List of practice Questions

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 $Y$ ?
The resistance of tungsten filament at $150^{\circ} C$ is $133 \Omega$ what will be its resistance at $500^{\circ} C$ ? The temperature coefficient of resistance of tungsten is $0.0045 /{ }^{\circ} C$.
The resistance of the series combination of two resistances is $S$. When they are joined in parallel through total resistance is $P$. If $S = nP$, then the minimum possible value of $n$ is
The thermistors are usually made of
0.004 MNa$_2SO_4$ is isotonic with 0.01 M glucose. Degree of dissociation of Na$_2SO_4$ is
Vapour pressure of dilute aqueous solution of glucose is $750\, mm$ of mercury at $373\, K$. The mole fraction of solute is
Blood cells do not shrink in blood because blood is
Which of the following solutions will have the highest boiling point ?
Camphor is often used in molecular mass determination because
For which of the following parameters the structural isomers $C_2H_5OH$ and $CH_3OCH_3$ would be expected to have the same values? (Assume ideal behaviour)
A block P of mass m is placed on a horizontal frictionless plane. A second block of same mass m is placed on it and is connected to a spring of spring constant k, the two blocks are pulled by a distance A. Block Q oscillates without slipping. What is the maximum value of frictional force between the two blocks?
A spring has length $I$ and spring constant $k$. If spring is divided in two equal pans then spring constant of each part is: