List of practice Questions

Find the effective impedance in the circuit if the source is: a) DC source and b) High frequency AC source

effective impedance in the circuit if the source

Linear magnification produced by a mirror is +1.5. What is the correct mirror and object position?

Match List I with List II

List I	List II
(A) Modulation	(III) Superimposition of a signal on a high frequency wave
(B) Baseband signals	(IV) Band of frequencies representing the original signal
(C) Demodulation	(I) Retrieval of information from the carrier wave at the receiver
(D) Bandwidth	(II) Frequency range over which an equipment operates

The graph shows the variation of the magnification (m) produced by a thin lens with image distance (v). The focal length of the lens is:

variation of the magnification

Match List I with List II using Bohr’s Atomic Model

List I	List II
(A) Radius of electron orbit	(I) directly proportional to n²
(B) Angular momentum of electron	(II) directly proportional to n
(C) Velocity of electron	(III) inversely proportional to n
(D) Energy of electron	(IV) inversely proportional to n²

Which of the following is connected to the coil of the galvanometer, to protect it from possible damages due to large current?

Match List I with List II

	LIST I		LIST II
A.	Quality factor of a circuit	I.	\([R^2 +(X_L - X_C)^2]^{\frac{1}{2}}\)
B.	Impedance in an ac circuit	II.	\((\sqrt{LC})^{-1}\)
C.	Resonant frequency of a LCR circuit	III.	\(0.5i_mV_m sin (2ωt)\)
D.	Instantaneous power supplied to a capacitor	IV.	\((ω_0CR)^{-1}\)

Choose the correct answer from the options given below:

A flask contains Argon and Chlorine in the ratio of 2:1 by mass. The temperature of the mixture is 27°C. The ratio of root mean square speed of molecules of two gases will be: (atomic mass of Argon =40 u and molecular mass of Chlorine = 71 u)

Two polaroids P₁ and P₂ are set in crossed positions. A third polaroid P₃ is placed between the two making an angle a with the axis passing from the first polaroid P₁, In what orientation will the transmitted intensity be maximum?

An infinite line charge produces an electric field of 9 × 10⁶ N/C at a distance of 20 cm. The linear charge density will be :

The susceptibility ($X_m$) and permeability (μ) of a perfectly diamagnetic substance are:

Ferro-magnetic materials used in transformer core must have:

For a long wire carrying a current of 10 A, the magnitude of magnetic field at a point 4 cm away from it will be:

A coil having 'n' turns and resistance 'R'Ω is connected with a galvanometer of resistance '4R' Ω. What is the induced current in the circuit when this combination (coil+galvanometer) is moved in time t from a magnetic flux Φ1 to Φ2?

An emf of 0.5 V is developed in the secondary coil, when current in primary coil changes from 5.0 A to 2.0 A in 300 milliseconds. The mutual inductance of two coils would be:

Match List I with List II

	LIST I		LIST II
A.	Infra red waves	I.	Eye surgery
B.	Microwaves	II.	1 nm to 10-3 nm
C.	Ultraviolet	III.	Heat waves
D.	X-rays	IV.	Produced by special vaccum tubes

Choose the correct answer from the options given below:

Which of the following is/are responsible for the formation of Rainbow?
(A) Dispersion of light
(B) Interference of light
(C) Reflection of light
(D) Refraction of light
Choose the correct answer from the options given below:

The shape of graph between 1/u and 1/v in case of a convex lens is:

At what speed should a galaxy move with respect to earth so that spectral line of 600.0 nm appears as 600.6 nm?

Choose the correct statements:
(A) A nuclide is represented as \(^Z_AX\)
(B) Nuclids with same number of protons are called isotopes
(C) a-ray scattering experiments allow determination of the nuclear radius
(D) Nuclids with same number of neutrons are called isotones
(E) The nuclear force distinguishes between neutron and proton
Choose the correct answer from the options given below:

A cell of constant emf is first connected to a resistance \(R_1\) and then to \(R_2\). If power delivered in both cases are same, then the internal resistance of the cell is:

To protect galvanometer from possible damages due to large current, which of the following should be connected to its coil:

In AC circuits, the relation that holds is \( Z = \frac{E_U}{I_U} \), where:

Match List I with List II

List I: Frequency Range	List II: Types of Waves
(I) 1 × 10¹⁶ − 3 × 10²¹ Hz	(D) γ-rays
(II) 1 × 10⁹ − 3 × 10¹¹ Hz	(B) Microwaves
(III) 1 × 10⁸ − 5 × 10²² Hz	(A) X-rays
(IV) 5 × 10⁵ − 10⁹ Hz	(C) Radio waves

An electromagnetic wave going through vacuum is described by \( E = E_0 \sin(kx - \omega t) \), \( B = B_0 \sin(kx - \omega t) \), then: