List of practice Questions

The number of students who take both the subjects mathematics and chemistry is 30. This represents 10% of the enrolment in mathematics and 12% of the enrolment in chemistry. How many students take at least one of these two subjects ?
The number of real roots of the equation $|2-|1-|x|||=1$ is
The number of real roots of $(x - 1) (x - 2) (x - 3) (x - 4) = 3$ is
The number of rectangles which we can form on a chess board is
The number of six digit numbers, whose all digits are odd (i.e., $1 , 3 , 5 , 7 , 9 )$, is
The number of plant species recorded from India, is
The number of points in $[-2\pi,2\pi]$ , the tangents at which to the curve $y = \sin x$ are perpendicular to the $y-axis$ is
The number of positive integral solutions of $ \frac {x^2 (3x-4)^3 (x-2)^4} {(x-5)^5 (2x-7)^6 }\leq 0$ is .
The number of radial nodes and angular nodes for d-orbital can be represented as
The number of pairs of consecutive odd natural numbers both of which are larger than 10, such that their sum is less than 40, is
The number of parallelograms that can be formed from a set of four parallel lines intersecting another set of three parallel lines:
The number of permutations of taking all letters and keeping the vowels of the words in the odd places is
The number of ordered pairs (x, y) satisfying $ {3^{x} . 5^{y} = 75}$ and $ {3^{y} . 5^{x} = 45}$ is
The number of P-O-H and P-H bonds in orthophosphorus acid molecule are relatively
The number of P-O-H links in orthophosphoric acid molecule is
The number of natural numbers less than $1000$ in which no two digits are repeated is
The number of nephrons in a kidney is equal to
The number of neutrons in 1.8 g of water will approximately be
The number of numbers consisting of four different digits that can be formed with the digits 0, 1, 2, 3 is :
The number of isomers ketones with formula $ {C_6H_{12}O}$ are
The number of molecules in 100m L of 0.02N $H_2SO_4$ is
The number of moles of $ {H_2}$ in 0.224 litre of hydrogen gas at STP (273 K, 1 atm) is :
The number of half filled orbitals in the valence shell of halogens is
The number of integral terms in the expansion$\left(\sqrt{3}+\sqrt[8]{5}\right)^{256}$
The number of isomers exhibited by $[Cr(NH_3)_3Cl_3]$ is