Grand Test 12 For NEET 2021

1.If the resultant of three forces F₁=pi+3j–k, F₂=-5i+j+2k and F₃=6i–k   acting on a particle has magnitude equal to 5 units then the value of p is:

2.A hoop rolls on a horizontal ground without slipping with linear speed speed v. speed of a particle p on the circumference of the hoop at angle θ is:

3.In young double slit experiment λ=500 nm, d=1mm and D=1m. find the minimum distance from the central Maxima for which the intensity is half of the maximum intensity.

4. A particle moving along a straight line with uniform acceleration has velocities 7m/s at A and 17 m/s at C,  B is the midpoint of AC. Then :-

5. A spherical planet far out in space has a mass M and diameter D. A particle of mass m falling near the surface of this planet will experience and acceleration due to gravity which is equal to:

6.Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature then it will show:

7.An arrow is shot into in air on a parabolic path to a target. Neglecting air resistance, at its highest point:-

8.A straight wire of magnetic moment M is modulated according to figure, then the magnetic moment becomes:

9.When photons of energy hf falls on an aluminium plate (of work function E₀), photoelectrons of maximum kinetic energy K are ejected. If the frequency of the radiation is doubled the maximum kinetic energy of the ejected photoelectrons will be:

10.Figure shows three circular arcs each of radius R and total charge as indicated. The net electric potential at the centre of the curvature:

11.Three moles of an ideal gas(C_p =7R/2) at pressure P_A and temperature T_A is isothermally expanded to twice its initial volume. It is then compressed at constant pressure to its original volume. Finally the gas is compressed at constant volume to its original pressure P_A. The correct P-V & P-T diagrams indicating the process are:

12.Which of the following loop is in stable equilibrium?

13.A light rod of length L is pivoted at the upper end. Two masses (each m) are attached to the rod, one at the middle and the other at the free end. What horizontal velocity must be imported to the lower end mass so that the road me just take up the horizontal:

14.A rod CD is rotated about the point C with the angular frequency of 5 rad/s. The length of the rod is 0.2 m the intensity of magnetic field is 0.3 T. The potential difference between the ends of the rod will be:

15.Two large parallel plates are connected with the terminal of 100 V power supply. These plates have a fine hole at the centre. An electron having energy 200 eV is so directed that it passes through the hole and when it comes out of itde-Broglie wavelength will be:

16.The physical quantity “energy density” has same dimensional formula as:

17. Consider the situation shown in figure. The force F is equal to the m₂g/2. if the area of cross section of the string is A and its Young’s modulus is Y, find the strain developed in it. The string is light and there is no friction anywhere:

18.A physical quantity is A=P²/Q³ the percentage error in measurement of P and Q is x and y respectively. Maximum error in measurement of A is:

19.If A, B and C have magnitude 12, 5 and 13 respectively and A+B=C then angle between A & B is:

20.A saquare current carrying loop is suspended in  a uniform magnetic field acting in the plane of the loop the force on one arm of the loop is F. The net force on the remaining three arms of the loop is:

21.square object of area 100 sq. cm is placed perpendicular to the principal axis of a concave mirror. If the lateral magnification of the mirror for the above object position is 0.4 then the area of the image will be:

22.Eight resistances each of resistance 5 ohm are connected in the circuit shown in figure. The equivalent resistance between A and B in ohm unit is:

23.. Nuclear fusion is common to the pair:

24.Which of the following is correct?

25.A weel having moment of inertia 2 kg-m² about its vertical Axis, rotates at the rate of 60 rpm about  the axis.the torque(in N-m) which can stop the whee’s rotation in 1 minute would be:

26. A missile is fired in horizontal direction from a height of 20m at a speed of 1000 m/s.  At what distance of ground will the missile land?

