List of top Physics Questions

Which of the following statements are correct?
A. Photoelectric current depends on the intensity of light.
B. The stopping potential is directly related to the maximum kinetic energy of electrons emitted, which is dependent on the intensity of incident radiation.
C. Photoelectric emission from a metal surface occurs due to absorption of a photon by an electron.
D. Photoelectric effect follows the law of conservation of energy.

Select the correct statement for nuclear force:

Match List I with List II

List I	List II
(A) Rn22286 → Po21884	(III) α particle
(B) Bi21483 → Po21484	(I) β− particle
(C) Th23490 → U23492	(I) β− particle
(D) Na2211 → Na2210	(II) β+ particle

What will be the energy released in the fusion process of two lighter nuclei of masses \( m_1 \) and \( m_2 \) into a nucleus of mass \( M \)?

Which of the following statements is NOT correct:

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

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

The correct curve between stopping potential \( V_0 \) and intensity of incident radiation \( I \) at constant frequency is:

The type of wavefront that emerges from a distant light source is:

A proton, a deuteron, an electron, and an \(\alpha\)-particle have the same energy. Their deBroglie wavelengths are \( \lambda_p \), \( \lambda_d \), \( \lambda_e \), and \( \lambda_{\alpha} \), respectively. Which of the following is correct?

A spherical air lens of radii \( R_1 = R_2 = 10 \, \text{cm} \) is cut from a glass (\(\mu = 1.5\)) cylinder as shown in the figure. Its focal length is \( f_1 \). If a liquid of refractive index \( \mu_2 \) is filled in the space, then the focal length of the liquid lens becomes \( f_2 \). Calculate \( f_1 \) and \( f_2 \). Choose the correct options from the following.

In Young's double slit experiment, yellow light of wavelength 640 nm produces fringes of width 0.8 mm. What will be the fringe width if the light source is replaced by another monochromatic source of wavelength 720 nm and the separation between the slits is made thrice?

Light is traveling from one medium to another medium as given in the options. In which of the following options total internal reflection will be possible?

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 astronomical telescope consists of an objective of focal length 50 cm and eyepiece of focal length 2 cm is focused on the moon so that the final image is formed at the least distance of distinct vision (25 cm). Assuming angular diameter of the moon as \( \frac{1}{2^\circ} \) at the objective, the angular size of image is:

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

When 100 V dc is applied across a solenoid, a current of 1 A flows in it. When 100 V ac is applied across the same solenoid the current drops to 0.5 A. If the frequency of the ac source is 50 Hz, the impedance and inductance of the solenoid are:

In an a.c. circuit, the rms voltage is \(100\sqrt{2}\) V. The peak value of voltage would be:

Which one out of the following is not an application of eddy currents?

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

A square loop of copper wire is pulled through a region of uniform magnetic field as shown. Rank the pulling forces \(F_A\), \(F_B\), \(F_C\), and \(F_D\) that must be applied to keep the loop moving with constant speed (\(\vec{v}\)):

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

Magnetic field \(|B|\) at a point \(P\) in the following network is:

There is a thin conducting wire carrying current. The value of magnetic field induction at any point on the conductor would be:

The charge which is a source of electric field but not of magnetic field is: