JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 785 · 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 = 12;
   let b = 10;
   console.log(a * b);
2. 2.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) actions and changes (d) only colours
3. 3.⚡ What does this code show?
   let name = "Aman";
   alert("Welcome, " + name + "!"); (a) Aman (b) Welcome, Aman! (c) name (d) Welcome, name!
4. 4.⚡ What number does this code print?
   let a = 22;
   let b = 20;
   console.log(a + b);
5. 5.⚡ What does this code show?
   let name = "Riya";
   console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Riya! (c) Riya (d) name
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 1;
   console.log(x + y); (a) Error (b) 3 (c) 21
7. 7.⚡ Which JavaScript word writes in the console? (a) console.log() (b) let (c) for (d) alert()
8. 8.⚡ 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
9. 9.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) console.log() (d) alert()
10. 10.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <js> (d) <script>
11. 11.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 8;
    apples = apples - 3;
    console.log(apples);
12. 12.⚡ What number does this code print?
    let runs = 22;
    runs = runs + 14;
    runs = runs - 2;
    console.log(runs);
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) 91 (b) 10 (c) Error
14. 14.⚡ What number does this code print?
    let a = 37;
    let b = 18;
    console.log(a - b);
15. 15.⚡ Which JavaScript word repeats code? (a) if (b) console.log() (c) alert() (d) for
16. 16.⚡ What number does this code print?
    let score = 17;
    score = score + 13;
    score = score - 1;
    console.log(score);
17. 17.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) for (d) alert()
18. 18.⚡ What number does this code print?
    let coins = 28;
    coins = coins + 20;
    coins = coins - 31;
    console.log(coins);
19. 19.⚡ What number does this code print?
    let a = 21;
    let b = 12;
    console.log(a + b);
20. 20.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Hello, Arjun! (b) Hello, name! (c) Arjun (d) name
21. 21.⚡ What number does this code print?
    let a = 52;
    let b = 38;
    console.log(a - b);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) 11 (b) Error (c) 56
23. 23.⚡ 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
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) Error (b) 96 (c) 15
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 does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, Kabir! (c) Well done, name! (d) Kabir
27. 27.⚡ Which JavaScript word runs code when true? (a) console.log() (b) if (c) let (d) alert()
28. 28.⚡ What number does this code print?
    let coins = 9;
    coins = coins + 9;
    coins = coins - 8;
    console.log(coins);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) 23 (b) 5 (c) Error
30. 30.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Arjun (c) name (d) Well done, Arjun!
31. 31.⚡ What number does this code print?
    let runs = 28;
    runs = runs + 6;
    runs = runs - 21;
    console.log(runs);
32. 32.⚡ What number does this code print?
    let a = 10;
    let b = 2;
    console.log(a * b);
33. 33.⚡ What does alert() show? (a) a new tab (b) a table (c) a picture (d) a pop-up box
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) 73 (b) Error (c) 10
35. 35.⚡ What number does this code print?
    let a = 39;
    let b = 7;
    console.log(a - b);
36. 36.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Kabir (b) name (c) Hi, Kabir! (d) Hi, name!
37. 37.⚡ What number does this code print?
    let a = 8;
    let b = 8;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let a = 21;
    let b = 1;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let a = 52;
    let b = 11;
    console.log(a + b);
40. 40.⚡ What number does this code print?
    let a = 10;
    let b = 40;
    console.log(a + b);

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