JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 773 · 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 = "Zoya";
   alert("Welcome, " + name + "!"); (a) Zoya (b) Welcome, name! (c) name (d) Welcome, Zoya!
2. 2.⚡ What does this code show?
   let name = "Kabir";
   alert("Hi, " + name + "!"); (a) Hi, Kabir! (b) Hi, name! (c) Kabir (d) name
3. 3.⚡ What number does this code print?
   let a = 7;
   let b = 7;
   console.log(a * b);
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 8;
   console.log(x + y); (a) 17 (b) 98 (c) Error
5. 5.⚡ What does this code show?
   let name = "Riya";
   console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Riya! (c) Riya (d) Welcome, name!
6. 6.⚡ Which JavaScript word writes in the console? (a) alert() (b) for (c) console.log() (d) if
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 9;
   console.log(x + y); (a) 39 (b) 12 (c) Error
8. 8.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .css (d) .js
9. 9.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the domain name (c) only colours (d) the page title
10. 10.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <script> (d) <style>
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 6 (b) Error (c) 33
12. 12.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) name (b) Aman (c) Welcome, Aman! (d) Welcome, name!
13. 13.⚡ What number does this code print?
    let a = 7;
    let b = 11;
    console.log(a * b);
14. 14.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 4;
    apples = apples - 4;
    console.log(apples);
15. 15.⚡ What number does this code print?
    let a = 27;
    let b = 23;
    console.log(a - b);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) 55 (b) Error (c) 10
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) Error (b) 36 (c) 9
18. 18.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, Aman! (b) name (c) Hello, name! (d) Aman
19. 19.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) name (b) Zoya (c) Hi, name! (d) Hi, Zoya!
20. 20.⚡ What number does this code print?
    let a = 55;
    let b = 36;
    console.log(a + b);
21. 21.⚡ What does alert() show? (a) a new tab (b) a picture (c) a table (d) a pop-up box
22. 22.⚡ What number does this code print?
    let score = 6;
    score = score + 8;
    score = score - 13;
    console.log(score);
23. 23.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, Aman! (b) name (c) Hi, name! (d) Aman
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) Error (b) 7 (c) 25
25. 25.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Kabir (b) Well done, name! (c) name (d) Well done, Kabir!
26. 26.⚡ What number does this code print?
    let score = 25;
    score = score + 16;
    score = score - 10;
    console.log(score);
27. 27.⚡ What number does this code print?
    let marks = 22;
    marks = marks + 10;
    marks = marks - 7;
    console.log(marks);
28. 28.⚡ What number does this code print?
    let a = 51;
    let b = 12;
    console.log(a - b);
29. 29.⚡ Which word makes a new variable? (a) give (b) let (c) make (d) put
30. 30.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Hello, Arjun! (b) Arjun (c) name (d) Hello, name!
31. 31.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Arjun (c) name (d) Well done, Arjun!
32. 32.⚡ What number does this code print?
    let a = 8;
    let b = 20;
    console.log(a + b);
33. 33.⚡ What number does this code print?
    let coins = 15;
    coins = coins + 13;
    coins = coins - 1;
    console.log(coins);
34. 34.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Riya (c) Hello, Riya! (d) name
35. 35.⚡ What number does this code print?
    let a = 8;
    let b = 19;
    console.log(a + b);
36. 36.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) on the title bar (d) in the console
37. 37.⚡ What number does this code print?
    let a = 39;
    let b = 19;
    console.log(a - b);
38. 38.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Welcome, Arjun! (b) Arjun (c) Welcome, name! (d) name
39. 39.⚡ What number does this code print?
    let a = 21;
    let b = 6;
    console.log(a - b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) 15 (b) Error (c) 69

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