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# JEE Main Physics Mock - 8

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## 25 Questions MCQ Test JEE Main & Advanced Mock Test Series | JEE Main Physics Mock - 8

JEE Main Physics Mock - 8 for JEE 2022 is part of JEE Main & Advanced Mock Test Series preparation. The JEE Main Physics Mock - 8 questions and answers have been prepared according to the JEE exam syllabus.The JEE Main Physics Mock - 8 MCQs are made for JEE 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for JEE Main Physics Mock - 8 below.
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JEE Main Physics Mock - 8 - Question 1

### Quantity that remains unchanged in a transformer is

JEE Main Physics Mock - 8 - Question 2

### The working of dynamo is based on principle of

Detailed Solution for JEE Main Physics Mock - 8 - Question 2 The dynamo operates on the principle of the production of dynamically induced emf. Hence when ever flux is cut by the conductor, emf is poduced in it according to the law of electromagnetic induction.
JEE Main Physics Mock - 8 - Question 3

### A constant force acts on a body of mass 0.9 kg at rest for 10 s. If the body moves a distance of 250 m, the magnitude of the force is

Detailed Solution for JEE Main Physics Mock - 8 - Question 3
Here d= 250m
t= 10 seconds
initial velocity(u)= 0
using equation d= ut +1/2 at2, we will get
250 = 50 xa
a=5m/s2
force= mass x acceleration = 0.9ks x 5m/s2 = 4.5 newton
JEE Main Physics Mock - 8 - Question 4

Two bodies of mass 10 kg and 5 kg moving in concentric orbits of radii R and r such that their periods are the same. Then the ratio between their centripetal acceleration is

Detailed Solution for JEE Main Physics Mock - 8 - Question 4

JEE Main Physics Mock - 8 - Question 5
The directions of electric and magnetic fields in J.J. Thomson's experiment for the determination of e/m for an electron are
Detailed Solution for JEE Main Physics Mock - 8 - Question 5 The specific charge of an electron can be determined when electron moves in both magnetic field and electric field which are mutually perpendicular to each other so that the net force on the electron is made zero. IN this situation the direction of motion of electron remains perpendicular to both electric and magnetic field.
JEE Main Physics Mock - 8 - Question 6

An electric dipole is placed along the X-axis at the origin O. A point P is at a distance of 20 cm from this origin such that OP makes an angle π/3 with the X axis. If electric field at P makes an angle θ with X-axis, the value of θ is

Detailed Solution for JEE Main Physics Mock - 8 - Question 6
JEE Main Physics Mock - 8 - Question 7
A glof ball of mass 0.05 kg placed on a tee, is struck by a golf club. The speed of the golf ball as it leaves the tee is 100 m/s, the time of contact between them is 0.02 s. If the force decreases to zero linearly with time, then the force at the beginning of the contact is
JEE Main Physics Mock - 8 - Question 8

A semi circle arc of radius 'a' is charged uniformly and the charge per unit length is λ. The electric field at its centre is

JEE Main Physics Mock - 8 - Question 9

The figure shows the symbol of a

JEE Main Physics Mock - 8 - Question 10
A liquid flows through a pipe of non-uniform cross-section. If A₁ and A₂ are the cross-sectional areas of the pipe at two points, the ratio of velocities of the liquid at these points will be
JEE Main Physics Mock - 8 - Question 11
A particle is moving in a uniform magnetic field then
JEE Main Physics Mock - 8 - Question 12

Which of the following equations is definitely wrong?

