JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 954 · 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) .jpg (b) .css (c) .js (d) .html
2. 2.⚡ Which word makes a new variable? (a) give (b) let (c) put (d) make
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 3;
   console.log(x + y); (a) 23 (b) 5 (c) Error
4. 4.⚡ Which JavaScript word repeats code? (a) let (b) for (c) if (d) alert()
5. 5.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) for (c) let (d) if
6. 6.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <script> (d) <code>
7. 7.⚡ What number does this code print?
   let a = 31;
   let b = 20;
   console.log(a - b);
8. 8.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) actions and changes (d) only colours
9. 9.⚡ What number does this code print?
   let a = 4;
   let b = 6;
   console.log(a * b);
10. 10.⚡ What number does this code print?
    let a = 9;
    let b = 3;
    console.log(a * b);
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) Error (b) 44 (c) 8
12. 12.⚡ What number does this code print?
    let marks = 16;
    marks = marks + 8;
    marks = marks - 11;
    console.log(marks);
13. 13.⚡ Which JavaScript word runs code when true? (a) alert() (b) let (c) for (d) if
14. 14.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Meera! (c) Meera (d) Hi, name!
15. 15.⚡ What number does this code print?
    let a = 12;
    let b = 12;
    console.log(a * b);
16. 16.⚡ What number does this code print?
    let apples = 28;
    apples = apples + 15;
    apples = apples - 37;
    console.log(apples);
17. 17.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) if (d) for
18. 18.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) in the console (d) on the title bar
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) 6 (b) Error (c) 15
20. 20.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) name (b) Zoya (c) Well done, Zoya! (d) Well done, name!
21. 21.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) let (d) for
22. 22.⚡ What number does this code print?
    let a = 53;
    let b = 7;
    console.log(a + b);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) 14 (b) 77 (c) Error
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 81 (b) 9 (c) Error
25. 25.⚡ What number does this code print?
    let a = 45;
    let b = 1;
    console.log(a - b);
26. 26.⚡ What number does this code print?
    let score = 29;
    score = score + 15;
    score = score - 13;
    console.log(score);
27. 27.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Riya (b) Welcome, Riya! (c) Welcome, name! (d) name
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 32 (b) Error (c) 5
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) 25 (b) Error (c) 7
30. 30.⚡ What number does this code print?
    let a = 2;
    let b = 10;
    console.log(a * b);
31. 31.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Meera (d) Welcome, Meera!
32. 32.⚡ What number does this code print?
    let a = 30;
    let b = 36;
    console.log(a + b);
33. 33.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Riya (b) Hi, name! (c) name (d) Hi, Riya!
34. 34.⚡ What number does this code print?
    let a = 5;
    let b = 19;
    console.log(a + b);
35. 35.⚡ What does alert() show? (a) a table (b) a new tab (c) a pop-up box (d) a picture
36. 36.⚡ What number does this code print?
    let a = 52;
    let b = 9;
    console.log(a + b);
37. 37.⚡ What number does this code print?
    let apples = 25;
    apples = apples + 8;
    apples = apples - 19;
    console.log(apples);
38. 38.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Kabir (d) Hi, Kabir!
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) Error (b) 8 (c) 26
40. 40.⚡ What number does this code print?
    let marks = 12;
    marks = marks + 11;
    marks = marks - 9;
    console.log(marks);

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