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NEET Practice Test - 25 - NEET MCQ


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30 Questions MCQ Test - NEET Practice Test - 25

NEET Practice Test - 25 for NEET 2024 is part of NEET preparation. The NEET Practice Test - 25 questions and answers have been prepared according to the NEET exam syllabus.The NEET Practice Test - 25 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for NEET Practice Test - 25 below.
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NEET Practice Test - 25 - Question 1
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The quantity having the same units in all systems of units is

Detailed Solution for NEET Practice Test - 25 - Question 1

Time is the quantity having the same units in all system of units.

NEET Practice Test - 25 - Question 2
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A balloon contains 1500 m3 of helium at 27°C and 4 atmospheric pressure. The volume of helium at -3°C temperature and 2 atmospheric pressure will be, 

Detailed Solution for NEET Practice Test - 25 - Question 2


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NEET Practice Test - 25 - Question 3
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A police jeep is chasing a culprit going on a motorbike. The motorbike crosses a turning at a speed of 72 km/h. The jeep follows it at a speed of 90 km/h, crossing the turning 10 s later than the bike. Assuming that they travel at constant speeds, how far from the turning will the jeep catch up with the bike? (in km)

Detailed Solution for NEET Practice Test - 25 - Question 3

Given, vp = 90 km/hr = 90 x 5/18 m/sec = 25 m/sec
vc =  72 km/hr =  m /sec = 20 m /sec
In 10 sec culprit reaches point B from A. Distance covered by culprit.
5 = vt =20 x 10=200m
At time t = 10 sec. The police jeep is 200 m behind the culprit. Relative velocity between jeep and culprit is 25 - 20 = 5 m /sec

[Relative velocity is considered] 
In 40 sec, the police jeep will move from A to a distance S.
where, S = vt = 25 x 40 = 1000 m 1 km away
The jeep will catch up with the bike 1 km for from the turning.

NEET Practice Test - 25 - Question 4
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What will b.e the force constant of the spring system shown in figure?
Detailed Solution for NEET Practice Test - 25 - Question 4

Two springs of force constants k1 and k1 are in parallel. Hence
k' = k1 + k1 = 2k1.
The third spring k2 is in series with spring of force constant R'.

NEET Practice Test - 25 - Question 5
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A stone is tied to a string of length l and is whirled in air vertical circle with the other end of the string as their centre. At a certain instant of time, the stone is at its lowest position and has a speed u.The magnitude of the change in velocity as it reaches a position where the string is horizontal (g being acceleration due to gravity) is
Detailed Solution for NEET Practice Test - 25 - Question 5

When stone is at its lowest position, stone has only kinetic energy, given by k = 1/2 mu2

At the horizontal position, it has energy

According to conservation of energy.

K = E
∴ 
⇒ 
⇒ u,2 = u2 - 2gl
⇒ 
So, the magnitude of change in velocity 


NEET Practice Test - 25 - Question 6
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If c, the velocity of light, g the acceleration due to gravity and P the atmospheric pressure, be the fundamental quantities in MKS system, then the dimensions of length will be same as that of 
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NEET Practice Test - 25 - Question 7
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A particle of mass m is driven by a machine that deliver a constant power k watts. If the particle starts from rest the force on the particle at time t is
Detailed Solution for NEET Practice Test - 25 - Question 7

Here,
Fv = constant = k
⇒ 
⇒ 
⇒ 
⇒ 

NEET Practice Test - 25 - Question 8
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A sonometer wire supports a 4 kg load and vibrates in fundamental mode with a tuning fork of frequency 416 Hz. The length of the wire between the bridges is now doubled. In order to maintain fundamental mode, the load should be changed to
Detailed Solution for NEET Practice Test - 25 - Question 8

Load supported by sonometer wire = 4 kg 
Tension in sonometer wire = 4 g 
If μ = mass per unit length
then frequency 

