); (a) 11 (b) Error (c) 74
25. 25.⚡ What number does this code print?
    let score = 20;
    score = score + 2;
    score = score - 13;
    console.log(score);
26. 26.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Meera! (d) Meera
27. 27.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Zoya (c) name (d) Welcome, Zoya!
28. 28.⚡ Which word makes a new variable? (a) make (b) let (c) put (d) give
29. 29.⚡ What number does this code print?
    let a = 8;
    let b = 5;
    console.log(a * b);
30. 30.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Meera! (c) Meera (d) Welcome, name!
31. 31.⚡ What number does this code print?
    let a = 2;
    let b = 11;
    console.log(a * b);
32. 32.⚡ What number does this code print?
    let a = 55;
    let b = 19;
    console.log(a - b);
33. 33.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) Hello, name! (c) Hello, Riya! (d) name
34. 34.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <style> (d) <script>
35. 35.⚡ What number does this code print?
    let a = 39;
    let b = 2;
    console.log(a + b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) 3 (b) Error (c) 21
37. 37.⚡ What number does this code print?
    let a = 46;
    let b = 29;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let a = 12;
    let b = 3;
    console.log(a * b);
39. 39.⚡ What number does this code print?
    let a = 20;
    let b = 40;
    console.log(a + b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) Error (b) 4 (c) 13

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