Full Test - NEET PYQs (2024)

Botany - Section A

1.

Synapsis occurs between:

2.

Axillary bud and terminal bud are derived from the activity of:
1. Lateral meristem
2. Intercalary meristem
3. Apical meristem
4. Parenchyma

3. Which of the following are true about the taxonomical aid 'key' ?

Choose the most appropriate answer from the options given below :
1. (a), (b) and (c) only
2. (b), (c) and (d) only
3. (a), (b), (c) and (e) only
4. (a), (c), (d) and (e) only

4.

The floral formulais that of:
1. tulip
2. soybean
3. sunn hemp
4. tobacco

5. Which hormone promotes internode / petiole elongation in deep water rice?

6.

The association of histone H1 with a nucleosome indicates:
1. DNA replication is occurring
2. The DNA is condensed into a chromatin fibre
3. The DNA double helix is exposed
4. Transcription is occurring

7. Broad palm with single palm crease is visible in a person suffering from-

8.

Which of the following pair of micronutrients would help in the light phase of photosynthesis to help in the reaction leading to oxygen evolution?
1. Zinc and Chlorine
2. Manganese and Molybdenum
3. Molybdenum and Iron
4. Manganese and Chlorine

9.

Offsets are produced by:

10.

What is the reason for the formation of embryoids from pollen grain in tissue culture medium?
1. Cellular totipotency
2. Organogenesis
3. Double fertilization
4. Test tube culture

11. Movement and accumulation of ions across a membrane against their concentration gradient can be explained by:

12.

Mycorrhiza is an example of:
1. Symbiotic relationship
2. Ectoparasitism
3. Endoparasitism
4. Decomposers

13.

Eutrophication of water bodies leading to the killing of fishes is mainly due to non-availability of:
1. Food
2. Light
3. Essential minerals
4. Oxygen

14.

Which one produces gas by decomposing the gobar (Dung) in gobar gas:
1. Fungus
2. Virus
3. Methanogenic bacteria
4. Algae

15. Which out of the following statements is incorrect?

16.

Respiratory Quotient (RQ) value of tripalmitin is:

17.

Which of the following is not a step in Multiple Ovulation Embryo Transfer Technology (MOET)?

18.

Select the correct statement from the following regarding cell membrane:

19.

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

20. The primitive prokaryotes responsible for the production of biogas from the dung of ruminant animals, including the:
1. thermoacidophiles
2. methanogens
3. eubacteria
4. halophiles

21.

If a bamboo plant is growing in a far forest then what will its trophic level be:
1. First trophic level (T₁)
2. Second trophic level (T₂)
3. Third trophic level (T₃)
4. Fourth trophic level (T₄)

22. These are regarded as major causes of biodiversity loss:
A: Over exploitation
B: Co-extinction
C: Mutation
D: Habitat loss and fragmentation
E: Migration
Choose the correct option:
1. A, B, C and D only
2. A, B and E only
3. A, B and D only
4. A, C and D only

23.

Given are the following five statements (I - V) for your consideration:

How many of the above statements is/are correct?

24.

What occurs in crossing over:
1. Recombination
2. Mutation
3. Independent assortment
4. None

25.

Four radial V.B. are found in:
1. Dicot root
2. Monocot root
3. Dicot stem
4. Monocot stem

26.

Match Column I with Column II for housefly classification and select the correct option using the codes given below:

1. A-(iii) B-(i) C-(iv) D-(ii)
2. A-(iii) B-(ii) C-(iv) D-(i)
3. A-(iv) B-(iii) C-(ii) D-(i)
4. A-(iv) B-(ii) C-(i) D-(iii)

27.

Pneumatophores are found in:
1. The vegetation is found in marshy and saline lake
2. The vegetation is found in saline soil
3. Xerophytes
4. Epiphytes

28.

What is necessary for ripening of fruits:
1. 80% of ethylene
2. Abscisic acid
3. 2, 4 D
4. A.M.O. – 16

29.

In light of the above statements, choose the correct answer from the options given below:

30. A normal girl, whose mother is haemophilic marries a male with no ancestral history of haemophilia. What will be the possible phenotypes of the offsprings?

Choose the most appropriate answer from the options given below:
1. (a) and (b) only
2. (b) and (c) only
3. (a) and (d) only
4. (b) and (d) only

31. Which of the following protects nitrogenase inside the root nodule of a leguminous plant ?
1. Catalase
2. leg haemoglobin
3. Transaminase
4. Glutamate dehydrogenase

32.

Which of the following is/are vegetative propagule(s) ?
(a) Eyes of Potato
(b) Zoospore of Chlamydomonas
(c) Rhizome of Ginger
(d) Buds in Hydra
(e) Bulbil of Agave
Choose the most appropriate answer from the options given below :
1. (e) only
2. (a), (c), (e) only
3. (a), (b), (c), (d) only
4. (b), (d) only

33.

To obtain virus-free healthy plants from a diseased one by tissue culture technique, which part/parts of the diseased plant will be taken?

34.

Casparian bands are found in:

35. Given below are two statements:

In the light of the above statements, choose the correct answer from the options given below:
1. Statement I is incorrect but Statement II is correct.
2. Both Statement I and Statement II are correct.
3. Both Statement I and Statement II are incorrect.
4. Statement I is correct but Statement II is incorrect.

