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NEET Practice Test - 23 - NEET MCQ


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30 Questions MCQ Test - NEET Practice Test - 23

NEET Practice Test - 23 for NEET 2024 is part of NEET preparation. The NEET Practice Test - 23 questions and answers have been prepared according to the NEET exam syllabus.The NEET Practice Test - 23 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for NEET Practice Test - 23 below.
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NEET Practice Test - 23 - Question 1

Dimensions of electrical resistance are

Detailed Solution for NEET Practice Test - 23 - Question 1

We know that
Ohm’s law, V = IR
[where V is Voltage, R is Resistance and I is current]
∴ 

NEET Practice Test - 23 - Question 2

An electron of a stationary hydrogen atom passes from the fifth energy level to the ground level. The velocity that the atom acquired as a result of photon emission will be

Detailed Solution for NEET Practice Test - 23 - Question 2

For emission, the wave number of the radiation is given as

R = Rydberg constant, z = atomic number


linear momentum

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NEET Practice Test - 23 - Question 3

A boat takes 2 h to travel 8 km and back in still water, the velocity of water 4 km/h, the time taken for goir up stream 8 km and coming track is

Detailed Solution for NEET Practice Test - 23 - Question 3

Boats covers distance of 16 km in a still water in 2 h
i.e VB = 16/2 = 8km/h
Given, velocity of water Vw = 4 km/h.
So, time taken for upstream

Therefore, time taken for downstream 


NEET Practice Test - 23 - Question 4

A body of mass 2 kg is rotating on a circular path of radius 0.8 m with an angular velocity 44 rac sec. If radius of path becomes 1 m then value t angular velocity will be

Detailed Solution for NEET Practice Test - 23 - Question 4

We shall apply conservation of angular momentum; that is
I1ω1 = I2ω2
⇒ mv1r1 = mv2r⇒  ω1r12 = ω2r22
⇒ 44 x (0.8)2 =  ω x (1)2
⇒ ω2 = 44 x 0.8 x 0.8 = 28.16 radius/sec

NEET Practice Test - 23 - Question 5

The string of a pendulum is horizontal. The mass of bob attached to it is m. Now, the string is released. The tension in the string in the lowest position is​

Detailed Solution for NEET Practice Test - 23 - Question 5

According to conservation of Energy
KE = PE
1/2mv=mg
So,    V2 = 2gh
V2 = 2gR       (∵ h = R)
Now, while it is at the bottom


 T = mg + 2mg = 3mg

NEET Practice Test - 23 - Question 6

An observer moves towards a stationary source of sound with a speed l/5th of the speed of sound. The wavelength and frequency of the source emitted by any source be λ, and  f respectively. The apparent frequency and wavelength recorded by the observer are respectively -

Detailed Solution for NEET Practice Test - 23 - Question 6


wavelength remains constant (unchanged) in this case.

NEET Practice Test - 23 - Question 7

 Two similar springs P and Q have spring constants Kp and Kq , such that Kp > KQ. They are stretched, first by the same amount (case a), then by the same force (case b). The work done by the springs Wp and WQ are related as, in case (a) and case (b), respectively

Detailed Solution for NEET Practice Test - 23 - Question 7

In case (a)


So, W> WQ
Now In case (B)

So, W< WQ

NEET Practice Test - 23 - Question 8

A heater of 220 V heats a volume of water in 5 minutes. A heater of 110 V heats the same volume of water in

Detailed Solution for NEET Practice Test - 23 - Question 8

Heat produced, H = V2t/R. When voltage is halved, the heat produced becomes one fourth. Hence time taken to heat the water becomes four time.

