JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 996 · 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 = "Zoya";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Zoya (d) Hello, Zoya!
2. 2.⚡ What number does this code print?
   let a = 7;
   let b = 12;
   console.log(a * b);
3. 3.⚡ What does this code show?
   let name = "Kabir";
   alert("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) Welcome, name! (c) Kabir (d) name
4. 4.⚡ Which JavaScript word writes in the console? (a) if (b) for (c) console.log() (d) let
5. 5.⚡ What number does this code print?
   let runs = 25;
   runs = runs + 4;
   runs = runs - 21;
   console.log(runs);
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 2;
   console.log(x + y); (a) 32 (b) 5 (c) Error
7. 7.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hi, " + name + "!"); (a) name (b) Kabir (c) Hi, Kabir! (d) Hi, name!
8. 8.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) actions and changes (d) only colours
9. 9.⚡ What number does this code print?
   let a = 8;
   let b = 4;
   console.log(a * b);
10. 10.⚡ What number does this code print?
    let runs = 24;
    runs = runs + 4;
    runs = runs - 27;
    console.log(runs);
11. 11.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) alert() (c) let (d) if
12. 12.⚡ What number does this code print?
    let a = 23;
    let b = 18;
    console.log(a + b);
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) 7 (b) Error (c) 34
14. 14.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) console.log() (d) let
15. 15.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <js> (d) <script>
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) 9 (b) Error (c) 18
17. 17.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Zoya (b) Hi, Zoya! (c) Hi, name! (d) name
18. 18.⚡ What number does this code print?
    let a = 13;
    let b = 40;
    console.log(a + b);
19. 19.⚡ 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
20. 20.⚡ What number does this code print?
    let a = 41;
    let b = 19;
    console.log(a - b);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 9 (b) Error (c) 72
22. 22.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .js (d) .css
23. 23.⚡ What number does this code print?
    let apples = 23;
    apples = apples + 8;
    apples = apples - 29;
    console.log(apples);
24. 24.⚡ What number does this code print?
    let coins = 9;
    coins = coins + 8;
    coins = coins - 17;
    console.log(coins);
25. 25.⚡ What number does this code print?
    let runs = 19;
    runs = runs + 12;
    runs = runs - 18;
    console.log(runs);
26. 26.⚡ What number does this code print?
    let a = 30;
    let b = 24;
    console.log(a - b);
27. 27.⚡ What number does this code print?
    let a = 16;
    let b = 11;
    console.log(a - b);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) 11 (b) 29 (c) Error
29. 29.⚡ What number does this code print?
    let marks = 19;
    marks = marks + 5;
    marks = marks - 1;
    console.log(marks);
30. 30.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Meera! (c) name (d) Meera
31. 31.⚡ What number does this code print?
    let a = 19;
    let b = 13;
    console.log(a + b);
32. 32.⚡ What number does this code print?
    let marks = 16;
    marks = marks + 3;
    marks = marks - 16;
    console.log(marks);
33. 33.⚡ Which JavaScript word repeats code? (a) alert() (b) if (c) console.log() (d) for
34. 34.⚡ Which word makes a new variable? (a) put (b) make (c) give (d) let
35. 35.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Meera! (d) Meera
36. 36.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) for (d) if
37. 37.⚡ What number does this code print?
    let a = 24;
    let b = 11;
    console.log(a - b);
38. 38.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Aman! (c) Aman (d) name
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) Error (b) 17 (c) 89
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) 8 (b) Error (c) 44

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