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NEET Practice Test - 9 - NEET MCQ


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30 Questions MCQ Test NEET Mock Test Series 2025 - NEET Practice Test - 9

NEET Practice Test - 9 for NEET 2024 is part of NEET Mock Test Series 2025 preparation. The NEET Practice Test - 9 questions and answers have been prepared according to the NEET exam syllabus.The NEET Practice Test - 9 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for NEET Practice Test - 9 below.
Solutions of NEET Practice Test - 9 questions in English are available as part of our NEET Mock Test Series 2025 for NEET & NEET Practice Test - 9 solutions in Hindi for NEET Mock Test Series 2025 course. Download more important topics, notes, lectures and mock test series for NEET Exam by signing up for free. Attempt NEET Practice Test - 9 | 180 questions in 200 minutes | Mock test for NEET preparation | Free important questions MCQ to study NEET Mock Test Series 2025 for NEET Exam | Download free PDF with solutions
NEET Practice Test - 9 - Question 1
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If power dissipated in the 9 Ω resistor in the circuit shown is 36 W, the potential difference across the 2 Ω resistor is

Detailed Solution for NEET Practice Test - 9 - Question 1
We have,

Current passing through the 9 Ω resistor is

The 9 Ω and 6 Ω resistors are in parallel, therefore

where i is the current delivered by the battery.

Therefore,

Thus, the potential difference across the 2 Ω resistor is

V = iRV = iR = 5 × 2 = 5 × 2 = 10 V

NEET Practice Test - 9 - Question 2
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In a simple harmonic oscillator, at the mean position

Detailed Solution for NEET Practice Test - 9 - Question 2
In a simple harmonic oscillator, kinetic energy is maximum and potential energy is minimum at mean position.
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NEET Practice Test - 9 - Question 3
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Two white dots are 1 mm apart on a black paper. They are viewed by the pupil of the eye of diameter 3 mm3 mm. Approximately, what is the maximum distance at which these dots can be resolved by the eye? [Take wavelength of light = 500 nm]

Detailed Solution for NEET Practice Test - 9 - Question 3
Angle made by two points separated by distance y when viewed from large distance D

Resolving angular limit,

NEET Practice Test - 9 - Question 4
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The threshold energy for a metallic surface corresponds to an energy of 6.2 eV and the stopping potential for a radiation incident on this surface 5 V. The incident radiation lies in
Detailed Solution for NEET Practice Test - 9 - Question 4
For photo-electron emission,

(Incident energy E) = (K.E.)max + (Work function ϕ)

or E = Km + ϕ

or E = 5 + 6.2 = 11.2 eV

= 11.2 x (1.6 x 1019 ) J

The incident radiation lies in the ultraviolet region.

NEET Practice Test - 9 - Question 5
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A car moves at 80 km h-1 in the first half of total time of motion and at 40 km h−1 in the later half. Its average speed is
Detailed Solution for NEET Practice Test - 9 - Question 5

s1 = 40t and s2 = 20t

Total distance = s1 + s2 = 40t + 20t

Total distance = s1 + s2 = 40t + 20t

∴

∴

= 60 km h−1

NEET Practice Test - 9 - Question 6
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In a p-n-p transistor biased in the active region, in the base, holes
Detailed Solution for NEET Practice Test - 9 - Question 6
Majority carrier diffuse from emitter to base where they recombine with the opposite charge carrier
NEET Practice Test - 9 - Question 7
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A flask of mercury is sealed off at 20 °C and is completely filled with mercury. If the bulk modulus for mercury is 25000 MPa and the coefficient of volume expansion of mercury is 1.82 × 10−4 °C−1 and the expansion of glass is ignored, the pressure of mercury within the flask at 100 °C will be
Detailed Solution for NEET Practice Test - 9 - Question 7

= 1.46 × 10−2

Now the bulk modulus, where P is the pressure.

