JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 192 · 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.⚡ 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
2. 2.⚡ What does this code show?
   let name = "Kabir";
   console.log("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) Kabir (c) Welcome, name! (d) name
3. 3.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) for (d) alert()
4. 4.⚡ What number does this code print?
   let a = 7;
   let b = 14;
   console.log(a + b);
5. 5.⚡ What does this code show?
   let name = "Meera";
   alert("Welcome, " + name + "!"); (a) Meera (b) Welcome, name! (c) Welcome, Meera! (d) name
6. 6.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) actions and changes (d) only colours
7. 7.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .css (d) .html
8. 8.⚡ What does this code show?
   let name = "Aman";
   alert("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Aman (d) Well done, Aman!
9. 9.⚡ What number does this code print?
   let a = 2;
   let b = 2;
   console.log(a * b);
10. 10.⚡ 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
11. 11.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
12. 12.⚡ What number does this code print?
    let a = 33;
    let b = 10;
    console.log(a + b);
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) 13 (b) Error (c) 94
14. 14.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Riya! (d) Riya
15. 15.⚡ What number does this code print?
    let a = 18;
    let b = 28;
    console.log(a + b);
16. 16.⚡ What number does this code print?
    let apples = 9;
    apples = apples + 15;
    apples = apples - 8;
    console.log(apples);
17. 17.⚡ What number does this code print?
    let coins = 19;
    coins = coins + 16;
    coins = coins - 31;
    console.log(coins);
18. 18.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <js> (d) <style>
19. 19.⚡ Which JavaScript word runs code when true? (a) if (b) for (c) alert() (d) let
20. 20.⚡ What number does this code print?
    let runs = 19;
    runs = runs + 8;
    runs = runs - 27;
    console.log(runs);
21. 21.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, Kabir! (b) Hello, name! (c) Kabir (d) name
22. 22.⚡ What number does this code print?
    let a = 55;
    let b = 3;
    console.log(a + b);
23. 23.⚡ What number does this code print?
    let a = 12;
    let b = 10;
    console.log(a - b);
24. 24.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) for (d) if
25. 25.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, Aman! (b) Hi, name! (c) name (d) Aman
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) Error (b) 18 (c) 99
27. 27.⚡ What number does this code print?
    let a = 2;
    let b = 9;
    console.log(a * b);
28. 28.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Kabir (c) Welcome, Kabir! (d) name
29. 29.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) let (d) alert()
30. 30.⚡ What does alert() show? (a) a picture (b) a table (c) a pop-up box (d) a new tab
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) Error (b) 5 (c) 32
32. 32.⚡ What number does this code print?
    let a = 5;
    let b = 11;
    console.log(a * b);
33. 33.⚡ What number does this code print?
    let a = 4;
    let b = 7;
    console.log(a * b);
34. 34.⚡ 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
35. 35.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Meera (b) Hi, Meera! (c) name (d) Hi, name!
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) 34 (b) Error (c) 7
37. 37.⚡ What number does this code print?
    let a = 16;
    let b = 4;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let a = 45;
    let b = 6;
    console.log(a - b);
39. 39.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Aman (b) name (c) Welcome, Aman! (d) Welcome, name!
40. 40.⚡ What number does this code print?
    let a = 54;
    let b = 4;
    console.log(a - b);

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