Science (English Medium) इयत्ता १२ - CBSE Important Questions

Write a python program to plot a line chart based on the given data to depict the changing weekly average temperature in Delhi for four weeks.

Week=[1,2,3,4]
Avg_week_temp=[40,42,38,44]

Which of the following is not an example of a browser?

Assertion (A): Internet cookies are text files that contain small pieces of data, like a username, password, and user preferences while surfing the internet.

Reasoning (R): To make browsing the Internet faster & easier, it is required to store certain information on the server’s computer.

Prime Computer Services Ltd. is an international educational organization. It is planning to set up its India campus in Mumbai with its head office in Delhi. The Mumbai office campus has four main buildings-ADMIN, ACCOUNTS, EXAMINATION, and RESULT.

You as a network expert have to suggest the best network-related solutions for the problems given below, keeping in mind the distances between the buildings and other given parameters.

Shortest distances between various buildings:

The number of computers installed at various buildings is as follows:

1. Suggest the most appropriate location of the server inside the MUMBAI campus (out of the four buildings) to get the best connectivity for the maximum number of computers. Justify your answer.
2. Suggest and draw cable layouts to efficiently connect various buildings within the MUMBAI campus for wired connectivity.
3. Which networking device will you suggest to be procured by the company to interconnect all the computers of various buildings of the MUMBAI campus?
4. The company is planning to get its website designed which will allow students to see their results after registering themselves on its server. Out of the static or dynamic, which type of website will you suggest?
5. Which of the following will you suggest to establish online face-to-face communication between the people in the ADMIN office of the Mumbai campus and the Delhi head office?
   a) Cable TV
   b) Email
   c) Video conferencing
   d) Text chat

'O' in FOSS stands for ______.

Which of the following is not a type of cybercrime?

What is an example of e-waste?

Legal term to describe the rights of a creator of original creative or artistic work is ______.

______ is the trail of data we leave behind when we visit any website (or use any online application or portal) to fill in data or perform any transaction.

List any four benefits of e-waste management.

Mention any four net etiquettes.

1. What is this happening to Nadar?
2. What immediate action should she take to handle it?
3. Is there any law in India to handle such issues? Discuss briefly.

What do you understand by plagiarism?

Why is plagiarism a punishable offence?

Show that the function f in `A=R-{2/3} ` defined as `f(x)=(4x+3)/(6x-4)` is one-one and onto hence find f^-1

If the function f : R → R be defined by f(x) = 2x − 3 and g : R → R by g(x) = x³ + 5, then find the value of (fog)⁻¹ (x).

Let f : W → W be defined as

`f(n)={(n-1, " if n is odd"),(n+1, "if n is even") :}`

Show that f is invertible a nd find the inverse of f. Here, W is the set of all whole
numbers.

Show that the function f : R → {x ∈ R : –1 < x < 1} defined by f(x) = `x/(1 + |x|)`, x ∈ R is one-one and onto function.

Let R = {(a, a³) : a is a prime number less than 5} be a relation. Find the range of R.

 If f, g : R → R be two functions defined as f(x) = |x| + x and g(x) = |x|- x, ∀x∈R" .Then find fog and gof. Hence find fog(–3), fog(5) and gof (–2).