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NEET (UG) Undergraduate Previous Year Question Papers 2019
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Q. 1 Oxygen is NOT produced during photosynthesis by
- (A) Nostoc
- (B) Cycas
- (C) Green sulphur becteria
- (D) Chara
Q.2 Which one of the following plants shows a very close relationship with a species of month, where none of the two can complete its life cycle without the other?
- (A) Yucca
- (B) Banana
- (C) Hydrilla
- (D) Viola
Q.3 The bond dissociation energies of X2, Y2 and XY are in the ratio of 1 : 0.5 : 1 ΔH for the formation of XY is – 200 kJ mol–1. The bond dissociation energy of X2 will be
- (A) 400 kJ mol–1
- (B) 200 kJ mol–1
- (C) 800 kJ mol–1
- (D) 100 kJ mol–1
Q. 4 When initial concentration of the reactant is double, the half-life period of a zero order reaction
- (A) remains unchanged
- (B) is halved
- (C) is tripled
- (D) is doubled
Q.5 Which of the following statements is NOT true for halogens?
- (A) All form monobasic oxyacids.
- (B) Chlorine has the highest electrical-gain enthalpy.
- (C) All but fluorine show positive oxidation states.
- (D) All are oxidizing agents.
Q. 6 The compound A on treatment with Na gives B, and with PCl5 gives C. B and C react together to give diethyl ether. A, B and C are in the order
- (A) C2H5OH, C2H6, C2H6Cl
- (B) C2H5OH, C2H5ONa, C2H5Cl
- (C) C2H5OH, C2H6, C2H5OH
- (D) C2H5OH, C2H6Cl, C2H5ONa
Q. 7 The ratio of kinetic energy to the total energy of an electron a Bohr orbit of the hydrogen atom, is
- (A) 2 : – 1
- (B) 1 : 1
- (C) 1 : – 2
- (D) 1 : – 1
Q.8 Which of the following hormones can play a significant role in osteoporosis?
- (A) Estrogen and Parathyroid hormone
- (B) Aldosterone and Prolactin
- (C) Parathyroid hormone and Prolactin
- (D) Progesterone and Aldosterone
Q. 9 The experimental proof for semi conservative replication of DNA was first shown in a
- (A) Plant
- (B) Virus
- (C) Bacterium
- (D) Fungus
Q. 10 Which of the following flowers only once in its life-time?
- (A) Mango
- (B) Papaya
- (C) Jackfruit
- (D) Bamboo species
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