NEET Practice Test - 23 - Question 9

In an orbital motion, the angular momentum vector is

Detailed Solution for NEET Practice Test - 23 - Question 9

We know that P is linear momentum of a particle and r is position vector from the point of rotation.
Now, angular momentum isL = r * p = rp sin θ  when is unit vector in direction of rotation.
So, angular momentum is perpendicular to orbital plane,

NEET Practice Test - 23 - Question 10

The perfect gas equation for 4 gram of hydrogen gas is

Detailed Solution for NEET Practice Test - 23 - Question 10

n = 4/2 = 2   ∴ Pv = 2RT

NEET Practice Test - 23 - Question 11

A circular road of radius 1000 m has banking angle 45°. The maximum safe speed of a car having mass 200 kg will be, if the coefficient of friction between tyre and road is 0.5

Detailed Solution for NEET Practice Test - 23 - Question 11

Velocity of banked road with fraction

NEET Practice Test - 23 - Question 12

According to Einstein’s photoelectric equation, the plot of the kinetic energy of the emittec photoelectrons from a metal vs the frequency of the incident radiation gives a straight line whose slope

Detailed Solution for NEET Practice Test - 23 - Question 12


This is equation of a straight line, if we plot v , K -E curve. The slope of this curve is 1/h which is constant. So, it is independent of metal used.

NEET Practice Test - 23 - Question 13

A black body calorimeter filled with hot water cools from 60°C to 50°C in 4 min and 40°C to 30°C in 8 min. The approximate temperature of surrounding is

Detailed Solution for NEET Practice Test - 23 - Question 13

Given, θl =60
θ2 = 50 [where θ is the temperature of surroundings] t =4

Case I
Now,

Case II ⇒ Given
θ1 = 40
θ2 = 40
t= 8
then,

Now on solving these equations, then we get
θ0= 15°C

NEET Practice Test - 23 - Question 14

In a nuclear fission, 0.1% mass is converted into energy. The energy released by the fission of 1 kg mass will be ​

Detailed Solution for NEET Practice Test - 23 - Question 14

 0 .1 % of 1 kg = 0.001 kg
From the formula, E = mc2
Energy released
= 0.001 x (3 x 108 )2 joules
= 9 x 1016x 10-3 = 9 x 1013

NEET Practice Test - 23 - Question 15

The electric current in a circuit is given by I =  3t  
Here, t is in second, I is in ampere. The rms current for the period t = 0 to t = 1 s is

Detailed Solution for NEET Practice Test - 23 - Question 15

Given,
I = 3t
so,
I2 = 9t2
then,

∴ Irms = √3 A

NEET Practice Test - 23 - Question 16

A projectile is thrown in the upward direction making an angle of 60° with the horizontal direction, with a velocity of 147 ms-1. Then the time after which inclination with the horizontal is 45°, is

Detailed Solution for NEET Practice Test - 23 - Question 16

At the two points of the trajectory during projectile motion, the horizontal component of the velocity is same. Then u cos 60° = v cos 45°
⇒ 
Initially,

Finally,

But, 

NEET Practice Test - 23 - Question 17

Pressure versus temperature graph of an ideal gas is as shown in figure. Corresponding density (p versus volume (V) graph will be

Detailed Solution for NEET Practice Test - 23 - Question 17

The equation of state for an adiabatic process is
PVT = constant
PVr-1 = constant
Trp1-r = constant 
So, the graph will be

NEET Practice Test - 23 - Question 18

A tin nucleus (atomic number Z = 50) has a radius of 6.6 x 10-15 m. The potential on its surface will be (the charge on the proton = 1.6 x 10-19 C) ​

Detailed Solution for NEET Practice Test - 23 - Question 18

Charge on the tin nucleus - n.Q
= (1.6 x 10-19 x 50) C = 8 x 10-18C
This charge is supposed to be concentrated at its centre. Hence, potential on the surface,

NEET Practice Test - 23 - Question 19

Velocity of sound in the atmosphere of a planet is 500 ms-1. The minium distance between the source of sound and the obstacle to hear the echo should be

Detailed Solution for NEET Practice Test - 23 - Question 19

Total distance travelled by the Sound in going and coming back should not be more than 50 m because time taken by the reflected wave to return to the source should not be more than 0.15.

NEET Practice Test - 23 - Question 20

Two rods of the same length and areas of cross section  A and A2 have their ends at the same temperature K1 and K2 are the thermal conductivities of the two rods. The rate of flow of heat is same in both rods if

Detailed Solution for NEET Practice Test - 23 - Question 20
Explanation:

In order for the rate of flow of heat to be the same in both rods, the following conditions need to be satisfied:



  • A1 = A2: The areas of cross-section of the two rods must be equal.

