NEET Practice Paper 2019

1) Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar.

The work done by the gas is

(Given that 1 L bar = 100 J)

2) A compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and the cations occupy 75% of octahedral voids.

The formula of the compound is :

3) pH of a saturated solution of Ca(OH)₂ is 9.

The solubility product (K_sp) of Ca(OH)₂ is:

4) The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber’s process is :

5) For an ideal solution, the correct option is

6) For a cell involving one electron E°cell= 0.59 Vat 298 K, the equilibrium constant for the cell reaction is :

[Given that 2.303 RT /F = 0.059V at T = 298 K]

7) Among the following, the one that is not a green house gas is

8) The number of sigma (σ) and pi (π) bonds in pent-2-en-4-yne is

9) Which of the following diatomic molecular species has only π bonds according to Molecular Orbital Theory?

10) Which of the following reactions are disproportionation reaction?

11) Among the following, the narrow spectrum antibiotic is :

12) The correct order of the basic strength of methyl substituted amines in aqueous solution is :

13) Which mixture of the solutions will lead to the formation of negatively charged colloidal [Agl]l– sol ?

14) Conjugate base for Bronsted acids H₂O and HF are :

15) Which will make basic buffer?

16) The compound that is most difficult to protonate is

17) The most suitable reagent for the following conversion, is

18) Which of the following species is not stable?

19) Which of the following is an amphoteric hydroxide?

20) The structure of intermediate A in the following reaction, is

Options

21) The manganate and permanganate ions are tetrahedral, due to :

22) For the second period elements the correct increasing order of first ionisation enthalpy is

23) If the rate constant for a first order reaction is k, the time (t) required for the completion of 99% of the reaction is given by

24) Identify the incorrect statement related to PCl₅ from the following:

25) 4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is

26) The biodegradable polymer is:

27) Match the Xenon compounds in Column-I with its structure in Column-II and assign the correct code:

28) Which is the correct thermal stability order for H₂E (E = O, S, Se, Te and Po)?

29) The correct structure of tribromooctaoxide is

30) An alkene “A” on reaction with O3 and Zn–H2O gives propanone and ethanal in equimolar ratio. Addition of HCl to alkene “A” gives “B” as the major product. The structure of product “B” is:

31) Enzymes that utilize ATP in phosphate transfer require an alkaline earth metal (M) as the cofactor. M is

32) Which one is malachite from the following?

33) Which of the following series of transitions in the spectrum of hydrogen atom fall in visible region?

34) The mixture that forms maximum boiling azeotrope is:

35) For the cell reaction

[Given that Faraday constant F = 96500 C mol^-1]

36) In which case change in entropy is negative?

37) Match the following :

Which of the following is the correct option?

38) Which of the following is incorrect statement?

39) The non-essential amino acid among the following is:

40) A gas at 350 K and 15 bar has molar volume 20 percent smaller than that for an ideal gas under the same conditions. The correct option about the gas and its compressibility factor (Z) is :

41) Among the following, the reaction that proceeds through an electrophilic substitution, is:

42) The major product of the following reaction is

43) For the chemical reaction

44) What is the correct electronic configuration of the central atom in K₄[Fe(CN)₆] based on crystal field theory?

45) The method used to remove temporary hardness of water is :

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

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

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

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

50) 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 )

51) 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 :

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 :

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

The displacement of a particle executing simple harmonic motion is given by y = A_{54) 0}+ Asinωt + Bcosωt
Then the amplitude of its oscillation is given by :

55) 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:

56) Average velocity of a particle executing SHM in one complete vibration is :

57) A soap bubble, having 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 :

58) A copper rod of 88 cm and an aluminum rod of unknown length have their increase in length independent of increase in temperature.

The length of aluminum rod is :

(α_Cu = 1.7 × 10^-5 K^-1 and α_Al = 2.2 × 10^-5 K^-1)

59) The unit of thermal conductivity is :

60) 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 :

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

62) 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 = A²B^1/2/C^1/3 D³ will be

63) 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 ?

