JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 284 · 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 does this code show?
   let name = "Zoya";
   alert("Welcome, " + name + "!"); (a) name (b) Welcome, Zoya! (c) Zoya (d) Welcome, name!
2. 2.⚡ What does alert() show? (a) a picture (b) a new tab (c) a pop-up box (d) a table
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 9;
   console.log(x + y); (a) 49 (b) 13 (c) Error
4. 4.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <js> (d) <script>
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 7;
   console.log(x + y); (a) 9 (b) 27 (c) Error
6. 6.⚡ What number does this code print?
   let apples = 30;
   apples = apples + 17;
   apples = apples - 13;
   console.log(apples);
7. 7.⚡ What does this code show?
   let name = "Kabir";
   alert("Hello, " + name + "!"); (a) Hello, Kabir! (b) name (c) Hello, name! (d) Kabir
8. 8.⚡ What does this code show?
   let name = "Kabir";
   console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Kabir (d) Welcome, Kabir!
9. 9.⚡ Which word makes a new variable? (a) let (b) put (c) give (d) make
10. 10.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Zoya! (c) Zoya (d) name
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) Error (b) 9 (c) 72
12. 12.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) Hello, Aman! (d) name
13. 13.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Hello, Arjun! (b) Hello, name! (c) Arjun (d) name
14. 14.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) name (c) Hello, name! (d) Hello, Aman!
15. 15.⚡ What number does this code print?
    let a = 15;
    let b = 15;
    console.log(a + b);
16. 16.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, Aman! (b) Well done, name! (c) Aman (d) name
17. 17.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) name (b) Arjun (c) Hello, Arjun! (d) Hello, name!
18. 18.⚡ Which JavaScript word shows a pop-up box? (a) for (b) let (c) alert() (d) console.log()
19. 19.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the console (d) in the address bar
20. 20.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Kabir (b) name (c) Welcome, Kabir! (d) Welcome, name!
21. 21.⚡ Which JavaScript word runs code when true? (a) console.log() (b) for (c) let (d) if
22. 22.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) actions and changes (d) the page title
23. 23.⚡ What number does this code print?
    let a = 5;
    let b = 10;
    console.log(a * b);
24. 24.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Arjun (b) name (c) Hi, Arjun! (d) Hi, name!
25. 25.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, Kabir! (b) name (c) Hello, name! (d) Kabir
26. 26.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) let (d) alert()
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) 68 (b) Error (c) 14
28. 28.⚡ What number does this code print?
    let a = 17;
    let b = 3;
    console.log(a - b);
29. 29.⚡ What number does this code print?
    let a = 50;
    let b = 17;
    console.log(a - b);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) 13 (b) 76 (c) Error
31. 31.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .jpg (d) .js
32. 32.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) Zoya (c) name (d) Welcome, name!
33. 33.⚡ What number does this code print?
    let score = 18;
    score = score + 9;
    score = score - 23;
    console.log(score);
34. 34.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Aman! (c) Hi, name! (d) Aman
35. 35.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Zoya (b) name (c) Well done, Zoya! (d) Well done, name!
36. 36.⚡ What number does this code print?
    let score = 10;
    score = score + 14;
    score = score - 6;
    console.log(score);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) Error (b) 11 (c) 38
38. 38.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Riya! (d) Riya
39. 39.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Riya! (c) Welcome, name! (d) Riya
40. 40.⚡ Which JavaScript word writes in the console? (a) if (b) let (c) for (d) console.log()

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