# AIIMS MBBS 2018 Higher Questions and Answers with Solutions Part 3

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Q: 20. A magnetic material is placed in a non-uniform magnetic field which is oriented along z-axis having gradient, then force experienced by the material will be equal to

Solution:

Now

So

Q: 21. A Rocket having initial mass . Which include mass of fuel of mass is ejecting gas with velocity relative to Rocket, then what will be the velocity of the Rocket when entire fuel finishes.

Solution:

Q: 22. In a single slit diffraction the distance between slit & screen is . The size of the slit is second maximum is formed at the distance of from the centre of the screen, then find out the wavelength of light.

Solution:

Title: Q-22-Image of find out the Wavelength of Light

Description: Q-22-Image of find out the Wavelength of Light

Path difference

Q: 23. In a solar cell current is generated due to bond breakage in which region.

(1) Depletion region

(2) n-region

(3) p-region

(4) None of these

Ans. (1)

Solution:

In solar cell bond breakage becomes at depletion region.

Q: 24. In a modulated signal the maximum amplitude is and minimum amplitude is , then amplitude of signal wave will be :

Solution:

Maximum amplitude

Minimum amplitude

So

Q: 25. In a series LR circuit and DC . Find current at seconds.

Solution:

Q: 26. If of water is vaporized (latent heat of vaporization) at . If the volume of steam formed is calculate increase internal energy.

Solution:

Q: 27. In the figure shown is the source of white light kept at a distance from the plane of the slits. The source moves with a constant speed u towards the slits on the line perpendicular to the plane of the slits and passing through the slit . Find the instantaneous velocity (magnitude and direction) of the central maxima at time t having range .

Title: Q-27-Image of the Source of White Light and Distance of Plane of Slits

Description: Q-27- Image of the Source of White Light and Distance of Plane of Slits

Solution:

Title: Q-27-1-Image of the Source of White Light and Distance of Plane of Slits

Description: Q-27-1- Image of the Source of White Light and Distance of Plane of Slits

and

(Downwards)

Q: 28. Light is incident on a polarizer with intensity. A second prism called analyzer is kept at an angle of 15º, from the first polarizer then the intensity of final emergent light will be:

Title: Q-28-Image of the Light is incident on a Polarizer with Intensity

Description: Q-28-Image of the Light is incident on a Polarizer with Intensity

Solution:

Q: 29. A satellite orbiting certain planet has apogee and perigee equal to, then find the minimum kinetic energy that should be given to the satellite to enable it to escape the planate.

Solution:

Title: Q-29- A satellite orbiting certain planet has apogee and perigee equal to

Description: Q-29- A satellite orbiting certain planet has apogee and perigee equal

to

should be given

Q: 30. Assertion: Rainy clouds appear dark from below.

Reason: There is not sufficient light which can be scattered by these clouds.

(1) If both assertion and reason are true and reason is the correct explanation of assertion.

(2) If both assertion and reason are true but reason is not the correct explanation of assertion.

(3) If assertion is true but reason is false.

(4) If both assertion and reason are false.

Ans. (1)

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