JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 767 · 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 = "Zoya";
   console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Zoya! (d) Zoya
2. 2.⚡ 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
3. 3.⚡ What does this code show?
   let name = "Zoya";
   alert("Well done, " + name + "!"); (a) Zoya (b) name (c) Well done, name! (d) Well done, Zoya!
4. 4.⚡ Where does console.log() show its output? (a) in the console (b) on the title bar (c) on the printer (d) in the address bar
5. 5.⚡ What number does this code print?
   let runs = 14;
   runs = runs + 8;
   runs = runs - 6;
   console.log(runs);
6. 6.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) console.log() (d) for
7. 7.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) only colours (d) the page title
8. 8.⚡ Which JavaScript word makes a new variable? (a) for (b) if (c) console.log() (d) let
9. 9.⚡ What does this code show?
   let name = "Riya";
   console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Riya (d) Welcome, Riya!
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) 6 (b) 15 (c) Error
11. 11.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Riya (c) Hello, Riya! (d) name
12. 12.⚡ Which word makes a new variable? (a) give (b) let (c) put (d) make
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) Error (b) 11 (c) 47
14. 14.⚡ What number does this code print?
    let marks = 28;
    marks = marks + 8;
    marks = marks - 17;
    console.log(marks);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) 12 (b) Error (c) 66
16. 16.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .html (d) .css
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) 42 (b) 6 (c) Error
18. 18.⚡ What number does this code print?
    let a = 58;
    let b = 30;
    console.log(a + b);
19. 19.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Aman (b) name (c) Welcome, Aman! (d) Welcome, name!
20. 20.⚡ What number does this code print?
    let score = 23;
    score = score + 19;
    score = score - 22;
    console.log(score);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) 9 (b) Error (c) 36
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) Error (b) 14 (c) 95
23. 23.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Welcome, Aman! (b) Welcome, name! (c) Aman (d) name
24. 24.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, Meera! (b) Hello, name! (c) Meera (d) name
25. 25.⚡ What number does this code print?
    let apples = 26;
    apples = apples + 19;
    apples = apples - 3;
    console.log(apples);
26. 26.⚡ What number does this code print?
    let score = 10;
    score = score + 5;
    score = score - 1;
    console.log(score);
27. 27.⚡ What number does this code print?
    let books = 27;
    books = books + 7;
    books = books - 2;
    console.log(books);
28. 28.⚡ Which JavaScript word writes in the console? (a) let (b) if (c) for (d) console.log()
29. 29.⚡ Which JavaScript word shows a pop-up box? (a) if (b) for (c) alert() (d) console.log()
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 9;
    console.log(x + y); (a) 14 (b) Error (c) 59
31. 31.⚡ What number does this code print?
    let a = 57;
    let b = 29;
    console.log(a - b);
32. 32.⚡ What number does this code print?
    let marks = 17;
    marks = marks + 9;
    marks = marks - 6;
    console.log(marks);
33. 33.⚡ What does alert() show? (a) a new tab (b) a table (c) a pop-up box (d) a picture
34. 34.⚡ Which JavaScript word repeats code? (a) if (b) for (c) alert() (d) console.log()
35. 35.⚡ What number does this code print?
    let a = 14;
    let b = 6;
    console.log(a - b);
36. 36.⚡ What number does this code print?
    let a = 7;
    let b = 6;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let a = 2;
    let b = 5;
    console.log(a * b);
38. 38.⚡ What number does this code print?
    let marks = 17;
    marks = marks + 10;
    marks = marks - 15;
    console.log(marks);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) 12 (b) 48 (c) Error
40. 40.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Arjun (d) Well done, Arjun!

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