Botany - Section B

36.

In the cloning of cattle, a fertilized egg is taken out of the mother's womb and:

37. Which of the following is an example of actinomorphic flower?
1. Cassia
2. Pisum
3. Sesbania
4. Datura

38. Consider the following tissues in the stellar region of a stem showing secondary growth.
(A) Primary xylem
(B) Secondary xylem
(C) Primary phloem
(D) Secondary phloem
Arrange these in the correct sequence of their position from pith towards cortex.

39.

Which of the following structures performs the function of mitochondria in a bacteria?

40. Which one of the following is not correct as regards the harmful effects of particulate matter of the size 2.5 micrometers or less?
1. It can cause respiratory problems
2. It can directly enter into our circulatory system
3. It can cause inflammation and damage to the lungs
4. It can be inhaled into the lungs

41. Given below are two statements

In light of the above statements, choose the correct answer from the options given below:
1. Both Statement I and Statement II are True
2. Both Statement I and Statement II are False
3. Statement I is True but Statement II is False
4. Statement I is False but Statement II is True

42.

Some dividing cells exit the cell cycle and enter the vegetative inactive stage. This is called the quiescent stage$\left(G_0\right)$. This process occurs at the end of:
1.$G_1$$phase$
2. S phase
3.$G_2$$phase$
4. M phase

43.

The main difference between active and passive transport across cell membrane is :

44.

Geometric representation of age structure is a characteristic of:
1. Biotic community
2. Population
3. Landscape
4. Ecosystem

45.

Western Ghats have a large number of plant and animal species that are not found anywhere else. Which of the following terms will you use to notify such species?

46. Which of the following is incorrectly matched?
1.Volvox- Starch
2.Ectocarpus- Fucoxanthin
3.Ulothrix- Mannitol
4.Porphyra - Floridian starch

47.

In the majority of angiosperms:

48.

A test cross is carried out to:

49.

Who coined the term 'Kinetin'?
1. Skoog and Miller
2. Darwin
3. Went
4. Kurosawa

50.

Biosystematics aims at:

Zoology - Section A

51. Which of the following is not a complex polysaccharide?
1. Inulin
2. Chitin
3. Glucosamine
4. N-acetyl galactosamine

52. What is the correct sequence of sperm formation?

53.

Which of the following characteristic features always hold true for the corresponding group of animals?

1. a
2. b
3. c
4. d

54.

Nowadays, it is possible to detect the mutated gene causing cancer by allowing the radioactive probe to hybridise its complementary DNA in clone of cells, followed by its detection using autoradiography because:

55.

A certain road accident patient with an unknown blood group needs an immediate blood transfusion. His one doctor friend at once offers his blood. What was the blood group of the donor?
1. Blood group B
2. Blood group AB
3. Blood group O
4. Blood group A

56.

A childless couple can be assisted to have a child through a technique called GIFT. The full form of this technique is?
1. Gamete Inseminated Fallopian Transfer
2. Gamete Intra Fallopian Transfer
3. Gamete Internal Fertilisation and Transfer
4. Germ Cell Internal Transfer

57. Aunique vascular connection between the digestive tract and liver is called _______________ .
1. Hepato–pancreatic system
2. Hepatic portal system
3. Renal portal system
4. Hepato–cystic system

58.

Identify the correct statement with reference to human digestive system
1. Serosa is the innermost layer of the alimentary canal.
2. Ileum is a highly coiled part.
3. Vermiform appendix arises from duodenum.
4. Ileum opens into small intestine.

59. Given below are two statements:

In the light of the above statements, choose the most appropriate answer from the options given below:

60.

Biolistics (gene-gun) is suitable for:

61.

62. Nitrogenous waste is excreted in the form of pellet or paste by:

63.

In the regulation of respiration, a chemosensitive area adjacent to the rhythm centre in the medulla region of the brain, is highly sensitive to:
1.\(HCO^-_3\)
2.\(CO_2\)
3.\(O_2\)
4.\(N_2\)

64.

Which one of the following options gives the correct matching of a disease with its causative
organism and mode of infection:

65. Given below are some stages of human evolution. Arrange them in the correct sequence (Past to Recent):
A. Homo habilis
B. Homo sapiens
C. Homo neanderthalensis
D. Homo erectus
Choose the correct sequence of human evolution from the options given below :
1. B-A-D-C
2. C-B-D-A
3. A-D-C-B
4. D-A-C-B

66.

When both ovaries of a rat are removed then which hormone is decreased in blood:
1. Oxytocin
2. Prolactin
3. Estrogen
4. Gonadotrophic releasing factor

67.

Exoskeleton of arthropods is composed of :
1. Glucosamine
2. Cutin
3. Cellulose
4. Chitin

68. Given below are two statements: one is labelled as Assertion (A)and the other is labelled as Reason (R):

In the light of the above statements, choose the most appropriate answer from the options given below:

69.

Which of the following pairs are correctly matched?

1. A, C, and D
2, B, C, and D
3. Only A and D
4. Only A and B

70.

