JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 853 · 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 word makes a new variable? (a) let (b) give (c) put (d) make
2. 2.⚡ What does alert() show? (a) a pop-up box (b) a table (c) a picture (d) a new tab
3. 3.⚡ What does this code show?
   let name = "Meera";
   alert("Hi, " + name + "!"); (a) Hi, name! (b) Meera (c) Hi, Meera! (d) name
4. 4.⚡ What number does this code print?
   let apples = 14;
   apples = apples + 14;
   apples = apples - 17;
   console.log(apples);
5. 5.⚡ What does this code show?
   let name = "Arjun";
   alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Arjun! (d) Arjun
6. 6.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) console.log() (d) for
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 2;
   console.log(x + y); (a) 72 (b) 9 (c) Error
8. 8.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) if (d) alert()
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 8;
   console.log(x + y); (a) Error (b) 28 (c) 10
10. 10.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .jpg (d) .html
11. 11.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Meera (d) Well done, Meera!
12. 12.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, Meera! (c) Meera (d) Well done, name!
13. 13.⚡ What number does this code print?
    let marks = 6;
    marks = marks + 5;
    marks = marks - 3;
    console.log(marks);
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) 56 (b) Error (c) 11
15. 15.⚡ What number does this code print?
    let a = 26;
    let b = 10;
    console.log(a - b);
16. 16.⚡ What number does this code print?
    let a = 56;
    let b = 13;
    console.log(a + b);
17. 17.⚡ What number does this code print?
    let runs = 5;
    runs = runs + 6;
    runs = runs - 10;
    console.log(runs);
18. 18.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Aman (b) Welcome, Aman! (c) Welcome, name! (d) name
19. 19.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <script> (d) <code>
20. 20.⚡ Which JavaScript word makes a new variable? (a) let (b) console.log() (c) alert() (d) if
21. 21.⚡ 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
22. 22.⚡ What number does this code print?
    let a = 4;
    let b = 4;
    console.log(a * b);
23. 23.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 12;
    apples = apples - 3;
    console.log(apples);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 6;
    console.log(x + y); (a) Error (b) 7 (c) 16
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) 69 (b) Error (c) 15
26. 26.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) actions and changes (d) the page title
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) 15 (b) 96 (c) Error
28. 28.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) name (b) Kabir (c) Well done, Kabir! (d) Well done, name!
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) 3 (b) 21 (c) Error
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) 8 (b) 62 (c) Error
31. 31.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) Hello, name! (c) Hello, Riya! (d) name
32. 32.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, Aman! (b) name (c) Well done, name! (d) Aman
33. 33.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Zoya (d) Well done, Zoya!
34. 34.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) for (d) alert()
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) 18 (b) Error (c) 9
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) Error (b) 13 (c) 85
37. 37.⚡ What number does this code print?
    let a = 48;
    let b = 38;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let runs = 23;
    runs = runs + 10;
    runs = runs - 32;
    console.log(runs);
39. 39.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Aman (b) name (c) Hi, Aman! (d) Hi, name!
40. 40.⚡ What number does this code print?
    let marks = 7;
    marks = marks + 5;
    marks = marks - 2;
    console.log(marks);

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