JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 300 · 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 shows a pop-up box? (a) if (b) console.log() (c) for (d) alert()
2. 2.⚡ What number does this code print?
   let marks = 28;
   marks = marks + 15;
   marks = marks - 27;
   console.log(marks);
3. 3.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hi, " + name + "!"); (a) Kabir (b) Hi, name! (c) name (d) Hi, Kabir!
4. 4.⚡ What does this code show?
   let name = "Kabir";
   alert("Hi, " + name + "!"); (a) Kabir (b) name (c) Hi, Kabir! (d) Hi, name!
5. 5.⚡ What does this code show?
   let name = "Zoya";
   alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Zoya (d) Well done, Zoya!
6. 6.⚡ What number does this code print?
   let a = 5;
   let b = 7;
   console.log(a * b);
7. 7.⚡ What number does this code print?
   let a = 6;
   let b = 2;
   console.log(a * b);
8. 8.⚡ Which JavaScript word makes a new variable? (a) let (b) alert() (c) for (d) console.log()
9. 9.⚡ What number does this code print?
   let a = 11;
   let b = 4;
   console.log(a * b);
10. 10.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) let (d) if
11. 11.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Riya! (c) Hi, name! (d) Riya
12. 12.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, Aman! (b) Aman (c) name (d) Hello, name!
13. 13.⚡ Which JavaScript word runs code when true? (a) for (b) alert() (c) console.log() (d) if
14. 14.⚡ What number does this code print?
    let coins = 30;
    coins = coins + 20;
    coins = coins - 36;
    console.log(coins);
15. 15.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Welcome, Aman! (b) Welcome, name! (c) name (d) Aman
16. 16.⚡ What number does this code print?
    let a = 7;
    let b = 3;
    console.log(a + b);
17. 17.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
18. 18.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Kabir (c) name (d) Welcome, Kabir!
19. 19.⚡ What number does this code print?
    let a = 51;
    let b = 10;
    console.log(a - b);
20. 20.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .js (d) .css
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) 13 (b) 85 (c) Error
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) 26 (b) Error (c) 8
23. 23.⚡ What number does this code print?
    let a = 14;
    let b = 6;
    console.log(a - b);
24. 24.⚡ What number does this code print?
    let a = 27;
    let b = 1;
    console.log(a - b);
25. 25.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <style> (d) <code>
26. 26.⚡ 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
27. 27.⚡ What number does this code print?
    let a = 8;
    let b = 31;
    console.log(a + b);
28. 28.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Arjun (d) Well done, Arjun!
29. 29.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Riya (b) Hi, name! (c) name (d) Hi, Riya!
30. 30.⚡ What number does this code print?
    let a = 31;
    let b = 12;
    console.log(a - b);
31. 31.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, Meera! (b) name (c) Meera (d) Welcome, name!
32. 32.⚡ 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
33. 33.⚡ What number does this code print?
    let a = 39;
    let b = 27;
    console.log(a + b);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) Error (b) 13 (c) 67
35. 35.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, Meera! (b) Meera (c) Well done, name! (d) name
36. 36.⚡ What number does this code print?
    let apples = 18;
    apples = apples + 3;
    apples = apples - 18;
    console.log(apples);
37. 37.⚡ What number does this code print?
    let a = 16;
    let b = 12;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let a = 5;
    let b = 2;
    console.log(a * b);
39. 39.⚡ What number does this code print?
    let a = 6;
    let b = 2;
    console.log(a + b);
40. 40.⚡ What number does this code print?
    let a = 5;
    let b = 32;
    console.log(a + b);

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