JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 484 · 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 runs = 14;
   runs = runs + 17;
   runs = runs - 22;
   console.log(runs);
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 8;
   console.log(x + y); (a) Error (b) 10 (c) 28
3. 3.⚡ What number does this code print?
   let marks = 18;
   marks = marks + 18;
   marks = marks - 11;
   console.log(marks);
4. 4.⚡ What number does this code print?
   let a = 18;
   let b = 22;
   console.log(a + b);
5. 5.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a picture (d) a table
6. 6.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) the domain name (d) actions and changes
7. 7.⚡ What number does this code print?
   let a = 29;
   let b = 14;
   console.log(a - b);
8. 8.⚡ Which JavaScript word repeats code? (a) console.log() (b) if (c) for (d) alert()
9. 9.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the address bar (d) in the console
10. 10.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) alert() (d) if
11. 11.⚡ What number does this code print?
    let score = 6;
    score = score + 7;
    score = score - 13;
    console.log(score);
12. 12.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 11;
    apples = apples - 4;
    console.log(apples);
13. 13.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Kabir! (c) name (d) Kabir
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) 3 (b) Error (c) 21
15. 15.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Arjun (d) Welcome, Arjun!
16. 16.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) name (b) Riya (c) Well done, name! (d) Well done, Riya!
17. 17.⚡ What number does this code print?
    let coins = 7;
    coins = coins + 16;
    coins = coins - 22;
    console.log(coins);
18. 18.⚡ Which word makes a new variable? (a) put (b) give (c) let (d) make
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) Error (b) 9 (c) 81
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) Error (b) 62 (c) 8
21. 21.⚡ What number does this code print?
    let a = 44;
    let b = 27;
    console.log(a - b);
22. 22.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Riya (b) Welcome, Riya! (c) name (d) Welcome, name!
23. 23.⚡ What number does this code print?
    let a = 5;
    let b = 4;
    console.log(a * b);
24. 24.⚡ What number does this code print?
    let a = 11;
    let b = 11;
    console.log(a * b);
25. 25.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) let (d) console.log()
26. 26.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Arjun (b) Hello, Arjun! (c) name (d) Hello, name!
27. 27.⚡ What number does this code print?
    let apples = 27;
    apples = apples + 16;
    apples = apples - 13;
    console.log(apples);
28. 28.⚡ What number does this code print?
    let runs = 27;
    runs = runs + 3;
    runs = runs - 28;
    console.log(runs);
29. 29.⚡ What number does this code print?
    let a = 30;
    let b = 17;
    console.log(a - b);
30. 30.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <script> (d) <code>
31. 31.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Hello, Arjun! (b) name (c) Arjun (d) Hello, name!
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) 17 (b) 89 (c) Error
33. 33.⚡ What number does this code print?
    let a = 19;
    let b = 2;
    console.log(a + b);
34. 34.⚡ What number does this code print?
    let a = 40;
    let b = 7;
    console.log(a - b);
35. 35.⚡ What number does this code print?
    let marks = 23;
    marks = marks + 8;
    marks = marks - 24;
    console.log(marks);
36. 36.⚡ What number does this code print?
    let a = 16;
    let b = 36;
    console.log(a + b);
37. 37.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) for (d) alert()
38. 38.⚡ What number does this code print?
    let a = 13;
    let b = 25;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let a = 40;
    let b = 3;
    console.log(a - b);
40. 40.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Aman (c) Hello, Aman! (d) name

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