JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 552 · 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 = 32;
   let b = 11;
   console.log(a - b);
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 6;
   console.log(x + y); (a) 66 (b) 12 (c) Error
3. 3.⚡ Which word makes a new variable? (a) let (b) give (c) put (d) make
4. 4.⚡ What number does this code print?
   let a = 2;
   let b = 11;
   console.log(a * b);
5. 5.⚡ What number does this code print?
   let marks = 20;
   marks = marks + 18;
   marks = marks - 13;
   console.log(marks);
6. 6.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <script> (d) <js>
7. 7.⚡ Which JavaScript word shows a pop-up box? (a) for (b) let (c) if (d) alert()
8. 8.⚡ Which JavaScript word writes in the console? (a) if (b) let (c) alert() (d) console.log()
9. 9.⚡ What number does this code print?
   let coins = 17;
   coins = coins + 20;
   coins = coins - 37;
   console.log(coins);
10. 10.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 7;
    apples = apples - 10;
    console.log(apples);
11. 11.⚡ What number does this code print?
    let a = 39;
    let b = 33;
    console.log(a - b);
12. 12.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Arjun (c) Hello, Arjun! (d) name
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) 12 (b) Error (c) 48
14. 14.⚡ What number does this code print?
    let a = 47;
    let b = 26;
    console.log(a - b);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) Error (b) 12 (c) 3
16. 16.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) if (d) alert()
17. 17.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, Riya! (b) Hello, name! (c) Riya (d) name
18. 18.⚡ What number does this code print?
    let a = 31;
    let b = 4;
    console.log(a - b);
19. 19.⚡ What number does this code print?
    let a = 11;
    let b = 34;
    console.log(a + b);
20. 20.⚡ What number does this code print?
    let a = 11;
    let b = 25;
    console.log(a + b);
21. 21.⚡ What number does this code print?
    let a = 43;
    let b = 19;
    console.log(a + b);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y); (a) 98 (b) 17 (c) Error
23. 23.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) alert() (d) for
24. 24.⚡ Which JavaScript word repeats code? (a) for (b) let (c) if (d) console.log()
25. 25.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) on the title bar (d) in the console
26. 26.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) the page title (d) only colours
27. 27.⚡ What number does this code print?
    let a = 24;
    let b = 17;
    console.log(a - b);
28. 28.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Riya! (d) Riya
29. 29.⚡ What number does this code print?
    let a = 58;
    let b = 8;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let a = 48;
    let b = 33;
    console.log(a + b);
31. 31.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) 85 (b) Error (c) 13
33. 33.⚡ What number does this code print?
    let apples = 30;
    apples = apples + 12;
    apples = apples - 32;
    console.log(apples);
34. 34.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Kabir (d) Hello, Kabir!
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) 36 (b) Error (c) 9
36. 36.⚡ What number does this code print?
    let marks = 20;
    marks = marks + 5;
    marks = marks - 7;
    console.log(marks);
37. 37.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Aman (c) name (d) Hi, Aman!
38. 38.⚡ What number does this code print?
    let apples = 14;
    apples = apples + 13;
    apples = apples - 8;
    console.log(apples);
39. 39.⚡ What number does this code print?
    let a = 10;
    let b = 11;
    console.log(a * b);
40. 40.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Zoya! (d) Zoya

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