JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 778 · 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.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) let (d) alert()
2. 2.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Kabir! (d) Kabir
3. 3.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) alert() (d) if
4. 4.⚡ What number does this code print?
   let runs = 6;
   runs = runs + 15;
   runs = runs - 8;
   console.log(runs);
5. 5.⚡ What does this code show?
   let name = "Zoya";
   alert("Well done, " + name + "!"); (a) name (b) Zoya (c) Well done, Zoya! (d) Well done, name!
6. 6.⚡ Which JavaScript word shows a pop-up box? (a) let (b) for (c) if (d) alert()
7. 7.⚡ What number does this code print?
   let score = 22;
   score = score + 18;
   score = score - 2;
   console.log(score);
8. 8.⚡ Which word makes a new variable? (a) let (b) give (c) make (d) put
9. 9.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <style> (d) <code>
10. 10.⚡ What number does this code print?
    let a = 9;
    let b = 33;
    console.log(a + b);
11. 11.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Riya (d) Welcome, Riya!
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) 5 (b) Error (c) 23
13. 13.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Meera! (c) Meera (d) name
14. 14.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Arjun (c) name (d) Hi, Arjun!
15. 15.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the domain name (c) only colours (d) the page title
16. 16.⚡ What number does this code print?
    let coins = 20;
    coins = coins + 19;
    coins = coins - 18;
    console.log(coins);
17. 17.⚡ Which JavaScript word writes in the console? (a) console.log() (b) alert() (c) let (d) for
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 4 (b) Error (c) 13
19. 19.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, Riya! (b) name (c) Riya (d) Well done, name!
20. 20.⚡ What number does this code print?
    let coins = 25;
    coins = coins + 11;
    coins = coins - 25;
    console.log(coins);
21. 21.⚡ What number does this code print?
    let a = 20;
    let b = 4;
    console.log(a + b);
22. 22.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 6;
    apples = apples - 8;
    console.log(apples);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 7;
    console.log(x + y); (a) Error (b) 17 (c) 8
24. 24.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a new tab (d) a table
25. 25.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Aman (c) name (d) Hi, Aman!
26. 26.⚡ What number does this code print?
    let books = 29;
    books = books + 15;
    books = books - 7;
    console.log(books);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) 95 (b) 14 (c) Error
28. 28.⚡ What number does this code print?
    let apples = 14;
    apples = apples + 5;
    apples = apples - 5;
    console.log(apples);
29. 29.⚡ What number does this code print?
    let a = 36;
    let b = 34;
    console.log(a - b);
30. 30.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) name (b) Aman (c) Hello, Aman! (d) Hello, name!
31. 31.⚡ What number does this code print?
    let a = 34;
    let b = 37;
    console.log(a + b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) Error (b) 5 (c) 14
33. 33.⚡ What number does this code print?
    let runs = 30;
    runs = runs + 15;
    runs = runs - 44;
    console.log(runs);
34. 34.⚡ What number does this code print?
    let coins = 28;
    coins = coins + 4;
    coins = coins - 4;
    console.log(coins);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) 63 (b) 9 (c) Error
36. 36.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) if (d) alert()
37. 37.⚡ What number does this code print?
    let a = 10;
    let b = 3;
    console.log(a * b);
38. 38.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) in the console (d) on the printer
39. 39.⚡ What number does this code print?
    let a = 2;
    let b = 5;
    console.log(a * b);
40. 40.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Riya (b) Hello, name! (c) name (d) Hello, Riya!

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