JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 995 · 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 makes a new variable? (a) alert() (b) if (c) let (d) for
2. 2.⚡ What does this code show?
   let name = "Kabir";
   alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Kabir! (d) Kabir
3. 3.⚡ Which word makes a new variable? (a) make (b) let (c) put (d) give
4. 4.⚡ What number does this code print?
   let runs = 10;
   runs = runs + 12;
   runs = runs - 8;
   console.log(runs);
5. 5.⚡ What number does this code print?
   let score = 13;
   score = score + 14;
   score = score - 10;
   console.log(score);
6. 6.⚡ What does this code show?
   let name = "Meera";
   console.log("Hi, " + name + "!"); (a) Meera (b) name (c) Hi, name! (d) Hi, Meera!
7. 7.⚡ What number does this code print?
   let a = 28;
   let b = 20;
   console.log(a + b);
8. 8.⚡ What number does this code print?
   let apples = 27;
   apples = apples + 10;
   apples = apples - 17;
   console.log(apples);
9. 9.⚡ What does this code show?
   let name = "Aman";
   console.log("Hi, " + name + "!"); (a) Aman (b) name (c) Hi, Aman! (d) Hi, name!
10. 10.⚡ What number does this code print?
    let runs = 7;
    runs = runs + 16;
    runs = runs - 8;
    console.log(runs);
11. 11.⚡ What number does this code print?
    let a = 50;
    let b = 32;
    console.log(a - b);
12. 12.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Arjun (b) Hi, Arjun! (c) Hi, name! (d) name
13. 13.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) in the console (d) on the printer
14. 14.⚡ Which JavaScript word runs code when true? (a) console.log() (b) alert() (c) if (d) let
15. 15.⚡ Which JavaScript word repeats code? (a) console.log() (b) alert() (c) for (d) let
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) 13 (b) Error (c) 49
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) Error (b) 33 (c) 6
18. 18.⚡ 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!
19. 19.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) actions and changes (d) the page title
20. 20.⚡ Which JavaScript word shows a pop-up box? (a) if (b) let (c) alert() (d) console.log()
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) 85 (b) 13 (c) Error
22. 22.⚡ What number does this code print?
    let a = 12;
    let b = 8;
    console.log(a * b);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 8 (b) Error (c) 35
24. 24.⚡ What number does this code print?
    let a = 5;
    let b = 8;
    console.log(a + b);
25. 25.⚡ What number does this code print?
    let marks = 8;
    marks = marks + 6;
    marks = marks - 1;
    console.log(marks);
26. 26.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) for (d) let
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) 46 (b) Error (c) 10
28. 28.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a new tab (d) a table
29. 29.⚡ What number does this code print?
    let apples = 25;
    apples = apples + 15;
    apples = apples - 31;
    console.log(apples);
30. 30.⚡ What number does this code print?
    let a = 10;
    let b = 9;
    console.log(a * b);
31. 31.⚡ What number does this code print?
    let runs = 12;
    runs = runs + 3;
    runs = runs - 6;
    console.log(runs);
32. 32.⚡ What number does this code print?
    let a = 55;
    let b = 2;
    console.log(a - b);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) 61 (b) 7 (c) Error
34. 34.⚡ What number does this code print?
    let a = 13;
    let b = 4;
    console.log(a + b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) Error (b) 11 (c) 56
36. 36.⚡ What number does this code print?
    let a = 50;
    let b = 20;
    console.log(a - b);
37. 37.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 13;
    apples = apples - 26;
    console.log(apples);
38. 38.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <code> (d) <js>
39. 39.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 15;
    apples = apples - 23;
    console.log(apples);
40. 40.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Riya (b) Welcome, Riya! (c) name (d) Welcome, name!

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