64) Which colour of the light has the longest wavelength?

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

66) 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 :

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

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

69) 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 :

70) 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:

71) A force F = 20 + 10 y acts on a particle in ydirection 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

72) Pick the wrong answer in the context with rainbow.

73) 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 :

74) Two particles A and B are moving in uniform circular motion in concentric circles of radii r_A and r_B with speed v_A and v_B respectively. Their time period of rotation is the same. The ratio of angular speed of A to that of B will be :

75) 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 :

76) 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?

77) 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?

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

79) Which of the following acts as a circuit protection device?

80) 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.

81) In the circuits shown below, the readings of the voltmeters and the ammeters will be

82) α-particle consists of :

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

84) 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 x₂: x₂ will be:

85) 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

86) 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 :

87) 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 r_H : r_α will be :

88) A particle moving with velocity V is acted by three forces shown by the vector triangle PQR.

The velocity of the particle will :

89) 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:

90) 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 immerse in water? (μ_water= 4/3)

91) Which of the following statements is incorrect?

92) Purines found both in DNA and RNA are

93) Which of the following glucose transporters is insulin-dependent?

94) Identify the cells whose secretion protects the lining of gastro-intestinal tract from various enzymes.

95) Which one of the following equipments is essentially required for growing microbes on a large scale, for industrial production of enzymes?

96) Which of the following is true for Golden rice?

97) Which one of the following is not a method of in situ conservation of biodiversity?

98) Under which of the following conditions will there be no change in the reading frame of following mRNA?

5’AACAGCGGUGCUAUU3′

99) Which of these following methods is the most suitable for disposal of nuclear waste?

100) Match the following organisms with the products they produce

Select the correct option.

101) What map unit (Centimorgan) is adopted in the construction of genetic maps?

102) Select the hormone-releasing Intra-Uterine Devices.

103) Which of the following can be used as a biocontrol agent in the treatment of plant disease?

104) Expressed Sequence Tags (ESTs) refers to :

105) Colostrum the yellowish fluid, secreted by mother during the initial days of lactation is very essential to impart immunity to the new born infants because it contains

106) Select the incorrect statement.

107) Select the correct sequence for transport of sperm cells in male reproductive system.

108) A gene locus has two alleles A, a. If the frequency of dominant allele A is 0.4, then what will be the frequency of homozygous dominant, heterozygous and homozygous recessive individuals in the population?

109) Match the following organisms with their respective characteristics :

Select the correct option from the following :

110) The shorter and longer arms of a submetacentric chromosome are referred to as

111) What is the site of perception of photoperiod necessary for induction of flowering in plants?

112) Which part of the brain is responsible for thermoregulation?

113) Which of the following pair of organelles does not contain DNA?

114) What is the genetic disorder in which an individual has an overall masculine development gynaecomastia, and is sterile ?

115) Xylem translocates

116) Which of the following pairs of gases is mainly responsible for green house effect?

117) Which of the following protocols did aim for reducing emission of chlorofluorocarbons into the atmosphere?

118) In some plants, the female gamete develops into embryo without fertilization.

This phenomenon is known as

119) Which of the following sexually transmitted diseases is not completely curable?

120) Which of the following immune responses is responsible for rejection of kidney graft?

121) Which of the following factors is responsible for the formation of concentrated urine?

122) Which of the following features of genetic code does allow bacteria to produce human insulin by recombinant DNA technology?

123) Which of the following statements is not correct?

124) The concept of “Omnis cellula-e cellula” regarding cell division was first proposed by

125) Use of an artificial kidney during hemodialysis may result in :

(a) Nitrogenous waste build-up in the body
(b) Non-elimination of excess potassium ions
(c) Reduced absorption of calcium ions from gastro-intestinal tract
(d) Reduced RBC production

Which of the following options is the most appropriate?

126) What is the direction of movement of sugars in phloem?

127) Which of the following muscular disorders is inherited?