For effective treatment of the disease, early diagnosis and understanding of its pathophysiology is very important. Which of the following molecular diagnostic techniques is very useful for early detection?

71.

In the ABO system of blood groups, if both antigens are present but no antibody, the blood group of the individual would be:
1. O
2. AB
3. A
4. B

72.

What is the work of progesterone which is present in oral contraceptive pills:

73. Choose the correct statements :

Choose the most appropriate answer from the options given below :

74.

One of the constituents of the pancreatic juice, while poured into the duodenum in humans is:
1. Enterokinase
2. Trypsinogen
3. Chymotrypsin
4. Trypsin

75.

76.

Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R)

In the light of the above statements, choose the correct answer from the options given below:

77.

Ear wax secreting cells have which type of epithelium?
1. Columnar epithelium
2. Exocrine glandular epithelium
3. Compound epithelium
4. Endocrine glandular epithelium

78.

The maximum amount of electrolytes and water (70-80%) from the glomerular filtrate is reabsorbed in which part of the nephron?
1. Ascending limb of the loop of Henle
2. Distal convoluted tubule
3. Proximal convoluted tubule
4. Descending limb of the loop of Henle

79. Which of the following factors are favourable for the formation of oxyhaemoglobin in alveoli?
1. High\(\mathrm{pO}_2\)and Lesser\(\mathrm{H}^{+}\)concentration
2. Low\(\mathrm{pCO}_2\)and High\(\mathrm{H}^{+}\)concentration
3. Low\(\mathrm{pCO}_2\)and High temperature
4. High\(\mathrm{pO}_2\)and High\(\mathrm{pCO}_2\)

80.

Histamine is secreted by:

81.

Select the correct statement from the following:

82. Which of the following statements is correct in relation to the endocrine system?

83.

A competitive inhibitor of succinic dehydrogenase is:

84.

The shared terminal duct of the reproductive and urinary system in the human male is:
1. Urethra
2. Ureter
3. Vas deferens
4. Vasa efferentia

85.

Metagenesis refers to?

Zoology - Section B

86.

Which one of the following pair correctly matches a hormone with a disease resulting from its deficiency:
1. Insulin – Diabetes insipidus
2. Thyroxine – Tetany
3. Parathyroid hormone – Diabetes mellitus
4. Luteinizing hormone – Failure of ovulation

87.

Match the following columns and select the correct option :

88.

89.

Ureters act as urinogenital ducts in:
1. frog's males
2. human males
3. human females
4. frogs, both males and females

90.

Which of the following is associated with a decrease in cardiac output?
1. Sympathetic nerves
2. Parasympathetic neural signals
3. Pneumotaxic center
4. Adrenal medullary hormones

91.

Which one of the following represents a palindromic sequence in DNA?

92.

The essential chemical components of many coenzymes are:
1. Nucleic acid
2. Carbohydrates
3. Vitamins
4. Proteins

93.

94.

If for some reason the parietal cells of the gut epithelium become partially non-functional, what is likely to happen:

95.

96.

Analogous structures are results of?
1. convergent evolution
2. shared ancestry
3. stabilizing selection
4. divergent evolution

97. Match List I with List II:

Choose the correct answer from the options given below:
1. A-IV, B-III, C-I, D-II
2. A-III, B-I, C-IV, D-II
3. A-II, B-IV, C-III, D-I
4. A-I, B-III, C-II, D-IV

98.

The partial pressures (in mm Hg) of oxygen (O₂) and carbon dioxide (CO₂) at alveoli (the site of diffusion) are :
1.pO₂= 95 and pCO₂ = 40
2. pO₂ = 159 and pCO₂ = 0.3
3. pO₂ = 104 and pCO₂= 40
4. pO₂ = 40 and pCO₂= 45

99.

Match List - I with List - II regarding sensory organs in human.

Choose the correct answer from the option given below

100.

Chemistry - Section A

101. Which of the following sets represents a complex and a double salt, respectively?
1. CuSO₄.5H₂O and CuCl₂,4NH₃
2. PtCl₂.2NH₃ and PtCl₄.2HCl
3. K₂PtCl₂.2NH₃ and KAl(SO₄)₂.12H₂O
4. NiCl₂.6H₂O and NiCl₂(H₂O)₄

102.

Roasting of sulphides gives the gas X as a by-product. This is a colourless gas with a choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic and acts as an oxidizing agent and its acid has never been isolated. The gas X is:
1. SO₂
2. CO₂
3. SO₃
4. H₂S

103.

Which one of the following alkali metals forms only the normal oxide M₂O on heating in air?
1. Rb
2. K
3. Li
4. Na

104.

The liquefied gas that is used in dry cleaning along with a suitable detergent is-
1. Water gas
2. Petroleum gas
3. NO₂
4. CO₂

105.

Which one of the following is most reactive towards electrophilic attack?

1.		2.
3.		4.

106.

25.3 g of sodium carbonate, Na₂CO₃, is dissolved in enough water to make 250 mL of a solution. If sodium carbonatecompletelydissociates, the molar concentrations of sodium ion, Na⁺and carbonate ion,$C{O}_3^{2-}$are respectively:
(molar mass of Na₂CO₃= 106g mol^-1)
1. 0.955 M and 1.910 M
2. 1.910 M and 0.955 M
3. 1.90 M and 1.910 M
4. 0.477 M and 0.477 M

107.

