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WBJEE 2019 Physics Revision Quiz 1

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Question 1

In a RLC circuit, at what frequency the phasor is aligned with the direction of Resistance. Given R=10ohms, L=0.2H and C=180μF.

Question 2

A current I flows through a uniform wire of diameter d when the mean electron drift velocity is V. The same current will flow through a wire of diameter d/2 made of the same material if the mean drift velocity of the electron is

Question 3

A copper rod AB of length L, pivoted at one end A, rotates at constant angular velocity ω, at right angles to a uniform magnetic field of induction B. The e.m.f developed between the mid point C of the rod and end B is

Question 4

The circuit resembles which of the following gates for A=0and B=1,

Question 5

A capacitor of capacitance C is charged to a potential difference V from a cell and then disconnected from it. A charge +Q is now given to its positive plate. The potential difference across the capacitor is now

Question 6

$Description: E:\KCET-1-Feb\Karnataka_CET2013_files\image116.png$
The figure shows the energy level of certain atom. When the electron deexcites from 3E to E, an electromagnetic wave of wavelength λ is emitted. What is the wavelength of the electromagnetic wave emittred when the electron de excites from $Description: E:\KCET-1-Feb\Karnataka_CET2013_files\image117.png$ to E?

Question 7

With a standard rectangular bar magnet the time period of a vibration magnetometer is 4 s. The bar magnet is cut parallel to its length into four equal pieces. The time period of vibration magnetometer when one piece is used (in second)(bar magnet breadth is small) is

Question 8

An ideal gas undergoes a circular cycle centered at 4 atm, 4 lit as shown in the diagram. The maximum temperature attained in this process is close to

Question 9

One end of a 2.35m long and 2.0cm radius aluminium rod (K = 235 W.m–1K^-1) is held at 20°C. The other end of the rod is in contact with a block of ice at its melting point. The rate in kg. s^-1 at which ice melts is

Question 10

Pressure versus temperature graph of an ideal gas is shown in figure.

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May 15JEE & BITSAT