128) Consider following features

(a) Organ system level of organisation
(b) Bilateral symmetry
(c) True coelomates with segmentation of body

Select the correct option of animal groups which possess all the above characteristics

129) The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by :

130) Following statements describe the characteristics of the enzyme Restriction Endonuclease. Identify the incorrect statement.

131) Which of the following statements is incorrect?

132) Placentation in which ovules develop on the inner wall of the ovary or in peripheral part, is

133) Which of the following is the most important cause for animals and plants being driven to extinction?

134) Variations caused by mutation, as proposed by Hugo de Vries are

135) Respiratory Quotient (RQ) value of tripalmitin is

136) In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F₁ generation pink flowers were obtained. When pink flowers were selfed, the F₂ generation showed white, red and pink flowers.

Choose the incorrect statement from the following :

137) Select the incorrect statement.

138) The correct sequence of phases of cell cycle is

139) Thiobacillus is a group of bacteria helpful in carrying out

140) Polyblend, a fine powder of recycled modified plastic, has proved to be a good material for

141) From evolutionary point of view, retention of the female gametophyte with developing young embryo on the parent sporophyte for some time, is first observed in

142) Select the correct option.

143) Concanavalin A is

144) Extrusion of second polar body from egg nucleus occurs :

145) Pinus seed cannot germinate and established without fungal association.

This is because :

146) The Earth Summit held in Rio de Janeiro in 1992 was called

147) DNA precipitation out of a mixture of biomolecules can be achieved by treatment with

148) Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following

149) Match the following structures with their respective location in organs

Select the correct option from the following

150) Match the following hormones with the respective disease

Select the correct option.

151) Which of the following contraceptive methods do involve a role of hormone?

152) Drug called ‘Heroin’ is synthesized by

153) In a species, the weight of newborn ranges from 2 to 5 kg. 97% of the newborn with an average weight between 3 to 3.3 kg survive whereas 99% of the infants born with weight from 2 to 2.5 kg or 4.5 to 5 kg die.

Which type of selection process is taking place?

154) Conversion of glucose to glucose-6-phosphate, the first irreversible reaction of glycolysis, is catalyzed by

155) Which of the following statements is correct?

156) Which of the following ecological pyramids is generally inverted?

157) Consider the following statement :

(A)Coenzyme or metal ion that is tightly bound to enzyme protein is called prosthetic group.

(B) A complete catalytic active enzyme with its bound prosthetic group is called apoenzyme.

Select the correct option.

158) Due to increasing air-borne allergens and pollutants, many people in urban areas are suffering from respiratory disorder causing wheezing due to

159) Which one of the following statements regarding post-fertilization development in flowering plants is incorrect?

160) Phloem in gymnosperms lacks :

161) It takes very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield?

162) Persistent nucellus in the seed is known as

163) Cell in G₀ phase :

164) Match Column – I with Column – II Column – I Column – II

Choose the correct answer from the option given below

165) What would be the heart rate of a person if the cardiac output is 5 L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50 mL?

166) What triggers activation of protoxin to active Bt toxin of Bacillus thuringiensis in boll worm?

167) The ciliated epithelial cells are required to move particles or mucus in a specific direction. In humans, these cells are mainly present in

168) Which of the statements given below is not true about formation of Annual Rings in trees?

169) What is the fate of the male gametes discharged in the synergid?

170) Match the following genes of the Lac operon with their respective products :

Select the correct option.

171) Select the correct sequence of organs in the alimentary canal of cockroach starting from mouth

172) Match the hominids with their correct brain size :

Select the correct option.

173) Identify the correct pair representing the causative agent of typhoid fever and the confirmatory test for typhoid.

174) How does steroid hormone influence the cellular activities?

175) Tidal Volume and Expiratory Reserve Volume of an athlete is 500 mL and 1000 mL, respectively. What will be his Expiratory Capacity if the Residual Volume is 1200 mL?

176) Which of the following is a commercial blood cholesterol lowering agent?