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:
1.${\mathrm{C}}_3{\mathrm{A}}_4$
2.${\mathrm{C}}_2{\mathrm{A}}_3$
3.${\mathrm{C}}_3{\mathrm{A}}_2$
4.${\mathrm{C}}_4{\mathrm{A}}_3$

108.

The energies E₁ and E₂ of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths i.e.,${\mathrm{\lambda }}_1$and${\mathrm{\lambda }}_2$will be:
1.${\mathrm{\lambda }}_1=2{\mathrm{\lambda }}_2$
2.${\mathrm{\lambda }}_1=4{\mathrm{\lambda }}_2$
3.${\mathrm{\lambda }}_1=\frac{1}{2}{\mathrm{\lambda }}_2$
4.${\mathrm{\lambda }}_1={\mathrm{\lambda }}_2$

109. During the preparation of Mohr's salt solution (Ferrous ammonium sulphate), which of the following acid is added to prevent hydrolysis of Fe²⁺ion?
1. Concentrated sulphuric acid
2. Dilute nitric acid
3. Dilute sulphuric acid
4. Dilute hydrochloric acid

110.

Limiting molar conductivity of NH₄OH(i.e.,${\mathrm{\Lambda }}_{\mathrm{m}\left({\mathrm{NH}}_4\mathrm{OH}\right)}^0$is equal to -
1. ${\mathrm{\Lambda }}_{\mathrm{m}\left(\mathrm{NaOH}\right)}^0+{\mathrm{\Lambda }}_{\mathrm{m}\left(\mathrm{NaCl}\right)}^0-{\mathrm{\Lambda }}_{\mathrm{m}\left(\mathrm{NaOH}\right)}^0$
2. ${\mathrm{\Lambda }}_{\mathrm{m}\left(\mathrm{NaOH}\right)}^0+{\mathrm{\Lambda }}_{\mathrm{m}\left(\mathrm{NaCl}\right)}^0-{\mathrm{\Lambda }}_{\mathrm{m}\left({\mathrm{NH}}_4\mathrm{Cl}\right)}^0$
3. ${\mathrm{\Lambda }}_{\mathrm{m}\left({\mathrm{NH}}_4\mathrm{OH}\right)}^0+{\mathrm{\Lambda }}_{\mathrm{m}\left({\mathrm{NH}}_4\mathrm{Cl}\right)}^0-{\mathrm{\Lambda }}_{\mathrm{m}\left(HCl\right)}^0$
4. ${\mathrm{\Lambda }}_{\mathrm{m}\left({\mathrm{NH}}_4\mathrm{Cl}\right)}^0+{\mathrm{\Lambda }}_{\mathrm{m}\left(\mathrm{NaOH}\right)}^0-{\mathrm{\Lambda }}_{\mathrm{m}\left(\mathrm{NaCl}\right)}^0$

111.

The segment of DNA, that acts as the instrumental manual for the synthesis of the protein is:

112.

A 0.0020 m aqueous solution of an ionic compound Co(NH₃)₅(NO₂)Cl freezes at -0.0073 ^oC. The number of moles of ions that 1 mol of ionic compound produces on being dissolved in water will be:
(K_f = -1.86^oC/m)

113.

When a biochemical reaction is carried out in a laboratory outside the human body in the absence of an enzyme, then the rate of reaction obtained is${10}^{-6}$ times. The activation energy of a reaction in the presence of an enzyme is:
1.$\frac{6}{RT}$
2. P is required.
3. Different from$E_a$ obtained in the laboratory.
4. Data is insufficient.

114.

If the bond energies of H–H, Br – Br, and H –Br are 433, 192, and 364 kJ mol^–1 respectively, the ∆Hº for the reaction H₂(g) + Br₂(g) → 2HBr(g) will be:
1. +103 kJ
2. +261kJ
3. –103 kJ
4. –261 kJ

115.

Which of the following organic compounds has same hybridization as its combustion product –(CO₂)?
1. Ethane
2. Ethyne
3. Ethene
4. Ethanol

116.

Nitrogen form $N_2$, but phosphorous form $P_2$, it's at a time convert in $P_4$, reason is:
1. Triple bond present between phosphorous atoms.
2.$\mathrm{p}\mathrm{\pi }-p\mathrm{\pi }$bonding is weak in phosphorous.
3.$\mathrm{p}\mathrm{\pi }-p\mathrm{\pi }$bonding is strong in phosphorous.
4. Multiple bonds easily form phosphorous.

117. The behaviour of samarium (Z=62) is very much like europium (Z=63). Since both elements:

118.

Which one of the following statements about enzyme catalysis is incorrect?

119.

120.

Which of the following is not true about chloramphenicol?

121.

Pure water can be obtained from sea water by:
1. Centrifugation
2. Plasmolysis
3. Reverse osmosis
4. Sedimentation

122.

