List of practice Questions

The component of bacteria that retains the crystal violet stain during Gram-staining is

Which of the following organs does not produce any digestive enzymes?

How many ATP are produced when one molecule of $FADH_2$ is oxidized to $FAD$ through Electron Transport System?

If $ \alpha,\beta $ are the roots of the equation $ ax^2+bx+c = 0 $ and $ S_n = \alpha^n + \beta^n, $ then a $ S_{n+1} + bS_{n} + cS_{n-1} $ is equal to

Widal test is done to confirm

Let, $\vec {a} = - \hat {i} - \hat {k}, \vec {b} = - \hat {i} +\hat {j} $ and $\vec {c} = \hat {i}+2\hat {j}+3\hat {k} $ be three given vectors. If $\vec {r} $ is a vector such that $ \vec {r} \times \vec {b} = \vec {c} \times \vec{b} $ and $\vec {r} \cdot \vec{a} = 0 $ , then the value of $\vec {r} \cdot \vec {b} $ is

If $ \int_{0}^{\frac{\pi}{3}}\frac{cos x}{3 + 4 sin x}dx = k\, log \left(\frac{3+2\sqrt{3}}{3}\right) $ then $k$ is

Dettol contains

The susceptibility of a magnetism at $300\, K$ is $1 .2 � 10^{-5}$. The temperature at which the susceptibility increases to $ 1 .8 � 10^{-5}$ is

Negatively charged particles are called

$45\, g$ of ethylene glycol $\left(C_{2} H_{6} O_{2}\right)$ is mixed with $600\, g$ of water, what is the depression of freezing point?

What is added to the blood during haemodialysis to prevent blood clotting?

Hydrogen peroxide in its reaction with $ KIO_4 $ and $ NH_2OH $ respectively, is acting as a

A rod of length $L$ is hinged from one end. It is brought to a horizontal position and released. The angular velocity of the rod, when it is in vertical position is

$10\, g$ of a mixture of $BaO$ and $ CaO$ requires $100 \, cm^3$ of $2.5\, M\, HCl$ to react completely. The percentage of calcium oxide in the mixture is approximately (Given : molar mass of $BaO \,= \,153$)

Internal energy of a gas remains unchanged in (I) an isothermal process (II) an adiabatic process (III) a reversible process (IV) a cyclic process Which of the these are true?

Function of zinc in plants is

A body starts from rest and moves with constant acceleration for $t \,s$. It travels a distance $x_1$ in first half of time and $x_2$ in next half of time, then

Given is the diagrammatic representation of the sectional view of cochlea. Select the correct option regarding it.

Arrange the following materials in the increasing order of their resistivity. Copper, Platinum, Silver, Aluminium

In a given circuit, each cell has an emf of $0.15\, V$ and internal resistance of $0.25 \, \Omega $ . Find the current in the circuit.

During an experiment with a meter bridge, the galvanometer shows a null point when the jockey is pressed at $40.0\, cm$ using a standard resistance of $90 \Omega$, as show in the scale used in the meter bridge is $1\, mm$. The unknown resistance is

Heater of an electric kettle is made of a wire of length $L$ and diameter d. It takes $4$ minutes to raise the temperature of $0.5\, kg$ water by $40\, K$. This heater is replaced by a new heater having two wires of the same material, each of length $L$ and diameter $2 \,d$. The way these wires are connected is given in the options. How much time in minutes will it take to raise the temperature of the same amount of water by $40\, K$ ?

A circuit consists of three batteries of emf $E_{1}=1 \,V , E_{2}=2 \,V$ and $E_{3}=3 \,V$ and internal resistances $1 \,\Omega, 2\, \Omega$ and $1\, \Omega$ respectively which are connected in parallel as shown in the figure . The potential difference between points $P$ and $Q$ is