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NEET Practice Test - 24 - NEET MCQ


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30 Questions MCQ Test - NEET Practice Test - 24

NEET Practice Test - 24 for NEET 2024 is part of NEET preparation. The NEET Practice Test - 24 questions and answers have been prepared according to the NEET exam syllabus.The NEET Practice Test - 24 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for NEET Practice Test - 24 below.
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NEET Practice Test - 24 - Question 1

Dimensional formula for surface tension is

Detailed Solution for NEET Practice Test - 24 - Question 1

From the formula of surface tension
T = F/L [dimensional formulae of F is MLT-2 and Lis L]
So, 

NEET Practice Test - 24 - Question 2

When a mass is rotating in a plane about a fixed point, its angular momentum is directed along the

Detailed Solution for NEET Practice Test - 24 - Question 2

As angular momentum,  therefore, direction of  is along a line perpendicular to the plane of rotation.

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NEET Practice Test - 24 - Question 3

A 120 m long train is moving in a direction with speed 20 m/s. A train B moving with 30 m/s in the opposite direction and 130 m long, crosses the first train in a time.

Detailed Solution for NEET Practice Test - 24 - Question 3

According to the questions,
Total distance =13 +120 = 150 m
Relative velocity = 30 - (-20)
= 50 m/s
So, t = 250/50 = 5s

NEET Practice Test - 24 - Question 4

If μr, μk and μs represent the coefficients of rolling friction, kinetic and static friction, then

NEET Practice Test - 24 - Question 5

A heavy stone hanging from a massless string of lengt 15m, is projected horizontally with speed 147ms-1. Th speed of the particle at the point where the tension i the string equals the weight of the particle, is

Detailed Solution for NEET Practice Test - 24 - Question 5


v= gl(1 - cosθ) ............... (1)
Now, from law of conservation of energy

......... (2)
Now, on solving eqs (i) and (ii), we get

from eqs (ii), we get

NEET Practice Test - 24 - Question 6

Kirchhoff’s I and II laws are based on conservation of

Detailed Solution for NEET Practice Test - 24 - Question 6

Kirchhoff's 1st law states that the algebraic sum of currents (charges) meeting at the junction is zero or ∑i or ∑q = 0, hence, it is based on the conservation of charge. Kirchoff's Ilnd law states that algebraic sum of the products of resistance and respective current in a closed mesh is zero. ∑iR = ∑E, hence, it is based on the conservation of energy.

NEET Practice Test - 24 - Question 7

A balloon with mass m is descending with an acceleration a (where, a < g) . How much mass could be removed from it, so that its starts moving up with an acceleration a?

Detailed Solution for NEET Practice Test - 24 - Question 7

For downward, the equation is
Mg - B = ma ............ (i)
for upward, the equation is
B - (m - mo)g = (m - mo)a ......... (ii)
Now, on adding eq (i) and (ii) then we get
mg - mg + mog = ma + ma - moa

NEET Practice Test - 24 - Question 8

​The work function of a metallic substance is 5 eV. The threshold frequency is approximately

Detailed Solution for NEET Practice Test - 24 - Question 8

Work function (W0) and the threshold frequency (v0) are related as below
W0 = hvo

= 1.2 x 1015Hz

NEET Practice Test - 24 - Question 9

Initial angular velocity of a circular disc of mass M is ω1.Then, two small spheres of m are attached gently two diametrically opposite points on the edge of the disc. What is the final angular velocity of the disc?

Detailed Solution for NEET Practice Test - 24 - Question 9

From the formula of conservation of angular momentum

NEET Practice Test - 24 - Question 10

What is the ratio of the shortest wavelength of the Balmer series to the shortest wavelength of the Lyman series?

Detailed Solution for NEET Practice Test - 24 - Question 10

For Lyman series

For shortest wavelength, n = ∞,

For Balmer series

For shortest wavelength, n = ∞,

The ratio

 

NEET Practice Test - 24 - Question 11

Three blocks of masses 4 kg, 2 kg, 1 kg respectively are in contact on a frictionless table as shown in the figure. If a force of 14 N is applied on the 4 kg block, the contact force between the 4 kg and the 2 kg block will be

Detailed Solution for NEET Practice Test - 24 - Question 11

∴ F = ma
⇒ 14 = 7 a
⇒ 2 = a
a = 2m/s2
Now,    14 = N + Ma
N = 14 - 4 x 2
= 6 N

NEET Practice Test - 24 - Question 12

Use of eddy currents is done in the following except

Detailed Solution for NEET Practice Test - 24 - Question 12

Eddy current is the current produced in the body of a conductor due to electromagnetic induction. Moving coil galvanometer, electric brakes and induction motor based on electromagnetic induction. Hence they, use eddy current. Dynamo doesn’t use it.

NEET Practice Test - 24 - Question 13

If a body coated black at 600 K surrounded by atmosphere at 300 K has cooling rate r0, the same body at 900 K, surrounded by the same atmosphere, will have cooling rate equal to

Detailed Solution for NEET Practice Test - 24 - Question 13

∵ cooling rate ∝ T4 - T04

NEET Practice Test - 24 - Question 14

Consider the following statements and select the incorrect statement.

Detailed Solution for NEET Practice Test - 24 - Question 14

When charged particle enters perpendicularly in a magnetic field, it moves in a circular path with a constant speed. Hence its kinetic energy also remains constant.

NEET Practice Test - 24 - Question 15

What is the value of inductance L for which the current is maximum in a series L-C-R circuit with C = 10μF and ω = 1000s-1?

