List of practice Questions

A heating coil is labelled 100 W, 220 V. The coil is cut in half and the two pieces are joined in parallel to the same source. The energy now liberated per second is
A $4\, \mu F$ capacitor is charged to 400 V. If its plates are joined through a resistance of $2\,k \Omega$, then heat produced in the resistance is
In the network shown in the figure, each of the resistance is equal to $2\, \Omega.$ The resistance between the points A and B is
Which of the following statements about enzymes are true?
Ten identical cells each of potential $E$ and internal resistance $r$ are connected in series to form a closed circuit. An ideal voltmeter connected across three cells, will read
The botanical name of the peepal tree is
A straight line conductor of length 0.4 m is moved with a speed of 7 m/s perpendicular to a magnetic field of intensity 0.9 Wb/$m^2$. The induced e.m.f. across the conductor is
The electronic configuration of an element is $1s^2,2s^2 2p^6,3s^2 3p^3$. What is the atomic number of the element, which is present just below the above element in the periodic table?
The figure indicates the energy level diagram of an atom and the origin of six spectral lines in emission (e.g. line no. 5 arises from the transition from level B to A). Which of the following spectral lines will occur in the absorption spectrum?
Which one of the following pairs is correctly matched?
Water is falling on the blades of a turbine at a rate of $6000 \,kg \,min ^{-1}$. The height of fall is $100\, m$. The power given to the turbine is
The homologous organs are those that show similarity in
Which has most stable +2 oxidation state?
The neurogenic heart is the characteristic feature of
There is an electric field E in x-direction. If the work done on moving a charge of 0.2 C through a distance of 2 m along a line making an angle 60$^{\circ}$ with x-axis is 4 J, then what is the value of E?
A charge q is placed at the centre of the line joining two exactly equal positive charges The system of three charges will be in equilibrium, if q is equal to
The internal energy of one mole of ideal gas is
In Leucosolenia, food is stored in
Which of the following complex has square planar structure?
Which of the following does not belong to first transition series ?
The function $f(x) = max \{(1 - x), (1 + x), 2\}, x \in (- \infty, \infty)$ is
In the circuit shown in the figure, the current through
Maximum covalency of an element of atomic number $7$ is
Quality factor of LCR circuit having resistance R and inductance L at resonance frequency $ (\omega ) $ is given by:
A battery of internal resistance $4\Omega$ is connected to the network of resistances as shown in figure. In order that the maximum power can be delivered to the network, the value of R in $2\Omega$ should be