JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 534 · 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) in the console (c) on the title bar (d) in the address bar
2. 2.⚡ What number does this code print?
   let a = 22;
   let b = 20;
   console.log(a + b);
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 3;
   console.log(x + y); (a) 8 (b) Error (c) 53
4. 4.⚡ What does this code show?
   let name = "Kabir";
   alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Kabir! (d) Kabir
5. 5.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <js> (d) <style>
6. 6.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the domain name (d) the page title
7. 7.⚡ Which word makes a new variable? (a) let (b) put (c) give (d) make
8. 8.⚡ What number does this code print?
   let marks = 23;
   marks = marks + 14;
   marks = marks - 5;
   console.log(marks);
9. 9.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) alert() (c) if (d) let
10. 10.⚡ What number does this code print?
    let a = 23;
    let b = 23;
    console.log(a - b);
11. 11.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) for (d) alert()
12. 12.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
13. 13.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, Aman! (b) Hi, name! (c) Aman (d) name
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y); (a) 16 (b) Error (c) 88
15. 15.⚡ What number does this code print?
    let a = 2;
    let b = 3;
    console.log(a * b);
16. 16.⚡ What number does this code print?
    let coins = 29;
    coins = coins + 2;
    coins = coins - 24;
    console.log(coins);
17. 17.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) name (c) Kabir (d) Welcome, name!
18. 18.⚡ Which JavaScript word repeats code? (a) console.log() (b) if (c) let (d) for
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) 95 (b) Error (c) 14
20. 20.⚡ What number does this code print?
    let runs = 17;
    runs = runs + 10;
    runs = runs - 20;
    console.log(runs);
21. 21.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 9;
    apples = apples - 17;
    console.log(apples);
22. 22.⚡ What number does this code print?
    let a = 51;
    let b = 26;
    console.log(a + b);
23. 23.⚡ What number does this code print?
    let a = 10;
    let b = 6;
    console.log(a * b);
24. 24.⚡ Which JavaScript word writes in the console? (a) alert() (b) for (c) console.log() (d) if
25. 25.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Arjun (d) Well done, Arjun!
26. 26.⚡ What number does this code print?
    let a = 37;
    let b = 1;
    console.log(a + b);
27. 27.⚡ What number does this code print?
    let a = 25;
    let b = 19;
    console.log(a - b);
28. 28.⚡ What number does this code print?
    let a = 14;
    let b = 1;
    console.log(a - b);
29. 29.⚡ What number does this code print?
    let a = 35;
    let b = 22;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let a = 4;
    let b = 8;
    console.log(a * b);
31. 31.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) name (b) Riya (c) Hi, name! (d) Hi, Riya!
32. 32.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Meera (c) Welcome, Meera! (d) name
33. 33.⚡ What number does this code print?
    let score = 7;
    score = score + 9;
    score = score - 8;
    console.log(score);
34. 34.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Arjun (c) Welcome, Arjun! (d) name
35. 35.⚡ What number does this code print?
    let a = 12;
    let b = 7;
    console.log(a - b);
36. 36.⚡ What number does this code print?
    let a = 37;
    let b = 8;
    console.log(a + b);
37. 37.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Meera (b) Hi, Meera! (c) name (d) Hi, name!
38. 38.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Arjun! (c) Arjun (d) name
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) 10 (b) 37 (c) Error
40. 40.⚡ What number does this code print?
    let a = 11;
    let b = 16;
    console.log(a + b);

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