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NEET 2019 Question Paper with Solutions- Physics

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Posted by Mahak Jain, 21/1/2021
NEET 2019 Question Paper with Solutions- Physics

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NEET 2019 Question Paper with Solutions

Question 1

When a block of mass M is suspended by a long wire of length L, the length of the wire becomes (L + l). The elastic potential energy stored in the extended wire is:

  1. Mgl
  2. MgL
  3. 0.5 Mgl
  4. 0.5 MgL

Correct answer: 3

NEET 2019 question paper physics When a block of mass M is suspended by a long wire of length L, the length of the wire becomes (L + l). The elastic potential energy stored in the extended wire is:

Question 2

A mass m is attached to a thin wire and whirled in a vertical circle. The wire is most likely to break when:

  1. the mass is at the highest point
  2. the wire is horizontal
  3. the mass is at the lowest point
  4. inclined at an angle of 60° from vertical

Correct answer: 3

A mass m is attached to a thin wire and whirled in a vertical circle. The wire is most likely to break when NEET 2019 question paper physics

Question 3

Ionized hydrogen atoms and α-particles with same momenta enters perpendicular to a constant magnetic field, B. The ratio of their radii of their paths rH :rα will be:

  1. 2 : 1
  2. 1 : 2
  3. 4 : 1
  4. 1 : 4

Correct answer: 1

Ionized hydrogen atoms and α-particles with same momenta enters perpendicular to a constant magnetic field, B. The ratio of their radii of their paths rH :rα will be: NEET 2019 question paper physics

Question 4

Body A of mass 4m moving with speed u collides with another body B of mass 2m, at rest. The collision is head on and elastic in nature. After the collision the fraction of energy lost by the colliding body A is:

  1. 1/9
  2. 8/9
  3. 4/9
  4. 5/9

Correct answer: 2

Body A of mass 4m moving with speed u collides with another body B of mass 2m, at rest. The collision is head on and elastic in nature. After the collision the fraction of energy lost by the colliding body A is NEET 2019 question paper physics

Question 5

In a double slit experiment, when light of wavelength 400 nm was used, the angular width of the first minima formed on a screen placed 1 m away, was found to be 0.2°. What will be the angular width of the first minima, if the entire experimental apparatus is immersed in water? (μwater = 4/3)

  1. 0.266°     
  2. 0.15°
  3. 0.05°
  4. 0.1°

Correct answer: 2

NEET 2019 question paper physics In a double slit experiment, when light of wavelength 400 nm was used, the angular width of the first minima formed on a screen placed 1 m away, was found to be 0.2°. What will be the angular width of the first minima, if the entire experimental apparatus is immersed in water

Question 6

In which of the following devices, the eddy current effect is not used? 

  1. Induction furnace
  2. Magnetic braking in train
  3. Electromagnet
  4. Electric heater

Correct answer: 4

In which of the following devices, the eddy current effect is not used

Question 7

A soap bubble, having a radius of 1 mm, is blown from a detergent solution having a surface tension of 2.5 × 10–2 N/m. The pressure inside the bubble equals at a point Z0 below the free surface of water in a container. Taking g = 10 m/s2, density of water = 103 kg/m3, the value of Z0 is:

  1. 100 cm
  2. 10 cm
  3. 1 cm
  4. 0.5 cm

Correct answer: 3

NEET 2019 question paper physics A soap bubble, having a radius of 1 mm, is blown from a detergent solution having a surface tension of 2.5 × 10–2 N/m. The pressure inside the bubble equals at a point Z0 below the free surface of water in a container. Taking g = 10 m/s2, density of water = 103 kg/m3, the value of Z0 is:

Question 8

Which color of the light has the longest wavelength? 

  1. Red
  2. Blue
  3. Green
  4. Violet

Correct answer: 1

Which color of the light has the longest wavelength

Question 9

A disc of radius 2 m and mass 100 kg rolls on a horizontal floor. Its centre of mass has a speed of 20 cm/s. How much work is needed to stop it?

