Question 1

**Which of the following is not a fat soluble vitamin ?**

.

Correct answer is : 1

Solution :

Vitamin B complex is fat insoluble

Question 2

**Which of the statements about "Denaturation" given below are correct ?**

(a) Denaturation of proteins causes loss of secondary and tertiary structures of the protein.

(b) Denturation leads to the conversion of double strand of DNA into single strand

(c) Denaturation affects primary strucrture which gets distorted

**Statements:**(a) Denaturation of proteins causes loss of secondary and tertiary structures of the protein.

(b) Denturation leads to the conversion of double strand of DNA into single strand

(c) Denaturation affects primary strucrture which gets distorted

.

Correct answer is : 3

Solution :

During denaturation secondary and tertiary structures of protein destroyed but primary structures remains intact.

Question 3

**Which has the maximum number of molecules among the following ?**

.

Correct answer is : 3

Solution :

Moles of 1: 44/44 =1 →so number of molecules = N

_{a}

Moles of 2: 48/48 =1 →so number of molecules = N

_{a}

Moles of 3: 8/2=4 →so number of molecules = 4N

_{a}Moles of 4: 64/64 =1 →so number of molecules = N

_{a}

Question 4

**The half life of a substance in a certain eznzyme-catalysed reaction is 138 s. The time required for the concentration of the substance to fall from 1.28 mg L**

^{-1}to 0.04 mg L^{-1},is:.

Correct answer is : 3

Solution :

Enzyme catalysed reactions are initially follow first order kinetics when concentration decreases 1.28 mg L

^{-1}to 0.04 mg L

^{-1}.Then five half life completed

No. of half lives = 5

So, times required = 5 × 138 = 690 s

Question 5

**Which of the following compounds undergoes nucleophilic substitution reaction most easily ?**

.

Correct answer is : 1

Solution :

The correct order of nucleophilic substitution reactions

A>D>B>C

Question 6

**Which of the following statements is incorrect ?**

.

Correct answer is : 3

Question 7

**A 0.1 molal aqueous solution of a weak acid is 30% ionized. If K**

_{f}for water is 1.86°C/m, the freezing point of the solution will be :.

Correct answer is : 4

Solution :

ΔT

_{f}= iK

_{f}m

HA → H

^{+}+ AH

^{-}

1-α → α α

1-0.3 → 0.3 0.3

i = 1 - 0.3 + 0.3 + 0.3

i = 1.3

ΔT

_{f}= 1.3 *1.86 *0.1 = 0.2418

T

_{f}= 0 - 0.2418 = -0.2418°C

Question 8

**The rate of the reaction 2N**

-d[N

d[NO

d[O

The relationship between k and k' and between k and k" are :

_{2}O_{5}→ 4NO_{2}+ O_{2}can be written in three ways :-d[N

_{2}O_{5}]/dt = k[N_{2}O_{5}]d[NO

_{2}]/dt = k'[N_{2}O_{5}]d[O

_{2}]/dt = k"[N_{2}O_{5}]The relationship between k and k' and between k and k" are :

.

Correct answer is : 2

Solution :

-1/2 d[N

_{2}O

_{5}]/dt = 1/4 d[NO

_{2}]/dt = d[O

_{2}]/dt

1/2 k[N

_{2}O

_{5}] = 1/4 k'[N

_{2}O

_{5}] = k"[N

_{2}O

_{5}]

Question 9

**Which of the following carbonyls will have the strongest C-O bond ?**

.

Correct answer is : 1

Solution :

As + ve charge on the central metal atom increases, the less readily the metal can donate electron density into the π* orbitals of CO ligand to weaken the C-O bond. Hence the C-O bond would be strongest in Mn(CO)

_{6}

^{+}

Question 10

**The order of reactivity of phenyl magnesium bromide (PhMgBr) with the following compounds :**

.

Correct answer is : 4

Solution :

4 due to steric crowding

Question 11

**The IUPAC name of the following compound**

.

