JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 292 · 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.⚡ Which JavaScript word repeats code? (a) alert() (b) if (c) let (d) for
2. 2.⚡ 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
3. 3.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
4. 4.⚡ What number does this code print?
   let coins = 15;
   coins = coins + 18;
   coins = coins - 8;
   console.log(coins);
5. 5.⚡ What number does this code print?
   let runs = 30;
   runs = runs + 12;
   runs = runs - 5;
   console.log(runs);
6. 6.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) console.log() (d) let
7. 7.⚡ What number does this code print?
   let apples = 8;
   apples = apples + 10;
   apples = apples - 4;
   console.log(apples);
8. 8.⚡ What number does this code print?
   let a = 43;
   let b = 12;
   console.log(a + b);
9. 9.⚡ What does alert() show? (a) a table (b) a picture (c) a pop-up box (d) a new tab
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) Error (b) 15 (c) 96
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) 62 (b) 8 (c) Error
12. 12.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) the page title (d) actions and changes
13. 13.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) name (b) Riya (c) Well done, name! (d) Well done, Riya!
14. 14.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Zoya (b) Welcome, name! (c) name (d) Welcome, Zoya!
15. 15.⚡ What number does this code print?
    let apples = 13;
    apples = apples + 18;
    apples = apples - 28;
    console.log(apples);
16. 16.⚡ Which JavaScript word makes a new variable? (a) if (b) alert() (c) console.log() (d) let
17. 17.⚡ Which JavaScript word writes in the console? (a) if (b) console.log() (c) alert() (d) let
18. 18.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <js> (d) <script>
19. 19.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Kabir (c) Hello, Kabir! (d) name
20. 20.⚡ What number does this code print?
    let a = 49;
    let b = 36;
    console.log(a + b);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) Error (b) 7 (c) 25
22. 22.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Aman (c) Well done, Aman! (d) name
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) Error (b) 11 (c) 29
24. 24.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) name (b) Meera (c) Well done, Meera! (d) Well done, name!
25. 25.⚡ What number does this code print?
    let a = 56;
    let b = 26;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let coins = 19;
    coins = coins + 11;
    coins = coins - 26;
    console.log(coins);
27. 27.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Riya (d) Well done, Riya!
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) 13 (b) Error (c) 85
29. 29.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) alert() (d) if
30. 30.⚡ What number does this code print?
    let a = 44;
    let b = 31;
    console.log(a - b);
31. 31.⚡ What number does this code print?
    let a = 30;
    let b = 32;
    console.log(a + b);
32. 32.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Arjun (b) name (c) Welcome, Arjun! (d) Welcome, name!
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 8 (b) Error (c) 35
34. 34.⚡ What number does this code print?
    let runs = 13;
    runs = runs + 17;
    runs = runs - 15;
    console.log(runs);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) 15 (b) 69 (c) Error
36. 36.⚡ What number does this code print?
    let a = 22;
    let b = 14;
    console.log(a - b);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) 10 (b) 46 (c) Error
38. 38.⚡ What number does this code print?
    let a = 2;
    let b = 9;
    console.log(a * b);
39. 39.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, Meera! (b) Meera (c) name (d) Welcome, name!
40. 40.⚡ What number does this code print?
    let apples = 15;
    apples = apples + 17;
    apples = apples - 14;
    console.log(apples);

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