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Class:-XII PCM/B Time:-90 min
1. The Students who are appearing for IIT should attempt Physics, Chemistry and Maths and those for NEET should attempt Physics, Chemistry and Biology.
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1
A
B
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D
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2. A wire of mass 10 gram, radius 1 mm in composed to its length by 10%. The percentage change in resistance is –
a) 15%
b) 16%
c) 18%
d) 19%
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3. Two wires A and B of the same material have their length in ratio 5:3 and diameter in the ratio 2:3. If the resistance of wire A is 15 ohm. What is the resistance of wire B is –
a) 1
b) 2
c) 3
d) 4
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4. What is he colour of third band of a coded resistor of resistance 0.34
a) Green
b) Yellow
c) Gold
d) Silver
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5
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B
C
D
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9. A resistance coil is made by joining in parallel two resistance each of 10. An emf. of 1.0V is applied between two ends of the coil for 5 minute. What is the heat produced in calories.
a) 12.2
b) 13.2
c) 14.3
d) 15.1
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10
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B
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D
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11.
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12
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D
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13. If two bulbs of wattage 25 w and 100w respectively each rated at 220 v connected in series with the supply of 440 V. Which bulb will fuse -
a) 25 w
b) 100 w
c) both of them
d) none
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B
C
D
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B
C
D
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19. A long straight wire of radius ‘a’ carries a steady current i. The current is uniformly distributed across its cross section. The ratio of the magnetic field at a/2 and 2a is
a) 1/2
b) 1/4
c) 4
d) 1
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20
A
B
C
D
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21. A proton of - particles moving with same velocity enter into a uniform magnetic field acting normal to the plane of their motion. The ratio of radii of the circular paths described by the proton and particles is -
a) 1:2
b) 1:4
c) 1:6
d) 4:1
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22. A short bar magnet of magnetic moment 0.4 J/T is placed in a uniform magnetic field of 0.16 T. The magnet is in stable equilibrium when the potential energy is -
a) -0.064 J
b) zero
c) – 0.082 J
d) 0.064 J
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23. A magnetic needle suspended parallel to magnetic field requires √3 j of work to turn it through 60°. The torque needed to maintain the needle in this position will be -
a) 2 J
b) 3 J
c) J
d) 3/2 J
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24. The magnetic field due to a current carrying circular loop of radius 3 cm at a point on the axis at a distance of 4 cm from the centre of 54 . What will be its value at the centre of loop -
a) 250
b) 150
c) 125
d) 75
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25.
A
B
C
D
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26.A 10N solution stand for
(a)Normal Solution
(b)Decanormal Solution
(c)Decinormal Solution
(d)Seminormal Solution
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27. 1 equivalent means
(a)1000 milliequivalent
(b)1000 gm of the Compound
(c)Equivalent wt in gm
(d)Equivalent wt. in mg
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28. In which mode of expression, the concentration of solution remains independent of temperature?
(a)Molarity
(b)Normality
(c)Formality
(d)Molality
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29. Molarity is expressed as
(a)Grams/litre
(b)Litres/mole
(c)Moles/Litre
(d)Moles/1000 gm
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30. A molal solution is one that contains one mole of a solute in
(a)1000g of the solvent
(b)One litre of the solvent
(c)One litre of the solution
(d)22.4 litres of the solution
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31. Sum of mole fractions of the two components of a binary solution is always
(a)More than one
(b)Less than one
(c)Exactly one
(d)Not fixed
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32. The most convenient way of expressing concentration is
(a)Normality
(b)Molarity
(c)Molality
(d)Mole fraction
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33. Molality is the most convenient unit for expressing concentration because it
(a)Is very difficult to find out
(b)Involves difficult calculation
(c)Involves the measurement of weights of liquids
(d)Has no unit
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34. A solution contains 1 mole of alcohol and 4 mole of water. The mole fraction of water and alcohol will be
(a)1/4 and 4/1
(b)4/1 and 1/4
(c)1/5 and 4/5
(d)4/5 and 1/5
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35
(a)0.1
(b)0.2
(c)0.5
(d)0.7
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36. 1.0 gm of pure calcium carbonate was found to require 50ml of dilute HCL for complete reaction. The strength of the HCL for complete reaction. The strength of the HCL solution is given by
(a)4N
(b)2N
(c)0.4N
(d)0.2 N
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37. The normality of 10% (weight/volume) acetic acid is
(a)1N
(b)10N
(c)1.7N
(d)0.83N
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38. If 250 ml of 0.25M NaCl solution is diluted with water to a volume of 500ml, the new concentration of the solution is
(a)0.167 M
(b)0.125 M
(c)0.0833 M
(d)0.0167M
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39. The volume of 0.2N base required to completely react with 0.5 litre of 0.1N acid is
(a)1.00 L
(b)0.10 L
(c)0.25 L
(d)0.01 L
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40. 30ml of solution is neutralized by 15ml of 0.2N base. The strength of the acid solution is
(a)0.1N
(b)0.15N
(c)0.3N
(d)0.4N
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41.
