JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 152 · 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 alert() show? (a) a picture (b) a pop-up box (c) a new tab (d) a table
2. 2.⚡ Which JavaScript word runs code when true? (a) if (b) for (c) console.log() (d) alert()
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 7;
   console.log(x + y); (a) Error (b) 17 (c) 8
4. 4.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) for (d) let
5. 5.⚡ Which JavaScript word repeats code? (a) if (b) for (c) console.log() (d) alert()
6. 6.⚡ Which JavaScript word makes a new variable? (a) if (b) alert() (c) let (d) console.log()
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 2;
   console.log(x + y); (a) Error (b) 5 (c) 32
8. 8.⚡ What does this code show?
   let name = "Kabir";
   console.log("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) Welcome, name! (c) name (d) Kabir
9. 9.⚡ What does this code show?
   let name = "Aman";
   alert("Hi, " + name + "!"); (a) name (b) Aman (c) Hi, Aman! (d) Hi, name!
10. 10.⚡ What number does this code print?
    let a = 6;
    let b = 5;
    console.log(a * b);
11. 11.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Zoya (b) name (c) Hello, Zoya! (d) Hello, name!
12. 12.⚡ What number does this code print?
    let a = 12;
    let b = 6;
    console.log(a * b);
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 13 (b) Error (c) 4
14. 14.⚡ What number does this code print?
    let a = 13;
    let b = 9;
    console.log(a + b);
15. 15.⚡ 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
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) Error (b) 11 (c) 2
17. 17.⚡ What number does this code print?
    let marks = 21;
    marks = marks + 18;
    marks = marks - 19;
    console.log(marks);
18. 18.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .css (d) .html
19. 19.⚡ What number does this code print?
    let a = 10;
    let b = 33;
    console.log(a + b);
20. 20.⚡ What number does this code print?
    let apples = 18;
    apples = apples + 18;
    apples = apples - 6;
    console.log(apples);
21. 21.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Kabir (d) Welcome, Kabir!
22. 22.⚡ What number does this code print?
    let apples = 29;
    apples = apples + 7;
    apples = apples - 17;
    console.log(apples);
23. 23.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) Hello, name! (c) name (d) Hello, Riya!
24. 24.⚡ What number does this code print?
    let coins = 17;
    coins = coins + 15;
    coins = coins - 9;
    console.log(coins);
25. 25.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Kabir (c) name (d) Well done, Kabir!
26. 26.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Arjun (b) name (c) Hi, name! (d) Hi, Arjun!
27. 27.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the page title (d) the domain name
28. 28.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Kabir (b) Hello, name! (c) name (d) Hello, Kabir!
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) Error (b) 6 (c) 51
30. 30.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Arjun! (d) Arjun
31. 31.⚡ What number does this code print?
    let a = 5;
    let b = 20;
    console.log(a + b);
32. 32.⚡ What number does this code print?
    let a = 2;
    let b = 10;
    console.log(a * b);
33. 33.⚡ What number does this code print?
    let a = 44;
    let b = 6;
    console.log(a + b);
34. 34.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Aman (b) Well done, name! (c) Well done, Aman! (d) name
35. 35.⚡ What number does this code print?
    let coins = 26;
    coins = coins + 6;
    coins = coins - 28;
    console.log(coins);
36. 36.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Riya! (c) Riya (d) name
37. 37.⚡ What number does this code print?
    let a = 34;
    let b = 25;
    console.log(a - b);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) Error (b) 11 (c) 38
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) Error (b) 13 (c) 58
40. 40.⚡ What number does this code print?
    let a = 28;
    let b = 4;
    console.log(a + b);

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