JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 515 · 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 runs = 29;
   runs = runs + 10;
   runs = runs - 24;
   console.log(runs);
2. 2.⚡ What does this code show?
   let name = "Arjun";
   alert("Hi, " + name + "!"); (a) Arjun (b) Hi, Arjun! (c) Hi, name! (d) name
3. 3.⚡ What number does this code print?
   let a = 8;
   let b = 35;
   console.log(a + b);
4. 4.⚡ What number does this code print?
   let a = 57;
   let b = 24;
   console.log(a + b);
5. 5.⚡ What does this code show?
   let name = "Arjun";
   alert("Well done, " + name + "!"); (a) Well done, Arjun! (b) Well done, name! (c) name (d) Arjun
6. 6.⚡ What does this code show?
   let name = "Zoya";
   console.log("Well done, " + name + "!"); (a) name (b) Well done, Zoya! (c) Zoya (d) Well done, name!
7. 7.⚡ Which JavaScript word runs code when true? (a) alert() (b) console.log() (c) for (d) if
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 2;
   console.log(x + y); (a) Error (b) 42 (c) 6
9. 9.⚡ What does this code show?
   let name = "Meera";
   console.log("Well done, " + name + "!"); (a) Well done, name! (b) Meera (c) name (d) Well done, Meera!
10. 10.⚡ What number does this code print?
    let score = 24;
    score = score + 6;
    score = score - 29;
    console.log(score);
11. 11.⚡ 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
12. 12.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 2;
    runs = runs - 8;
    console.log(runs);
13. 13.⚡ What number does this code print?
    let a = 43;
    let b = 26;
    console.log(a - b);
14. 14.⚡ What number does this code print?
    let a = 15;
    let b = 9;
    console.log(a - b);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) 52 (b) Error (c) 7
16. 16.⚡ Which JavaScript word writes in the console? (a) let (b) for (c) alert() (d) console.log()
17. 17.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Riya! (c) Hi, name! (d) Riya
18. 18.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <js> (d) <script>
19. 19.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) on the printer (d) in the address bar
20. 20.⚡ What number does this code print?
    let coins = 20;
    coins = coins + 14;
    coins = coins - 28;
    console.log(coins);
21. 21.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
22. 22.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, Riya! (b) name (c) Riya (d) Hello, name!
23. 23.⚡ What number does this code print?
    let a = 36;
    let b = 1;
    console.log(a + b);
24. 24.⚡ What number does this code print?
    let a = 11;
    let b = 10;
    console.log(a * b);
25. 25.⚡ What number does this code print?
    let a = 7;
    let b = 4;
    console.log(a * b);
26. 26.⚡ What number does this code print?
    let marks = 8;
    marks = marks + 3;
    marks = marks - 7;
    console.log(marks);
27. 27.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Zoya (b) name (c) Well done, Zoya! (d) Well done, name!
28. 28.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, Zoya! (b) Zoya (c) Hello, name! (d) name
29. 29.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) name (c) Welcome, name! (d) Zoya
30. 30.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) the domain name (d) only colours
31. 31.⚡ Which JavaScript word repeats code? (a) console.log() (b) if (c) alert() (d) for
32. 32.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Welcome, Arjun! (b) Welcome, name! (c) Arjun (d) name
33. 33.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Aman (b) Hi, name! (c) name (d) Hi, Aman!
34. 34.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, Arjun! (c) Well done, name! (d) Arjun
35. 35.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, Meera! (b) name (c) Meera (d) Hi, name!
36. 36.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .css (d) .jpg
37. 37.⚡ What number does this code print?
    let marks = 7;
    marks = marks + 20;
    marks = marks - 8;
    console.log(marks);
38. 38.⚡ What number does this code print?
    let a = 3;
    let b = 2;
    console.log(a * b);
39. 39.⚡ What number does this code print?
    let coins = 25;
    coins = coins + 17;
    coins = coins - 24;
    console.log(coins);
40. 40.⚡ What number does this code print?
    let runs = 22;
    runs = runs + 6;
    runs = runs - 18;
    console.log(runs);

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