JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 792 · 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) alert() (b) if (c) for (d) console.log()
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 1;
   console.log(x + y); (a) Error (b) 10 (c) 91
3. 3.⚡ What number does this code print?
   let a = 30;
   let b = 4;
   console.log(a + b);
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 1;
   console.log(x + y); (a) 21 (b) Error (c) 3
5. 5.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) alert() (d) let
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 3;
   console.log(x + y); (a) 5 (b) 23 (c) Error
7. 7.⚡ What number does this code print?
   let score = 30;
   score = score + 4;
   score = score - 16;
   console.log(score);
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 4;
   console.log(x + y); (a) 64 (b) Error (c) 10
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 2;
   console.log(x + y); (a) Error (b) 32 (c) 5
10. 10.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the address bar (d) in the console
11. 11.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <js> (d) <script>
12. 12.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Riya (b) name (c) Well done, name! (d) Well done, Riya!
13. 13.⚡ Which JavaScript word writes in the console? (a) alert() (b) let (c) console.log() (d) for
14. 14.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Zoya (b) Hello, Zoya! (c) name (d) Hello, name!
15. 15.⚡ What number does this code print?
    let coins = 30;
    coins = coins + 4;
    coins = coins - 26;
    console.log(coins);
16. 16.⚡ What number does this code print?
    let a = 2;
    let b = 4;
    console.log(a * b);
17. 17.⚡ What number does this code print?
    let a = 11;
    let b = 4;
    console.log(a * b);
18. 18.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Zoya! (c) name (d) Zoya
19. 19.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Aman! (c) Aman (d) name
20. 20.⚡ What number does this code print?
    let a = 50;
    let b = 32;
    console.log(a + b);
21. 21.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 7;
    runs = runs - 5;
    console.log(runs);
22. 22.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) the domain name (d) actions and changes
23. 23.⚡ Which JavaScript word makes a new variable? (a) let (b) for (c) if (d) console.log()
24. 24.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Zoya (b) Hi, name! (c) name (d) Hi, Zoya!
25. 25.⚡ What number does this code print?
    let a = 24;
    let b = 31;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let a = 51;
    let b = 17;
    console.log(a + b);
27. 27.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, Kabir! (b) Hello, name! (c) Kabir (d) name
28. 28.⚡ What number does this code print?
    let coins = 11;
    coins = coins + 7;
    coins = coins - 9;
    console.log(coins);
29. 29.⚡ What number does this code print?
    let a = 28;
    let b = 21;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let a = 8;
    let b = 8;
    console.log(a * b);
31. 31.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Meera (b) Hello, Meera! (c) name (d) Hello, name!
32. 32.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .js (d) .jpg
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) 9 (b) Error (c) 63
34. 34.⚡ Which word makes a new variable? (a) let (b) give (c) make (d) put
35. 35.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) let (d) for
36. 36.⚡ What does alert() show? (a) a picture (b) a new tab (c) a pop-up box (d) a table
37. 37.⚡ What number does this code print?
    let score = 13;
    score = score + 6;
    score = score - 16;
    console.log(score);
38. 38.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, Arjun! (b) Arjun (c) Hi, name! (d) name
39. 39.⚡ What number does this code print?
    let a = 29;
    let b = 28;
    console.log(a - b);
40. 40.⚡ What number does this code print?
    let score = 21;
    score = score + 19;
    score = score - 28;
    console.log(score);

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