JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 789 · 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 makes a new variable? (a) alert() (b) for (c) let (d) if
2. 2.⚡ What number does this code print?
   let coins = 11;
   coins = coins + 9;
   coins = coins - 8;
   console.log(coins);
3. 3.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <script> (d) <style>
4. 4.⚡ What number does this code print?
   let a = 56;
   let b = 21;
   console.log(a + b);
5. 5.⚡ 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
6. 6.⚡ What number does this code print?
   let a = 21;
   let b = 20;
   console.log(a + b);
7. 7.⚡ What number does this code print?
   let a = 48;
   let b = 34;
   console.log(a - b);
8. 8.⚡ Which JavaScript word runs code when true? (a) alert() (b) console.log() (c) if (d) for
9. 9.⚡ Which JavaScript word repeats code? (a) console.log() (b) let (c) for (d) alert()
10. 10.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Aman! (d) Aman
11. 11.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a picture (d) a table
12. 12.⚡ What number does this code print?
    let a = 8;
    let b = 1;
    console.log(a + b);
13. 13.⚡ What number does this code print?
    let a = 57;
    let b = 9;
    console.log(a + b);
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y); (a) 98 (b) 17 (c) Error
15. 15.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) if (d) let
16. 16.⚡ What number does this code print?
    let a = 7;
    let b = 11;
    console.log(a * b);
17. 17.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Kabir (d) Hello, Kabir!
18. 18.⚡ What number does this code print?
    let a = 2;
    let b = 12;
    console.log(a * b);
19. 19.⚡ What number does this code print?
    let coins = 16;
    coins = coins + 6;
    coins = coins - 21;
    console.log(coins);
20. 20.⚡ What number does this code print?
    let coins = 13;
    coins = coins + 2;
    coins = coins - 5;
    console.log(coins);
21. 21.⚡ Which JavaScript word writes in the console? (a) if (b) for (c) alert() (d) console.log()
22. 22.⚡ Which word makes a new variable? (a) make (b) let (c) give (d) put
23. 23.⚡ What number does this code print?
    let apples = 9;
    apples = apples + 12;
    apples = apples - 18;
    console.log(apples);
24. 24.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Zoya (b) name (c) Well done, name! (d) Well done, Zoya!
25. 25.⚡ What number does this code print?
    let score = 5;
    score = score + 2;
    score = score - 7;
    console.log(score);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) Error (b) 96 (c) 15
27. 27.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .js (d) .css
28. 28.⚡ What number does this code print?
    let a = 17;
    let b = 35;
    console.log(a + b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) Error (b) 17 (c) 89
30. 30.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) name (b) Arjun (c) Hi, Arjun! (d) Hi, name!
31. 31.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) only colours (d) the page title
32. 32.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Riya (b) name (c) Hi, name! (d) Hi, Riya!
33. 33.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Meera (d) Welcome, Meera!
34. 34.⚡ What number does this code print?
    let coins = 18;
    coins = coins + 14;
    coins = coins - 18;
    console.log(coins);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 5 (b) 32 (c) Error
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) 25 (b) 7 (c) Error
37. 37.⚡ What number does this code print?
    let coins = 30;
    coins = coins + 13;
    coins = coins - 11;
    console.log(coins);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) Error (b) 33 (c) 6
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) Error (b) 12 (c) 66
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y); (a) 45 (b) 9 (c) Error

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