Polarisation of electrons in acrolein may be written as:
1.$\stackrel{+\delta }{C}{H}_2=CH-\stackrel{-\delta }{C}HO$
2.$\stackrel{-\delta }{C}{H}_2=CH-\stackrel{+\delta }{C}HO$
3.$\stackrel{-\delta }{C}{H}_2=CH-\stackrel{}{C}\stackrel{+\delta }{H}O$
4.$\stackrel{+\delta }{C}{H}_2=CH-CH\stackrel{-\delta }{O}$

123.

Which one of the following polymers is prepared by condensation polymerization?
1. Nylon-6, 6
2. Teflon
3. Rubber
4. Styrene

124.

Which chemical reaction leads to the formation of isocyanide?
1. Reimer Tiemann reaction.
2. Carbylamine reaction.
3. Hoffmann bromamide reaction.
4. None of the above.

125.

(a) H₂O₂+ O₃→H₂O + 2O₂
(b) H₂O₂+ Ag₂O→2Ag + H₂O + O₂
The role of hydrogen peroxide in the above reactions is respectively:

126.

Which of the following species is not stable?
1.${\left[{\mathrm{SiCl}}_6\right]}^{2-}$
2.${\left[{\mathrm{SiF}}_6\right]}^{2-}$
3.${\left[{\mathrm{GeCl}}_6\right]}^{2-}$
4.${\left[\mathrm{Sn}{\left(\mathrm{OH}\right)}_6\right]}^{2-}$

127. What is the correct order of electron gain enthalpy from least negative to most negative for the elements C, Ca, Al, F, and O?
1. Al < Ca < O < C < F
2. Al < O < C < Ca < F
3. C < F < O < Al < Ca
4. Ca < Al < C < O < F

128.

Clemmensen reduction reaction is:

1.
2.	\(C_6H_5-CO-CH_3 + NH_2NH_2 \xrightarrow{C_2H_5ONa}\\ C_6H_5CH_2CH_3\)
3.	\(CH_3COCH_3 + 4HI \xrightarrow{\text{Red. P}} CH_3CH_2CH_3\)
4.	All of the above

129.

Consider the reactions:

The mechanisms of reactions (i) and (ii) are, respectively:
1. S_N2 and S_N1
2. S_N1 and S_N2
3. S_N1 and S_N1
4. S_N2 and S_N2

130.

The following equilibria are given:

The equilibrium constant of the reaction
\(2NH_{3} \ + \ \frac{5}{2}O_{2} \ \rightleftharpoons \ 2NO \ + \ 3H_{2}O\)in terms of K₁, K₂and K₃is:
1. K₁.K₂.K₃
2.\(\mathrm{\frac{K_{1}K_{2}}{K_{3}}}\)
3.\(\mathrm{\frac{K_{1}K_{3}^{2}}{K_{3}}}\)
4.\(\mathrm{\frac{K_{2}K_{3}^{3}}{K_{1}}}\)

131.

In light of the above statements, choose the most appropriate answer from the options given below:

132.

A paramagnetic molecule among the following is:

133. Which complex among the following exhibits a paramagnetic nature?
1. [Co(NH₃)₆]³⁺
2. [Pt(en)Cl₂]
3. [CoBr₄]^2–
4. Mo(CO)₆
(At. No. Mo = 42, Pt = 78)

134. The reaction that does not take place in a blast furnace between 900 K to 1500 K temperature range during the extraction of iron is:
1. CaO + SiO₂→ CaSiO₃
2. Fe₂O₃+ CO→ 2FeO + CO₂
3. FeO + CO→ Fe +CO₂
4. C + CO₂→ 2CO

135.

Among the following alkaline earth metal halides, the one which is covalent and soluble in organic solvents is:
1. Magnesium chloride
2. Beryllium chloride
3. Calcium chloride
4. Strontium chloride

Chemistry - Section B

136.

Which of the following is the most correct electron displacement for a nucleophilic reaction to take place?

1.
2.
3.
4.

137.

Increasing order of bond length is:
1.$N{O}^{-}$$<$$NO$$<$$N{O}^{+}$$<$$O_2^{-}$
2.$O_2^{-}$$<$$NO$$<$$N{O}^{-}$$<$$N{O}^{+}$$$
3.$O_2^{-}$$<$$N{O}^{-}$$<$$NO<$$N{O}^{+}$$$
4.$N{O}^{+}$$<$$NO$$<$$N{O}^{-}$$<$$O_2^{-}$

138. Select the correct option based on statements below:

139. What fraction of Fe exists as Fe(III) in Fe_0.96O?
(Consider Fe_0.96 to be made up of Fe(II) and Fe(III) only)
1. \(\frac{1}{12}\)
2. \(0.08\)
3. \(\frac{1}{16}\)
4. \(\frac{1}{20}\)

140.

In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with?
1. Iron(II) sulphide
2.Carbon monoxide
3. Copper(I) sulphide
4.Sulphur dioxide

141.

A strong base can abstract an$\mathrm{\alpha }$-hydrogen from:
1. Alkene
2. Amine
3. Ketone
4. Alkane

142. The dissociation constant of a weak acid is\(1\times 10^{-4}\)in order to prepare a buffer solution with pH=5 the [salt]/ [Acid] ratio should be:
1. 4 : 5
2. 10 : 1
3. 5 : 4
4. 1 : 10

143.

Nylon is an example of:
1. Polysaccharide
2. Polyamide
3. Polythene
4. Polyester

144.