Detailed Solution for NEET Practice Test - 24 - Question 15

We known that
if XL - Xc
then 
or
 
(Given W = 1000S-1,.C = 10μF = 10 x 10-6f )
= 0.1H = 100MH

NEET Practice Test - 24 - Question 16

At the centre of a cubical box +Q charge is placed. The value of total flux that is coming out a wail is

Detailed Solution for NEET Practice Test - 24 - Question 16

According to Gauss’ Law

so total flux = Q/εo
Since cube has six face, so flux coming out through one wall or one face is Q/6εo

NEET Practice Test - 24 - Question 17

A body when fully immersed in a liquid of specific gravity 1.2 weight 44 gwt. The same body when fully immersed in water weight 50 gwt. The mass of the body is

Detailed Solution for NEET Practice Test - 24 - Question 17

Given,
Specific gravity = 1.2
Weight = 44 g wt
When fully immersed in water, then weight is 50 g wt.
Now, W = mg - Vρg
so, 44 = m - 1.2 V ............ (i)
50 = m - V ............. (ii)
Now, on Solving eqs (i) and (ii), we get (iii)
m = 80 g

NEET Practice Test - 24 - Question 18

According to the kinetic theory of gases, the pressure exerted by a gas on the walls is measured as

NEET Practice Test - 24 - Question 19

A sound absorber attenuates the sound level by 20 dB. The intensity decreases by a factor of 

Detailed Solution for NEET Practice Test - 24 - Question 19

Let intensity of Sound be l and I'.
∴ Loudness of Sound initially

and loudness of Sound later

But 


 

NEET Practice Test - 24 - Question 20

The fundamental frequency of a closed end organ pipe is n. Its length is doubled and radius is halved. Its frequency will become nearly

Detailed Solution for NEET Practice Test - 24 - Question 20

Frequency does not depend upon radius.
As length is doubled, fundamental frequency becomes half.

NEET Practice Test - 24 - Question 21

In a vande Graaff generator, the voltage of a metallic spherical shell is 15 x 105 V and electric field around the electrode is 15 x 107 Vm-1, then the minimum radius of the metallic spherical shell is

Detailed Solution for NEET Practice Test - 24 - Question 21

Using the formula

∴ V/E = r
∴ 
 = 1 cm

NEET Practice Test - 24 - Question 22

A particle moves such that its acceleration ‘ a ’ is given by a = - bx where x is the displacement from equilibrium position and b is constant. The period of oscillation is

Detailed Solution for NEET Practice Test - 24 - Question 22

NEET Practice Test - 24 - Question 23

A 120 W, 60 V bulb is to be operated on a 120 V DC supply. For this a resistor of resistance R is connected in series with the bulb. The value of R is

Detailed Solution for NEET Practice Test - 24 - Question 23

Using the formula of resistance

Now current through the bulb is

So,
 

NEET Practice Test - 24 - Question 24

The magnetic field of earth at the equator is approximately 4 x 10-5 T . The radius of earth is 6.4 x 106 m. Then the dipole moment of the earth will be nearly of the order of:

Detailed Solution for NEET Practice Test - 24 - Question 24

Given, B = 4 x 10-5 T
r = 6.4 x 10m
Dipole moment of the earth M = ?


∴ M ≌ 1023 Am2

NEET Practice Test - 24 - Question 25

Two coils of self-inductance 2 mH and 8 mH are placed so close together that the effective flux in one coil is completely linked with the other. The mutual inductance between these coils is

Detailed Solution for NEET Practice Test - 24 - Question 25

Given, L1 =2mH
L2 = 8mH
We know that

NEET Practice Test - 24 - Question 26

A passenger travels along the straight road for half the distance with velocity v1 and the remaining half distance with velocity v2. Then average velocity is given by

Detailed Solution for NEET Practice Test - 24 - Question 26

NEET Practice Test - 24 - Question 27

Maxwell’s modified form of Ampere’s circuital law is

Detailed Solution for NEET Practice Test - 24 - Question 27

At an instant, in a circuit, the conduction current is equal to displacement current.
So we calculate mathematically, we get

This equation is known as maxwell's equation. 

NEET Practice Test - 24 - Question 28

A solid cylinder of mass m & radius R rolls down inclined plane without slipping. The speed of its C.M. When it reaches the bottom is

Detailed Solution for NEET Practice Test - 24 - Question 28

By energy conservation
(K.E)i + (P .E)i = (K.E)f + (P.E)f (K.E)i = 0,(P.E)i = mgh,(P.E)f = 0
(K.E)f = 1/2Iw2 + 1/2mv2cm
Where I (moment of inertia) =1/2mR2
(for solid cylinder)
so mgh = 1/2(1/2mR2)
 + 1/2mv2cm
vcm

NEET Practice Test - 24 - Question 29

In Young’s double slit experiment, the intensity at a point where the path difference is λ/6 (λ being the wavelength of light used) is I. If Io denotes the maximum intensity  is equal to

Detailed Solution for NEET Practice Test - 24 - Question 29

Using the formula

and 

 

NEET Practice Test - 24 - Question 30

Steam is passed into 22 gm of water at 20°C. The mass of water that will be present when the water acquires a temperatue of 90°C (Latent heat of steam is 540 cal/g) is

Detailed Solution for NEET Practice Test - 24 - Question 30

Let m be the mass of steam condensed.
Then m x 540 + m x 10/2 = 22 x 70
∴  m=2.83gm
Now, total mass =22 + 2.83 = 24.83 gm

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