JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 864 · 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 = 28;
   console.log(a + b);
2. 2.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) console.log() (d) if
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 5;
   console.log(x + y); (a) 7 (b) 25 (c) Error
4. 4.⚡ 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
5. 5.⚡ Which JavaScript word shows a pop-up box? (a) let (b) for (c) alert() (d) if
6. 6.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hello, " + name + "!"); (a) Zoya (b) name (c) Hello, Zoya! (d) Hello, name!
7. 7.⚡ What does alert() show? (a) a table (b) a picture (c) a pop-up box (d) a new tab
8. 8.⚡ What number does this code print?
   let a = 19;
   let b = 1;
   console.log(a - b);
9. 9.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) only colours (d) actions and changes
10. 10.⚡ What number does this code print?
    let a = 15;
    let b = 6;
    console.log(a - b);
11. 11.⚡ What number does this code print?
    let a = 24;
    let b = 38;
    console.log(a + b);
12. 12.⚡ What number does this code print?
    let a = 6;
    let b = 3;
    console.log(a * b);
13. 13.⚡ What number does this code print?
    let a = 47;
    let b = 15;
    console.log(a + b);
14. 14.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) console.log() (d) let
15. 15.⚡ What number does this code print?
    let a = 3;
    let b = 11;
    console.log(a * b);
16. 16.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Kabir! (d) Kabir
17. 17.⚡ What number does this code print?
    let a = 11;
    let b = 2;
    console.log(a * b);
18. 18.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Arjun (b) name (c) Hi, name! (d) Hi, Arjun!
19. 19.⚡ What number does this code print?
    let a = 22;
    let b = 5;
    console.log(a - b);
20. 20.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Kabir (c) name (d) Welcome, Kabir!
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 8 (b) 35 (c) Error
22. 22.⚡ What number does this code print?
    let score = 7;
    score = score + 11;
    score = score - 15;
    console.log(score);
23. 23.⚡ What number does this code print?
    let apples = 27;
    apples = apples + 20;
    apples = apples - 30;
    console.log(apples);
24. 24.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) name (b) Arjun (c) Hi, name! (d) Hi, Arjun!
25. 25.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, Aman! (b) name (c) Aman (d) Hi, name!
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) 12 (b) 66 (c) Error
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) 6 (b) 15 (c) Error
28. 28.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Kabir! (c) name (d) Kabir
29. 29.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <script> (d) <style>
30. 30.⚡ Which JavaScript word repeats code? (a) for (b) alert() (c) if (d) console.log()
31. 31.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) if (c) let (d) alert()
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) 10 (b) Error (c) 64
33. 33.⚡ What number does this code print?
    let a = 37;
    let b = 6;
    console.log(a + b);
34. 34.⚡ What number does this code print?
    let a = 59;
    let b = 9;
    console.log(a - b);
35. 35.⚡ What number does this code print?
    let a = 42;
    let b = 31;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let a = 20;
    let b = 10;
    console.log(a - b);
37. 37.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Aman! (c) Hello, name! (d) Aman
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y); (a) 54 (b) Error (c) 9
39. 39.⚡ What number does this code print?
    let a = 37;
    let b = 5;
    console.log(a - b);
40. 40.⚡ What number does this code print?
    let runs = 10;
    runs = runs + 20;
    runs = runs - 9;
    console.log(runs);

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