27. two infinitely long parallel wires having linear charge densits λ₁ and λ₂ respectively are placed at a distance r. The force per unit length on either wire will be:

28.the length of the seconds pendulum is decreased by 0.3 cm when it is shifted to Chennai from London. if the acceleration due to gravity at London is 981 cm/s², acceleration due to gravity at Chennai is: (assuming π²=10)

29.For a parallel beam of monochromatic light of wavelength λ, diffraction is produced by a single slit whose width ‘a’ is of the order of wavelength of the light. If D is the distance of the screen from the slit, the width of the central Maxima will be:

30.A pole is held vertically with one end on the ground. the length of the pole is 30m. The pole is allowed to fall. Assuming that the lower end of the pool does not sleep with what velocity will the upper end strikes the ground?

31.. The potential difference across C is:

32.A sinusoidal voltage of rms value of 200 V is connected to the diode and a capacitor C is in the circuit shown so that half wave rectifier occurs. the final potential difference in V cross C is:

33.what is the velocity v of a metallic ball of radius r falling in a tank of liquid at the instant when its acceleration is half of a freely falling body? (the density of metal and of liquid are ρ and σ respectively and viscosity of the liquid is η):

34.Three rods each of length L and mass M are placed along X Y and z axis in such a way that one end of each of the roads is at the origin. The moment of inertia of the system about z axis is:

35. In an electromagnetic wave the energy density associated with magnetic field will be:

36.a radioactive nucleus _ZX^A  emits 3 Alpha particles and 5 beta particles. The ratio of number of neutrons to that of protons in the product nucleus will be:

37.Two blocks of mass A=1kg and B=2kg are shown in figure. a force of 5 N is applied on A. coefficient of friction between B and B is 0.2 and between B and horizontal surface is 0.2. find the time taken for the front face of A to coincide with the front face of B:

38.which of the following represent displacement-time graph of two objects A and B are moving with zero relative velocity?

39.A force acting on an object varies with distance x as shown in the figure. work done by the force in moving object from x=0 to 8m is:

40.Two point charges + 8q and -2q located at x = 0 and x= L respectively. the location of a point on the x-axis at which net electric field due to these two point charges is zero,is

41. the value of equivalent capacitance of the combination shown in figure between the points P and Q is:

42.An aluminium ring faces and electromagnet A. the current through A can be altered. then which of the following statement is correct:

43.A thin convex lens is made of a material of refractive index 1.6. An object is kept at a distance of u from the lens on the principal Axis as shown in the figure. The radius of curvature of the surfaces are 10 cm and 5 cm. now the lens is reversed such that the face having radius of curvature 5 cm lies close to the object. The distance between the image position as obtained for both the cases is equal to:

44.video Bhojpuri active substances A and B have their half life 1yr and 2yr  respectively. samples A and B  initially contain equal number of atoms. After 4 yr the ratio of the number of undecayed atom of A to the number of undecayed atom of B is:

45.Find the ratio of energy stored in 5 and 4 microfarad capacitor in the given circuit in steady state:

46.Ernst Mayr was known for

47.All of the following statements are true except

48.Match the column

Column-A                              Column-B

i.  Citrus canker          a. Predation

ii.  Diatom                b. Gullet

iii.Euglena                   c. Bacteria

iv. Paramoecium         d. Soap Box

49.Which of the following is the storage material of pyrenoids?

50.All are saprophytes except

51.All are from five kingdom system excluding

52.Which group of algae lack flagella?

53.Which is the correct match?

54.Fucus is a…………..alga

55.Find out which statements are wrong

I. Sugarcane have supporting roots coming out of the lower nodes of the stem, called prop roots

II. Pistia shows lateral branch with short internode and tuft roots

III. The leaves of Australian acacia expand, become green and synthesise food

IV. When stamens are attached to the petals as in the flowers of lily, it is called epiphyllous flower

56.The Q in the following diagram refers to

57.Aleurone layer is a………….layer of endosperm

58.Death of protoplasm is a prerequisite  for a vital  function like 

59.The diagram shows stage of secondary growth in a dicot root. Identify A

60.In bacteria Pili are

61.The cell wall component that is unusual in higher plant

61.All statemnets are true except?

63.The non-staining constrictions at a constant location of chromosome is called

64.It is important that the centromere not divide until the end of metaphase because it

65.Pachytene stage is characterised by

66.Uphill transport is a feature of

67.Water and solutes enter the vascular cylinder by

68.Deficiency symptom of which minerals are first observed in a senescent leaf?