Correct answer is : 1

Question 12

**According to the Bohr Theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon ?**

.

Correct answer is : 3

Solution :

Energy of photon obtained from the transition n = 6 to n = 5 will have least energy.

ΔE = 13.6Z

^{2}(1/n

_{1}

^{2}- 1/n

_{2}

^{2})

Question 13

**A solid compound XY has NaCl structure. If the radius of the cation is 100 pm, the radius of the anion (Y**

^{-}) will be :.

Correct answer is : 3

Solution :

Radius ratio of NaCl like crystal = r

^{+}/ r

^{-}= 0.414

r

^{-}= 100 / 0.414 =241.5

Question 14

**Consider the following processes and their ΔH((kJ/mol) :**

1/2 A → B (+150)

3B → 2C + D -(125)

E + A → 2D (+350)

For B + D → E + 2C, ΔH will be

1/2 A → B (+150)

3B → 2C + D -(125)

E + A → 2D (+350)

For B + D → E + 2C, ΔH will be

.

Correct answer is : 2

Solution :

by doing 2*eq(1) + eq(2) - eq(3) we will get the asked equation

ΔH = 300 -125 -350 =-175

Question 15

**Match the compounds given in List-I with List-II and select the suitable option using the code given below :**

a,b,c and d are

List1 | List2 |

a)Benzaldehyde | i)Phenolphthalein |

b)Phthalic anhydride | ii)Benzoin condensation |

c)Phenyl benzoate | iii)Oil of wintergreen |

d)Methyl salicylate | (iv) Fries rearrangement |

a,b,c and d are

.

Correct answer is : 4

Question 16

**Which of the following compounds is most basic ?**

.

Correct answer is : 2

Solution :

In benzylamine, the lone pair on nitrogen is not delocalized with the benzene ring.

Question 17

**Which of the following structures is the most preferred and hence of lowest energy for SO**

_{3}?.

Correct answer is : 4

Solution :

Formal charges help in the selection of the lowest energy structure from a number of possible Lewis structures for a given species. Generally the lowest energy structure is the one with the smallest formal charges on the atoms.

Question 18

**A solution contains Fe**

^{2+}, Fe^{3+}and I^{-}ions. This solution was treated with iodine at 35°C. E° for Fe^{3+}/Fe^{2+}is + 0.77 V and E° for I_{2}/2I^{-}= 0.536 V. The favourable redox reaction is.

Correct answer is : 3

Solution :

Since the reduction potential of Fe

^{3+}/Fe

^{2+}is greater than that of I

_{2}/2I

^{-}, Fe

^{3+}will be reduced and I

^{-}will be oxidized

Question 19

**What is the value of electron gain enthalpy of Na**

^{+}if IE_{1}of Na = 5.1 eV ?.

Correct answer is : 1

Solution :

Electron gain enthalpy is the ΔH for the process

Na

^{+}+ e

^{-}→ Na

ΔH = -5.1eV

Question 20

**The unit of rate constant for a zero order reaction is :**

.

Correct answer is : 1

Question 21

**In qualitative analysis, the metals of Group I can be separated from other ions by precipitating them as chloride slats. A solution initially contains Ag**

(K

^{+}and Pb^{2+}at a concentration of 0.10 M. Aqueous HCl is added to this solution until the Cl^{-}concentration is 0.10 M. What will be concentrations of Ag^{+}and Pb^{2+}be at equilibrium?(K

_{sp}for AgCl = 1.8 * 10^{-10}, K_{sp}for PbCl_{2}= 1.7 * 10^{–5}).

Correct answer is : 3

Solution :

[Ag

^{+}] = 1.8 * 10

^{-10}/0.1

[Pb

^{2+}] = 1.7 * 10

^{-5}/ (0.1)

^{2}

Question 22

**A bubble of air is underwater at temperature 15°C and the pressure 1.5 bar. If the bubble rises to the surface where the temperature is 25°C and the pressure is 1.0 bar, what will happen to the volume of the bubble?**

.