When length is doubled, i.e,, l' = 2l
Let new load = L 
As, v' = v

NEET Practice Test - 25 - Question 9
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A couple consisting of two forces F1 and F2 each equal to 5 N is acting at the rim of a disc of mass 2 kg and radius 1/2m for 5s. Initially, the disc is at rest, the final angular momentum of the disc is
Detailed Solution for NEET Practice Test - 25 - Question 9

Torque acting on disc is,

From angular impulse momentum theorem,

NEET Practice Test - 25 - Question 10
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A large tank filled with water to a height 'h’ is to be emptied through a small hole at the bottom. The ratio of time taken for the level of water to fall from h to h/2 and h/2 to zero is
Detailed Solution for NEET Practice Test - 25 - Question 10


∴ t1 = 
and t2 = 
∴ 

NEET Practice Test - 25 - Question 11
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A body of mass m hangs at one end of a string of length l, the other end of which is fixed. It is given a horizontal velocity, so that the string would just reach where it makes an angle of 60° with the vertical. The tension in the string at bottom most point position is
Detailed Solution for NEET Practice Test - 25 - Question 11

Velocity at mean position,

= mg + mg = 2mg

NEET Practice Test - 25 - Question 12
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What is the disintegration constant of radon, if the number of its atoms diminishes by 18% in 24 h?
Detailed Solution for NEET Practice Test - 25 - Question 12

For nuclear disintegration

NEET Practice Test - 25 - Question 13
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A black body at 1227°C emits radiations with maximum intensity at a wavelength of 5000Å. If the temperature of the body is increased by 1000° C, the maximum intensity will be observed at
Detailed Solution for NEET Practice Test - 25 - Question 13

According to wien’x law, T = constant
∴ 
Given, T = 1227 + 273 =1500 K.
T' = 1227 + 1000 + 273 = 2500 K. 
λm = 5000 Å
Hence, 

NEET Practice Test - 25 - Question 14
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Consider the following statement:
When jumping from some height, you should bend your knees as you come to rest, instead of keeping your legs stiff. Which of the following relations can be useful in explaining the statement?
Where symbols have their usual meanings.
Detailed Solution for NEET Practice Test - 25 - Question 14

If  force acts for short interval Δt, then 

NEET Practice Test - 25 - Question 15
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The bandwidth of a series resonant circuit is 500 Hz and the resonant frequency is 5000 Hz. The quality factor of the circuit will be
NEET Practice Test - 25 - Question 16
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The mass number of He is 4 and that for sulphur is 32. The radius of sulphur nuclei is larger than that of helium by
Detailed Solution for NEET Practice Test - 25 - Question 16

NEET Practice Test - 25 - Question 17
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How much should the pressure of the gas be increased to decrease the volume by 10% at a constant temperature?
Detailed Solution for NEET Practice Test - 25 - Question 17

At constant temperature, PV = constant
As valume decreased by 10%, so pressure has to increase to keep the product of PV constant.
Therefore, volume becomes 9/10V
Pressure = 10/9 V
% increase = 

NEET Practice Test - 25 - Question 18
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A hollow cylinder has a charge q coulomb within it. If φ is the electric flux in units of voltmeter associated with the curved surface B, the flux linked with the plane surface A in units of voltmeter will be
Detailed Solution for NEET Practice Test - 25 - Question 18

Since φtotal = φA + φB + φC = q/ε0,
where q is the total charge.
As shown in the figure, flux associated with the curved surface B is φ = φB
Let us assume flux linked with the plane surfaces A and C be
φA  = φC =  φ'
Therefore,

NEET Practice Test - 25 - Question 19
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The equation y =  represents a wave with
Detailed Solution for NEET Practice Test - 25 - Question 19



 ...(i)
Now, general wave equation is 
y = A cos (ωt - kx)
= A cos(2πvt - (2π/λ)x) ...(ii)
On comparing Eqs. (i) and (ii), we get 
Amplitude - A/2, frequency v =2n 
and wavelength = λ/2

NEET Practice Test - 25 - Question 20
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If the critical angle for total internal reflection from a medium to vacuum is 30°. Then velocity of light in the medium is
Detailed Solution for NEET Practice Test - 25 - Question 20


Velocity of light in the medium.
 = 1.5 x 108 m/sec

NEET Practice Test - 25 - Question 21
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Which of the following is not the property of equipotential surfaces?
Detailed Solution for NEET Practice Test - 25 - Question 21

They can be imaginary spheres.