69.Name the molecule in the below diagram, labelled as A

70. PEPcase is involved in

71.When fats are used in respiration, the RQ is

72.An organism growing in natural environment will show

73.Cells positioned away from root apical meristems differentiate as root-cap cells, while those pushed to the periphery mature as epidermis, this phenomenon is called

74.Match the following

Column-A                                                Column-B

1.ABA           a.Promote senescence

2.  Ethylene      b.Parthenocarpy

3.     Auxin        c.Delay senescence

4.  GAs            d. Inhibit seed germination

75.Which statement is not true?

76.A woman has a daughter. There are three men whom she claims might have been the father of the child. The judge in the paternity court orders that all three men, the child, and the mother have blood tests. The results are: mother, Type A; Daughter, Type O; Man #1, Type AB; Man #2, Type B; Man #3, Type O. The mother claims that this proves that Man #3 must be the little girl’s father. The judge isn’t satisfied, so he asks for the medical records of the people involved. He discovers that the little girl is colour-blind. Men #’s 1 and 2 are also colour-blind; Man #3 has normal colour vision, as does the mother. Assuming that one of these three men must be the father; can you now determine which of the three it is?

77. An X linked ,recessive allele is much more likely to be expressed in —-____(i)___than in____(ii)____

78.In replication, when two adjacent bases along one strand become linked together, they form a ______________

79.Which enzyme catalyses the synthesis of new strand for a DNA molecule, by linking nucleotides to the developing strand?

80.The viability of seeds is tested by 

81.Tissue culture technique can produce infinite number of new plants from a small parental tissue. The economic importance of the technique is in raising 

82.Match the column I and II and select the correct option using the codes given below

Column-I                                                  Column-II

1.Citric acid                                           i.Trichoderma

2.Cyclosporine A                                 ii. Clostridium

3. Statins                                               iii.Aspergillus

4.Butyric acid                                      iv.Monascus

83.Which one of the following statements is correct? 

84.Assertion: Desert lizards lack the physiological ability that mammals have to deal with the high temperatures of their habitat, but manage to keep their body temperature fairly constant by behavioural means.

Reason: Adaptation phenomenon

85..Population density is designated as

86.Calotropis is poisonous cause it produces

87.Competitive exclusion theory was proposed by

88.The largest reservoir of phosphorus in the biosphere is the

89.For frugivorous (fruit-eating) birds and mammals in the tropical forests of different continents, the slope in log scale relationship is found to be

90The blends of Polyblend and bitumen, when used to lay roads, enhanced the bitumen’s water repellent properties, and helped to increase road life by a factor of three. The raw material for creating Polyblend is

91.Which statemnets are wrong?

I. In Asterias excretory system is absent but water vascular system is present

II. In Balanoglossus fertilisation is internal and development is indirect

III. In Lancelet the notochord is present only in larval tail

IV. In Hyla alimentary canal, urinary and reproductive tracts open into a common chamber called cloaca

92.The body symmetry of Pila is

93.Which one is the correct match?

94.The Q in the below diagram is

95.All are sense organ except?

96.In the below diagram A is

97.Which one of the following have small molecular weight

98.A fat molecule has_____(i)_____ fatty acids, whereas a phospholipid has ___(ii)_____ fatty acids

99.Hydrogen cyanide binds to the active site of an enzyme that is the part of the pathway that forms ATP iin cells, in this way, it prevents the enzymes activity. Hence, hydrogen cyanide is

100.The curve given below shows enzymatic activity in relation to three conditions (pH, temperature and substrate concentration)What do the two axis (x and y) represent?

      x-axis                         y-axis

A.Enzymatic activity         pH

B.Temperature        Enzyme activity

C.Substrate              Enzymatic activity

Concentration

D.Enzymatic activity      Temperature

101.Which is the incorrect pair?

102.Epithelial cells of the intestine involved in food  absorption  have on their surface 

103.Lamina  propria is connected with 

104.When you hold your breath, which of the following gas changes in blood would  first lead to the urge to breathe? 

