JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 415 · 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 = 2;
   let b = 5;
   console.log(a * b);
2. 2.⚡ Which JavaScript word shows a pop-up box? (a) for (b) alert() (c) console.log() (d) if
3. 3.⚡ Which JavaScript word repeats code? (a) console.log() (b) alert() (c) for (d) let
4. 4.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a new tab (d) a picture
5. 5.⚡ What number does this code print?
   let a = 28;
   let b = 29;
   console.log(a + b);
6. 6.⚡ Which word makes a new variable? (a) put (b) let (c) give (d) make
7. 7.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) in the console (d) on the title bar
8. 8.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the domain name (d) the page title
9. 9.⚡ What does this code show?
   let name = "Aman";
   console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Aman! (c) Aman (d) name
10. 10.⚡ What number does this code print?
    let runs = 11;
    runs = runs + 6;
    runs = runs - 17;
    console.log(runs);
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) 92 (b) Error (c) 11
12. 12.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Kabir (c) Well done, Kabir! (d) name
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 12 (b) 3 (c) Error
14. 14.⚡ What number does this code print?
    let a = 51;
    let b = 17;
    console.log(a + b);
15. 15.⚡ 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
16. 16.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) if (d) console.log()
17. 17.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) let (d) console.log()
18. 18.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Arjun (c) name (d) Hello, Arjun!
19. 19.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <style> (d) <code>
20. 20.⚡ What number does this code print?
    let a = 6;
    let b = 6;
    console.log(a * b);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) 76 (b) 13 (c) Error
22. 22.⚡ What number does this code print?
    let a = 2;
    let b = 7;
    console.log(a * b);
23. 23.⚡ What number does this code print?
    let a = 55;
    let b = 6;
    console.log(a - b);
24. 24.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, Meera! (b) Hi, name! (c) Meera (d) name
25. 25.⚡ What number does this code print?
    let a = 28;
    let b = 16;
    console.log(a + b);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) Error (b) 77 (c) 14
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) 44 (b) 8 (c) Error
28. 28.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) if (c) for (d) let
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) Error (b) 91 (c) 10
30. 30.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, Meera! (b) Welcome, name! (c) Meera (d) name
31. 31.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Zoya! (d) Zoya
32. 32.⚡ What number does this code print?
    let runs = 5;
    runs = runs + 2;
    runs = runs - 2;
    console.log(runs);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 9;
    console.log(x + y); (a) 79 (b) Error (c) 16
34. 34.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, Arjun! (b) Arjun (c) Well done, name! (d) name
35. 35.⚡ What number does this code print?
    let score = 29;
    score = score + 5;
    score = score - 1;
    console.log(score);
36. 36.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Riya (c) Hello, Riya! (d) name
37. 37.⚡ What number does this code print?
    let a = 39;
    let b = 40;
    console.log(a + b);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) Error (b) 6 (c) 42
39. 39.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Well done, Meera! (b) name (c) Well done, name! (d) Meera
40. 40.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Meera! (c) Meera (d) name

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