  1. 3 J
  2. 30 kJ
  3. 2 J
  4. 1 J

Correct answer: 1

A disc of radius 2 m and mass 100 kg rolls on a horizontal floor. Its centre of mass has a speed of 20 cm/s. How much work is needed to stop it

Question 10

The displacement of a particle executing simple harmonic motion is given by

y = A0 + Asin(ωt) + Bcos(ωt)

Then the amplitude of its oscillation is given by: 

  1. Ao+ (A2+B2 )1/2
  2. (A2+B2 )1/2
  3. (A0 2 + (A+B)2)1/2
  4. A+B

Correct answer: 2

The displacement of a particle executing simple harmonic motion is given by NEET 2019 question paper physics

Question 11

Two similar thin equi-convex lenses, of focal length f each, are kept coaxially in contact with each other such that the focal length of the combination is F1. When the space between the two lenses is filled with glycerine (which has the same refractive index (μ = 1.5) as that of glass) then the equivalent focal length is F2. The ratio F1 :  F2 will be :

  1. 2 : 1
  2. 1 : 2
  3. 2 : 3  
  4. 3 : 4

Correct answer: 2

Two similar thin equi-convex lenses, of focal length f each, are kept coaxially in contact with each other such that the focal length of the combination is F1. When the space between the two lenses is filled with glycerine (which has the same refractive index (μ = 1.5) as that of glass) then the equivalent focal length is F2. The ratio F1 :  F2 will be

Question 12

Increase in temperature of a gas filled in a container would lead to: 

1. Increase in its mass

2. Increase in its kinetic energy

3. Decrease in its pressure

4. Decrease in intermolecular distance

Correct answer: 2

Increase in temperature of a gas filled in a container would lead to:

Question 13

An electron is accelerated through a potential difference of 10,000 V. Its de Broglie wavelength is, (nearly) : (me = 9 × 10–31 kg) 

1. 12.2 × 10–13 m

2. 12.2 × 10–12 m

3. 12.2 × 10–14 m

4. 12.2 nm

Correct answer: 2

An electron is accelerated through a potential difference of 10,000 V. Its de Broglie wavelength is, (nearly)

Question 14

A copper rod of 88 cm and an aluminium rod of unknown length have their increase in length independent of increase in temperature. The length of aluminium rod is: (αCu  = 1.7 × 10–5 K–1 and αAl = 2.2 × 10–5 K–1)

  1. 6.8 cm
  2. 113.9 cm
  3. 88 cm
  4. 68 cm

Correct answer: 4

NEET 2019 question paper physics A copper rod of 88 cm and an aluminium rod of unknown length have their increase in length independent of increase in temperature. The length of aluminium rod is

Question 15

Pick the wrong answer in the context with rainbow.

  1. When the light rays undergo two internal reflections in a water drop, a secondary rainbow is formed
  2. The order of colors is reversed in the secondary rainbow
  3. An observer can see a rainbow when his front is towards the sun
  4. Rainbow is a combined effect of dispersion refraction and reflection of sunlight

Correct answer: 3

Pick the wrong answer in the context with rainbow

Question 16

A body weighs 200 N on the surface of the earth. How much will it weigh half way down to the centre of the earth?

  1. 150 N
  2. 200 N
  3. 250 N
  4. 100 N

Correct answer: 4

A body weighs 200 N on the surface of the earth. How much will it weigh half way down to the centre of the earth

Question 17

Six similar bulbs are connected as shown in the figure with a DC source of emf E and zero internal resistance. The ratio of power consumption by the bulbs when (i) all are glowing and (ii) in the situation when two from section A and one from section B are glowing, will be:

NEET 2019 question paper physics Six similar bulbs are connected as shown in the figure with a DC source of emf E and zero internal resistance. The ratio of power consumption by the bulbs when (i) all are glowing and (ii) in the situation when two from section A and one from section B are glowing, will be
  1. 4 : 9
  2. 9 : 4
  3. 1 : 2
  4. 2 : 1

Correct answer: 2

Six similar bulbs are connected as shown in the figure with a DC source of emf E and zero internal resistance. The ratio of power consumption by the bulbs when (i) all are glowing and (ii) in the situation when two from section A and one from section B are glowing, will be

Question 18

For a p-type semiconductor, which of the following statements is true?