For irreversible expansion of an ideal gas under isothermal condition, the correct option is :
1.$∆\mathrm{U}=0,∆{\mathrm{S}}_{\mathrm{total}}\ne 0$
2. $∆\mathrm{U}\ne 0,∆{\mathrm{S}}_{\mathrm{total}}=0$
3.$∆\mathrm{U}=0,∆{\mathrm{S}}_{\mathrm{total}}=0$
4.$∆\mathrm{U}\ne 0,∆{\mathrm{S}}_{\mathrm{total}}\ne 0$

145. The product formed from the following reaction sequence is

1.		2.
3.		4.

146. Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):

In the light of the above statements choose the correct answer from the options given below:

147.

If the molality of the dilute solution is doubled, the value of molal depression constant (K_f) will be-
1. Halved
2. Tripled
3. Unchanged
4. Doubled

148.

If there is no rotation of plane-polarized light by a compound in a specific solvent
thought to be chiral, it may mean that:
1. The compound is certainly a chiral.
2. The compound is certainly meso.
3. There is no compound in the solvent.
4. The compound may be a racemic mixture.

149.

Artificial sweetener which is stable under cold conditions only is:
1. Saccharine
2. Sucralose
3. Aspartame
4. Alitame

150.

How many electrons can fit in the subshell for which n = 3 andl= 1?
1. 2
2. 6
3. 10
4. 14

Physics - Section A

151.

The half-life of a sample of a radioactive element containing 4 × 10¹⁶ active nuclei, is 10 days. The number of decayed nuclei after 30 days will be:
1.$0.5\times {10}^{16}$
2.$2\times {10}^{16}$
3.$3.5\times {10}^{16}$
4.$1\times {10}^{16}$

152. Select the correct option based on the statements:

153.

The given graph represents the \(\mathrm{V\text{-} I}\) characteristic for a semiconductor device.

Which of the following statement is correct?

154.

The dimensions of${\left({\mathrm{\mu }}_0{\mathrm{\epsilon }}_0\right)}^{-1/2}$are:
1.$\left[{\mathrm{L}}^{-1}\right]$$\mathrm{T}$
2.$\left[{\mathrm{LT}}^{-1}\right]$
3.$\left[{\mathrm{L}}^{-1/2}\right]$${\mathrm{T}}^{1/2}$
4.$\left[{\mathrm{L}}^{-1/2}\right]$${\mathrm{T}}^{-1/2}$

155.

A ball is dropped from a height of \(5~\text {m}.\)If it rebounds up to a height of \(1.8~\text {m},\)then the ratio of velocities of the ball after and before the rebound will be:
1.\(\dfrac{3}{5}\)
2.\(\dfrac{2}{5}\)
3.\(\dfrac{1}{5}\)
4.\(\dfrac{4}{5}\)

156. If \(\lambda_X,\lambda_I,\lambda_M\) and \(\lambda_\gamma\) are the wavelengths of \(X\)-rays, infrared rays, microwaves and \(\gamma\)-rays respectively, then:

157. A Carnot engine whose sink is at \(300~\text{K}\)has an efficiency of \(40\%.\)By how much should the temperature of the source be increased to increase its efficiency by \(50\%\)of its original efficiency?

158.

A body of mass \(m\) is attached to the lower end of a spring whose upper end is fixed. The spring has negligible mass. When the mass \(m\) is slightly pulled down and released, it oscillates with a time period of \(3~\text{s}\). When the mass \(m\) is increased by \(1~\text{kg}\), the time period of oscillations becomes \(5~\text{s}\). The value of \(m\) in \(\text{kg}\) is:
1.\(\frac{3}{4}\)
2.\(\frac{4}{3}\)
3.\(\frac{16}{9}\)
4.\(\frac{9}{16}\)

159.

The mean free path \(l\) for a gas molecule depends upon the diameter, \(d\) of the molecule as:

160.

If the velocity of a particle is \(v=At+Bt^{2},\) where \(A\) and \(B\) are constants, then the distance travelled by it between \(1~\text{s}\)and \(2~\text{s}\)is:

161.

A wire of length \(L,\)area of cross section \(A\) is hanging from a fixed support. The length of the wire changes to \({L}_1\)when mass \(M\) is suspended from its free end. The expression for Young's modulus is:

162.

A major breakthrough in the studies of cells came with the development of an electron microscope. This is because:

163.

164.

A \(220\) V input is supplied to a transformer. The output circuit draws a current of \(2.0\) A at \(440\) V. If the efficiency of the transformer is \(80\)%, the current drawn by the primary windings of the transformer is:
1. \(3.6\) A
2. \(2.8\) A
3. \(2.5\) A
4. \(5.0\) A

165. If a vector\((2\hat i +3\hat j+8\hat k)\) is perpendicular to the vector\((4\hat i-4\hat j+\alpha\hat k)\) then the value of\(\alpha\)is:
1.\(-1\)
2.\(\frac{-1}{2}\)
3.\(\frac{1}{2}\)
4.\(1\)

166.

If the focal length of the objective lens is increased then the magnifying power of:

167. In hydrogen spectrum, the shortest wavelength in the Balmer series is \(\lambda\). The shortest wavelength in the Bracket series is:
1.\(16\lambda\)
2.\(2\lambda\)
3.\(4\lambda\)
4.\(9\lambda\)

168.

