JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 966 · 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.⚡ What number does this code print?
   let a = 51;
   let b = 17;
   console.log(a - b);
2. 2.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) console.log() (d) alert()
3. 3.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a picture (d) a new tab
4. 4.⚡ What number does this code print?
   let a = 38;
   let b = 1;
   console.log(a + b);
5. 5.⚡ Which JavaScript word repeats code? (a) for (b) if (c) alert() (d) console.log()
6. 6.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <js> (d) <style>
7. 7.⚡ Which JavaScript word runs code when true? (a) if (b) alert() (c) console.log() (d) let
8. 8.⚡ What number does this code print?
   let a = 32;
   let b = 20;
   console.log(a + b);
9. 9.⚡ What does this code show?
   let name = "Riya";
   console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Riya! (c) Welcome, name! (d) Riya
10. 10.⚡ What number does this code print?
    let a = 12;
    let b = 11;
    console.log(a * b);
11. 11.⚡ What number does this code print?
    let a = 4;
    let b = 11;
    console.log(a * b);
12. 12.⚡ Which JavaScript word writes in the console? (a) console.log() (b) for (c) let (d) if
13. 13.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y); (a) Error (b) 45 (c) 9
15. 15.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) let (c) alert() (d) for
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) 7 (b) 25 (c) Error
17. 17.⚡ What number does this code print?
    let a = 60;
    let b = 37;
    console.log(a - b);
18. 18.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Meera! (c) Meera (d) name
19. 19.⚡ What number does this code print?
    let coins = 7;
    coins = coins + 13;
    coins = coins - 4;
    console.log(coins);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) Error (b) 10 (c) 73
21. 21.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Riya (c) Hi, Riya! (d) name
22. 22.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, Zoya! (b) name (c) Zoya (d) Hi, name!
23. 23.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Kabir (b) Hello, name! (c) name (d) Hello, Kabir!
24. 24.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) in the address bar (d) on the title bar
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) Error (b) 2 (c) 11
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y); (a) 17 (b) 98 (c) Error
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) Error (b) 3 (c) 21
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) Error (b) 8 (c) 62
29. 29.⚡ What number does this code print?
    let a = 10;
    let b = 40;
    console.log(a + b);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 6;
    console.log(x + y); (a) 16 (b) 7 (c) Error
31. 31.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, Aman! (b) Hello, name! (c) Aman (d) name
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) Error (b) 27 (c) 9
33. 33.⚡ What number does this code print?
    let marks = 11;
    marks = marks + 2;
    marks = marks - 3;
    console.log(marks);
34. 34.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, Aman! (b) name (c) Hi, name! (d) Aman
35. 35.⚡ What number does this code print?
    let runs = 23;
    runs = runs + 10;
    runs = runs - 8;
    console.log(runs);
36. 36.⚡ What number does this code print?
    let a = 14;
    let b = 13;
    console.log(a - b);
37. 37.⚡ What number does this code print?
    let a = 52;
    let b = 32;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let runs = 27;
    runs = runs + 2;
    runs = runs - 27;
    console.log(runs);
39. 39.⚡ What number does this code print?
    let a = 19;
    let b = 6;
    console.log(a - b);
40. 40.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .css (d) .html

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