  1. Electrons are the majority carriers and trivalent atoms are the dopants.
  2. Holes are the majority carriers and trivalent atoms are the dopants.
  3. Holes are the majority carriers and pentavalent atoms are the dopants.
  4. Electrons are the majority carriers and pentavalent atoms are the dopants.

Correct answer: 2

For a p-type semiconductor, which of the following statements is true

Question 19

For a p-type semiconductor, which of the following statements is true:

  1. Aω/2 
  2. Aω  
  3. 2 /2 
  4. Zero  

Correct answer: 4

For a p-type semiconductor, which of the following statements is true

Question 20

The unit of thermal conductivity is:

  1. J m K–1
  2. J m–1 K–1
  3. W m K–1
  4. W m–1 K–1

Correct answer: 4

The unit of thermal conductivity is

Question 21

A solid cylinder of mass 2 kg and radius 4 cm rotating about its axis at the rate of 3 rpm. The torque required to stop after 2π revolutions is

  1. 2 × 10–6 N m
  2. 2 × 10–3 N m
  3. 12 × 10–4 N m
  4. 2 × 106 N m

Correct answer: 1

NEET 2019 question paper physics A solid cylinder of mass 2 kg and radius 4 cm rotating about its axis at the rate of 3 rpm. The torque required to stop after 2π revolutions is

Question 22

A force F = 20 + 10 y acts on a particle in y-direction where F is in newton and y in meter. Work done by this force to move the particle from 

y = 0 to y = 1 m is

  1. 30 J
  2. 5 J
  3. 25 J
  4. 20 J

Correct answer: 3

Question 23

Which of the following acts as a circuit protects device? 

  1. Conductor
  2. Inductor
  3. Switch
  4. Fuse

Correct answer: 4

Which of the following acts as a circuit protects device

Question 24

In the circuits shown below, the readings of  voltmeters and the ammeters

NEET 2019 question paper with solutions physics
NEET 2019 question paper with solutions physics

1. V2 > V1 and i1 = i2

2. V1 = V2 and i1 > i2

3. V1 = V2 and i1 = i2

4. V2  > V1 and i1 > i2

Correct answer: 3

In the circuits shown below, the readings of  voltmeters and the ammeters

Question 25

A hollow metal sphere of radius R is uniformly charged. The electric field due to the sphere at a distance r from the centre

  1. Increases as r increases for r < R and for r > R
  2. Zero as r increases for r < R, decreases as r increases for r > R
  3. Zero as r increases for r < R, increases as r increases for r > R
  4. Decreases as r increases for r < R and for r > R

Correct answer: 2

A hollow metal sphere of radius R is uniformly charged. The electric field due to the sphere at a distance r from the centre

Question 26

At a point A on the earth’s surface the angle of dip, δ=+25°. At a point B on the earth’s surface the angle of dip, δ=–25°. We can interpret that:

  1. A and B are both located in the northern hemisphere.
  2. A is located in the southern hemisphere and B is located in the northern hemisphere.
  3. A is located in the northern hemisphere and B is located in the southern hemisphere.
  4. A and B are both located in the southern hemisphere.

Correct answer: 3

At a point A on the earth’s surface the angle of dip, δ=+25°. At a point B on the earth’s surface the angle of dip, δ=–25°. We can interpret that

Question 27

The total energy of an electron in an atom in an orbit is –3.4 eV. Its kinetic and potential energies are, respectively: 

1. –3.4 eV, –3.4 eV

2. –3.4 eV, –6.8 eV

3. 3.4 eV, –6.8 eV

4. 3.4 eV, 3.4 eV

Correct answer: 3

The total energy of an electron in an atom in an orbit is –3.4 eV. Its kinetic and potential energies are, respectively NEET 2019 question paper physics

Question 28

In total internal reflection when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be angle of refraction?