An object kept in a large room having an air temperature of \(25^\circ \text{C}\)takes \(12\) minutes to cool from \(80^\circ \text{C}\) to \(70^\circ \text{C}.\) The time taken to cool for the same object from \(70^\circ \text{C}\) to \(60^\circ \text{C}\) would be nearly:
1. \(10\) min
2. \(12\) min
3. \(20\) min
4. \(15\) min

169.

The length of the string of a musical instrument is \(90\) cm and has a fundamental frequency of \(120\) Hz. Where should it be pressed to produce a fundamental frequency of \(180\) Hz?

170.

A bullet of mass \(2~\text {gm}\)has a charge of \(2~\mu\text{C}.\)Through what potential difference must it be accelerated, starting from rest, to acquire a speed of \(10~\text{m/s}?\)
1.\(50~\text {kV}\)
2.\(5~\text {V}\)
3.\(50~\text {V}\)
4.\(5~\text {kV}\)

171.

What is the flux through a cube of side \(a,\) if a point charge of \(q\) is placed at one of its corners?
1.\(\frac{2q}{\varepsilon_0}\)
2.\(\frac{q}{8\varepsilon_0}\)
3.\(\frac{q}{\varepsilon_0}\)
4.\(\frac{q}{2\varepsilon_0}\)

172. Two discs are rotating about theirrespective axes, which are normal to the discs and pass through their centres. Disc \(D_1\) has a\(2\) kg mass and \(0.2\) m radius and an initial angular velocity of \(50~\text{rad} ~\text{s}^{-1}.\) Disc \(D_2\) has a\(4\) kg mass, \(0.1\) m radius and an initial angular velocity of\(200~\text{rad} ~\text{s}^{-1}.\) The two discs are brought into contact face to face, with their axes of rotation coincident. The final angular velocity(in \(\text{rad} ~\text{s}^{-1}\)) of the combined system is:
1. \(60\)
2. \(100\)
3. \(120\)
4. \(40\)

173. The value of \(R\) for which power in it is maximum is:

1. \(3~\Omega\)
2. \(6~\Omega\)
3. \(12~\Omega\)
4. \(9~\Omega\)

174.

A geostationary satellite is orbiting the earth at a height of \(5R\) above the surface of the earth, \(R\) being the radius of the earth. The time period of another satellite in hours at a height of \(2R\) from the surface of the earth is:
1. \(5\)
2. \(10\)
3.\(6\sqrt2\)
4.\(\frac{6}{\sqrt{2}}\)

175.

A coil of resistance \(400~\Omega\)is placed in a magnetic field. The magnetic flux\(\phi~\text{(Wb)}\)linked with the coil varies with time \(t~\text{(s)}\)as\(\phi=50t^{2}+4.\)The current in the coil at \(t=2~\text{s}\)is:$$
1. \(0.5~\text{A}\)
2. \(0.1~\text{A}\)
3. \(2~\text{A}\)
4. \(1~\text{A}\)

176. The distance covered by a body of mass \(5\) g having linear momentum \(0.3\) kg-m/s in \(5\) s is:
1. \(300\) m
2. \(30\) m
3. \(3\) m
4. \(0.3\) m

177. The horizontal range and the maximum height of a projectile are equal. The angle of projection of the projectile is:
1.\(\theta = \tan^{-1}\left(\frac{1}{4}\right)\)
2.\(\theta = \tan^{-1}(4)\)
3.\(\theta = \tan^{-1}(2)\)
4.\(\theta = 45^{\circ}\)

178.

The heart of a man pumps \(5~\text{L}\) of blood through the arteries per minute at a pressure of \(150~\text{mm}\) of mercury. If the density of mercury is\(13.6\times10^{3}~\text{kg/m}^{3}\)$$$\mathrm{and}{\mathrm{}}^{}$\(g = 10~\text{m/s}^2,\)then the power of the heart in watts is:
1.\(1.70\)
2.\(2.35\)
3.\(3.0\)
4.\(1.50\)

179. A charged particle moves through a magnetic field in a direction perpendicular to it. Then:

180.

The half-life of a radioactive nucleus is 50 days. The time interval$(t_2-t_1)$between the time$t_2$when$\frac{2}{3}$of it has decayed and the time$t_1$when$\frac{1}{3}$of it had decayed is:
1. 50 days
2. 60 days
3. 15 days
4. 30 days

181.

A bar magnet of length \(l\) and magnetic dipole moment \(M\) is bent in the form of an arc as shown in the figure. The new magnetic dipole moment will be:

182.

Of the diodes shown in the following diagrams, which one of the diodes is reverse biased?

1.		2.
3.		4.

183. The unit of thermal conductivity is:

184.

A mass of \(0.5~\text{kg}\)moving with a speed of \(1.5~\text{m/s}\)on a horizontal smooth surface, collides with a nearly weightless spring with force constant \(k=50~\text{N/m}.\)The maximum compression of the spring would be:

1.\(0.12~\text{m}\)
2.\(1.5~\text{m}\)
3.\(0.5~\text{m}\)
4.\(0.15~\text{m}\)

185.

