JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 933 · 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 makes a new variable? (a) for (b) let (c) console.log() (d) if
2. 2.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 2;
   console.log(x + y); (a) 92 (b) Error (c) 11
4. 4.⚡ What number does this code print?
   let a = 7;
   let b = 9;
   console.log(a * b);
5. 5.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hi, " + name + "!"); (a) Hi, Kabir! (b) Hi, name! (c) name (d) Kabir
6. 6.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the printer (d) on the title bar
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 2;
   console.log(x + y); (a) 10 (b) 82 (c) Error
8. 8.⚡ What number does this code print?
   let apples = 16;
   apples = apples + 10;
   apples = apples - 19;
   console.log(apples);
9. 9.⚡ What does alert() show? (a) a table (b) a new tab (c) a pop-up box (d) a picture
10. 10.⚡ What number does this code print?
    let marks = 28;
    marks = marks + 16;
    marks = marks - 31;
    console.log(marks);
11. 11.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) name (b) Zoya (c) Hello, Zoya! (d) Hello, name!
12. 12.⚡ What number does this code print?
    let a = 17;
    let b = 29;
    console.log(a + b);
13. 13.⚡ What number does this code print?
    let a = 54;
    let b = 8;
    console.log(a + b);
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 6 (b) Error (c) 33
15. 15.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) actions and changes (d) the domain name
16. 16.⚡ What number does this code print?
    let apples = 25;
    apples = apples + 16;
    apples = apples - 6;
    console.log(apples);
17. 17.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Kabir! (c) Hello, name! (d) Kabir
18. 18.⚡ What number does this code print?
    let a = 29;
    let b = 4;
    console.log(a - b);
19. 19.⚡ What number does this code print?
    let a = 57;
    let b = 17;
    console.log(a + b);
20. 20.⚡ Which JavaScript word writes in the console? (a) console.log() (b) for (c) if (d) alert()
21. 21.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Zoya (b) Hello, Zoya! (c) Hello, name! (d) name
22. 22.⚡ What number does this code print?
    let apples = 14;
    apples = apples + 12;
    apples = apples - 2;
    console.log(apples);
23. 23.⚡ What number does this code print?
    let a = 34;
    let b = 1;
    console.log(a + b);
24. 24.⚡ What number does this code print?
    let runs = 23;
    runs = runs + 4;
    runs = runs - 13;
    console.log(runs);
25. 25.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, Aman! (b) Aman (c) name (d) Hi, name!
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 3 (b) Error (c) 12
27. 27.⚡ Which JavaScript word repeats code? (a) console.log() (b) alert() (c) for (d) let
28. 28.⚡ What number does this code print?
    let a = 9;
    let b = 9;
    console.log(a * b);
29. 29.⚡ What number does this code print?
    let coins = 23;
    coins = coins + 2;
    coins = coins - 17;
    console.log(coins);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) 10 (b) Error (c) 73
31. 31.⚡ 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
32. 32.⚡ What number does this code print?
    let a = 11;
    let b = 12;
    console.log(a * b);
33. 33.⚡ Which JavaScript word shows a pop-up box? (a) let (b) if (c) console.log() (d) alert()
34. 34.⚡ What number does this code print?
    let a = 19;
    let b = 15;
    console.log(a - b);
35. 35.⚡ What number does this code print?
    let a = 25;
    let b = 20;
    console.log(a - b);
36. 36.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <js> (d) <script>
37. 37.⚡ What number does this code print?
    let a = 27;
    let b = 13;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let score = 24;
    score = score + 18;
    score = score - 35;
    console.log(score);
39. 39.⚡ What number does this code print?
    let a = 20;
    let b = 10;
    console.log(a - b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) 5 (b) Error (c) 14

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