JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 219 · 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 this code show?
   let name = "Aman";
   console.log("Welcome, " + name + "!"); (a) Aman (b) Welcome, Aman! (c) name (d) Welcome, name!
2. 2.⚡ What number does this code print?
   let books = 26;
   books = books + 3;
   books = books - 6;
   console.log(books);
3. 3.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) actions and changes (d) the domain name
4. 4.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .html (d) .jpg
5. 5.⚡ What does this code show?
   let name = "Arjun";
   console.log("Well done, " + name + "!"); (a) Well done, name! (b) Arjun (c) Well done, Arjun! (d) name
6. 6.⚡ Which word makes a new variable? (a) let (b) put (c) make (d) give
7. 7.⚡ What does alert() show? (a) a table (b) a new tab (c) a pop-up box (d) a picture
8. 8.⚡ Which JavaScript word repeats code? (a) let (b) if (c) alert() (d) for
9. 9.⚡ What number does this code print?
   let a = 3;
   let b = 2;
   console.log(a * b);
10. 10.⚡ What number does this code print?
    let a = 7;
    let b = 3;
    console.log(a * b);
11. 11.⚡ What number does this code print?
    let runs = 18;
    runs = runs + 16;
    runs = runs - 6;
    console.log(runs);
12. 12.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) if (d) alert()
13. 13.⚡ What number does this code print?
    let a = 5;
    let b = 5;
    console.log(a * b);
14. 14.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, Arjun! (b) Arjun (c) name (d) Hello, name!
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) 64 (b) Error (c) 10
16. 16.⚡ What number does this code print?
    let a = 8;
    let b = 6;
    console.log(a + b);
17. 17.⚡ What number does this code print?
    let coins = 13;
    coins = coins + 20;
    coins = coins - 28;
    console.log(coins);
18. 18.⚡ Which JavaScript word shows a pop-up box? (a) let (b) if (c) console.log() (d) alert()
19. 19.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Zoya (c) Hello, Zoya! (d) name
20. 20.⚡ Which JavaScript word runs code when true? (a) let (b) alert() (c) if (d) console.log()
21. 21.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) Zoya (c) Welcome, name! (d) name
22. 22.⚡ Which JavaScript word writes in the console? (a) alert() (b) let (c) console.log() (d) if
23. 23.⚡ What number does this code print?
    let score = 29;
    score = score + 10;
    score = score - 4;
    console.log(score);
24. 24.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Kabir (c) name (d) Hello, Kabir!
25. 25.⚡ What number does this code print?
    let a = 4;
    let b = 10;
    console.log(a * b);
26. 26.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Kabir (b) Welcome, Kabir! (c) name (d) Welcome, name!
27. 27.⚡ What number does this code print?
    let runs = 5;
    runs = runs + 8;
    runs = runs - 7;
    console.log(runs);
28. 28.⚡ What number does this code print?
    let a = 7;
    let b = 9;
    console.log(a * b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) Error (b) 10 (c) 37
30. 30.⚡ What number does this code print?
    let coins = 30;
    coins = coins + 3;
    coins = coins - 19;
    console.log(coins);
31. 31.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Arjun (b) Welcome, Arjun! (c) name (d) Welcome, name!
32. 32.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Riya (d) Hi, Riya!
33. 33.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Arjun (c) Well done, Arjun! (d) name
34. 34.⚡ What number does this code print?
    let apples = 29;
    apples = apples + 18;
    apples = apples - 24;
    console.log(apples);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 7 (b) Error (c) 43
36. 36.⚡ What number does this code print?
    let a = 3;
    let b = 4;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let a = 39;
    let b = 30;
    console.log(a - b);
38. 38.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, Meera! (b) Hi, name! (c) name (d) Meera
39. 39.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Meera (d) Well done, Meera!
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y); (a) Error (b) 75 (c) 12

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