(a)25ml
(b)50ml
(c)75ml
(d)100ml
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42
(a)2.45g
(b)3.92g
(c)4.90g
(d)9.8g
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43
(a)20ml
(b)25ml
(c)40ml
(d)50ml
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44. Which of the following should be done in order to prepare 0.40 M NaCl starting with 100ml 0.30 M NaCl (mol wt of NaCl=58.5)
(a)Add 5.85 g NaCl
(b)Add 20 ml water
(c)Add 0.010 mole NaCl
(d)Evaporate 10 ml water
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45
(a)
(b)
(c)
(d)
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46
(a)10
(b)20
(c)2.5
(d)5
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47. An aqueous solution of glucose is 10% in strength. The volume in which 1 gm mole of it is dissolved will be
(a)18 litres
(b)9 litres
(c)0.9 litres
(d)1.8 litres
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48. A 500g tooth paste sample has 0.2g flueride concentration. What is the concentration of F in terms of ppm level?
(a)250
(b)200
(c)400
(d)1000
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49. Increasing the temperature of an aqueous solution will cause
(a)Decrease in molality
(b)Decrease in molarity
(c)Decrease in mole fraction
(d)Decrease in % w/w
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50. The molarity of a solution prepared by adding 7.1g of Na2SO4 (formula weight 142 amu) to enough water to make 100ml volume is
(a)2.0M
(b)1.0M
(c)0.5M
0.05M
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69
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70
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74
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75
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76.
Test cross is crossing between
a) Genotype with dominant trait.
b) b) Genotype with recessive trait.
c) F1 hybrid with double recessive trait.
d) two F1 hybrids.
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77.
Hybrid gametes are never produced. This indicates
a) Law of dominance.
b) Law of segregation.
c) Law of independent assortment.
d) None of these.
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78.
When two genes are very closely placed then it will show
a) very close crossing-over.
b) double crossing-over.
c) very high crossing-over.
d) no crossing-over.
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79.
a )
b)
c)
d)
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80. When both alleles express their effect on being present together, the phenomenon is known as
a) dominance.
b) co- dominance.
c) incomplete dominance.
d) None of these
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81. Starch synthesis in pea seeds is controlled by a single gene pair, i.e., BB and produces large starch grains. But in heterozygous condition, Bb, the starch grains will be
a)small
b) large
c) intermediate.
d) None of these
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82 . Gain or loss of chromosome is known as
a) polyploidy.
b) aneuploidy.
c) monoploidy.
d) diploidy.
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83. Turner’s syndrome is represented by
a) XXY.
b) XO
c) 2n + 1.
d) 2 + 2
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84 . DNA Polymerase that helps in DNA replication is of
a) Two types.
b) three types.
c) four types.
d) only one type.
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85.
During protein synthesis in an organism at one point the process come to a halt. Select the group of the three codons from the following , from which any one of the three could bring about this halt.
a) UUU, UUCC, UAU
b) UUC, UUA, UAC
c) UAG, UGA, UAA
d) UUG, UCA, UCG
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86.
During splicing , the exons are joined and the enzyme which catalyses this reaction is
a) RNA ligase.
b) RNA catalase.
c) RNA permease.
d) RNA polymerase.
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87.
Out of the total 64 codons,61 codons code for 20 amino acids, this suggests
a) Degeneracy of codons .
b) overlapping of codons.
c) redundancy of codos.
d) ambiguous nature of codons.
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88.
Which enzyme creates nick and reseal it during DNA replication?
a) DNA ligase
b) Reverse transcriptase
c) DNA polymerase
d) Topoisomerase
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89.
UTRs are needed for
a) transcription.
b) replication of DNA.
c) translation.
d) None of these.
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90.
Jumping genes are also called as
a) Complementary genes.
b) transposes.
c) transformation.
d) transduction.
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91 . Molecular scissors are
a) DNA ligaes.
b) exonuclease.
c) restriction endonuclease.
d) reverse transcriptase.
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92 . Protein synthesis in an animal cell takes place
a) only in cytoplasm.
b) in both, nucleus and cytoplasm.
c) in both, cytoplasm and mitochondria.
d) only in ribosomes.
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93 .The genetic material of retrovirus is.
a) RNA.
b) DNA.
c) mRNA.
d) cDNA.
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94 . The sequence of genes in lac operon is
a) I, o, z, y, a, p.
b) p, i, o, z, y, a.
c) i, p, o, y, a,
d) i, p, o, z, y, a.
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95 . Which one of the following is not true for antibiotics?
i. First antibiotic was discoursed by Alexander Fleming?
ii. The term antibiotic was coined by Waksman in 1942.
iii. Some person can be allergic to a particular antibiotic.
iv. Each antibiotic is effective only against one particular kind of germ.
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96 . Bacillus thuringiensis (Bt) strain have been used for designing novel
a) biofertilisers.
b)bio- metallurgical technique.
c) bio-mineralisation processes.
d) bioinsecticidal plants
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97 . Which one of the following microorganisms is used for production of citric acid is industries?
a) Lactobacillus bulgaricus
b) penicillium citrinum.
c) Aspergillus niger
d) Rhizopus nigricans
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98 . Formation of vinegar from alcohol is brought by
a) Bacillus subtilis.
b) Clostridium.
c) Acetobacter aceti.
d) Azotobacter.
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99 . Wine and beer are produced directly by fermentation. In preparation of brandy and whisky, both fermentation and distillation processes are required. It is because
a) fermentation is inhibited at an alcohol level of 10-18%.
b) distillation prolongs storage.
c) distillation improves quality.
d) distillation purifies the beverage.
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100 . Which group of organisms are considered as biopesticides?
a) viruses, bacteria and algae.
b) fungi, bacteria, and viruses.
c) viruses, bacteria, algae and fungi.
d) viruses, bacteria. Fungi, protozoa and mites.
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