105.Although  much  CO 2  is  carried  in  blood,  yet  blood  does  not become acidic,  because 

106.The vertebrate organ receives only oxygenated blood? 

107.Given below are four statemnets(I-IV)

I. Arteries are thick walled and have narrow lumen blood circulatory system

II. Angina is acute chest pain when the blood circulation to the brain is reduced

III.  Persons with the blood group AB can donate blood to any person with any blood group under ABO system

IV. Calcium ions play a very important role in blood clotting process

Which of two of the above statements are correct?

108.Component of blood responsible for producing  antibodies is 

109.Removal of proximal convoluted tubule from the nephron will result in 

110.Brush border is characteristic of 

111.The ion responsible for unmasking of active sites for myosin for cross bridge activity during muscle contraction

112.Which statement is correct for muscle contraction?

113.Which of the following regions of the brain is incorrectly paired with its function? 

114. Sympathetic nervous system induces

115.Norepinephrine

I. Is released by sympathetic fibres

II. Is released by parasympathetic fibres

III. Increases the heart rate

IV. Decreases blood pressure

Which of the above statements are correct?

116.ADH or  vasopressin is 

117.Which of the following pairs is not correctly matched?

Mode of reproduction                                  Example

A.   Binary fission                                            Sargassum

B. Conidia                                                        Penicillium

C.Offset                                                             Water hyacinth

D.Rhizome                                                        Banana

118.Which one of the following generates new genetic combinations leading to variation?

119.Select the incorrect statement

120.Cells become variable in morphology and function in different regions of the embryo. The process is 

121.Name the following structure labelled A

122.Match the following

Column-I                                Column-II

I. Norplant       a. Mala D

II. IUD               b. Nirodh

III.  Oral pills     c. Copper T

IV. Condom        d. Implant

123. In context of amniocentesis, which of the following statements is incorrect?

124.Artificial insemination means 

125.Which of the following had the smallest brain capacity? 

126.Correct order is

127.Basic principles of embryonic development were  pronounced  by

128.If you suspect major deficiency of antibodies in a person, to which of the following  would you look for confirmatory evidence? 

129.If  a person  shows production of Interferons in  his  body,  the  chances  are  that  he  has  got  an  infection  of 

130.The genetically­ modified (GM) Brinjal in India  has  been  developed  for 

131.Production  of  a  human  protein in  bacteria  by  genetic  engineering  is  possible  because 

132.The Ti plasmid is often used for making transgenic plants.  The plasmid is  found  in 

133.

Restriction endonuclease was first isolated in __i___ from ___ii__

134.Which one of the following bacteria has found extensive use in genetic engineering 

 Work in plants? 

135.For transformation, micro particles  coated  with DNA to be bombarded with gene are made up of 

136.5 mole of each of H₂, SO₂ and CH₄ are kept in a container. A hole was made in the container. After 3 hours, the order of partial pressures in the containers will be,

137.As the nuclear charge increases from neon to calcium, the orbital energies,

138.The enthalpies of formation of Al₂O₃ and Cr₂O₃ are -1596 kJ and -1134 kJ respectively. ∆H for the reaction, 2Al + Cr₂O₃ → 2Cr + Al₂O₃ is,

139.Lattice energy of an ionic compounds depends upon,

140.A steam of electrons from a heated filament was passed between two charged plates kept at a potential difference V esu. If e and m are charge and mass of an electron respectively, then the value of h/λ is given by, (λ is wavelength associated with electron wave)

141.The oxidation of SO₂ by O₂ to SO₃ is an exothermic reaction. The yield of SO₃ will be maximum if,

142.The enolic form of acetone has,

143.Which one of the following sets of ions represents a collection of isoelectronic species?

