JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 883 · 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) alert() (b) for (c) let (d) console.log()
2. 2.⚡ Which JavaScript word runs code when true? (a) let (b) for (c) if (d) console.log()
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 7;
   console.log(x + y); (a) 8 (b) 17 (c) Error
4. 4.⚡ What does this code show?
   let name = "Kabir";
   alert("Hello, " + name + "!"); (a) name (b) Kabir (c) Hello, name! (d) Hello, Kabir!
5. 5.⚡ What number does this code print?
   let marks = 12;
   marks = marks + 8;
   marks = marks - 20;
   console.log(marks);
6. 6.⚡ What number does this code print?
   let runs = 5;
   runs = runs + 11;
   runs = runs - 10;
   console.log(runs);
7. 7.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Kabir! (d) Kabir
8. 8.⚡ What number does this code print?
   let a = 15;
   let b = 13;
   console.log(a + b);
9. 9.⚡ Which JavaScript word repeats code? (a) for (b) let (c) if (d) console.log()
10. 10.⚡ Which word makes a new variable? (a) make (b) let (c) put (d) give
11. 11.⚡ Which JavaScript word writes in the console? (a) if (b) let (c) console.log() (d) alert()
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 6 (b) 33 (c) Error
13. 13.⚡ What number does this code print?
    let a = 11;
    let b = 1;
    console.log(a + b);
14. 14.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) name (b) Arjun (c) Hello, name! (d) Hello, Arjun!
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 9 (b) Error (c) 81
16. 16.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <js> (d) <code>
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) 7 (b) Error (c) 25
18. 18.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) for (c) alert() (d) let
19. 19.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, Arjun! (b) Hello, name! (c) name (d) Arjun
20. 20.⚡ What number does this code print?
    let a = 59;
    let b = 19;
    console.log(a - b);
21. 21.⚡ What number does this code print?
    let a = 57;
    let b = 23;
    console.log(a + b);
22. 22.⚡ What number does this code print?
    let a = 36;
    let b = 6;
    console.log(a - b);
23. 23.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Kabir (b) Welcome, name! (c) name (d) Welcome, Kabir!
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) 99 (b) 18 (c) Error
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y); (a) 74 (b) Error (c) 11
26. 26.⚡ What number does this code print?
    let coins = 7;
    coins = coins + 9;
    coins = coins - 1;
    console.log(coins);
27. 27.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .jpg (d) .css
28. 28.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) name (c) Zoya (d) Welcome, name!
29. 29.⚡ What number does this code print?
    let runs = 26;
    runs = runs + 11;
    runs = runs - 8;
    console.log(runs);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 4 (b) 13 (c) Error
31. 31.⚡ What number does this code print?
    let runs = 17;
    runs = runs + 3;
    runs = runs - 7;
    console.log(runs);
32. 32.⚡ What number does this code print?
    let coins = 15;
    coins = coins + 15;
    coins = coins - 9;
    console.log(coins);
33. 33.⚡ What number does this code print?
    let a = 46;
    let b = 6;
    console.log(a + b);
34. 34.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the printer (d) on the title bar
35. 35.⚡ What number does this code print?
    let coins = 22;
    coins = coins + 8;
    coins = coins - 25;
    console.log(coins);
36. 36.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Zoya! (c) Hello, name! (d) Zoya
37. 37.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 4;
    marks = marks - 3;
    console.log(marks);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) Error (b) 5 (c) 23
39. 39.⚡ What number does this code print?
    let a = 22;
    let b = 4;
    console.log(a + b);
40. 40.⚡ What does alert() show? (a) a new tab (b) a table (c) a pop-up box (d) a picture

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