JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 806 · 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 word makes a new variable? (a) put (b) let (c) give (d) make
2. 2.⚡ Which JavaScript word makes a new variable? (a) if (b) for (c) console.log() (d) let
3. 3.⚡ What does this code show?
   let name = "Riya";
   console.log("Hello, " + name + "!"); (a) Riya (b) Hello, name! (c) Hello, Riya! (d) name
4. 4.⚡ 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
5. 5.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <style> (d) <code>
6. 6.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hi, " + name + "!"); (a) name (b) Hi, Zoya! (c) Zoya (d) Hi, name!
7. 7.⚡ What number does this code print?
   let coins = 12;
   coins = coins + 2;
   coins = coins - 12;
   console.log(coins);
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 1;
   console.log(x + y); (a) 61 (b) Error (c) 7
9. 9.⚡ Which JavaScript word runs code when true? (a) if (b) console.log() (c) let (d) alert()
10. 10.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Aman (b) Well done, name! (c) Well done, Aman! (d) name
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) 52 (b) 7 (c) Error
12. 12.⚡ What number does this code print?
    let a = 4;
    let b = 11;
    console.log(a * b);
13. 13.⚡ What number does this code print?
    let apples = 17;
    apples = apples + 7;
    apples = apples - 24;
    console.log(apples);
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y); (a) Error (b) 9 (c) 54
15. 15.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Riya (d) Hi, Riya!
16. 16.⚡ What number does this code print?
    let runs = 23;
    runs = runs + 17;
    runs = runs - 14;
    console.log(runs);
17. 17.⚡ What number does this code print?
    let runs = 28;
    runs = runs + 12;
    runs = runs - 27;
    console.log(runs);
18. 18.⚡ What number does this code print?
    let a = 37;
    let b = 17;
    console.log(a + b);
19. 19.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .jpg (d) .html
20. 20.⚡ What number does this code print?
    let runs = 21;
    runs = runs + 16;
    runs = runs - 29;
    console.log(runs);
21. 21.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) name (b) Kabir (c) Hello, Kabir! (d) Hello, name!
22. 22.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) the domain name (d) actions and changes
23. 23.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) on the title bar (d) in the console
24. 24.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 13;
    apples = apples - 17;
    console.log(apples);
25. 25.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, Arjun! (b) Well done, name! (c) Arjun (d) name
26. 26.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) for (c) if (d) let
27. 27.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, Aman! (b) Aman (c) name (d) Hello, name!
28. 28.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, Meera! (b) Well done, name! (c) name (d) Meera
29. 29.⚡ What number does this code print?
    let score = 9;
    score = score + 6;
    score = score - 5;
    console.log(score);
30. 30.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Riya (b) Well done, name! (c) name (d) Well done, Riya!
31. 31.⚡ What number does this code print?
    let a = 3;
    let b = 11;
    console.log(a * b);
32. 32.⚡ What number does this code print?
    let runs = 28;
    runs = runs + 6;
    runs = runs - 14;
    console.log(runs);
33. 33.⚡ What number does this code print?
    let a = 58;
    let b = 13;
    console.log(a + b);
34. 34.⚡ What number does this code print?
    let score = 10;
    score = score + 14;
    score = score - 14;
    console.log(score);
35. 35.⚡ What number does this code print?
    let a = 9;
    let b = 37;
    console.log(a + b);
36. 36.⚡ What does alert() show? (a) a new tab (b) a table (c) a pop-up box (d) a picture
37. 37.⚡ What number does this code print?
    let score = 22;
    score = score + 13;
    score = score - 26;
    console.log(score);
38. 38.⚡ What number does this code print?
    let a = 19;
    let b = 16;
    console.log(a - b);
39. 39.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Riya! (d) Riya
40. 40.⚡ What number does this code print?
    let a = 34;
    let b = 22;
    console.log(a - b);

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