List of practice Questions

Which of the following functions represents a simple harmonic oscillation?

A spring has length $l$ and spring constant $k$ . If spring is divided in two equal parts then spring constant of each part is

If a simple harmonic motion is represented by $\frac{d^{2}x}{dt^{2}}+\alpha\,x=0,$ its time period is :

In simple harmonic motion maximum velocity is at

When the kinetic energy of a body executing S.H.M. is $1 / 3$ of the potential energy. The displacement of the body is $x$ percent of the amplitude, where $x$ is :

The length of second's pendulum is $1\, m$ on earth. If mass and diameter of a planet is doubled than that of earth, then its length becomes:

Which one of the following statements) is incorrect about order of reaction?

According to law of mass action rate of a chemical reaction is proportional to :

A reaction involving two different reactants can never be

Consider an endothermic reaction $X\, \to \,Y$ with the activation energies $E_b$ and $E_f$ for the backward and forward reactions respectively. In general :

The rate constant of a reaction depends on:

The temperature coefficient of a reaction is 2. If the velocity of the reaction is 5 at 25�C, then, the velocity of the reaction at 55�C is

If $2.0 \,g$ of a radioactive isotope has a half-life of $20\, h$, the half-life of $0.25 \,g$ of the same substance is:

If $\sin A , \sin B , \cos A$ are in GP, then roots of $x ^{2}+2 x \cot B +1=0$ are always

In Chlamydomonas the meiosis occurs in :

Negatively geotropic roots are found in

Algae which form motile colony is

First vascular plant group is

Which pteridophyte is called horse-tail ?

Dominant generation in bryophytes is

Selaginella leaf possesses an adaxial out growth proximally

Having capacity of absorbing water, used to replace cotton and used as fuel

The edible dry fruit 'Chilgoza' is