  • K1 ≠ K2: The thermal conductivities of the two rods can be different.


Based on the given options:



  • Option A: This option does not satisfy the condition A1 = A2.

  • Option B: This option satisfies the conditions A1 = A2 and K1 ≠ K2, so it is a possible answer.

  • Option C: This option states that A1A2 = K1K2, which is not a correct condition for the rate of flow of heat to be the same in both rods.

  • Option D: This option states that A1K12 = A2K22, which is not a correct condition for the rate of flow of heat to be the same in both rods.


Therefore, the correct answer is Option B.

NEET Practice Test - 23 - Question 21

The electric charge on drop B is 1.6 x l0-19C and its mass is 1.6 x 10-14 kg. If the drop is in equilibrium, then the potential difference between the plates will be (where, density d = 10 x 10-3 kgm-3)

Detailed Solution for NEET Practice Test - 23 - Question 21

∵ E = V/d
mg = qE
So,
V = mgd/q

v =10V

NEET Practice Test - 23 - Question 22

A cylindrical resonance tube, open at both ends has a fundamental frequency f in air, If half of the length is dipped vertically in water, the fundamental frequency of the air column will be

Detailed Solution for NEET Practice Test - 23 - Question 22


From the figure it is clear that in both the cases wavelength is same. So, frequency of fundamental tone will also be same. Hence the answer will be (c).

NEET Practice Test - 23 - Question 23

Twenty identical bulbs are connected in series across a 220 V supply. Two of the bulbs are found to bum out. The remaining 18 bulbs are connected again in series across the same supply. The illumination will be

Detailed Solution for NEET Practice Test - 23 - Question 23

Two of the bulbs are bum out and the 18 bulbs are remaining and all the bulbs are connected to Series the effective resistance are reduced its result higher current flow through the combinations. So illumination will be more than with 18 bulbs and with 20 bulbs

NEET Practice Test - 23 - Question 24

The kinetic energy of a body becomes four times its inital value. The new momentum will be​

Detailed Solution for NEET Practice Test - 23 - Question 24


as K is made four times P will become two times.

NEET Practice Test - 23 - Question 25

The coefficients of self-induction of two coils are L1 ant L2. To induce an emf of 25 V in the coils change of current of 1A has to be produced in 5s and 50 ms respectively. The ratio of their self-inductances L1: L2 will be

Detailed Solution for NEET Practice Test - 23 - Question 25

From the formula of self inductance

so, L ∝ dt
∴ 

NEET Practice Test - 23 - Question 26

The voltage time (V-t) graph for triangular wave having peak value V0 is as shown in figure. The rms value of V in time interval from t = 0 to T/4 is  then find the value of x.

Detailed Solution for NEET Practice Test - 23 - Question 26


NEET Practice Test - 23 - Question 27

The speed of electromagnetic waves in a vacuum, is given by

Detailed Solution for NEET Practice Test - 23 - Question 27

By moxwell’s theory predicted that Em waves of all frequencies propagate in vacuum with a speed is given by 

NEET Practice Test - 23 - Question 28

A 2 kg copper block is heated to 500°C and then it is placed on a large block of ice at 0°C. If the specific heat capacity of copper is 400 J/kg°C and latent heat of fusion of water is 3.5 x 105 J/kg, the amount of ice that can melt is

Detailed Solution for NEET Practice Test - 23 - Question 28

Let x kg of ice can melt
Using law of Calorimetry
Heat lost by copper = Heat gained by ice
2 * 400 * (500 - 0) = x * 3.5 * 105
or
 

NEET Practice Test - 23 - Question 29

Two coherent monochromatic light beams of intensities I and 4I are superposed. The maximum and minimum possible intensities in the resulting beam are

Detailed Solution for NEET Practice Test - 23 - Question 29

NEET Practice Test - 23 - Question 30

A current of I ampere flows in a wire forming a circular are of radius r meters subtending an angle θ at the cintre as shown. The magnetic field at the centre O in tesla is

Detailed Solution for NEET Practice Test - 23 - Question 30

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