JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 562 · 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 writes in the console? (a) if (b) let (c) for (d) console.log()
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 5;
   console.log(x + y); (a) Error (b) 8 (c) 35
3. 3.⚡ Which word makes a new variable? (a) give (b) let (c) put (d) make
4. 4.⚡ What number does this code print?
   let score = 26;
   score = score + 14;
   score = score - 29;
   console.log(score);
5. 5.⚡ What does alert() show? (a) a picture (b) a table (c) a new tab (d) a pop-up box
6. 6.⚡ What does this code show?
   let name = "Meera";
   alert("Hi, " + name + "!"); (a) name (b) Meera (c) Hi, Meera! (d) Hi, name!
7. 7.⚡ What number does this code print?
   let score = 19;
   score = score + 5;
   score = score - 10;
   console.log(score);
8. 8.⚡ What does this code show?
   let name = "Meera";
   alert("Hello, " + name + "!"); (a) Hello, Meera! (b) Meera (c) name (d) Hello, name!
9. 9.⚡ What number does this code print?
   let coins = 5;
   coins = coins + 10;
   coins = coins - 2;
   console.log(coins);
10. 10.⚡ What number does this code print?
    let a = 30;
    let b = 10;
    console.log(a - b);
11. 11.⚡ What number does this code print?
    let score = 11;
    score = score + 18;
    score = score - 29;
    console.log(score);
12. 12.⚡ Which JavaScript word shows a pop-up box? (a) for (b) console.log() (c) let (d) alert()
13. 13.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the page title (d) the domain name
14. 14.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <script> (d) <code>
15. 15.⚡ What number does this code print?
    let a = 5;
    let b = 4;
    console.log(a * b);
16. 16.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Meera (d) Hi, Meera!
17. 17.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) in the console (d) on the title bar
18. 18.⚡ Which JavaScript word runs code when true? (a) alert() (b) let (c) if (d) console.log()
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 33 (b) Error (c) 6
20. 20.⚡ What number does this code print?
    let score = 14;
    score = score + 20;
    score = score - 12;
    console.log(score);
21. 21.⚡ What number does this code print?
    let marks = 10;
    marks = marks + 15;
    marks = marks - 1;
    console.log(marks);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) 21 (b) 3 (c) Error
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y); (a) Error (b) 9 (c) 54
24. 24.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Hi, Kabir! (b) Kabir (c) name (d) Hi, name!
25. 25.⚡ What number does this code print?
    let a = 6;
    let b = 33;
    console.log(a + b);
26. 26.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Riya (b) Welcome, Riya! (c) Welcome, name! (d) name
27. 27.⚡ What number does this code print?
    let a = 10;
    let b = 6;
    console.log(a * b);
28. 28.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Aman (c) name (d) Hello, Aman!
29. 29.⚡ What number does this code print?
    let a = 7;
    let b = 3;
    console.log(a * b);
30. 30.⚡ Which JavaScript word repeats code? (a) console.log() (b) let (c) for (d) if
31. 31.⚡ What number does this code print?
    let a = 30;
    let b = 21;
    console.log(a - b);
32. 32.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) console.log() (d) for
33. 33.⚡ What number does this code print?
    let score = 15;
    score = score + 12;
    score = score - 21;
    console.log(score);
34. 34.⚡ What number does this code print?
    let a = 54;
    let b = 11;
    console.log(a - b);
35. 35.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .html (d) .css
36. 36.⚡ 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
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) 10 (b) 19 (c) Error
38. 38.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Kabir! (c) Kabir (d) Welcome, name!
39. 39.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 4;
    apples = apples - 3;
    console.log(apples);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y); (a) Error (b) 11 (c) 74

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