Correct answer is : 1

Solution :

V ∝ T/P

V

_{2}∝ 298

V

_{1}∝ 288/1.5

V

_{2}/V

_{1}= 1.55

Question 23

**Match List-I with List-II for the compositions of substances and select the correct answer using the code given below the lists :**

CaSO

CaSO

_{4}.1/2H_{2}OSubstances | Composition |

a)Palster of paris | i)CaSO_{4}.2H_{2}O |

b)Epsomite | ii) |

c)kieserite | iii)MaSO_{4}.7H_{2}O |

d)Gypsum | (iv)MaSO_{4}.H_{2}O |

(v)CaSO_{4} |

.

Correct answer is : 2

Question 24

**The pairs of species of oxygen and their magnetic behaviours are noted below. Which of the following presents the correct description ?**

.

Correct answer is : 3

Solution :

they contain one and two unpaired electrons each.

Question 25

**Consider the reactions :**

The mechanisms of reactions (i) and (ii) are respectively :

The mechanisms of reactions (i) and (ii) are respectively :

.

Correct answer is : 1

Solution :

Rearrangements do not occur in the given substitution reactions. So carbocation intermediates are not involved. Hence the mechanism is SN

_{2}in both cases.

Question 26

**Which of the following complex compounds will exhibit highest paramagnetic behaviour ?**

(At. No. Ti 22, Cr = 24, Co = 27, Zn = 30)

(At. No. Ti 22, Cr = 24, Co = 27, Zn = 30)

.

Correct answer is : 2

Solution :

[Cr(NH

_{3})

_{6}]

^{3+}contain three unpaired electrons.

Question 27

**200mL of an aqueous solution of a protein contains its 1.26 g. The Osmotic pressure of this solution at 300K is found to be 2.57 * 10**

^{-?3}bar. The molar mass of protein will be (R = 0.083 L bar mol?^{-?1}K^{-?1}) :.

Correct answer is : 4

Solution :

πv=nST

M = W*S*T/π*v

Question 28

**Which of the following oxide is amphoteric ?**

.

Correct answer is : 1

Solution :

because it reacts with acids as well as bases to form corresponding salts.

Question 29

**The following reactions take place in the blast furnace in the preparation of impure iron. Identify the reaction pertaining to the formation of the slag.**

.

Correct answer is : 3

Solution :

Slag can be defined as a fusiblemass, which is obtained when a flux reacts with an infusible acidic or basic impurity present in the oxide ore.

CaO(s) (basic flux) + SiO

_{2}(s) (acidic flux) → CaSiO

_{3}(s) (slag)

Question 30

**An organic compound ?'A'? on treatment with NH**

_{3}gives ?'B'? which on heating gives ?'C?', ?'C?' when treated with Br_{2}in the presence of KOH produces ethylamine. Compound ?'A'? is :.

Correct answer is : 4

Question 31

**The technique called gamete intrafallopian transfer (GIFT) is recommended for those females:**

.

Correct answer is : 1

Question 32

**Which one of the following is a possibility for most of us in regard to breathing, by making a conscious effort?**

.

Correct answer is : 2

Solution :

Eustachian tube connect middle ear cavity (Tympanic cavity) with pharynx

Question 33

**Bacillus thuringiensis forms protein crystals which contain insecticidal protein**

.

Correct answer is : 1

Question 34

**Which one of the following pairs is wrongly matched while the remaining three are correct?**

.

Correct answer is : 2

Solution :

Water hyacinth is offset.

Question 35

**Which one of the following diagrams represents the placentation in Dianthus?**

.

Correct answer is : 2

Solution :

Free central placentation occurs in Dianthus

Question 36

**Which one of the following statements is totally wrong about the occurrence of notochord, while the other three are correct?**

.

Correct answer is : 3

Solution :

Because get changed or replaced by vertibral column

Question 37

**Which one of the following animals may occupy more than one trophic levels in the same ecosystem at the same time?**

.