  1. 180°
  2. Equal to angle of incidence
  3. 90°

Correct answer: 4

NEET 2019 question paper physics In total internal reflection when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be angle of refraction

Question 29

The work done to raise a mass m from the surface of the earth to a height h, which is equal to the radius of the earth, is:

  1. mgR
  2. 2 mgR
  3. 0.5 mgR
  4. 1.5 mgR

Correct answer: 3

The work done to raise a mass m from the surface of the earth to a height h, which is equal to the radius of the earth, is

Question 30

When an object is shot from the bottom of a long smooth inclined plane kept at an angle 60° with horizontal, it can travel a distance x1 along the plane. But when the inclination is decreased to 30° and the same object is shot with the same velocity, it can travel x2 distance. Then x1 : x2 will be:

  1. 1:√2
  2. √2:1
  3. 1:√3
  4. 1:2√3

Correct answer: 3

When an object is shot from the bottom of a long smooth inclined plane kept at an angle 60° with horizontal, it can travel a distance x1 along the plane. But when the inclination is decreased to 30° and the same object is shot with the same velocity, it can travel x2 distance. Then x1 : x2 will be

Question 31

α-particle consists of:

1. 2protons and 2neutrons only

2. 2protons, 2electrons and 2neutrons

3. 2electrons and 4protons only

4. 2protons only

Correct answer: 1

α-particle consists of

Question 32

The speed of a swimmer in still water is 20 m/s. The speed of river water is 10 m/s and is flowing due east. If he is standing on the south bank and wishes to cross the river along the shortest path the angle at which he should make his strokes w.r.t. north is given by:

  1. 30° west
  2.  0°
  3. 60° west
  4. 45° west

Correct answer: 1

The speed of a swimmer in still water is 20 m/s. The speed of river water is 10 m/s and is flowing due east. If he is standing on the south bank and wishes to cross the river along the shortest path the angle at which he should make his strokes w.r.t. north is given by NEET 2019 question paper physics

Question 33

A particle moving with velocity V is acted by three forces shown by the vector triangle PQR. The velocity of the particle will:

A particle moving with velocity V is acted by three forces shown by the vector triangle PQR. The velocity of the particle will
  1. increase
  2. decrease
  3. remain constant
  4. change according to the smallest force

Correct answer: 3

A particle moving with velocity V is acted by three forces shown by the vector triangle PQR. The velocity of the particle will

Question 34

Two particles A and B are moving in uniform circular motion in concentric circles of radii rA and rB with speed vA and vB respectively. Their time period of rotation is the same. The ratio of angular speed of A to that of B will be:

  1. rA:rB
  2. vA: vB
  3. rB:rA
  4. 1:1

Correct answer: 4

Two particles A and B are moving in uniform circular motion in concentric circles of radii rA and rB with speed vA and vB respectively. Their time period of rotation is the same. The ratio of angular speed of A to that of B will be

Question 35

A block of mass 10 kg is in contact against the inner wall of a hollow cylindrical drum of radius 1 m. The coefficient of friction between the block and the inner wall of the cylinder is 0.1. The minimum angular velocity needed for the cylinder to keep the block stationary when the cylinder is vertical and rotating about its axis, will be:  (g=10 m/s2)  

  1. √10  rad/s
  2. 10/2π  rad/s
  3. 10 rad/s
  4. 10π rad/s

Correct answer: 3

NEET 2019 question paper physics A block of mass 10 kg is in contact against the inner wall of a hollow cylindrical drum of radius 1 m. The coefficient of friction between the block and the inner wall of the cylinder is 0.1. The minimum angular velocity needed for the cylinder to keep the block stationary when the cylinder is vertical and rotating about its axis, will be

Question 36

Two parallel infinite line charges with linear charge densities +λ C/m and -λ C/m are placed at a distance of 2R in free space. What is the electric field mid-way between the two line charges?