JEE Main Physics Mock - 8 - Question 13
In neutron discovery experiment, Berillium element is bombarded by
JEE Main Physics Mock - 8 - Question 14
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): A particle move from A (X1,Y1,Z1) to B (X2,Y2,Z2), displacement is given as (X2-X1)i, (Y2-Y1)j, (Z2-Z1)k.
Reason (R):Displacement can be positive, negative or zero.
JEE Main Physics Mock - 8 - Question 15
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): The density of air at the top of the troposphere is about 10 times the density near the earth's surface.
Reason(R): The atmosphere between the heights of 12 km and 50 km is called troposphere.
JEE Main Physics Mock - 8 - Question 16

For a gas, if the ratio of specific heats at constant pressure and volume is γ, then the value of degree of freedom is

Detailed Solution for JEE Main Physics Mock - 8 - Question 16

Cp=(f/2+1)RT
Cv= (f/2)RT
Taking ratio we get
Cp/Cv = y = (f/2 + 1)/(f/2)
y=(f + 2)/f
y=1 + 2/f
y -1=2/f
f = 2/(y-1)
Hope it helps

JEE Main Physics Mock - 8 - Question 17

A 2 kg mass is rotating on a circular path of radius 0.8 m with angular velocity of 44 rad-s-1. If radius of the path becomes 1 m, then value of angular velocity will be

Detailed Solution for JEE Main Physics Mock - 8 - Question 17
JEE Main Physics Mock - 8 - Question 18

Which is not a unit of electric field

JEE Main Physics Mock - 8 - Question 19
Ultrasonic waves are those waves
JEE Main Physics Mock - 8 - Question 20

In a mixture of H−He+ gas (He+ is singly ionized He atom) , H atoms and He+ ions are excited to their respective first excited states. Subesquently, H atoms transfer their total excitation energy to He+ ions (by collisions). Assume that the Bohr model of atom is exactly vaild.

Q. The quantum number n of the state finally populated in He+ ions is

*Answer can only contain numeric values
JEE Main Physics Mock - 8 - Question 21

A biconvex thin lens is prepared from glass of refractive index µ2 = 3/2. The two converging surface have equal radii of  20cm each. One of the surface is silvered from outside to make it reflecting. It is placed in a medium of refractive index µ1 = 5/3. This system will behave as concave mirror of focal length f, find value of |f| in cm.

Detailed Solution for JEE Main Physics Mock - 8 - Question 21

*Answer can only contain numeric values
JEE Main Physics Mock - 8 - Question 22

Find the maximum kinetic energy (in eV) of the photoelectron liberated from the surface of lithium (work function φ = 2.15eV) by electromagnetic radiation whose electric component varies with time as E = a (1 + cos ωt)cosω0t,
where a is a constant, ω = 12 × 1014 rads–1 and ω0 =  3.6 × 1015 rads–1 (h = 6.6 × 10–34 in SI units)

Detailed Solution for JEE Main Physics Mock - 8 - Question 22

*Answer can only contain numeric values
JEE Main Physics Mock - 8 - Question 23

A photosensitive surface is irradiated with light of wavelength λ, the stopping potential is V. When the same surface is irradiated with the light of wavelength 2λ, stopping potential is V/3. Then the ratio of threshold wavelength (λmax) and the λ is

Detailed Solution for JEE Main Physics Mock - 8 - Question 23

*Answer can only contain numeric values
JEE Main Physics Mock - 8 - Question 24

One of the circuits for the measurement of resistance by potentiometer is shown. The galvanometer is connected at point A and zero deflection is observed at length PJ = 30 cm. In second case the secondary cell is changed. Take ES = 10 V and r = 1Ω  in 1st reading and ES = 5V and r = 2Ω in 2nd reading. In second case, the zero deflection is observed at length PJ = 10 cm. What is the resistance R (in ohm)?

Detailed Solution for JEE Main Physics Mock - 8 - Question 24

*Answer can only contain numeric values
JEE Main Physics Mock - 8 - Question 25

A uniform triangular plate of triangular area 1m2, base length 60 cm and thickness 10 mm (prism like shape) is lying vertically on a smooth ground as shown in figure. Find maximum value of cotθ for which it does not topple.

Detailed Solution for JEE Main Physics Mock - 8 - Question 25

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## JEE Main & Advanced Mock Test Series

2 videos|324 docs|160 tests