List of practice Questions

When 2.0 g of a non-volatile solute was dissolved in 90 gm of benzene, the boiling point of benzene is raised by 0.88 K. Which of the following may be the solute ?$(K_b\, for \,benzene = 2.53 K kg mol^{-1})$

In the relation $ y=a\,\,\cos \left( \omega t-kx \right) $ ,the dimensional formula for $k$ is :

Grassland with scattered trees is called

The spring extends by $x$ on loading, then energy stored by the spring is : (if $T$ is the tension in spring and $k$ is spring constant)

RBCs are nucleated in

The rotational kinetic energy of a body is $ {{K}_{rot}} $ and its moment of inertia is $ I $ . The angular momentum of body is:

Consider the ground state of $Cr$ atom $(Z = 24)$. The number of electrons with the azimuthal quantum numbers $l =1$ and $2$ are respectively

Stainless steel does not rust because :

The reaction of $ H_{2} $ on ethene in presence of catalyst is called :

HX is a weak acid ( $ K_a = 10^{ - 5} $ ).lt forms a salt Na (0.1M) on reacting with caustic soda. The degree of hydrolysis of Na X is

An electron moving with a speed u along the positive x-axis at y = 0 enters a region of uniform magnetic field $B=-B_0 k$ which exists to the right of v-axis. The electron exits from the region after sometime with the speed v at coordinate y, then

Carbon dating is best suited for determining the age of fossils if their age in years is of the order of

Let $R = \{(1, 3), (4, 2), (2, 4), (2, 3), (3, 1)\}$ be a relation on the set $A = \{1, 2, 3, 4\}$. The relation R is

The dimension of light year is :

Given below is a representation of a kind of chromosomal mutation. What is the kind of mutation represented?

When a resistance of $\alpha\, \Omega$ is connected at the ends of a battery, its potential difference decreases from $40\, V$ to $30\, V$. The internal resistance of the battery is

For the post office box arrangement to determine the value of unknown resistance, the unknown resistance should be connected between

A galvanometer gives full scale deflection with $0.2\, A$ in a coil shown in the figure. The resistance of its coil is $ 10\,\Omega $ . How much shunt resistance is required to convert it into an ammeter to read current upto $1.8\, A$ ?

The thermo emf of a thermocouple varies with the temperature $?$ of the hot junction as $E = a \,? + b?^2$ in volts where the ratio $a/b$ is $700^{\circ}C$. If the cold junction is kept at $0^{\circ}C$, then the neutral temperature is

An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the length and radii of the wires are in the ratio of $4/3$ and $2/3$, then the ratio of the currents passing through the wire will be

A larger dry cell has higher emf. The emf of a dry cell is proportional to its size.

Current provided by a battery is maximum when:

In a metre bridge experiment null point is obtained at $20\, cm$ from one end of the wire when resistance $X$ is balanced against another resistance $Y$. If $X < Y$, then where will be the new position of the null point from the same end, if one decides to balance a resistance of $4X$ against $Y$ ?