JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 511 · 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 number does this code print?
   let marks = 9;
   marks = marks + 17;
   marks = marks - 19;
   console.log(marks);
2. 2.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) let (d) for
3. 3.⚡ What number does this code print?
   let coins = 7;
   coins = coins + 3;
   coins = coins - 6;
   console.log(coins);
4. 4.⚡ What number does this code print?
   let apples = 10;
   apples = apples + 3;
   apples = apples - 8;
   console.log(apples);
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 3;
   console.log(x + y); (a) Error (b) 63 (c) 9
6. 6.⚡ What does this code show?
   let name = "Arjun";
   alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Arjun! (c) name (d) Arjun
7. 7.⚡ What does this code show?
   let name = "Meera";
   alert("Welcome, " + name + "!"); (a) Welcome, Meera! (b) Meera (c) Welcome, name! (d) name
8. 8.⚡ What number does this code print?
   let a = 41;
   let b = 19;
   console.log(a + b);
9. 9.⚡ What does alert() show? (a) a pop-up box (b) a table (c) a new tab (d) a picture
10. 10.⚡ Which JavaScript word makes a new variable? (a) let (b) alert() (c) for (d) console.log()
11. 11.⚡ What number does this code print?
    let a = 7;
    let b = 9;
    console.log(a * b);
12. 12.⚡ Which JavaScript word writes in the console? (a) alert() (b) if (c) for (d) console.log()
13. 13.⚡ What number does this code print?
    let books = 18;
    books = books + 19;
    books = books - 1;
    console.log(books);
14. 14.⚡ What number does this code print?
    let runs = 15;
    runs = runs + 4;
    runs = runs - 6;
    console.log(runs);
15. 15.⚡ What number does this code print?
    let a = 49;
    let b = 10;
    console.log(a - b);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) 13 (b) Error (c) 58
17. 17.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Zoya (d) Welcome, Zoya!
18. 18.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 9;
    apples = apples - 16;
    console.log(apples);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y); (a) Error (b) 17 (c) 98
20. 20.⚡ What number does this code print?
    let books = 12;
    books = books + 4;
    books = books - 3;
    console.log(books);
21. 21.⚡ What number does this code print?
    let a = 30;
    let b = 28;
    console.log(a - b);
22. 22.⚡ What number does this code print?
    let a = 30;
    let b = 19;
    console.log(a - b);
23. 23.⚡ What number does this code print?
    let score = 10;
    score = score + 20;
    score = score - 4;
    console.log(score);
24. 24.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Arjun (c) name (d) Hello, Arjun!
25. 25.⚡ What number does this code print?
    let apples = 26;
    apples = apples + 9;
    apples = apples - 33;
    console.log(apples);
26. 26.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Riya (d) Well done, Riya!
27. 27.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Aman (b) Hi, Aman! (c) name (d) Hi, name!
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) 49 (b) 13 (c) Error
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) Error (b) 48 (c) 12
30. 30.⚡ What number does this code print?
    let score = 27;
    score = score + 4;
    score = score - 7;
    console.log(score);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) 41 (b) 5 (c) Error
32. 32.⚡ What number does this code print?
    let a = 40;
    let b = 15;
    console.log(a - b);
33. 33.⚡ What number does this code print?
    let a = 44;
    let b = 6;
    console.log(a - b);
34. 34.⚡ What number does this code print?
    let a = 19;
    let b = 24;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let books = 19;
    books = books + 17;
    books = books - 24;
    console.log(books);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) 4 (b) 31 (c) Error
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) Error (b) 92 (c) 11
38. 38.⚡ Which word makes a new variable? (a) let (b) make (c) give (d) put
39. 39.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) Hello, Aman! (c) name (d) Hello, name!
40. 40.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) on the title bar (d) in the console

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