  1. Zero
  2. 2λ/(πεoR) N/C
  3. λ/(πεoR) N/C
  4. λ/(2πεoR) N/C

Correct answer: 3

Two parallel infinite line charges with linear charge densities +λ C/m and -λ C/m are placed at a distance of 2R in free space. What is the electric field mid-way between the two line charges

Question 37

Two point charges A and B, having charges +Q and –Q respectively, are placed at certain distance apart and force acting between them is F. If 25% charge of A is transferred to B, then force between the charges becomes:

  1. F
  2. 9F/16
  3. 16F/9
  4. 4F/3

Correct answer: 2

Two point charges A and B, having charges +Q and –Q respectively, are placed at certain distance apart and force acting between them is F. If 25% charge of A is transferred to B, then force between the charges becomes

Question 38

A small hole of area of cross-section 2 mm2 is present near the bottom of a fully filled open tank of height 2 m. Taking g = 10 m/s2, the rate of flow of water through the open hole would be nearly

  1. 12.6 × 10–6 m3/s
  2. 8.9 × 10–6 m3/s
  3. 2.23 × 10–6 m3/s
  4. 6.4 × 10–6 m3/s

Correct answer: 1

A small hole of area of cross-section 2 mm2 is present near the bottom of a fully filled open tank of height 2 m. Taking g = 10 m/s2, the rate of flow of water through the open hole would be nearly NEET 2019 question paper physics

Question 39

The correct Boolean operation represented by the circuit diagram drawn is:

NEET 2019 question paper with solutions physics
  1. AND
  2. OR
  3. NAND
  4. NOR

Correct answer: 3

The correct Boolean operation represented by the circuit diagram drawn is

Question 40

In which of the following processes, heat is neither absorbed nor released by a system?

  1. Isothermal
  2. Adiabatic
  3. Isobaric
  4. Isochoric

Correct answer: 2

In which of the following processes, heat is neither absorbed nor released by a system

Question 41

A 800 turn coil of effective area 0.05 m2 is kept perpendicular to a magnetic field 5 × 10–5 T.  When the plane of the coil is rotated by 90° around any of its coplanar axis in 0.1 s, the emf induced in the coil will be:

  1. 2 V
  2. 0.2 V
  3. 2 × 10–3 V
  4. 0.02 V

Correct answer: 4

A 800 turn coil of effective area 0.05 m2 is kept perpendicular to a magnetic field 5 × 10–5 T.  When the plane of the coil is rotated by 90° around any of its coplanar axis in 0.1 s, the emf induced in the coil will be

Question 42

The radius of circle, the period of revolution, initial position and sense of revolution are indicated in the fig.

NEET 2019 question paper physics The radius of circle, the period of revolution, initial position and sense of revolution are indicated in the fig.

y-projection of the radius vector of rotating particle P is:

1. y(t) = -3cos (2πt), where y in m

2. y(t) = 4sin (πt/2) , where y in m

3. y(t) = 3cos (3πt/2) , where y in m

 4. y(t) = 3cos (πt/2) , where y in m

Correct answer: 4

The radius of circle, the period of revolution, initial position and sense of revolution are indicated in the fig.

Question 43

A parallel plate capacitor of capacitance 20 μF is being charged by a voltage source whose potential is changing at the rate of 3 V/s. The conduction current through the connecting wires, and the displacement current through the plates of the capacitor, would be, respectively.

  1. Zero, 60 μA
  2. 60 μA , 60 μA
  3. 60 μA, zero
  4. Zero, Zero

Correct answer: 2

A parallel plate capacitor of capacitance 20 μF is being charged by a voltage source whose potential is changing at the rate of 3 V/s. The conduction current through the connecting wires, and the displacement current through the plates of the capacitor, would be, respectively

Question 44

In an experiment, the percentage of error occurred in the measurement of physical quantities A, B, C and D are 1%, 2%, 3% and 4% respectively. Then the maximum percentage of error in the measurement X, where X=A2B1/2/(C1/3D3), will be

  1. 3/13 %
  2. 16 %
  3. – 10 %
  4. 10 %

Correct answer: 2

In an experiment, the percentage of error occurred in the measurement of physical quantities A, B, C and D are 1%, 2%, 3% and 4% respectively. Then the maximum percentage of error in the measurement X

Question 45

A cylindrical conductor of radius R is carrying a constant current. The plot of the magnitude of the magnetic field. B with the distance d from the centre of the conductor, is correctly represented by the figure:

Correct answer: 3

A cylindrical conductor of radius R is carrying a constant current. The plot of the magnitude of the magnetic field. B with the distance d from the centre of the conductor, is correctly represented by the figure NEET 2019 question paper physics NEET 2019 question paper physics

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