JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 930 · 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 repeats code? (a) for (b) if (c) let (d) alert()
2. 2.⚡ What does this code show?
   let name = "Zoya";
   console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Zoya! (d) Zoya
3. 3.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .jpg (d) .js
4. 4.⚡ What number does this code print?
   let a = 30;
   let b = 9;
   console.log(a + b);
5. 5.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) the domain name (d) actions and changes
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 2;
   console.log(x + y); (a) 82 (b) Error (c) 10
7. 7.⚡ What does this code show?
   let name = "Arjun";
   alert("Hello, " + name + "!"); (a) Hello, Arjun! (b) name (c) Hello, name! (d) Arjun
8. 8.⚡ What number does this code print?
   let runs = 6;
   runs = runs + 7;
   runs = runs - 11;
   console.log(runs);
9. 9.⚡ What number does this code print?
   let a = 9;
   let b = 3;
   console.log(a * b);
10. 10.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <code> (d) <js>
11. 11.⚡ What number does this code print?
    let coins = 24;
    coins = coins + 8;
    coins = coins - 31;
    console.log(coins);
12. 12.⚡ What number does this code print?
    let score = 17;
    score = score + 20;
    score = score - 30;
    console.log(score);
13. 13.⚡ Which JavaScript word writes in the console? (a) let (b) if (c) console.log() (d) for
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) 11 (b) Error (c) 2
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 9;
    console.log(x + y); (a) Error (b) 16 (c) 79
16. 16.⚡ Which word makes a new variable? (a) put (b) make (c) give (d) let
17. 17.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, Meera! (b) Meera (c) Hi, name! (d) name
18. 18.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) in the console (d) on the printer
19. 19.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, Riya! (b) Riya (c) Hi, name! (d) name
20. 20.⚡ What number does this code print?
    let a = 44;
    let b = 13;
    console.log(a + b);
21. 21.⚡ What number does this code print?
    let score = 24;
    score = score + 15;
    score = score - 19;
    console.log(score);
22. 22.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) name (b) Riya (c) Hi, Riya! (d) Hi, name!
23. 23.⚡ Which JavaScript word runs code when true? (a) let (b) alert() (c) for (d) if
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) 39 (b) 12 (c) Error
25. 25.⚡ Which JavaScript word makes a new variable? (a) for (b) if (c) let (d) console.log()
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) Error (b) 63 (c) 9
27. 27.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) alert() (d) let
28. 28.⚡ 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
29. 29.⚡ What number does this code print?
    let score = 27;
    score = score + 14;
    score = score - 16;
    console.log(score);
30. 30.⚡ 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
31. 31.⚡ What number does this code print?
    let a = 25;
    let b = 10;
    console.log(a - b);
32. 32.⚡ What number does this code print?
    let a = 50;
    let b = 34;
    console.log(a + b);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) 13 (b) Error (c) 85
34. 34.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) name (b) Riya (c) Hello, name! (d) Hello, Riya!
35. 35.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Zoya (d) Hi, Zoya!
36. 36.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Zoya! (d) Zoya
37. 37.⚡ What number does this code print?
    let score = 13;
    score = score + 4;
    score = score - 8;
    console.log(score);
38. 38.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Kabir (c) name (d) Hello, Kabir!
39. 39.⚡ What number does this code print?
    let a = 30;
    let b = 15;
    console.log(a - b);
40. 40.⚡ What number does this code print?
    let apples = 30;
    apples = apples + 12;
    apples = apples - 3;
    console.log(apples);

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