JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 161 · 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 JavaScript add to a web page? (a) the page title (b) actions and changes (c) only colours (d) the domain name
2. 2.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) on the printer (d) in the console
3. 3.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hello, " + name + "!"); (a) Hello, Zoya! (b) Hello, name! (c) name (d) Zoya
4. 4.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) let (d) for
5. 5.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) if (d) let
6. 6.⚡ 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
7. 7.⚡ What does this code show?
   let name = "Aman";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Aman! (c) name (d) Aman
8. 8.⚡ What number does this code print?
   let a = 56;
   let b = 8;
   console.log(a - b);
9. 9.⚡ Which word makes a new variable? (a) give (b) put (c) make (d) let
10. 10.⚡ What does alert() show? (a) a pop-up box (b) a table (c) a picture (d) a new tab
11. 11.⚡ Which JavaScript word shows a pop-up box? (a) for (b) alert() (c) let (d) if
12. 12.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 11;
    apples = apples - 9;
    console.log(apples);
13. 13.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) name (b) Zoya (c) Well done, Zoya! (d) Well done, name!
14. 14.⚡ Which JavaScript word repeats code? (a) alert() (b) console.log() (c) if (d) for
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) 6 (b) Error (c) 51
16. 16.⚡ What number does this code print?
    let books = 23;
    books = books + 17;
    books = books - 20;
    console.log(books);
17. 17.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 19;
    apples = apples - 22;
    console.log(apples);
18. 18.⚡ What number does this code print?
    let a = 6;
    let b = 7;
    console.log(a * b);
19. 19.⚡ What number does this code print?
    let apples = 14;
    apples = apples + 14;
    apples = apples - 16;
    console.log(apples);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) 11 (b) Error (c) 56
21. 21.⚡ What number does this code print?
    let score = 13;
    score = score + 3;
    score = score - 4;
    console.log(score);
22. 22.⚡ Which JavaScript word makes a new variable? (a) alert() (b) if (c) for (d) let
23. 23.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Arjun! (d) Arjun
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 4;
    console.log(x + y); (a) 12 (b) 84 (c) Error
25. 25.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Aman (b) Well done, name! (c) Well done, Aman! (d) name
26. 26.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .css (d) .jpg
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y); (a) 11 (b) 74 (c) Error
28. 28.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Kabir (b) Well done, Kabir! (c) Well done, name! (d) name
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) 7 (b) Error (c) 25
30. 30.⚡ What number does this code print?
    let apples = 13;
    apples = apples + 18;
    apples = apples - 26;
    console.log(apples);
31. 31.⚡ What number does this code print?
    let a = 3;
    let b = 5;
    console.log(a * b);
32. 32.⚡ What number does this code print?
    let a = 10;
    let b = 2;
    console.log(a * b);
33. 33.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Riya (d) Well done, Riya!
34. 34.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) name (b) Kabir (c) Hello, name! (d) Hello, Kabir!
35. 35.⚡ What number does this code print?
    let a = 4;
    let b = 12;
    console.log(a * b);
36. 36.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Arjun (b) name (c) Hello, Arjun! (d) Hello, name!
37. 37.⚡ What number does this code print?
    let marks = 17;
    marks = marks + 4;
    marks = marks - 8;
    console.log(marks);
38. 38.⚡ What number does this code print?
    let a = 57;
    let b = 1;
    console.log(a - b);
39. 39.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Arjun! (c) Arjun (d) Hello, name!
40. 40.⚡ What number does this code print?
    let runs = 18;
    runs = runs + 2;
    runs = runs - 2;
    console.log(runs);

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