JEE Main Physics Test- 9 - JEE MCQ

# JEE Main Physics Test- 9 - JEE MCQ

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## 25 Questions MCQ Test Mock Tests for JEE Main and Advanced 2025 - JEE Main Physics Test- 9

JEE Main Physics Test- 9 for JEE 2024 is part of Mock Tests for JEE Main and Advanced 2025 preparation. The JEE Main Physics Test- 9 questions and answers have been prepared according to the JEE exam syllabus.The JEE Main Physics Test- 9 MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for JEE Main Physics Test- 9 below.
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JEE Main Physics Test- 9 - Question 1

### A red LED emits light at 0.1 watt uniformly around it. The amplitude of the electric field of the light at a distance of 1 m from the diode is

JEE Main Physics Test- 9 - Question 2

### The resolution limit of the eye is 1 minute. At a distance of X km from the eye, two persons stand with a lateral separation of 3 meters. For the two persons to be just resolved by the naked eye, X should be

JEE Main Physics Test- 9 - Question 3

### In Young's double slit experiment, the fringe width is found to be 0.4 mm. If the whole apparatus is immersed in water of refractive index 4/3 without disturbing the geometrical arrangement, the new fringe width will be

JEE Main Physics Test- 9 - Question 4
For a prism of refractive index the angle of the prism is equal to the angle of minimum deviation.The value of
JEE Main Physics Test- 9 - Question 5
Two optical media of refractive indices n1 and n2 contain x and y waves of the same colour in the same thickness. Then their relative refractive index is equal to
JEE Main Physics Test- 9 - Question 6
The focal length of a convex lens is 10 cm and its is 1.5. If the radius of  curvature of one surface is 7.5 cm,the radius of curvature of the second surface will be
JEE Main Physics Test- 9 - Question 7
The refractive index of violet and red light are 1.54 and1.52 respectively. If the angle of prism is the angular dispersion is
JEE Main Physics Test- 9 - Question 8
Interference fringes are obtained using two coherent sources whose intensities are in ratio 4 : 1. Then the ratio of the intensities of the bright and dark bands is
JEE Main Physics Test- 9 - Question 9
A ray of light passes through an equilateral prism such that the angle of incidence is equal to the angle of emergence and the latter equal to (3/4)th the angle of
the prism. The angle of deviation will be
JEE Main Physics Test- 9 - Question 10
A point object is placed at a distance of 10cm & its real image is formed at a distance of 20 cm from a concave mirror. If the object is moved by 0.1 cm towards the mirror, the image will shift by
JEE Main Physics Test- 9 - Question 11
Angle of a prism is A and its one surface is slivered.Light rays falling at an angle of incidence 2 A on first surface returns back, through, the same path after
suffering reflection at the second silvered surface.Refractive index of material is
JEE Main Physics Test- 9 - Question 12
Diamond shines due to its
JEE Main Physics Test- 9 - Question 13
When a beam of accelerated electrons hit a target a continuous X-ray spectrum is emitted from the target.Which one of these wavelengths is absent in the X-ray
spectrum if the X-rays tube is operated at 40,000V ?
JEE Main Physics Test- 9 - Question 14
The radio transmitter operates on a wavelength of 1500m at a power of 400 kilowatt. The energy of radiophoton in Joules is
JEE Main Physics Test- 9 - Question 15

What are the essential properties a medium must possess for the propagation of mechanical waves?

Detailed Solution for JEE Main Physics Test- 9 - Question 15

The friction force amongst the particles of the medium should be negligibly small so that they continue oscillating for a sufficiently long time and the wave travels a sufficiently long distance through the medium

JEE Main Physics Test- 9 - Question 16
The wavelength of the first line of Balmer series of hydrogen atom is l Å. The wavelength of this line of a double ionised lithium atom Z = 3) is
JEE Main Physics Test- 9 - Question 17
A freshly prepared radioactive source of half life 2 hrs emits radiations of intensity which is 64 times the permissible safe level. The minimum time after which it would be possible to work safely with this source is
JEE Main Physics Test- 9 - Question 18
A gamma ray photon creates an electron positron pair. If the rest mass energy of an electron is 0.5MeV and the total kinetic energy of the electron positron pair is 0.5 MeV, then the energy of the gamma ray photon must be
JEE Main Physics Test- 9 - Question 19
In the thermonuclear reaction the energy
released per nucleon of the reactants is
JEE Main Physics Test- 9 - Question 20

The relationship between α and β is given by

*Answer can only contain numeric values
JEE Main Physics Test- 9 - Question 21

A radiation energy 'E' falls normally on a perfectly reflecting surface. The momentum transferred to the surface is PE/C, then P is -

*Answer can only contain numeric values
JEE Main Physics Test- 9 - Question 22

Find the deviation of light ray (in degree)

Detailed Solution for JEE Main Physics Test- 9 - Question 22

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JEE Main Physics Test- 9 - Question 23

In the arrangement shown a point source of light S is placed 60 cm to the left of a convex lens of focal length 30 cm and 2 cm above the common principal axis of the convex lens and a convex mirror of focal length 10 cm. Consider optic centre of the lens to be the origin, the x-coordinate of the final image of the source S for the viewer left to the lens is equal to (– K) cm. Calculate the value of K.

Detailed Solution for JEE Main Physics Test- 9 - Question 23

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JEE Main Physics Test- 9 - Question 24

An isotropic point source of light is kept at distance of 60 cm from a screen, the intensity of light obtained on center is I1. Now a lens of focal length 20 cm is introduced at exactly midway between source and screen and intensity obtained is I2. Find I2/8I1.

Detailed Solution for JEE Main Physics Test- 9 - Question 24

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JEE Main Physics Test- 9 - Question 25

A wave of frequency 100 Hz travels along a string towards its fixed end. When this wave travels back, after reflection, a node is formed at a distance of 10 cm from the fixed end. The speed of the wave (incident and reflected) is :

Detailed Solution for JEE Main Physics Test- 9 - Question 25

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