List of practice Questions

The electric flux for Gaussian surface A that enclose the charged particles in free space is (given $q_1= - 14\, nc, q_2 = 78.85\, nC, q_3 = - 56\, nC$)

Noble gases are adsorbed by:

Senescence is the time when age associated defects are manifested. Certain genes may be undergoing sequential switching on and off during one?? life.

Synthetic polymer which resembles natural rubber is:

Potometer is used to measure:

Find out the value of current through $2\Omega$ resistance for the given circuit.

A moving coil galvanometer of resistance $100 \Omega$ is used as an ammeter using a resistance $0.1 \Omega$. The maximum deflection current in the galvanometer is $100 \mu A$. Find the current in the circuit, so that the ammeter shows maximum deflection.

A high resistance voltmeter connected across a cell reads 2 volts. When a resistance of $19 \, \Omega$ is connected in the cell circuit, voltmeter reading drops to $1.9$ volts. The internal resistance of the-cell is

A wire is stretched such that its length -increases by $0.2 \%$. Its resistance

When a current flows through a conductor, there will be increase in temperature. This is mainly due to

Two sources of equal emf are connected to an external resistance $R$. The internal resistances of the two sources are $R_1$ and $R_2 (R_2 > R_1).$ If the potential difference across the source having internal resistance $R_2$, is zero, then :

Two voltameters, one of copper and another of silver, are joined in parallel. When a total charge $q$ flows through the voltameters, equal amount of metals are deposited. If the electrochemical equivalents of copper and silver are $Z_1$ and $Z_2$ respectively, the charge which flows through the silver voltameter is :

An energy source will supply a constant current into the load, if its internal resistance is :

If an ammeter is to be used in place of a voltmeter, then we must connect with the ammeter a:

A wire when connected to 220V mains supply has power dissipation $ {{P}_{1}} $ . Now the wire is cut into two equal pieces which are connected in parallel to the same supply. Power dissipation in this case is $ {{P}_{2}} $ . Then $ {{P}_{2}}:{{P}_{1}} $ is

The resistance of hot tungsten filament is about $10$ times the cold resistance. What will be the resistance of $100\, W$ and $200\, V$ lamp, when not in use ?

The resistors are connected as shown in the figure below. Find the equivalent resistance between the points A and B.

Two concentric circular loops of radii $0.08 \, m$ and $0.1 \, m$ carry currents such that magnetic field at the centre is zero. If the current in the outer loop is $8 \, A$ clockwise, current in the inner loop is

$Na _{2} S _{2} O _{3}+ I _{2} \longrightarrow$ Product is

$50 \,mL$ of $10 \,N H_2SO_4, 25 \,mL$ of $12 \,N \,HCI$ and $40\, mL$ of $5N \,HNO_3$ are mixed and the volume of the mixture is made $1000\, mL$ by adding water. The normality of resulting solution will be

How will you separate a solution (miscible) of benzene $ +CHCl_{3}$ ?

Formalin is:

A particle on trough of a wave at any instant will come to mean position after time (T=time period)