JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 735 · 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 shows a pop-up box? (a) if (b) let (c) alert() (d) console.log()
2. 2.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .html (d) .js
3. 3.⚡ Which JavaScript word runs code when true? (a) console.log() (b) let (c) if (d) alert()
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 1;
   console.log(x + y); (a) Error (b) 81 (c) 9
5. 5.⚡ Which JavaScript word makes a new variable? (a) let (b) alert() (c) if (d) for
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 8;
   console.log(x + y); (a) 11 (b) 38 (c) Error
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 3;
   console.log(x + y); (a) Error (b) 13 (c) 4
8. 8.⚡ What number does this code print?
   let runs = 28;
   runs = runs + 14;
   runs = runs - 26;
   console.log(runs);
9. 9.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) the page title (d) actions and changes
10. 10.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
11. 11.⚡ What number does this code print?
    let a = 12;
    let b = 16;
    console.log(a + b);
12. 12.⚡ What number does this code print?
    let a = 6;
    let b = 8;
    console.log(a * b);
13. 13.⚡ Which JavaScript word writes in the console? (a) console.log() (b) alert() (c) for (d) if
14. 14.⚡ What number does this code print?
    let a = 47;
    let b = 14;
    console.log(a + b);
15. 15.⚡ What number does this code print?
    let a = 10;
    let b = 2;
    console.log(a * b);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) 11 (b) Error (c) 92
17. 17.⚡ Which JavaScript word repeats code? (a) for (b) alert() (c) let (d) if
18. 18.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) name (b) Meera (c) Well done, Meera! (d) Well done, name!
19. 19.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Kabir! (c) Kabir (d) Welcome, name!
20. 20.⚡ What number does this code print?
    let score = 22;
    score = score + 5;
    score = score - 2;
    console.log(score);
21. 21.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Arjun (b) Hello, Arjun! (c) name (d) Hello, name!
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y); (a) Error (b) 65 (c) 11
23. 23.⚡ What number does this code print?
    let marks = 22;
    marks = marks + 5;
    marks = marks - 20;
    console.log(marks);
24. 24.⚡ What number does this code print?
    let a = 40;
    let b = 32;
    console.log(a + b);
25. 25.⚡ What number does this code print?
    let a = 54;
    let b = 34;
    console.log(a + b);
26. 26.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Zoya (d) Hi, Zoya!
27. 27.⚡ What number does this code print?
    let apples = 22;
    apples = apples + 3;
    apples = apples - 15;
    console.log(apples);
28. 28.⚡ What number does this code print?
    let apples = 15;
    apples = apples + 12;
    apples = apples - 7;
    console.log(apples);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) Error (b) 11 (c) 83
30. 30.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 6;
    apples = apples - 3;
    console.log(apples);
31. 31.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a table (d) a new tab
32. 32.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Kabir! (d) Kabir
33. 33.⚡ What number does this code print?
    let score = 12;
    score = score + 18;
    score = score - 8;
    console.log(score);
34. 34.⚡ What number does this code print?
    let a = 10;
    let b = 11;
    console.log(a * b);
35. 35.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, Aman! (b) Hi, name! (c) name (d) Aman
36. 36.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) name (b) Arjun (c) Well done, Arjun! (d) Well done, name!
37. 37.⚡ What number does this code print?
    let a = 39;
    let b = 21;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let score = 17;
    score = score + 16;
    score = score - 26;
    console.log(score);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) 10 (b) 28 (c) Error
40. 40.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Meera! (c) Hello, name! (d) Meera

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