JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 481 · 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 runs code when true? (a) let (b) for (c) if (d) console.log()
2. 2.⚡ What number does this code print?
   let apples = 17;
   apples = apples + 13;
   apples = apples - 13;
   console.log(apples);
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 1;
   console.log(x + y); (a) 91 (b) Error (c) 10
4. 4.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
5. 5.⚡ What number does this code print?
   let a = 13;
   let b = 3;
   console.log(a + b);
6. 6.⚡ Which JavaScript word shows a pop-up box? (a) let (b) if (c) for (d) alert()
7. 7.⚡ What does this code show?
   let name = "Zoya";
   alert("Well done, " + name + "!"); (a) Zoya (b) name (c) Well done, Zoya! (d) Well done, name!
8. 8.⚡ What number does this code print?
   let marks = 5;
   marks = marks + 11;
   marks = marks - 1;
   console.log(marks);
9. 9.⚡ 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
10. 10.⚡ What number does this code print?
    let a = 29;
    let b = 8;
    console.log(a + b);
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) Error (b) 47 (c) 11
12. 12.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) name (b) Aman (c) Well done, Aman! (d) Well done, name!
13. 13.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Zoya (c) name (d) Welcome, Zoya!
14. 14.⚡ What number does this code print?
    let runs = 15;
    runs = runs + 13;
    runs = runs - 17;
    console.log(runs);
15. 15.⚡ What number does this code print?
    let a = 5;
    let b = 10;
    console.log(a * b);
16. 16.⚡ Which word makes a new variable? (a) make (b) let (c) put (d) give
17. 17.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .js (d) .jpg
18. 18.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) console.log() (d) for
19. 19.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <style> (d) <js>
20. 20.⚡ What number does this code print?
    let score = 23;
    score = score + 6;
    score = score - 27;
    console.log(score);
21. 21.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a table (d) a picture
22. 22.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Kabir! (d) Kabir
23. 23.⚡ What number does this code print?
    let a = 18;
    let b = 26;
    console.log(a + b);
24. 24.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Kabir (b) name (c) Hello, name! (d) Hello, Kabir!
25. 25.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 2;
    apples = apples - 6;
    console.log(apples);
26. 26.⚡ What number does this code print?
    let a = 19;
    let b = 7;
    console.log(a + b);
27. 27.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 7;
    apples = apples - 9;
    console.log(apples);
28. 28.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Meera (c) Hi, Meera! (d) name
29. 29.⚡ What number does this code print?
    let coins = 8;
    coins = coins + 16;
    coins = coins - 17;
    console.log(coins);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) 13 (b) Error (c) 67
31. 31.⚡ What number does this code print?
    let a = 12;
    let b = 4;
    console.log(a + b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) 23 (b) Error (c) 5
33. 33.⚡ What number does this code print?
    let coins = 15;
    coins = coins + 10;
    coins = coins - 22;
    console.log(coins);
34. 34.⚡ What number does this code print?
    let apples = 27;
    apples = apples + 11;
    apples = apples - 37;
    console.log(apples);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) 8 (b) 26 (c) Error
36. 36.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Arjun! (d) Arjun
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y); (a) 75 (b) Error (c) 12
38. 38.⚡ What number does this code print?
    let a = 23;
    let b = 9;
    console.log(a - b);
39. 39.⚡ Which JavaScript word writes in the console? (a) console.log() (b) if (c) for (d) alert()
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) 15 (b) Error (c) 87

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