List of practice Questions

A coin is tossed twice. If the second throw result in a tail, a die is thrown. Then, the total number of the outcomes of this experiment is
A coil of wire of certain radius has 600 turns and a self inductance of 108 mH. The self inductance of a second similar coil of 500 turns will be
A coil of mean area $500\, cm^{2}$ and having $1000$ turns is held perpendicular to a uniform field of $0.4$ gauss The coil is turned through $180^{\circ}$ in $\frac{1}{10}$ second. The average induced emf is
A coil of wire having finite inductance and resistance has a conducting ring placed coaxially within it. The coil is connected a battery at time t = 0 , so that a time dependent current $I_1(t)$ starts flowing through the coil. If $I_2(t)$ is the current induced in the ring and B (t) is the magnetic field at the axis of the coil dut to $I_1(t)$ then as a function of time (t > 0), the product $I_2(t) \,B(t)$
A coil of 1200 turns and mean area of $500\,cm^2$ is held perpendicular to a uniform magnetic field of induction $4\times 10^{-4}T$.The resistance of the coil is 20 ohms. When the coil is rotated through 180$^\circ$ in the magnetic field in 0.1 seconds the average electric current (in mA) induced is :
A coil of area 100 cm having 500 turns carries a current of 1 m A . It is suspended in a uniform magnetic field of induction 10wb/m . Its plane makes an angle of $60^{\circ}$ with the lines of induction. The torque acting on the coil is
A coil of inductance 0.1H is connected to 50V, 100Hz generator and current is found to be 0.5A. The potential difference across resistance of the coil is
A coil has an inductance of 0.7 H and is joined in series with a resistance of $220\, \Omega$. When an alternative emf of 220 V at 50 cps is applied to it, then the wattless component of the current in the circuit is
A coil having a resistance of 20 ohm and inductance 20 henry is connected to 120 V battery. Find the value of energy stored in the magnetic field when the steady state is reached
A coil having n turns and resistance R is connected with a galvanometer of resistance 4R. This combination is moved in time t seconds from a magnetic field $W_1$ weber to $W_2$ weber. The induced current in the circuit is
A coil has 1,000 turns and $500 \,cm^2$ as its area, The plane of the coil is placed at right angles a magnetic induction field of $2 \times 10^{-5}\,web/m^2$ The coil is rotated through 180$^\circ$ in 0:2 seconds. The average emf induced in the coil, in milli volts, is:
Control of gene expression takes place at the level of
Inducible operon shows
The distance between two ribosomes of a polyribosome is
A closest distance of approach of an $\propto$ particle traveling with a velocity v towards $Al_{13}$ nucleus is d. The closest distance of approach of an alpha particle traveling with velocity 4V towards $Fr_{26}$ nucleus is
RNA enzyme, ribonuclease-P helps in separating from primary transcript
RNA polymerase III transcribes
A closed organ pipe of length 1.2 m vibrates in its first overtone mode. The pressure variation is maximum at
A closed organ pipe and an open pipe of the same length produce 4 beats when they are set into vibrations simultaneously. If he length of each of them were twice their initial lengths, the number of beats produced will be
In case of external fertilization, the number of off-spring produced is
$Begonia$ leaves develop buds
Leaf cuttings are used in propagation of
A clock with an iron pendulum keeps correct time at $15^{\circ} C$. If the room temperature rises to $20^{\circ} C$ , the error in seconds per day will be (coefficient of linear expansion for iron is $0.000012/^{\circ} C$ )
Blastos is
In $Pencillium$, the spores called conida, develop