JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 16 · 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 show?
   let name = "Kabir";
   alert("Hello, " + name + "!"); (a) name (b) Hello, Kabir! (c) Kabir (d) Hello, name!
2. 2.⚡ Which JavaScript word repeats code? (a) let (b) for (c) if (d) alert()
3. 3.⚡ Which JavaScript word makes a new variable? (a) if (b) alert() (c) let (d) console.log()
4. 4.⚡ Which JavaScript word runs code when true? (a) console.log() (b) for (c) alert() (d) if
5. 5.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <code> (d) <script>
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 6;
   console.log(x + y); (a) Error (b) 7 (c) 16
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 3;
   console.log(x + y); (a) 33 (b) 6 (c) Error
8. 8.⚡ Where does console.log() show its output? (a) in the console (b) on the title bar (c) on the printer (d) in the address bar
9. 9.⚡ What does this code show?
   let name = "Arjun";
   alert("Hello, " + name + "!"); (a) Hello, Arjun! (b) name (c) Arjun (d) Hello, name!
10. 10.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Meera! (d) Meera
11. 11.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 3;
    apples = apples - 14;
    console.log(apples);
12. 12.⚡ What number does this code print?
    let a = 30;
    let b = 4;
    console.log(a + b);
13. 13.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .css (d) .jpg
14. 14.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) 44 (b) Error (c) 8
16. 16.⚡ Which JavaScript word writes in the console? (a) for (b) alert() (c) console.log() (d) let
17. 17.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) if (d) console.log()
18. 18.⚡ What number does this code print?
    let score = 22;
    score = score + 19;
    score = score - 16;
    console.log(score);
19. 19.⚡ What number does this code print?
    let a = 43;
    let b = 9;
    console.log(a - b);
20. 20.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) name (b) Aman (c) Hello, Aman! (d) Hello, name!
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) 68 (b) Error (c) 14
22. 22.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Riya! (d) Riya
23. 23.⚡ What number does this code print?
    let a = 6;
    let b = 3;
    console.log(a * b);
24. 24.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Riya (b) Welcome, name! (c) Welcome, Riya! (d) name
25. 25.⚡ What number does this code print?
    let a = 2;
    let b = 4;
    console.log(a * b);
26. 26.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) Hello, Riya! (c) Hello, name! (d) name
27. 27.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Meera (c) name (d) Hello, Meera!
28. 28.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Arjun (b) Well done, name! (c) name (d) Well done, Arjun!
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) 12 (b) 48 (c) Error
30. 30.⚡ What number does this code print?
    let a = 10;
    let b = 7;
    console.log(a * b);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) 10 (b) 19 (c) Error
32. 32.⚡ What number does this code print?
    let a = 55;
    let b = 21;
    console.log(a + b);
33. 33.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Aman! (d) Aman
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) Error (b) 49 (c) 13
35. 35.⚡ What number does this code print?
    let a = 49;
    let b = 13;
    console.log(a + b);
36. 36.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, Riya! (b) Hi, name! (c) Riya (d) name
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y); (a) Error (b) 57 (c) 12
38. 38.⚡ What number does this code print?
    let a = 6;
    let b = 20;
    console.log(a + b);
39. 39.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, Kabir! (b) Hi, name! (c) Kabir (d) name
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 9;
    console.log(x + y); (a) 14 (b) 59 (c) Error

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