Correct answer is : 1

Solution :

It feeds upon grains hence called primary consumer and also insects hence called secondary consumer

Question 38

**Both, hydrarch and xerarch successions lead to:**

.

Correct answer is : 1

Question 39

**What happens during fertilisation in humans after many sperms reach close to the ovum?**

.

Correct answer is : 1

Question 40

**About which day in a normal human menstrual cycle does rapid secretion of LH (Popularly called LH-surge) normally occurs?**

.

Correct answer is : 1

Question 41

**About which day in a normal human menstrual cycle does rapid secretion of LH (Popularly called LH-surge) normally occurs?**

.

Correct answer is : 1

Question 42

**About which day in a normal human menstrual cycle does rapid secretion of LH (Popularly called LH-surge) normally occurs?**

.

Correct answer is : 1

Question 43

**The cells lining the blood vessels belong to the category of:**

.

Correct answer is : 2

Solution :

Inner most lining of Blood vessels in endothelium and is a type of squamous epithelia.

Question 44

**The pathogen Microsporum responsible for ringworm disease in humans belongs to the same Kingdom of organisms as that of:**

.

Correct answer is : 3

Solution :

Micorosporum is a member of Deuteromycetes of fungi & Rizopus is also fungi and member of Zygomycetes.

Question 45

**The figure below shows the structure of a mitochondrion with its four parts labelled (A), (B), (C) and (D). Select the part correctly matched with its function.**

.

Correct answer is : 2

Question 46

**Read the following statement having two blanks (A and B):**

?A drug used for --------(A)-------- patients is obtained from a species of the organism --------(B)--------.? The one correct option for the two blanks is:

?A drug used for --------(A)-------- patients is obtained from a species of the organism --------(B)--------.? The one correct option for the two blanks is:

.

Correct answer is : 2

Solution :

CyclosporinA is immunosuppressive drug obtained from Trichoderma and use in organ transplantation

Question 47

**Silencing of mRNA has been used in producing transgenic plants resistant to:**

.

Correct answer is : 2

Solution :

It occur through RNA i

Question 48

**At metaphase, chromosomes are attached to the spindle fibres by their:**

.

Correct answer is : 3

Question 49

**Consider the following statements (A-D) about organic farming:**

(A) Utilizes genetically modified crops like Bt cotton

(B) Uses only naturally produced inputs like compost

(C) Does not use pesticides and urea

(D) Produces vegetables rich in vitamins and minerals

Which of the above statements are correct?

(A) Utilizes genetically modified crops like Bt cotton

(B) Uses only naturally produced inputs like compost

(C) Does not use pesticides and urea

(D) Produces vegetables rich in vitamins and minerals

Which of the above statements are correct?

.

Correct answer is : 3

Question 50

**One of the constituents of the pancreatic juice while poured into the duodenum in humans, is:**

.

Correct answer is : 1

Solution :

Because it is inactive form and we know that all enzymes of pancrease secreted in this form

Question 51

**Frogs differ from humans in possessing:**

.

Correct answer is : 3

Solution :

Human possesses enucleated RBC inmature state

Question 52

**Which one of the following option gives the correct matching of a disease with its causative organism andmode mode of infection.**

Answer Discuss it!

.

Correct answer is : 2

Answer Discuss it!

.

Correct answer is : 3

Solution :

It is a defination of test cross

Answer Discuss it!

.

Correct answer is : 2

Solution :

Open means presence of cambium during sec. growth. Vascular cambium divides to form secondary xylem towards Inner side while sec. Phloem towards outside

Answer Discuss it!

.

Correct answer is : 3

Answer Discuss it!

.

Correct answer is : 2

Answer Discuss it!

.

Correct answer is : 4

Solution :

Whorled phyllotaxy is feature of Nerium and Alstonia. In Alstonia five leaves present in a whorl while in Nerium three leaves present in a whorl

Answer Discuss it!

.

Correct answer is : 4

Solution :

Sweet potato and turnip both are roots

Answer Discuss it!

.

Correct answer is : 4

Answer Discuss it!

.

