List of practice Questions

For the circuit shown in the figure

In which region of the interphase chromosome does transcription take place ?

A charged particle (charge $q$ ) is moving in a circle of radius $R$ with uniform speed $v$. The associated magnetic moment $\mu$ is given by

A radioactive nucleus is being produced at a constant rate $\alpha$ per second. Its decay constant is $\lambda$. If $N_0$ are the number of nuclei at time t = 0, then the maximum number of nuclei possible are

The number of moles of $ KMnO_{4}$ reduced by one mole of $KI$ in alkaline medium is

A ray of light is incident on a plane mirror at an angle of $60^\circ$. The angle of deviation produced by the mirror is

Palisade parenchyma is absent in leaves of

Tapetum is found in

An LCR series circuit, connected to a source $E$, is at resonance. Then

A galvanometer having a coil resistance of $ 60O $ shows full scale deflection when a current of 1.0 A passes through it. It can be converted unto an ammeter to read currents upto 5.0 A by

A steady current of $1.5\, A$ flows through a copper voltameter for 10 min. If the electrochemical equivalent of copper is $30 \times 10^{-5}\, g\, C ^{-1}$, the mass of copper deposited on the electrode will be

A galvanometer coil has a resistance of $10 \, \Omega $ and the ammeter shows full scale deflection for a current of $1\,mA$. The shunt resistance required to convert the galvanometer into an ammeter of range $0-100\,mA$ is about

Three electric bulbs of $200\, W, 200 \,W$ and $400\, W$ are shown in figure. The resultant power of the combination is

A long straight wire of a circular cross-section (radius $ a $ ) carries a steady current $ I $ and the current $ I $ is uniformly distributed across this cross-section. Which of the following plots represents the variation of magnitude of magnetic field $B$ with distance $r$ from the centre of the wire?

In a potentiometer of one- metre length, an unknown emf voltage source is balanced at $60 \,cm$ length of potentiometer wire, while a $3 \,V$ battery is balanced at $45 \,cm$ length. Then the emf of the unknown voltage source is

A galvanometer of resistance $10\, \Omega$ gives full-scale deflection when $1\, mA$ current passes through it. The resistance required to convert it into a voltmeter reading upto $2.5\, V$ is

If on applying the potential of 20 V on a conductor its conductance becomes $ 8\,{{(\Omega )}^{-1}}, $ then the current flowing through it will be

A conducting rod of length $l$ and mass $m$ is moving down a smooth inclined plane of inclination $\theta$ with constant velocity $v$. A current $i$ is flowing in the conductor in a direction perpendicular to paper inwards. A vertically upwards magnetic field $\vec{ B }$ exists in space. Then magnitude of magnetic field $\vec{ B }$ is

The value of current J in the circuit will be

The resistance of mercury at $4.2 \, K$ is