List of practice Questions

Figure shows three resistor configurations $R_{1}, R_{2}$ and $R_{2}$ connected to $3 V$ battery. If the power dissipated by the configuration $R_{1}, R_{2}$ and $R_{3}$ is $P_{1}, P_{2}$ and $P_{3}$, respectively, then

In a potentiometer, the null point is received at $7th$ wire. If now we have to change the null point at the $9th$ wire, what should we do?

In a potentiometer, the null point is received at $7th$ wire. If now we have to change the null point at the $9th$ wire, what should we do?

A galvanometer coil has a resistance of $15\, \Omega$ and gives full scale deflection for a current of $4\, mA$. To convert it to an ammeter of range $0$ to $6\, A$

When a concentrated solution is diluted by adding more water, molarity of the solution remains unchanged. Product of moles of a solute and volume is equal to the molarity.

The pH of a $0.001 \,M$ solution of $ HCl $ is

Resistance of a conductivity cell filled with a solution of an electrolyte of concentration 0.1 M is 100 $\Omega$. The conductivity of this solution is $1.29 S m^{-1}.$. Resistance of the same cell when filled with 0.2 M of the same solution is 520 $\Omega$. The molar conductivity of 0.02 M solution of the electrolyte will be:

A body executes simple harmonic motion. The potential energy (PE), the kinetic energy (KE) and total energy (TE) are measured as function of displacement x. Which of the following statements is true?

A mass M is suspended from a spring of negligible mass. The spring is pulled a little and then released so that the mass executes SHM of time period T. If the mass is increased by m, the time period becomes $ \text{5T/3,} $ then the ratio of $ \frac{m}{M} $ is

In an SHM, kinetic and potential energies become equal when the displacement is 1/$\sqrt{2}$ times the amplitude. In SHM, kinetic energy is zero when potential energy is maximum.

The effect of temperature on reaction rate is shown by

$N _{2}(g)+3 H _{2}(g) \rightleftharpoons 2 NH _{3}(g)+22\, kcal$. The activation energy for the forward reaction is $50\, kcal$. What is the activation energy for the backward reaction?

Acid hydrolysis of sucrose is a

In the respect of the equation $ k=A{{e}^{-{{E}_{a}}/RT}} $ in chemical kinetics, which one of the following statements is correct?

For a first order reaction, to obtain a positive slope, we need to plot {where $[A]$ is the concentration of reactant $A$}

The following mechanism has been proposed for the reaction of NO with $Br_{2}$to form NOBr : $NO\left(g\right)+Br_{2} \left(g\right) \text{rightleftharpoons} NOBr_{2} \left(g\right)$ $NOBr \left(g\right)+NO \left(g\right) \to 2NOBr \left(g\right)$ If the second step is the rate determining step, the order of the reaction with respect to NO (g) is:

The radioactivity of a sample is $ {{R}_{1}} $ at a time $ {{T}_{1}} $ and $ {{R}_{2}} $ at times $ {{T}_{2}} $ . the half-life of the specimen is $T$, the number of atoms that have disintegrated at the time $ ({{T}_{2}}-{{T}_{1}}) $ is proportional to

Which one of the following is a saprophytic bryophyte?

Bryophytes have probably evolved from

In which book, Bentham and Hooker proposed their classification?

The primary protenema of moss by death and decay of cells may break into fragments. Each fragment gives rise to leafy gametophyte.

Which of the following is not feature of gymnosperms ?

Ectophloic siphonostele is found in

The phenomenon of sulphur shower in pine forest is due to