JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 147 · 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 shows a pop-up box? (a) console.log() (b) if (c) alert() (d) for
2. 2.⚡ Which word makes a new variable? (a) give (b) let (c) make (d) put
3. 3.⚡ What number does this code print?
   let a = 60;
   let b = 13;
   console.log(a + b);
4. 4.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .js (d) .css
5. 5.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) alert() (c) let (d) if
6. 6.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) actions and changes (d) the page title
7. 7.⚡ What number does this code print?
   let score = 14;
   score = score + 20;
   score = score - 32;
   console.log(score);
8. 8.⚡ What does this code show?
   let name = "Meera";
   alert("Well done, " + name + "!"); (a) Well done, name! (b) Meera (c) Well done, Meera! (d) name
9. 9.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <js> (d) <code>
10. 10.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Meera (c) Hi, Meera! (d) name
11. 11.⚡ Which JavaScript word repeats code? (a) if (b) for (c) let (d) alert()
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) Error (b) 7 (c) 25
13. 13.⚡ What number does this code print?
    let a = 12;
    let b = 6;
    console.log(a * b);
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) 48 (b) Error (c) 12
15. 15.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Welcome, name! (c) name (d) Riya
16. 16.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a picture (d) a new tab
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) Error (b) 26 (c) 8
18. 18.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) name (c) Zoya (d) Welcome, name!
19. 19.⚡ Which JavaScript word runs code when true? (a) let (b) console.log() (c) if (d) alert()
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) Error (b) 9 (c) 63
21. 21.⚡ What number does this code print?
    let a = 22;
    let b = 12;
    console.log(a - b);
22. 22.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Aman (b) Well done, Aman! (c) name (d) Well done, name!
23. 23.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) console.log() (d) for
24. 24.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Kabir (b) Hi, name! (c) Hi, Kabir! (d) name
25. 25.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Kabir (b) Hello, Kabir! (c) Hello, name! (d) name
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 43 (b) Error (c) 7
27. 27.⚡ What number does this code print?
    let a = 5;
    let b = 2;
    console.log(a * b);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 5 (b) 32 (c) Error
29. 29.⚡ What number does this code print?
    let a = 42;
    let b = 7;
    console.log(a - b);
30. 30.⚡ What number does this code print?
    let a = 17;
    let b = 12;
    console.log(a + b);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) 61 (b) 7 (c) Error
32. 32.⚡ What number does this code print?
    let a = 20;
    let b = 19;
    console.log(a + b);
33. 33.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Kabir! (c) Hi, name! (d) Kabir
34. 34.⚡ What number does this code print?
    let a = 12;
    let b = 8;
    console.log(a * b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) 53 (b) 8 (c) Error
36. 36.⚡ What number does this code print?
    let a = 23;
    let b = 11;
    console.log(a - b);
37. 37.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Riya (b) name (c) Well done, name! (d) Well done, Riya!
38. 38.⚡ What number does this code print?
    let a = 4;
    let b = 6;
    console.log(a * b);
39. 39.⚡ What number does this code print?
    let a = 7;
    let b = 2;
    console.log(a * b);
40. 40.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 19;
    apples = apples - 23;
    console.log(apples);

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