Which colour of the light has the longest wavelength?

Physics - Section B

186.

If identical charges \((-q)\) are placed at each corner of a cube of side \(b\) then the electrical potential energy of charge \((+q)\) which is placed at centre of the cube will be:

187. A parallel plate capacitor is charged by connecting it to a battery through a resistor. If \(i\) is the current in the circuit, then in the gap between the plates:

188.

A condenser of capacity C is charged to a potential difference of V₁. The plates of thecondenser are then connected to an ideal inductor of inductance L.The current through the inductor, when the potential difference across the condenser reduces to V₂ is:
1.$\frac{C\left(V_1^2-V_2^2\right)}{L}$
2.$\frac{C\left(V_1^2+V_2^2\right)}{L}$
3.${\left(\frac{C\left(V_1^2-V_2^2\right)}{L}\right)}^{1/2}$
4.${\left(\frac{C{\left(V_1-V_2\right)}^2}{L}\right)}^{1/2}$

189. In the above diagram, a strong bar magnet is moving towards solenoid-\(2\) from solenoid-\(1\). The direction of induced current in solenoid-\(1\) and that in solenoid-\(2\), respectively, are through the directions:

1. \(BA\) and \(CD\)
2. \(AB\) and \(CD\)
3. \(BA\) and \(DC\)
4. \(AB\)and \(DC\)

190.

Two radioactive nuclei P and Q, in a given sample decay into a stable nucleus R. At time t = 0, number of P species are 4${\mathrm{N}}_0$ and that of Q are ${\mathrm{N}}_0$. The half-life of P (for conversion to R) is 1 minute whereas that of Q is 2 minutes. Initially, there are no nuclei of R present in the sample. When the number of nuclei of P and Q are equal, the number of nuclei of R present in the samplewould be:
1.$2{\mathrm{N}}_0$
2.$3{\mathrm{N}}_0$
3.$\frac{9{\mathrm{N}}_0}{2}$
4.$\frac{5{\mathrm{N}}_0}{2}$

191.

A particle of mass M is situated at the centre of a spherical shell of the same mass and radius a. The gravitational potential at a point situated at a / 2 distance from the centre, will be:
1.$-\frac{3GM}{a}$
2.$-\frac{2GM}{a}$
3.$-\frac{GM}{a}$
4.$-\frac{4GM}{a}$

192.

The \((P\text{-}V)\) diagram for an ideal gas in a piston-cylinder assembly undergoing a thermodynamic process is shown in the figure. The process is:

193. A particle of mass \(m\)and charge \(q\)is placed in a uniform electric field \(E\)at \(t=0~\text s.\)The kinetic energy of the particle after time \(t\)is:
1. \(\dfrac{Eqm}{t}\)
2. \(\dfrac{E^2q^2t^2}{2m}\)
3. \(\dfrac{2E^2t^2}{qm}\)
4. \(\dfrac{Eq^2m}{2t^2}\)

194.

For the network shown in the figure below, the value of the current \(i\) is:

1.\(\frac{18V}{5}\)
2.\(\frac{5V}{9}\)
3.\(\frac{9V}{35}\)
4.\(\frac{5V}{18}\)

195.

The de-Broglie wavelength of the thermal electron at \(27^\circ \text{C}\) is \(\lambda.\) When the temperature is increased to \(927^\circ \text{C},\) its de-Broglie wavelength will become:
1.\(2\lambda\)
2.\(4\lambda\)
3.\(\frac\lambda2\)
4.\(\frac\lambda4\)

196.

The electron concentration in an \(\mathrm{n\text-}\)type semiconductor is the same as the hole concentration in a \(\mathrm{p\text{-}}\)type semiconductor. An external field (electric) is applied across each of them. Compare the currents in them.

197.

A ball is dropped from a high-rise platform at \(t=0\) starting from rest. After \(6\) seconds, another ball is thrown downwards from the same platform with speed \(v\). The two balls meet after \(18\) seconds. What is the value of \(v\)?

198.

A car of mass m starts from rest and accelerates so that the instantaneous power delivered to the car has a constant magnitude \(P_0\). The instantaneous velocity of this car is proportional to:
1.\(t^{\frac{1}{2}}\)
2.\(t^{\frac{-1}{2}}\)
3.\(\frac{t}{\sqrt{m}}\)
4.\(t^2 P_0\)

199. Young’s double-slit experiment is first performed in air and then in a medium other than air. It is found that the \(8^\mathrm{th}\)bright fringe in the medium lies where the \(5^\mathrm{th}\)dark fringe lies in the air. The refractive index of the medium is nearly:
1.\(1.59\)
2.\(1.69\)
3.\(1.78\)
4.\(1.25\)

200.

The amount of heat energy required to raise the temperature of \(1\) g of Helium at NTP, from \({T_1}\)K to \({T_2}\)K is:
1.\(\frac{3}{2}N_ak_B(T_2-T_1)\)
2.\(\frac{3}{4}N_ak_B(T_2-T_1)\)
3.\(\frac{3}{4}N_ak_B\frac{T_2}{T_1}\)
4.\(\frac{3}{8}N_ak_B(T_2-T_1)\)

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