JEE Main Test 9...

When a disc is rotating with angular velocity ω, a particle situated at a distance of 4 cm just begins to slip. If the angular velocity is doubled, at what distance will the particle start to slip?

For AB bond, if per cent ionic character is plotted against electronegativity difference (X_A - X_B ) , the shape of the curve would look like

The correct curve is

NH₃ and BF₃ form an adduct readily because they form

A force F= 2.0 N acts on a particle P in the x – z plane. The force F is parallel to x-axis. The particle P (as shown in the figure) is at a distance 3 m and the line joining P with the origin makes angle 30° with the x-axis. The magnitude of torque on P w.r.t. origin O (in N–m) is

Strongest hydrogen bond is shown by

If A and B are square matrices of size n × n such that A² – B² = (A – B)(A + B), then which of the following will be always correct ?

It is seen that in proper ventilation of building, windows must be opened near the bottom and the top of the walls, so as to let pass

Which of the following has maximum number of lone pairs associated with Xe ?

A particle executes simple harmonic motion between x = –A and x = +A. The time taken for it to go from 0 to A/2 is T₁ and to go from A/2 to A is T₂. Then,

Consider the system of equations in χ, y and z as χsin 3θ - y + z = 0, χ cos 2θ + 4y + 3z = 0, 2χ + 7y + 7z = 0 and If the system has a non - trivial solution, then for integer n, values of θ are given by