NEET Practice Test - 25 - Question 22
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The rain drops are in spherical shape due to
Detailed Solution for NEET Practice Test - 25 - Question 22

Rain drops are in spherical shape due to surface tension.

NEET Practice Test - 25 - Question 23
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A parallel plate capacitor is connected to a battery. The plates are pulled apart with a uniform speed. If x is the separation between the plates, the time rate of change of electro static energy of capacitor is proportional to
Detailed Solution for NEET Practice Test - 25 - Question 23

Energy of a parallel plate capacitor is given by

Given that, d = x
Therefore, we have U = 
⇒ 
⇒ 
Potential energy decreases as = 
⇒ 

NEET Practice Test - 25 - Question 24
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A particle of mass 1 kg is moving in S.H.M. with an amplitude 0.02 and a frequency of 60 Hz. The maximum force acting on the particle is
Detailed Solution for NEET Practice Test - 25 - Question 24

Max. force = mass x max. acceleration 
= m 4 π2 v2 a = 1 x 4 x π2 x (60)2 x 0.02 
= 288π2

NEET Practice Test - 25 - Question 25
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 A long horizontal rod has a bead which can slide along its length and initially placed at a distance L from one end A of the rod. The rod is set in angular motion about A with constant angular acceleration α. If the coefficient of friction between the rod and the bead is μ and gravity is neglected, then the time after which the bead starts slipping is
Detailed Solution for NEET Practice Test - 25 - Question 25

Bead starts moving when the centripetal force is equal to the friction.
Hence, friction F = μmat [here gravity is neglected] 
where, at is tangential acceleration, it will be given by
at = v/t, where v is the linear speed = Lω. 
Hence, 
Also, centripetal farce = mLω2 
Hence 
i.e., 
This gives 

NEET Practice Test - 25 - Question 26
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According to Maxwell’s hypothesis, a changing electric field gives rise to
Detailed Solution for NEET Practice Test - 25 - Question 26

Changing electric field gives rise to displacement current which creates magnetic field around it.

NEET Practice Test - 25 - Question 27
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Which of the following pairs of space and time varying  E = (iEx + jEY + kEz) and B = (iBx + jBy + kBz) would generate a plane electromagnetic wave travelling in the z-direction?
Detailed Solution for NEET Practice Test - 25 - Question 27

Direction of propagation of EM waves is in the direction of cross product of E and B [i. e. E x B]
So, if wave is propagating in two direction, then 
E = Exi and B = Byj
Then, E x B point in +z direction.

NEET Practice Test - 25 - Question 28
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A bucket full of hot water is kept in a room and it cools from 75°C to 70°C in T1 minutes, from 70°C to 65°C in T2 minutes and from 65°C to 60°C in T3 minutes. Then
Detailed Solution for NEET Practice Test - 25 - Question 28

The time of cooling increases as the difference between the temperature of body 6 surrounding is reduced. So T1<T2<T3 (according to Newton’s law of cooling).

NEET Practice Test - 25 - Question 29
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In Young’s double slit experiment, when wavelength used is 6000 Å and the screen is 40 cm from the slits, the fringes are 0.012 cm wide. What is the distance between the slits?
Detailed Solution for NEET Practice Test - 25 - Question 29


⇒ 

NEET Practice Test - 25 - Question 30
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The energy of hydrogen atom in the nth orbit is En, then the energy in the nth orbit of single ionised helium atom is
Detailed Solution for NEET Practice Test - 25 - Question 30

For nth orbit, energy, 
For hydrogen (z = 1), 
For helium (z = 2),
So, 

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