JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 327 · 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 does this code print? (Look at the quotes!)
   let x = "5";
   let y = 4;
   console.log(x + y); (a) Error (b) 9 (c) 54
2. 2.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) actions and changes (d) only colours
3. 3.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) for (d) console.log()
4. 4.⚡ Where does console.log() show its output? (a) in the console (b) on the printer (c) on the title bar (d) in the address bar
5. 5.⚡ What number does this code print?
   let a = 5;
   let b = 17;
   console.log(a + b);
6. 6.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <style> (d) <code>
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 6;
   console.log(x + y); (a) 14 (b) Error (c) 86
8. 8.⚡ What number does this code print?
   let a = 25;
   let b = 18;
   console.log(a + b);
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 3;
   console.log(x + y); (a) Error (b) 33 (c) 6
10. 10.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) name (b) Zoya (c) Hi, Zoya! (d) Hi, name!
11. 11.⚡ Which word makes a new variable? (a) let (b) make (c) put (d) give
12. 12.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) alert() (d) console.log()
13. 13.⚡ What number does this code print?
    let a = 38;
    let b = 2;
    console.log(a - b);
14. 14.⚡ What number does this code print?
    let a = 14;
    let b = 7;
    console.log(a - b);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) Error (b) 58 (c) 13
16. 16.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, Riya! (b) Hi, name! (c) name (d) Riya
17. 17.⚡ Which JavaScript word makes a new variable? (a) if (b) alert() (c) for (d) let
18. 18.⚡ What number does this code print?
    let runs = 26;
    runs = runs + 6;
    runs = runs - 21;
    console.log(runs);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) Error (b) 95 (c) 14
20. 20.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Zoya (b) name (c) Hi, Zoya! (d) Hi, name!
21. 21.⚡ What number does this code print?
    let a = 53;
    let b = 10;
    console.log(a + b);
22. 22.⚡ What number does this code print?
    let a = 8;
    let b = 7;
    console.log(a * b);
23. 23.⚡ What number does this code print?
    let a = 8;
    let b = 5;
    console.log(a * b);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) 15 (b) Error (c) 69
25. 25.⚡ What number does this code print?
    let score = 5;
    score = score + 16;
    score = score - 2;
    console.log(score);
26. 26.⚡ What number does this code print?
    let coins = 26;
    coins = coins + 3;
    coins = coins - 29;
    console.log(coins);
27. 27.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a table (d) a new tab
28. 28.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, Aman! (b) name (c) Aman (d) Hello, name!
29. 29.⚡ Which JavaScript word shows a pop-up box? (a) if (b) for (c) alert() (d) let
30. 30.⚡ What number does this code print?
    let a = 45;
    let b = 22;
    console.log(a + b);
31. 31.⚡ What number does this code print?
    let a = 9;
    let b = 5;
    console.log(a * b);
32. 32.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Arjun (c) name (d) Welcome, Arjun!
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) 61 (b) Error (c) 7
34. 34.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) name (b) Zoya (c) Hello, Zoya! (d) Hello, name!
35. 35.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Meera (b) Welcome, name! (c) name (d) Welcome, Meera!
36. 36.⚡ What number does this code print?
    let apples = 22;
    apples = apples + 3;
    apples = apples - 1;
    console.log(apples);
37. 37.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) name (b) Well done, Aman! (c) Well done, name! (d) Aman
38. 38.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Meera (d) Hi, Meera!
39. 39.⚡ What number does this code print?
    let a = 37;
    let b = 19;
    console.log(a - b);
40. 40.⚡ What number does this code print?
    let a = 14;
    let b = 6;
    console.log(a + b);

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