JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 628 · 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 a = 5;
   let b = 5;
   console.log(a * b);
2. 2.⚡ Which JavaScript word repeats code? (a) for (b) if (c) alert() (d) console.log()
3. 3.⚡ What does this code show?
   let name = "Riya";
   console.log("Hello, " + name + "!"); (a) Riya (b) name (c) Hello, name! (d) Hello, Riya!
4. 4.⚡ What number does this code print?
   let score = 6;
   score = score + 7;
   score = score - 13;
   console.log(score);
5. 5.⚡ Which JavaScript word writes in the console? (a) console.log() (b) alert() (c) if (d) for
6. 6.⚡ What does this code show?
   let name = "Arjun";
   console.log("Hi, " + name + "!"); (a) name (b) Hi, Arjun! (c) Arjun (d) Hi, name!
7. 7.⚡ What number does this code print?
   let a = 2;
   let b = 7;
   console.log(a * b);
8. 8.⚡ What number does this code print?
   let a = 40;
   let b = 24;
   console.log(a + b);
9. 9.⚡ Which word makes a new variable? (a) give (b) let (c) put (d) make
10. 10.⚡ Which JavaScript word shows a pop-up box? (a) let (b) if (c) for (d) alert()
11. 11.⚡ What number does this code print?
    let a = 5;
    let b = 12;
    console.log(a * b);
12. 12.⚡ What number does this code print?
    let a = 48;
    let b = 32;
    console.log(a + b);
13. 13.⚡ What number does this code print?
    let a = 53;
    let b = 19;
    console.log(a - b);
14. 14.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the page title (c) the domain name (d) only colours
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) 91 (b) 10 (c) Error
16. 16.⚡ What number does this code print?
    let a = 44;
    let b = 34;
    console.log(a + b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) 58 (b) 13 (c) Error
18. 18.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) if (c) let (d) alert()
19. 19.⚡ Which JavaScript word runs code when true? (a) for (b) let (c) if (d) console.log()
20. 20.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, Meera! (b) name (c) Welcome, name! (d) Meera
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) Error (b) 89 (c) 17
22. 22.⚡ What number does this code print?
    let marks = 9;
    marks = marks + 10;
    marks = marks - 19;
    console.log(marks);
23. 23.⚡ What number does this code print?
    let coins = 21;
    coins = coins + 13;
    coins = coins - 29;
    console.log(coins);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) Error (b) 42 (c) 6
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 6 (b) 33 (c) Error
26. 26.⚡ What number does this code print?
    let marks = 7;
    marks = marks + 15;
    marks = marks - 9;
    console.log(marks);
27. 27.⚡ What number does this code print?
    let a = 21;
    let b = 6;
    console.log(a + b);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 9 (b) 72 (c) Error
29. 29.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Zoya (c) name (d) Hello, Zoya!
30. 30.⚡ What number does this code print?
    let a = 19;
    let b = 5;
    console.log(a - b);
31. 31.⚡ What number does this code print?
    let score = 9;
    score = score + 13;
    score = score - 5;
    console.log(score);
32. 32.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Riya (c) name (d) Welcome, Riya!
33. 33.⚡ What number does this code print?
    let runs = 24;
    runs = runs + 8;
    runs = runs - 15;
    console.log(runs);
34. 34.⚡ What number does this code print?
    let a = 50;
    let b = 8;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let a = 9;
    let b = 16;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let books = 25;
    books = books + 12;
    books = books - 36;
    console.log(books);
37. 37.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Aman (b) Well done, name! (c) Well done, Aman! (d) name
38. 38.⚡ 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
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) Error (b) 31 (c) 4
40. 40.⚡ What number does this code print?
    let a = 3;
    let b = 3;
    console.log(a * b);

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