Arts (English Medium) कक्षा ११ - CBSE Question Bank Solutions

The reflection of the point (α, β, γ) in the xy-plane is ______.

A plane passes through the points (2, 0, 0) (0, 3, 0) and (0, 0, 4). The equation of plane is ______.

The equation of a line, which is parallel to `2hati + hatj + 3hatk` and which passes through the point (5, –2, 4), is `(x - 5)/2 = (y + 2)/(-1) = (z - 4)/3`.

Prove by direct method that for any integer ‘n’, n³ – n is always even.

Prove by direct method that for any real numbers x, y if x = y, then x² = y².

Identify whether the following set is finite or infinite.

The set of months of a year

Identify whether the following set is finite or infinite.

{1, 2, 3, ...}

Identify whether the following set is finite or infinite.

{1, 2, 3, ... 99, 100}

Identify whether the following set is finite or infinite.

The set of positive integers greater than 100.

Identify whether the following set is finite or infinite.

The set of prime numbers less than 99.

State whether the following set is finite or infinite:

The set of lines which are parallel to the x-axis.

State whether the following set is finite or infinite:

The set of letters in the English alphabet.

State whether the following set is finite or infinite:

The set of numbers which are multiple of 5.

State whether the following set is finite or infinite:

The set of animals living on the earth.

State whether the following set is finite or infinite:

The set of circles passing through the origin (0, 0).

Find sets A, B and C such that A ∩ B, B ∩ C and A ∩ C are non-empty sets and A ∩ B ∩ C = Φ.

Find `sin  x/2, cos  x/2 and tan  x/2` of the following

`tan x = -4/3`, x in quadrant II

Find `sin  x/2, cos  x/2 and tan  x/2` of the following:

`cos x =  -1/3`, x in quadrant III

Find `sin  x/2, cos  x/2 and tan  x/2` of the following:

`sin x =  1/4`, x in quadrant II