List of top Physics Questions

Two charges 5 µC and -2 µC (with no external field) are placed at (-9 cm, 0, 0) and (9 cm, 0, 0) respectively. The work required to separate the two charges infinitely away from each other is :

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

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The logic gate realised using p-n junction diodes in the given figure is:

Match List I with List II

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

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

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

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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?

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

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:

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

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

The energy diagram of a hydrogen atom is given below. Arrange the wavelengths corresponding to different emissions in increasing order.

The displacement current due to time varying electric field is given by

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:

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

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?

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:

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

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
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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)

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

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
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