144.Oxidation state of Cr in CrO₅ is,

145.If 0.5 mole of BaCl₂ is mixed with 0.2 mole of Na₃PO₄, the maximum number of moles of Ba₃(PO₄)₂ that can be formed is,

146.To prepare a buffer solution of pH 8.26 amount of (NH₄)₂SO₄ to be added to 500 mL of 0.01 M NH₄OH solution is, (pK_a (NH₄⁺) = 9.26)

147.Electronegativity and electron affinity of an element A are X and Y respectively. Hence ionization potential of A is,

148.Fuel used for rocket propulsion is a mixture of:

149.Phosphate fertilizers when added to water leads to

150.Stability of nitrides of IIA group elements is in order:

151.For the reaction 2A + 3B → products, A is in excess and on changing the concentration of B from 0.1 M to 0.4 M rate becomes doubled. Thus, rate law is,

152.A compound (X) on hydrolysis gave an acid and alcohol. Acid gave violet color with neutral FeCl₃ while alcohol gave yellow precipitate on boiling with I₂ and NaOH. X can be,

153.25 mL of an aqueous solution of KCl was found to require 20 mL of 1 m AgNO₃ solution when titrated using a K₂Cr₂O₇ as indicator. Depression in freezing point of KCl solution with 100% ionization will be: (K_f = 2.0^o mol^-1 kg)

154.Conductance of 0.1 M KCl (Conductivity = X mho cm^-1) filled in a conductivity cell is Y mho. If the conductance of 0.1 M NaOH filled in the same cell is Z mho, the molar conductance of NaOH will be,  

155.The volume strength of 2.5 N H₂O₂ solution is,

156.FeO crystal has a simple cubic structure and each edge of the unit cell is 5 Å. Taking density of the oxide as 4 g/cc, the number of Fe²⁺ and O^2- ions present in each unit cell are,

157.The pair in which both species have the same magnetic moment (spin only values) is,

158.Which of the following is an incorrect statement?

159.Monosaccharides usually contains the no. of carbon atoms

160.Concentrated HCl when kept in open air sometimes produces a cloud of white fumes. The explanation for it is that,

161.When aniline reacts with oil of bitter almonds, condensation takes place and benzal derivative is formed. This is known as,

162.Standard electrode potentials (E^o) are: Fe²⁺/Fe = -0.44 V and Fe³⁺/Fe = +0.77 V; If Fe²⁺, Fe³⁺ and Fe are kept in a block together, then

163.Yellow ammonium sulphide is

164.A solution containing 2.675 g of CoCl₃.6NH₃ (molar mass = 267.5 g mol^-1) is passes through a cation exchanger. The chloride ions obtained in solution were treated with excess of AgNO₃ to give 4.78 g of AgCl (molar mass = 143.5 g mol^-1). The formula of the complex is, (Ag = 108)

165. If sodium sulphate is considered to be completely dissociated into cations and anions in solution, the change in freezing point of water, when 0.01 mol of sodium sulphate is dissolved in 1 kg of water is, (Kf (H2O) = 1.86 K m-1)

166.An explosion take place when conc. Sulphuric acid is added to potassium permanganate. Which of the following is formed?

167.The gas liberated by the electrolysis of Dipotassium succinate solution is,

168.Which of the following statements is correct?

169.The accepted IUPAC name of the camphor is,

170.Concentration of the Ag⁺ ions in a saturated solution of Ag₂C₂O₄ is 2.2 × 10^-4 mol L^-1. Solubility product of Ag₂C₂O₄ is,

171.Which of the following reagents used for the given synthesis?

172.Which of the following substrates will give rearranged product in hydration reaction?

173.Determine the final product A in the following reaction series:

174.The number of chiral centers in the compound ‘A’ is,

175.Hydrogenation of following compound in presence of poisoned palladium catalyst gives

176.CH₃CH₂-Br + Nu^– → CH₂=CH₂ + Br^–. The decreasing order of the rate of reaction with nucleophiles (Nu^–) A to D is, [Given Nu^– = (A) PhO^–, (B) AcO^–, (C) HO^–, (D) CH₃O^–]

177.Zerevitinov’s determination of active hydrogen in a compound is based upon its reaction with,

178.An organic compound ‘A’ on treatment with NH₃ gives ‘B’ which on heating gives ‘C’, ‘C’ when treated with Br₂ in the presence of KOH produces ethylamine. Compound ‘A’ is,

179.o-Methoxybromobenzene is treated with sodamide and then with ammonia. The product formed is,

180.The polymer containing strong intermolecular forces such as hydrogen bonding,