Correct answer is : 2

Solution :

(A) Sporophyte is more developed in mosses rather than liver wort.

(B) Pinus is Monoecious in which male & female cones are borne on different branch.

Answer Discuss it!

.

Correct answer is : 1

Solution :

(A) Dry skin cause ceased cutaneous respiration

(B) Three chembered heart.

(C) Frog never be uricotalic

(D) External fertilization and in water

Answer Discuss it!

.

Correct answer is : 2

Answer Discuss it!

.

Correct answer is : 3

Solution :

Peak P-causes diastolic phase in ventricle while R-Peak causes systole in ventricle means diastolic and systolic phases represented by P & R and same Diastolic and systolic B.P.

Answer Discuss it!

.

Correct answer is : 1

Solution :

Clitellum - secretes cocoon during breading season of earthworm. Gizzard -grinding of food particles. setae help in locomotion. Typhlosole increases the absorption area in intestine

Answer Discuss it!

.

Correct answer is : 4

Answer Discuss it!

.

Correct answer is : 1

Solution :

70% to 75% CO

Answer Discuss it!

.

Correct answer is : 1

Solution :

During megagametogenesis functional megaspore (mostly chalazal) gives rise to embryo sac

Answer Discuss it!

.

Correct answer is : 4

Answer Discuss it!

.

Correct answer is : 4

Solution :

The progeny are genetically similar to parent and called clone

Answer Discuss it!

.

Correct answer is : 4

Solution :

The progeny are genetically similar to parent and called clone

Answer Discuss it!

.

Correct answer is : 3

Solution :

Cadmium is not essential element for plants

Answer Discuss it!

.

Correct answer is : 2

Answer Discuss it!

.

Correct answer is : 2

Solution :

Except peroxisome the remaining three and ER are the parts of Endomembrane system.

Answer Discuss it!

.

Correct answer is : 3

Answer Discuss it!

.

Correct answer is : 1

Solution :

B = µI/2R

I = q/T=qf

B = µ

Answer Discuss it!

.

Correct answer is : 4

Solution :

From Annaelida to chordata all are Eucoelomate C-Mollusca (Octopus), D-Arthropoda (Scorpion)

Answer Discuss it!

.

Correct answer is : 3

Answer Discuss it!

.

Correct answer is : 1

Answer Discuss it!

.

Correct answer is : 1

Answer Discuss it!

.

Correct answer is : 1

Answer Discuss it!

.

Correct answer is : 4

Answer Discuss it!

.

Correct answer is : 3

Solution :

Thigh muscles are skeletal muscle that are striated and voluntary.

Answer Discuss it!

.

Correct answer is : 4

Solution :

n

n

n

n

Trivalent impurity

→p type semiconductor

Answer Discuss it!

.

Correct answer is : 4

Solution :

Transgenic Rosie is actually cow Restriction enzymes cut the DNA at specific site The separation of DNA is performed by Gel electrophorasis

Answer Discuss it!

.

Correct answer is : 4

Solution :

Responsible for circadian cycle

Answer Discuss it!

.

Correct answer is : 4

Solution :

Guttation is due to root pressure.

Answer Discuss it!

.

Correct answer is : 1

Answer Discuss it!

.

Correct answer is : 2

Solution :

Glenoid cavity found in pectoral girdle

Answer Discuss it!

.

Correct answer is : 3

Answer Discuss it!

.

Correct answer is : 3

Answer Discuss it!

.

Correct answer is : 3

Solution :

Clostridium butylicum form butyric acid

Answer Discuss it!

.

Correct answer is : 2

Answer Discuss it!

.

Correct answer is : 1

Solution :

1/2l * √(F/µ) = f (for fundamentalmode)

l and µ are constant

Taking ln on both side & differentiating

= dF/2F = df/f

= dF/F = 2*df/f

=2 * 6/600 = 0.02

Answer Discuss it!

.

Correct answer is : 2

Solution :

Only in (a) and (c),

Diodes are forward biased

As p?type should be higher potential & n?type at lower potential.

