The number of possible lines of symmetry for the following figure is

In the following figure if l1 || l2 , then the value of y is

In the following figure ABF = 140° If the line BD bisects CBE, then the value of x is

In the following figure, AB and CD are intersecting at O, and if = 40°, then the values of x and y are

If ABC is a triangle in which = = , then the measure of each of the angles is

insufficient data

Measure of in the following figure is

A particle executing SHM while moving from one extremity is found to be at distances x₁, x₂ and x₃ from the mean position at the end of three successive seconds. The time period of oscillation is ('  ' used in the following choices is given by  )

A block of mass m is suspended by different springs of force constant shown in figure. Let time period of oscillation in these four positions be and . Then
i)
ii)
iii)
iv) 

A pendulum has time period T for small oscillations. An obstacle P is situated below the point of suspension O at a distance . The pendulum is releases from rest. Throughout the motion the moving string makes small angle with vertical. Time after which the pendulum returns back to its initial position is

A mass m=8 kg is attached to a spring as shown in figure and held in position so that the spring remains unstretched. The spring constant is 200 N/m. The mass m is then released and begins to undergo small oscillations. The maximum velocity the mass will be

The two blocks of mass and are kept on a smooth horizontal table as shown in figure. Block of mass but not is fastened to the spring. If now both the blocks are pushed to the left so that the spring is compressed a distance . The amplitude of oscillation of block of mass after the system is released is

Five identical springs are used in the following three configurations. The time period of vertical oscillations in configuration (i) (ii) and (iii) are in the ratio

For the process Cu(g) →Cu+ (g) + e– , the electron is to be removed from

In the reaction, 2CuCl₂ + 2H₂O + SO₂ → A + H₂SO₄ + 2HCl ; A is

The variation of PE of a simple harmonic oscillator is as shown. Then force constant of the system is (PE 'U' is in joules, displacement ' x ' is in mm )

A particle at the end of the spring executes S.H.M with a period , while the corresponding period for another spring is . If the period of oscillation with two springs in series is ' T ', then (same particle connected in all the cases)