JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 982 · 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 a = 33;
   let b = 33;
   console.log(a + b);
2. 2.⚡ 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
3. 3.⚡ What does this code show?
   let name = "Riya";
   alert("Hello, " + name + "!"); (a) Riya (b) name (c) Hello, name! (d) Hello, Riya!
4. 4.⚡ What number does this code print?
   let a = 58;
   let b = 36;
   console.log(a - b);
5. 5.⚡ What number does this code print?
   let a = 15;
   let b = 2;
   console.log(a + b);
6. 6.⚡ What number does this code print?
   let a = 59;
   let b = 40;
   console.log(a - b);
7. 7.⚡ Which word makes a new variable? (a) make (b) let (c) give (d) put
8. 8.⚡ What number does this code print?
   let a = 6;
   let b = 26;
   console.log(a + b);
9. 9.⚡ What number does this code print?
   let a = 27;
   let b = 21;
   console.log(a + b);
10. 10.⚡ 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
11. 11.⚡ What number does this code print?
    let coins = 8;
    coins = coins + 5;
    coins = coins - 3;
    console.log(coins);
12. 12.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .html (d) .css
13. 13.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Aman (b) Hi, Aman! (c) name (d) Hi, name!
14. 14.⚡ What number does this code print?
    let a = 12;
    let b = 2;
    console.log(a * b);
15. 15.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, Riya! (b) name (c) Hello, name! (d) Riya
16. 16.⚡ What number does this code print?
    let a = 11;
    let b = 4;
    console.log(a * b);
17. 17.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) console.log() (d) for
18. 18.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Well done, Zoya! (b) Well done, name! (c) name (d) Zoya
19. 19.⚡ What number does this code print?
    let marks = 22;
    marks = marks + 15;
    marks = marks - 22;
    console.log(marks);
20. 20.⚡ Which JavaScript word writes in the console? (a) if (b) console.log() (c) for (d) alert()
21. 21.⚡ What number does this code print?
    let a = 32;
    let b = 10;
    console.log(a - b);
22. 22.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <style> (d) <script>
23. 23.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) Hello, Aman! (c) name (d) Hello, name!
24. 24.⚡ What number does this code print?
    let apples = 19;
    apples = apples + 8;
    apples = apples - 4;
    console.log(apples);
25. 25.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) console.log() (d) alert()
26. 26.⚡ What number does this code print?
    let a = 7;
    let b = 5;
    console.log(a * b);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) Error (b) 77 (c) 14
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) 42 (b) Error (c) 6
29. 29.⚡ What number does this code print?
    let a = 5;
    let b = 12;
    console.log(a * b);
30. 30.⚡ What number does this code print?
    let a = 2;
    let b = 3;
    console.log(a * b);
31. 31.⚡ Which JavaScript word runs code when true? (a) let (b) console.log() (c) alert() (d) if
32. 32.⚡ What number does this code print?
    let a = 5;
    let b = 3;
    console.log(a * b);
33. 33.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Zoya! (c) Zoya (d) name
34. 34.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, Kabir! (b) name (c) Kabir (d) Hello, name!
35. 35.⚡ What number does this code print?
    let apples = 22;
    apples = apples + 6;
    apples = apples - 18;
    console.log(apples);
36. 36.⚡ What number does this code print?
    let a = 41;
    let b = 37;
    console.log(a - b);
37. 37.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 19;
    apples = apples - 16;
    console.log(apples);
38. 38.⚡ What number does this code print?
    let a = 12;
    let b = 11;
    console.log(a * b);
39. 39.⚡ What number does this code print?
    let apples = 15;
    apples = apples + 19;
    apples = apples - 17;
    console.log(apples);
40. 40.⚡ What number does this code print?
    let coins = 8;
    coins = coins + 6;
    coins = coins - 8;
    console.log(coins);

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