JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 150 · 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) alert() (c) if (d) console.log()
2. 2.⚡ Which word makes a new variable? (a) let (b) put (c) give (d) make
3. 3.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) alert() (d) for
4. 4.⚡ What number does this code print?
   let a = 10;
   let b = 11;
   console.log(a * b);
5. 5.⚡ What does alert() show? (a) a new tab (b) a picture (c) a table (d) a pop-up box
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 3;
   console.log(x + y); (a) Error (b) 63 (c) 9
7. 7.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) in the console (d) on the printer
8. 8.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the domain name (d) the page title
9. 9.⚡ What number does this code print?
   let coins = 27;
   coins = coins + 4;
   coins = coins - 8;
   console.log(coins);
10. 10.⚡ What number does this code print?
    let marks = 15;
    marks = marks + 4;
    marks = marks - 10;
    console.log(marks);
11. 11.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <code> (d) <js>
12. 12.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Riya! (d) Riya
13. 13.⚡ Which JavaScript word repeats code? (a) for (b) let (c) alert() (d) console.log()
14. 14.⚡ What number does this code print?
    let a = 17;
    let b = 18;
    console.log(a + b);
15. 15.⚡ What number does this code print?
    let a = 44;
    let b = 30;
    console.log(a - b);
16. 16.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) let (d) if
17. 17.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .html (d) .css
18. 18.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) let (d) alert()
19. 19.⚡ What number does this code print?
    let a = 26;
    let b = 6;
    console.log(a - b);
20. 20.⚡ What number does this code print?
    let a = 10;
    let b = 4;
    console.log(a - b);
21. 21.⚡ What number does this code print?
    let runs = 11;
    runs = runs + 4;
    runs = runs - 12;
    console.log(runs);
22. 22.⚡ What number does this code print?
    let a = 48;
    let b = 25;
    console.log(a + b);
23. 23.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Kabir! (c) Kabir (d) name
24. 24.⚡ What number does this code print?
    let score = 19;
    score = score + 20;
    score = score - 1;
    console.log(score);
25. 25.⚡ What number does this code print?
    let score = 17;
    score = score + 9;
    score = score - 2;
    console.log(score);
26. 26.⚡ What number does this code print?
    let a = 19;
    let b = 14;
    console.log(a - b);
27. 27.⚡ 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
28. 28.⚡ What number does this code print?
    let a = 49;
    let b = 4;
    console.log(a + b);
29. 29.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, Aman! (b) Aman (c) name (d) Hello, name!
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) 9 (b) 18 (c) Error
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) 4 (b) 22 (c) Error
32. 32.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Riya! (c) Riya (d) name
33. 33.⚡ What number does this code print?
    let a = 5;
    let b = 4;
    console.log(a * b);
34. 34.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Arjun (c) name (d) Welcome, Arjun!
35. 35.⚡ What number does this code print?
    let a = 2;
    let b = 4;
    console.log(a * b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) 12 (b) Error (c) 48
37. 37.⚡ What number does this code print?
    let runs = 10;
    runs = runs + 12;
    runs = runs - 22;
    console.log(runs);
38. 38.⚡ What number does this code print?
    let a = 9;
    let b = 6;
    console.log(a * b);
39. 39.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Arjun (b) Well done, name! (c) Well done, Arjun! (d) name
40. 40.⚡ What number does this code print?
    let coins = 6;
    coins = coins + 3;
    coins = coins - 7;
    console.log(coins);

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