List of top Physics Questions

A charge of 5 μC moves with a speed of $2 \times 10^6$ m/s along the positive y-axis. A magnetic field $\vec{B}$ of strength ($2\hat{i}+ \hat{k}$)T exists in space. The magnetic force acting on the charge is :

The circuits where transformers are used:

Match List I with List II

	LIST I		LIST II
A.	Magnetic dipole moment	I.	Weber/$m^2$
B.	Magnetic permeability	II.	Am (Ampere m)
C.	Pole strength	III.	Henry/m
D.	Magnetic flux density	IV.	$Am^2$ (Ampere $m^2$)

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An isolated sphere has a capacitance of 60 pF, what is the radius of the sphere?

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

What is the magnetic force acting on a proton (charge +1.6 × 10^-19C) moving at an angle of 30° across a magnetic field of 5.3 x 10³ T at a speed of 3.0 x 10⁵ ms^-1?

Two sitar stings A and B playing a note are slightly out of tune and produces beats of frequency 5 Hz. The tension in string B is slightly increased and beat frequency become 3 Hz. What is the original frequency of B if frequency of A is 427 Hz.

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:

For a medium with permittivity (e) and permeability (µ), the speed of light (v) is given by:

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

A bar magnet when suspended horizontally and perpendicular to earth's field experiences a torque of 3 x 10^-4 Nm. The Magnetic moment of the magnet would be:
(take horizontal component of Earth's magnetic field at the place 0.4 × 10^-4T)

At a place, the horizontal component of earth's magnetic field is $4 \times 10^{-4}T$ and angle of dip is 60°. The value of horizontal component of earth's magnetic field at the equator is :

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

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Following are the wavelength of some constituents of the electromagnetic spectrum. The wavelength range that are used in Radar system for Aircraft navigation is:
(A) 1 mm to 700 nm
(B) 0.1 m to 1 mm
(C) 400 nm to 1 nm
(D) < 10-3 nm
(E) > 1m
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The susceptibility ($X_m$) and permeability (μ) of a perfectly diamagnetic substance are:

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

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

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

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

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 :