JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 632 · 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 repeats code? (a) alert() (b) console.log() (c) let (d) for
2. 2.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the domain name (c) only colours (d) the page title
3. 3.⚡ What does this code show?
   let name = "Riya";
   alert("Hello, " + name + "!"); (a) name (b) Hello, Riya! (c) Riya (d) Hello, name!
4. 4.⚡ Which word makes a new variable? (a) give (b) put (c) make (d) let
5. 5.⚡ What number does this code print?
   let coins = 17;
   coins = coins + 16;
   coins = coins - 25;
   console.log(coins);
6. 6.⚡ What does this code show?
   let name = "Aman";
   console.log("Welcome, " + name + "!"); (a) Aman (b) Welcome, name! (c) name (d) Welcome, Aman!
7. 7.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) if (d) let
8. 8.⚡ What does this code show?
   let name = "Arjun";
   console.log("Welcome, " + name + "!"); (a) Arjun (b) name (c) Welcome, name! (d) Welcome, Arjun!
9. 9.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <style> (d) <code>
10. 10.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, Meera! (b) Hello, name! (c) name (d) Meera
11. 11.⚡ What number does this code print?
    let apples = 21;
    apples = apples + 14;
    apples = apples - 26;
    console.log(apples);
12. 12.⚡ What does alert() show? (a) a picture (b) a table (c) a pop-up box (d) a new tab
13. 13.⚡ Which JavaScript word shows a pop-up box? (a) for (b) alert() (c) let (d) console.log()
14. 14.⚡ What number does this code print?
    let score = 30;
    score = score + 8;
    score = score - 36;
    console.log(score);
15. 15.⚡ What number does this code print?
    let a = 10;
    let b = 8;
    console.log(a - b);
16. 16.⚡ What number does this code print?
    let coins = 15;
    coins = coins + 4;
    coins = coins - 14;
    console.log(coins);
17. 17.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) name (b) Arjun (c) Hi, Arjun! (d) Hi, name!
18. 18.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Arjun! (c) Hello, name! (d) Arjun
19. 19.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .css (d) .js
20. 20.⚡ What number does this code print?
    let runs = 5;
    runs = runs + 12;
    runs = runs - 2;
    console.log(runs);
21. 21.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) on the printer (d) in the address bar
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) 15 (b) Error (c) 87
23. 23.⚡ What number does this code print?
    let marks = 24;
    marks = marks + 20;
    marks = marks - 14;
    console.log(marks);
24. 24.⚡ What number does this code print?
    let runs = 18;
    runs = runs + 9;
    runs = runs - 8;
    console.log(runs);
25. 25.⚡ What number does this code print?
    let a = 9;
    let b = 6;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let runs = 21;
    runs = runs + 10;
    runs = runs - 15;
    console.log(runs);
27. 27.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Kabir! (d) Kabir
28. 28.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Aman! (c) name (d) Aman
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) 10 (b) 73 (c) Error
30. 30.⚡ What number does this code print?
    let a = 30;
    let b = 26;
    console.log(a + b);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) Error (b) 86 (c) 14
32. 32.⚡ What number does this code print?
    let a = 14;
    let b = 11;
    console.log(a - b);
33. 33.⚡ What number does this code print?
    let marks = 13;
    marks = marks + 9;
    marks = marks - 11;
    console.log(marks);
34. 34.⚡ What number does this code print?
    let a = 2;
    let b = 6;
    console.log(a * b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) 10 (b) 91 (c) Error
36. 36.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Meera (c) name (d) Welcome, Meera!
37. 37.⚡ What number does this code print?
    let score = 16;
    score = score + 5;
    score = score - 20;
    console.log(score);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) 6 (b) Error (c) 42
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) 7 (b) 52 (c) Error
40. 40.⚡ What number does this code print?
    let a = 8;
    let b = 5;
    console.log(a + b);

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