JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 779 · 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 number does this code print?
   let coins = 12;
   coins = coins + 11;
   coins = coins - 16;
   console.log(coins);
2. 2.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <script> (d) <style>
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 3;
   console.log(x + y); (a) Error (b) 13 (c) 4
4. 4.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) console.log() (d) if
5. 5.⚡ What number does this code print?
   let a = 12;
   let b = 8;
   console.log(a + b);
6. 6.⚡ Which JavaScript word repeats code? (a) if (b) let (c) console.log() (d) for
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 9;
   console.log(x + y); (a) 10 (b) Error (c) 19
8. 8.⚡ What does this code show?
   let name = "Aman";
   console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Aman! (d) Aman
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 4;
   console.log(x + y); (a) 14 (b) Error (c) 5
10. 10.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Riya! (c) Riya (d) name
11. 11.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Kabir (d) Hi, Kabir!
12. 12.⚡ Which word makes a new variable? (a) put (b) give (c) let (d) make
13. 13.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) actions and changes (d) only colours
14. 14.⚡ Which JavaScript word writes in the console? (a) alert() (b) if (c) console.log() (d) for
15. 15.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Aman! (d) Aman
16. 16.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) on the printer (d) in the console
17. 17.⚡ What number does this code print?
    let score = 8;
    score = score + 20;
    score = score - 26;
    console.log(score);
18. 18.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 7;
    apples = apples - 17;
    console.log(apples);
19. 19.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Kabir (b) Hi, name! (c) name (d) Hi, Kabir!
20. 20.⚡ What number does this code print?
    let marks = 30;
    marks = marks + 19;
    marks = marks - 46;
    console.log(marks);
21. 21.⚡ 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
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 8;
    console.log(x + y); (a) 78 (b) Error (c) 15
23. 23.⚡ What number does this code print?
    let coins = 17;
    coins = coins + 14;
    coins = coins - 7;
    console.log(coins);
24. 24.⚡ What number does this code print?
    let a = 7;
    let b = 6;
    console.log(a * b);
25. 25.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, Riya! (b) name (c) Riya (d) Hello, name!
26. 26.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .css (d) .html
27. 27.⚡ What number does this code print?
    let a = 10;
    let b = 3;
    console.log(a * b);
28. 28.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Well done, Zoya! (b) name (c) Zoya (d) Well done, name!
29. 29.⚡ What number does this code print?
    let a = 33;
    let b = 12;
    console.log(a - b);
30. 30.⚡ What number does this code print?
    let score = 15;
    score = score + 9;
    score = score - 13;
    console.log(score);
31. 31.⚡ What number does this code print?
    let a = 37;
    let b = 12;
    console.log(a - b);
32. 32.⚡ Which JavaScript word runs code when true? (a) if (b) alert() (c) for (d) console.log()
33. 33.⚡ What number does this code print?
    let a = 25;
    let b = 29;
    console.log(a + b);
34. 34.⚡ What number does this code print?
    let a = 5;
    let b = 3;
    console.log(a * b);
35. 35.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a table (d) a new tab
36. 36.⚡ Which JavaScript word shows a pop-up box? (a) let (b) for (c) if (d) alert()
37. 37.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Riya (c) Hi, Riya! (d) name
38. 38.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Kabir! (c) Welcome, name! (d) Kabir
39. 39.⚡ What number does this code print?
    let a = 12;
    let b = 34;
    console.log(a + b);
40. 40.⚡ What number does this code print?
    let a = 6;
    let b = 3;
    console.log(a - b);

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