P = (25000) x 1.46 x 10-2 MPa = 365 MPa

NEET Practice Test - 9 - Question 8
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A common emitter amplifier has a voltage gain of 50, an input impedance of 100 Ω and an output impedance of 200 Ω. The power gain of the amplifier is
Detailed Solution for NEET Practice Test - 9 - Question 8

where AV is voltage gain AV is voltage gain and (β)AC is AC current gain.

Also,

Given, AV = 50, Ro = 200 Ω, Ri = 100 Ω

∴ βAC = 25

Now, AC power gain = AV × βAC = 50 × 25 = 1250

NEET Practice Test - 9 - Question 9
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A long metallic bar is carrying heat from one of its ends to the other end under steady-state. The variation of temperature θ along the length x of the bar from its hot end is best described by which of the following figure?
Detailed Solution for NEET Practice Test - 9 - Question 9
We know that

In steady-state flow of heat

Equation θ = θH − k′x represents a straight line.

NEET Practice Test - 9 - Question 10
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A body of mass m is resting on a wedge of angle θ as shown in figure. The wedge is given an acceleration a. What is the value of a such that the mass m just falls freely?
Detailed Solution for NEET Practice Test - 9 - Question 10
The horizontal acceleration aa of the wedge should be such that in time the wedge moves the horizontal distance BC. The body must fall through a vertical distance AB under gravity. Hence,

NEET Practice Test - 9 - Question 11
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The magnetic dipole moment of a current loop is independent of
Detailed Solution for NEET Practice Test - 9 - Question 11
Magnetic dipole moment of a current is given by

M = N I A

where N = N = number of turns

I = current in a loop

A = area of the loop

From the above relation, it is clear that magnetic dipole moment of a current loop is independent of the magnetic field in which it is lying.

NEET Practice Test - 9 - Question 12
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Two springs of spring constants 1500 N m-1 and 3000 N m-1 respectively are stretched with the same force. They will have potential energy into ratio
Detailed Solution for NEET Practice Test - 9 - Question 12
The work done in pulling the string is stored as potential energy in the spring

Where k is spring constant and x is distance through which it is pulled.

Also in SHM

Force ∝ displacement

F = kx .......(ii)

Putting x = F/k in Eq. (i), we get

NEET Practice Test - 9 - Question 13
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A current of 10 A in the primary coil of a circuit is reduced to zero. If the coefficient of mutual inductance is 3 H and emf induced in the secondary coil is 30 kV, time taken for the change of current is
Detailed Solution for NEET Practice Test - 9 - Question 13

NEET Practice Test - 9 - Question 14
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A thief stole a box full of valuable articles of weight w and while carrying it on his head jumped down from a wall of height h from the ground. Before he reaches the ground, he experienced a load
Detailed Solution for NEET Practice Test - 9 - Question 14
When the thief with box on his head jumped down from a wall, he along with box is falling down with acceleration due to gravity, so the apparent weight of box becomes zero, (because, R = mg - mg = 0), so he experiences no load till he reaches the ground
NEET Practice Test - 9 - Question 15
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A body floats in a liquid contained in a beaker. If the whole system falls under gravity, then the upthrust on the body due to liquid is
Detailed Solution for NEET Practice Test - 9 - Question 15
Upthrust is independent of all factors of the body such as its mass, size, density etc, except the volume of the body inside the fluid. Fraction of volume immersed in the liquid Vin = (ρ/σ) V ie, it depends upon the densities of the block and liquid. So, there will be no change in it if system moves upward or downward with constant velocity or some acceleration. Therefore, the upthrust on the body due to liquid is equal tto the weight of the body in air.
NEET Practice Test - 9 - Question 16
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The 9th division of vernier scale coincides with 6th division of main scale in a vernier calliper. If one main scale division is 0.01 mm, then the least count of instrument is
Detailed Solution for NEET Practice Test - 9 - Question 16
9 VSD = 6 MSD

and L.C. = 1 MSD - 1 VSD

= 0.01/3 mm = 0.0033 mm

NEET Practice Test - 9 - Question 17
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In covering a certain distance, the time decreases by 20%, if speed (uniform) increases by 20 m/s. Find the original speed.
Detailed Solution for NEET Practice Test - 9 - Question 17
s = u × f …...(i)

……(ii)

⇒ 4u + 80 = 5u

⇒ u = 80 m/s

NEET Practice Test - 9 - Question 18
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The relation between acceleration and velocity for a body moving in straight line is a ∝ v3. Choose correct option, (x is position and t is time)
Detailed Solution for NEET Practice Test - 9 - Question 18

NEET Practice Test - 9 - Question 19
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A particle moves in x-y plane according to the law The equation of trajectory is
Detailed Solution for NEET Practice Test - 9 - Question 19

NEET Practice Test - 9 - Question 20
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A block of mass m is constrained to move inside a ring of radius R which is fixed on a horizontal smooth table. At time t = 0, block is moving along the inside of the ring (i.e., in the tangential direction) with velocity v0. The coefficient of friction between the block and the ring is μ. Then the speed of the block at time t is
Detailed Solution for NEET Practice Test - 9 - Question 20

NEET Practice Test - 9 - Question 21
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A body of radius R and radius of gyration K (about axis of rotation) is rolling without slipping. The fraction of its kinetic energy is in form of rotational kinetic energy is
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NEET Practice Test - 9 - Question 22
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If linear density of a rod of length 4 m varies as λ = 4 + x, then the position of the centre of gravity of the rod is
Detailed Solution for NEET Practice Test - 9 - Question 22

NEET Practice Test - 9 - Question 23
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A and B are two loops made from same wire. The radii of A and B are r1, and r2 and their moment of inertia about same axes are I1 and l2.

If I1/I2 = 1/4 then the value of r2/r1 is
Detailed Solution for NEET Practice Test - 9 - Question 23
I = mr2, m = d × AL, L = 2πr

∴ m = d × A × 2 πr ⇒ m ∝ r

NEET Practice Test - 9 - Question 24
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A wheel having moment of inertia 3 kg-m2 about its vertical axis, rotates at the rate of 30 rpm about this axis. The torque which can stop the wheel’s rotation in one minute would be
Detailed Solution for NEET Practice Test - 9 - Question 24

NEET Practice Test - 9 - Question 25
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The velocity of four gas molecules are given by 1 km/s, 2 km/s, 6 km/s and 8 km/s respectively. The rms velocity is
Detailed Solution for NEET Practice Test - 9 - Question 25

NEET Practice Test - 9 - Question 26
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The ratio of the density and pressure of a fixed mass of an ideal gas is “5” at 10°C. Then this ratio at 110°C is
Detailed Solution for NEET Practice Test - 9 - Question 26

NEET Practice Test - 9 - Question 27
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A particle of mass 0.2 kg executes SHM under a force of F = - 20x N. If speed of particle at mean position is 12 m/s then the amplitude of oscillations is
Detailed Solution for NEET Practice Test - 9 - Question 27
From conservation of mechanical energy,

NEET Practice Test - 9 - Question 28
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If two SHMs are represented by equations

then the ratio of their amplitudes is
Detailed Solution for NEET Practice Test - 9 - Question 28

The above equation becomes

NEET Practice Test - 9 - Question 29
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Moment of inertia of a ring about its diameteric axis is I. Two such rings are welded as shown in figure. The new moment of inertia about XX’ axis is
Detailed Solution for NEET Practice Test - 9 - Question 29

NEET Practice Test - 9 - Question 30
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A string is hanging from a rigid support. A transverse pulse is excited at its free end. The speed at which the pulse travels a distance x is proportional to
Detailed Solution for NEET Practice Test - 9 - Question 30

Pulse at distance x from free end

Mass per unit length = M/L

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