JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 948 · 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 writes in the console? (a) console.log() (b) for (c) alert() (d) if
2. 2.⚡ Which JavaScript word repeats code? (a) if (b) for (c) alert() (d) console.log()
3. 3.⚡ What does this code show?
   let name = "Aman";
   alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Aman! (c) Aman (d) name
4. 4.⚡ What does this code show?
   let name = "Kabir";
   console.log("Welcome, " + name + "!"); (a) Kabir (b) Welcome, name! (c) name (d) Welcome, Kabir!
5. 5.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) for (d) alert()
6. 6.⚡ What number does this code print?
   let a = 31;
   let b = 12;
   console.log(a - b);
7. 7.⚡ What does this code show?
   let name = "Kabir";
   alert("Welcome, " + name + "!"); (a) Kabir (b) name (c) Welcome, name! (d) Welcome, Kabir!
8. 8.⚡ What number does this code print?
   let apples = 26;
   apples = apples + 16;
   apples = apples - 13;
   console.log(apples);
9. 9.⚡ What does this code show?
   let name = "Kabir";
   alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Kabir (d) Well done, Kabir!
10. 10.⚡ What number does this code print?
    let score = 16;
    score = score + 7;
    score = score - 13;
    console.log(score);
11. 11.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Arjun (c) name (d) Well done, Arjun!
12. 12.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <style> (d) <code>
13. 13.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Arjun (c) Well done, Arjun! (d) name
14. 14.⚡ What does alert() show? (a) a new tab (b) a picture (c) a pop-up box (d) a table
15. 15.⚡ 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
16. 16.⚡ What number does this code print?
    let a = 35;
    let b = 25;
    console.log(a - b);
17. 17.⚡ What number does this code print?
    let runs = 27;
    runs = runs + 4;
    runs = runs - 21;
    console.log(runs);
18. 18.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) actions and changes (d) the page title
19. 19.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 2;
    apples = apples - 6;
    console.log(apples);
20. 20.⚡ What number does this code print?
    let a = 39;
    let b = 16;
    console.log(a - b);
21. 21.⚡ Which word makes a new variable? (a) let (b) make (c) put (d) give
22. 22.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the console (d) in the address bar
23. 23.⚡ What number does this code print?
    let a = 9;
    let b = 26;
    console.log(a + b);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) 2 (b) 11 (c) Error
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) 9 (b) 18 (c) Error
26. 26.⚡ What number does this code print?
    let score = 22;
    score = score + 5;
    score = score - 27;
    console.log(score);
27. 27.⚡ What number does this code print?
    let a = 5;
    let b = 9;
    console.log(a * b);
28. 28.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) name (b) Arjun (c) Hello, name! (d) Hello, Arjun!
29. 29.⚡ What number does this code print?
    let marks = 7;
    marks = marks + 12;
    marks = marks - 2;
    console.log(marks);
30. 30.⚡ What number does this code print?
    let a = 11;
    let b = 7;
    console.log(a * b);
31. 31.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .css (d) .html
32. 32.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, Zoya! (b) Hello, name! (c) name (d) Zoya
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) 28 (b) 10 (c) Error
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) 14 (b) Error (c) 5
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) Error (b) 29 (c) 11
36. 36.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Kabir (c) name (d) Hi, Kabir!
37. 37.⚡ Which JavaScript word makes a new variable? (a) let (b) alert() (c) if (d) for
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) 9 (b) 36 (c) Error
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) 19 (b) 10 (c) Error
40. 40.⚡ What number does this code print?
    let a = 56;
    let b = 28;
    console.log(a + b);

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