List of top Questions asked in CUET (UG)

A pure inductor of 0.25 H is connected to a source of 220 V. If the frequency of the source is 50 Hz, then the rms current in the circuit will be.
Identify the correct statement(s) among the following.
A. In a d.c. circuit, a capacitor can conduct but not an inductor.
B. In a d.c. circuit, an inductor can conduct but not a capacitor.
C. In a d.c. circuit, both the inductor and capacitor cannot conduct.
D. An inductor has infinite resistance in a d.c. circuit.

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A coil with an average diameter of 0.02 m is placed with its plane perpendicular to a magnetic field of 6000 T. The induced emf in the coil is 11 V, when the magnetic field is changed to 1000 T in 4 s. The number of turns in the coil is
Arrange the following electromagnetic waves in the ascending order of their energies.
A. X-rays
B. UV-rays
C. Infrared rays
D. Microwaves
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The conduction current is same as displacement current in a circuit when the source is
A 0.5 m long solenoid has 500 turns and has a flux density of \(2.52 \times 10^{-3}\) T at its center. The current in the solenoid is (Given, \(\mu_0 = 4\pi \times 10^{-7}\) H/m)
A bar magnet of dipole moment 3 Am2 rests with its centre on a frictionless point. A force F is applied at right angles to the axis of the magnet, 10 cm from the point. It is observed that an external magnetic field of 0.25 T is required to hold the magnet in equilibrium at an angle of \(30^{\circ}\) with the field. The value of F is:
The mutual inductance of a pair of coils placed close to each other depends upon
If the number of turns in a coil is tripled, the value of the magnetic flux linked with the coil:
Identify the correct statements among the following.
A. The torque acting on a planar current loop in a magnetic field changes when its shape is changed without changing its area.
B. Two parallel wires carrying currents in opposite directions attract each other.
C. An ideal ammeter has zero resistance and an ideal voltmeter has infinite resistance.
D. A galvanometer can be converted into a voltmeter by connecting a high resistance in series.

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A wire shown in figure carries a current of 10 A. The magnitude of the magnetic field at the centre O is: (Given: radius of the bent coil is 3 cm.)
Identify the correct statements among the following:
A. A current carrying wire is electrically charged.
B. The drift velocity of electrons in a metallic wire will decrease if the temperature of the wire is increased.
C. The emf of a cell depends on the internal resistance of the cell.
D. The internal resistance of dry cells is much higher than the common electrolytic cells.
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At what temperature the resistance of a conductor becomes 20% more than its resistance at \(27^\circ\) C? (The value of the temperature coefficient of resistance of the conductor is \(2.0 \times 10^{-4}\)/K.)
In a Wheatstone bridge arrangement (P, Q, R and S), the resistors P and Q are nearly equal. The bridge is balanced when R = 500 \(\Omega\). On interchanging P and Q, the value of R for balancing is 505 \(\Omega\). The value of S will be:
If a ferromagnetic material is inserted in a current carrying solenoid, the magnetic field inside the solenoid
An electron of charge 'e' moves in a circular orbit of radius r around a nucleus with a frequency \(\nu\). The magnetic moment associated with the orbital motion of the electron is
A positive charge enters a magnetic field and travels parallel to the magnetic field. The charge experiences
Match the LIST-I with LIST-II
LIST-I (Quantity)LIST-II (Formula)
A. Electromotive forceI. Drift velocity / Electric field
B. Electric fieldII. Current / Area
C. Current densityIII. Electric force / Charge
D. Charge mobilityIV. Work / Charge
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Arrange the following materials in the ascending order of their electrical conductivities.
A. Rubber
B. Iron
C. Carbon
D. Copper
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A charge q is placed at the center of a line joining two equal positive charges Q. The system of the three charges will be in equilibrium, if q is equal to
A metal wire is bent in the shape of a circle of 10 cm radius. It is given a charge of 200 \(\mu\)C which spreads on it uniformly. The electric potential at its center is
Three capacitors of equal capacitance, when connected in series have net capacitance \(C_1\) and when connected in parallel have net capacitance \(C_2\). The ratio of \(C_1\) and \(C_2\) is
A 800 pF capacitor is charged by a 100 V battery. After some time, the battery is disconnected. The capacitor is then connected across another 800 pF capacitor. The electrostatic energy stored in the combination will be
Identify the correct statements from the following :
A. The charge on a body can have any value greater than the charge on an electron or proton.
B. Gauss's theorem is valid for a closed surface of any shape and for any general charge distribution.
C. The net flux through a closed surface due to a charge lying outside the closed surface is zero.
D. Gauss's theorem is applicable to any field which obeys the inverse square law
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An electric dipole is placed in an external uniform electric field. The net electric force on the dipole