List of practice Questions

If a surface has a work function $4.0 \,eV$, what is the maximum velocity of electrons liberated from the surface when it is irradiated with ultraviolet radiation of wavelength $0.2\, \mu m$ ?

Galileo writes that for angles of projection of a projectile at angles $\left(45^{\circ}+\theta\right)$ and $\left(45^{\circ}-\theta\right)$, the horizontal ranges described by the projectile are in the ratio

Heating of $NH _{4} NO _{3}$ gives

The IUPAC name of the compound is

A reactant (A) forms two products : $ {A ->[k_1] B,} $ Activation Energy $Ea_1$ $ {A ->[k_2] C,}$ Activation Energy $Ea_2$ If $Ea_2 = 2 Ea_1$, then $k_1$ and $k_2$ are related as :

In the series $L-C-R$ circuit shown, the impedance is

Iron is extracted by

An intensive property is

India's first national park is

In angiosperms, transport of food and water is more efficient than gymnosperms and pteridophytes. In angiosperms longitudinally arranged sieve elements and vessels with perforated end walls are present.

Sachin and Rahul attempted to solve a quadratic equaiton. Sachin made a mistake in writing down the constant term and ended up in roots (4, 3). Rahul made a mistake in writing down coefficient of x to get roots (3, 2). The correct roots of equation are :

Sweet potato is homologous to

The basic unit of study in Ecology is

Taxonomic hierarchy refers to

Ostia are present in

$A\, 2\,V$ battery, a $15\, \Omega$ resistor and a potentiometer of $100\, cm$ length, all are connected in series. If the resistance of potentiometer wire is $5\, \Omega$ , then the potential gradient of the potentiometer wire is

A conductor wire having $10^{29}$ free electrons/$m^{3}$ carries a current of $20\,A$. If the cross-section of the wire is $1\,mm^{2}$, then the drift velocity of electrons will be ....... $(e\, =\, 1.6 \times10^{-19}C).$

A meter bridge is set-up as shown in figure, to determine an unknown resistance $X$ using a standard $10 \Omega $ resistor: The galvanometer shows null point when tapping-key is at $52\, cm$ mark. The end-corrections are $1\, cm$ and $2 \,cm$ respectively for the ends $A$ and $B$. The determined value of $X$ is

Kirchhoff's $1^{st}$ law for analysis of current at a junction in a circuit is based on

Two wires $A$ and $B$ of equal masses and of the same metal are taken. The diameter of the wire $A$ is half the diameter of the wire $B$. If the resistance of wire $A$ be $24\, \Omega $ , the resistance of $B$ will be

A uniform wire of resistance $R$, of the radius $r$ is uniformly drawn until its radius is reduced to $r/ n$, Its new resistance is

A resistor of $6 \, k \Omega$ with tolerance $10\%$ and another resistance of $4\, k \Omega$ with tolerance $10\%$ are connected in series. The tolerance of the combination is about

A solution of two liquids boils at a temperature more than the boiling point of either of them. Hence, the binary solution shows

Which of the following is an example of Maximum boiling azeotrope?

A 5% solution of cane sugar (molar mass 342) is isotonic with 1% of a solution of an unknown solute. The molar mass of unknown solute in g/mol is: