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This mock test of JIPMER Physics Mock Test - 4 for NEET helps you for every NEET entrance exam.
This contains 60 Multiple Choice Questions for NEET JIPMER Physics Mock Test - 4 (mcq) to study with solutions a complete question bank.
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QUESTION: 1

The effective value of alternating current passing through 24 Ω resistor is 5 A. The maximum potential difference across the resistor is

Solution:

QUESTION: 2

K_{1} and K_{2v}are the maximum kinetic energies of the photoelectrons emitted when light of wavelengths λ_{1} and λ_{2} respectively are incident on a metallic surface. If λ_{1} = 3 λ_{2} , then

Solution:

QUESTION: 3

A ball of mass 0.25 kg attached to the end of a string of length 1.96 m is moving in a horizontal circle. The string will break if the tension is more than 25 N. What is the maximum speed with which the ball can be moved

Solution:
Given,Length of String, l = 1.96 mMass of Ball, m = 0.25 KgMaximum Tension of String, Tmax = 25 NLet the speed of the ball is v m/sIn the horizontal circular motion of the ball tension in the string is balanced by the centrifugal force (mv2/l) and hence the maximum tension in the string will be for the maximum speed of the ball (since m and l are fixed).Therefore,Tmax=mv^2/l=> v^2=Tmax * l/m = 25 x 1.96/0.25=> v = 5 x 1.4/0.5 = 14 m/sTherefore, maximum speed of the ball will be 14 m/s.

QUESTION: 4

The resonant frequency of a circuit is f. If the capacitance is made 4 times the initial value, then the resonant frequency will becomes

Solution:

f = 1/2π LC

∴ f' = 1/2π √ 4LC = f/2

QUESTION: 5

A capacitor of capacity C₁ is charged by connecting it across a battery of e.m.f. V₀. The battery is then removed and the capacitor is connected in parallel with an uncharged capacitor of capacity C₂. The potential difference across this combination is

Solution:

QUESTION: 6

The power dissipated across resistance *R* which is connected across a battery of potential *V* is *P*. If resistance is doubled, then the power becomes

Solution:

QUESTION: 7

An electric motor operates on a.d.c. source of e.m.f. V and internal resistance R. The power output of the source is maximum when the current drawn by the motor is

Solution:

QUESTION: 8

A long solenoid has 500 turns . When a current of 2 ampere is passed through it , the resulting magnetic flux linked with each turn of the solenoid is 4 x 10^{-3} Wb. The self-inductance of the solenoid is

Solution:

For a long solenoid,

B = μ_{0}ni = μ_{0} N/l i

Flux = μ_{0} N/l iA

given flux per turn = 4 x 10^{-3}, i = 2A

∴ Total flux = 4 x 10^{-3}

QUESTION: 9

Which of the following radiations has the least wavelength?

Solution:

QUESTION: 10

The ratio of charge to potential of a capacitor is known as its

Solution:

QUESTION: 11

Two electric charge 12 μC and −6 μC are places 20 cm apart in air. There will be a point P at which electric potential is zero on the line joining these two charges and outside, excluding the region between them. The distance of P from −6 μC charge is

Solution:
For electric potential to be 0 V=V' KQ/R =KQ'/R' 12Ã·(0.20+x)=6Ã·x x=0.20m

QUESTION: 12

A fireman of mass 60 kg slides down a pole. He is pressing the pole with a force of 600 N. The coefficient of friction between the hands and the pole is 0.5, with what acceleration will the fireman slide down (g=10m/s^{2})

Solution:

QUESTION: 13

Choose the correct statement from the following. The radius of the orbit of a geostationary satellite depends upon

Solution:

QUESTION: 14

Ratio of inertial mass to gravitational mass is

Solution:

QUESTION: 15

A black body is heated from 27^{o}C to 127^{o}C. The ratio of their energies of radiations emitted will be

Solution:

QUESTION: 16

In Young's doulbe-slit experiment, instead of light, a beam of electron is used. The slit width is d. When the velocity of electron is increased, then

Solution:

QUESTION: 17

The volume of a gas will be double of what it is at 0^{o}C (pressure remaining constant) at

Solution:
0Â°C = 273 K ; 273Â°C=546K Volume is directly proportional to Temperature so at 546K gas will double its volume.

QUESTION: 18

A diamagnetic material in a magnetic field moves

Solution:

QUESTION: 19

The monoenergetic beams of electrons moving along +y direction enters a region of uniform electric and magnetic fields. If the beam goes straight through, then these simultaneously fields B̅ and E̅ are directed respectively

Solution:

QUESTION: 20

The magnetic field of given length of wire for single turn coil at its centre is B, then its value for two turns coil for the same wire is

Solution:

QUESTION: 21

Two circular coils of equal radii 2√2 x 10^{-2} m and having number of turns 2 each are arranged in perpendicular plane such that their centres coincide. Find the (i) Magnetic field at the centre due to each coil (ii) Resultant magnetic field at centre. They are carrying currents of 20mA each

Solution:

QUESTION: 22

Using a bar magnet P, a vibration magnetometer has time period 2 seconds. When a bar Q (identical to P in mass and size) is placed on top of P, the time period is unchanged. Which of the following statements is true ?

Solution:

QUESTION: 23

If a diamagnetic substance is brought near the north or the south pole of a bar magnet, it is:

Solution:

QUESTION: 24

The shape of a liquid drop becomes spherical due to its

Solution:

QUESTION: 25

A wire of length L and cross-section A is made of material of Young's modulus Y. If it is stretched by an amount x, then work done is

Solution:

QUESTION: 26

A beaker containing a liquid of density (ρ) moves up with an acceleration (a). The pressure due to liquid at a depth (h) below the surface of the liquid is

Solution:

As the beaker is moving up with acceleration, so we have to consider pseudo force on the pressure element.

Or simply in P = hpg , (p = density of liquid)

g will change to its apparent value g' = (g+a)

So, pressure at depth h will be, P= h p (g+a)

QUESTION: 27

The position of a particle moving in the xy-plane at any time t is given by x = (3t^{2}-6t) metres, y = (t^{2}-2t) metres. Select the correct statement about the moving particle from the following

Solution:

QUESTION: 28

A cylinder of 500 g and radius 10 cm has moment of inertia (about its natural axis)

Solution:

QUESTION: 29

A man fires a bullet of mass 200 g at a speed of 5 m/s. The gun is of one kg mass. by what velocity the gun rebounds backwards

Solution:

QUESTION: 30

Mass - energy equation was proposed by

Solution:

QUESTION: 31

The rest energy involved in a mass of one atomic mass unit is ---- eV.

Solution:

QUESTION: 32

The length of simple pendulum executing SHM is increased by 21%. The percentage increase in the time period of the pendulum of increased length is

Solution:

QUESTION: 33

The length of a telescope is 36 cm. The focal lengths of its lenses can be

Solution:

QUESTION: 34

When a metallic surface is illuminated by a monochromatic light of wavelength λ, then the potential difference required to stop the ejection of electrons is 3V₀. When the same surface is illuminated by the light of wavelength 2λ, then the potential difference required to stop the ejection of electrons is V₀. Then for photoelectric effect, the threshold wavelength for the metal surface will be

Solution:

QUESTION: 35

The work function of oxide coated tungsten emitter will be

Solution:

QUESTION: 36

Critical angle for light going from medium (i) to (ii) is θ. The speed of light in medium (i) is ν. Then speed in medium (ii) is

Solution:

QUESTION: 37

Two projectiles are fired at different angles with the same magnitude of velocity, such that they have the same range. At what angles they might have been projected?

Solution:

For equal range, the particle should either be projected at an angle θ or (90 - θ)

QUESTION: 38

Green light of wavelength 5460 Å is incident on an air glass interface. If refractive index of glass is 1.5, then wavelength of light in glass would be

Solution:

QUESTION: 39

Light travels in two media *A* and *B* with speed 2 x 10^{8} ms^{-1} and 2.265 x 10^{8} ms^{-1 } respectively. The sine of critical angle *C*, between them is

Solution:

QUESTION: 40

Electromagnetic radiation of frequency n, wavelength λ, travelling with velocity ν in air, enters a glass slab of refractive index μ. The frequency, wavelength and velocity of light in the glass slab will be respectively

Solution:

Frequency does not change with medium but wavelength and velocity decrease with the increase in refractive index. Hence, the frequency, wavelength and velocity of light in the glass slab are Î·, Î»/Î¼, Î½/Î¼ respectively.

QUESTION: 41

The moment of inertia of a uniform ring of mass M and radius r about a tangent lying in its own plane is

Solution:

QUESTION: 42

A particle with restoring force proportional to displacement and resisting force proportional to velocity has natural angular frequency ω₀. It is subjected to a force Fsinωt. If the amplitude of the particle is maximum for ω=ω₁ and the energy of the particle is maximum for ω=ω₂, then

Solution:

QUESTION: 43

Which of the following statement is correct?

Solution:

QUESTION: 44

The maximum velocity of a particle executing simple harmonic is *V*. If the amplitude is doubled and the time period of oscillation decreased to 1/3 of its original value, the maximum velocity becomes

Solution:
Use equationv=(2Ï€Ã·t) Ã— (AÂ²-xÂ²)^0.5Here maximum velocity is at x=0So v is directly proportional to A/t So answer is 6V

QUESTION: 45

At 0K, intrinsic semiconductor behaves as

Solution:

QUESTION: 46

Two identical strings of the same material, same diameter and same length are in unison when stretched by the same tension. If the tension on one string is increased by 21%, the number of beats heard per second is 10. The frequency of note in Hertz when the strings are in unison is

Solution:

For transverse vibration in the string, frequency is given by n=1/2l x (T/m)^1/2(where T is tension, m is the mass per unit length)

Hence n1 = 1/2l x (T1/m)^1/2 ---(i) and

n2=1/2l x (T2/m)^1/2 ----(ii)

Number of beat n2 âˆ’ n1=10 -----(iii)

Given T2 = T1 + (21/100) x T1=1.21 T1 ---(iv)

Putting the value of T2 in Eq. (ii), we get n2=1/2l x [1.21 x T1/m]^1/2 = 1.1 x 1/2l x (T1/m)^1/2

n2 = 1.1 x n1 ---(v)

Putting the value of n2 from Eq. (v) in Eq. (iii), we get, 1.1n1 âˆ’ n1=10

0.1 x n1 = 10 n1 = 100Hz

QUESTION: 47

Radius of a soap bubble is increased from R to 2R work done in this process in terms of surface tension is

Solution:

Work done in terms of surface tension is given by:

W=8Ï€S(R2^2 âˆ’ R1^2) = 8Ï€S[(2R)^2 âˆ’ R^2] = 24Ï€R^2S
QUESTION: 48

According to Joule's law, if the potential difference across a conductor having a material of specific resistance remains constant, then the heat produced in the conductor is directly proportional to

Solution:

QUESTION: 49

On giving 220 V to a resistor the power dissipated is 40 W then value of resistance is

Solution:

QUESTION: 50

For a given temperature difference, which of the following pairs will generate maximum thermo e.m.f.

Solution:

QUESTION: 51

A sample of an ideal gas occupies a volume '*V*' at a pressure '*P*' and absolute temperature '*T*'. The mass of each molecule is *m*. The expression for the density of gas is

Solution:

QUESTION: 52

A mono atomic gas is supplied the heat Q very slowly keeping the pressure constant. The work done by the gas will be

Solution:

QUESTION: 53

A 10 kg mass falls through 25 m on to the ground and bounces to a height of 0.50 m. Assume that all potential energy lost is used in heating up the mass. The temperature rise will be (Given specific heat of the material is 252 Joule/kg K)

Solution:

QUESTION: 54

Dimensions of luminous flux are

Solution:

QUESTION: 55

The surface tension of a liquid is 70 dyne/cm. In MKS system its value is

Solution:

QUESTION: 56

When a source of light is receding away from an observer, then the spectral lines will get displaced towards

Solution:

QUESTION: 57

If a source of light is moving away from a stationary observer, then frequency of light wave appears to change because of

Solution:

QUESTION: 58

At which temperature the speed of sound in hydrogen will be same as that of speed of sound in oxygen at 100^{o}C

Solution:

QUESTION: 59

A standing wave having 3 nodes and 2 antinodes is formed between two atoms having a distance 1.21 Å between them. The wavelength of the standing wave is

Solution:

QUESTION: 60

If velocity of a body is twice of previous velocity, then kinetic energy will become

Solution:

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