Answer Discuss it!

.

Correct answer is : 1

Solution :

KE = hv - hv0 = h/e * (8.2 * 10

Answer Discuss it!

.

Correct answer is : 3

Solution :

G = GS/(S+G) + S'

G- GS/(S+G) = S'

S' = G

Answer Discuss it!

.

Correct answer is : 4

Solution :

F

Answer Discuss it!

.

Correct answer is : 4

Solution :

1 division = 1µA

current for 1°C = 40µ/10 = 4µA

1µA = 1/4 °C = 0.25°C

Answer Discuss it!

.

Correct answer is : 2

Answer Discuss it!

.

Correct answer is : 1

Solution :

R = 30 Ω

X

f = 50 Hz

X

Z = √(R

I

Answer Discuss it!

.

Correct answer is : 1

Solution :

GM = gR

=V

=√(2GM/R

=√(2GM/R)

Answer Discuss it!

.

Correct answer is : 4

Solution :

Voltage across zener diode is constant

(i)

(i)

(i)

Answer Discuss it!

.

Correct answer is : 2

Solution :

V

Answer Discuss it!

.

Correct answer is : 4

Answer Discuss it!

.

Correct answer is : 1

Solution :

For stable equilibrium U =-?MB

=-(0.4) (0.16)

= ?-0.064 J

Answer Discuss it!

.

Correct answer is : 2

Solution :

Deviation = zero

So, δ = δ

( µ

A

A

Answer Discuss it!

.

Correct answer is : 4

Solution :

a = µg =5

v

Find s using above equations

Answer Discuss it!

.

Correct answer is : 3

Answer Discuss it!

.

Correct answer is : 1

Solution :

From momentum conservation

mvî + 3m(2v)ĵ = (4m)v̂

v̂ = (v/4)î + (6/4)vĵ

=(v/4)î + (3/2)vĵ

Answer Discuss it!

.

Correct answer is : 2

Answer Discuss it!

.

Correct answer is : 3

Solution :

KE = L

From angular momemtum conservation about centre

L → constant

I = mr

KE' = L

r' = r/2

KE' = 4KE

K.E. is increased by a factor of 4

Answer Discuss it!

.

Correct answer is : 2

Solution :

U

4 * (1/100)(1/10)

=40

Answer Discuss it!

.

Correct answer is : 2

Solution :

KE

φ = 2.75 eV

E = φ + KE = 12.75eV

Energy difference between n = 4 and n = 1

value of n = 4

Answer Discuss it!

.

Correct answer is : 2

Answer Discuss it!

.

Correct answer is : 2

Solution :

P→4N

Q→N

Half time T

T

Let after time t number of nuclie of P and Q are equal that is 4N

=N

4/2

t = 4min

N

at t=4min.

N

N

popu of R= (4N

Answer Discuss it!

.

Correct answer is : 2

Solution :

RtanΘ = 4H

R * tan 45° = 4H

H

tan φ =H

=1/2

Answer Discuss it!

.

Correct answer is : 2

Answer Discuss it!

.

Correct answer is : 4

Solution :

Current through DC = 2 - 1 = 1 A from D to C

Path DBCB

V

V

V

Answer Discuss it!

.

Correct answer is : 3

Solution :

u=10cm

v=15cm

f=?

use -1/u + 1/v =1/f

f=-30cm

Answer Discuss it!

.

Correct answer is : 3

.

Correct answer is : 2

Question 53

**Test cross in plants or in Drosophila involves crossing**.

Correct answer is : 3

Solution :

It is a defination of test cross

Question 54

**Some vascular bundles are described as open because these**.

Correct answer is : 2

Solution :

Open means presence of cambium during sec. growth. Vascular cambium divides to form secondary xylem towards Inner side while sec. Phloem towards outside

Question 55

**In mitochondria, protons accumulate in the**.

Correct answer is : 3

Question 56

**The breakdown of detritus into smaller particles by earthworm is a process called**.

Correct answer is : 2

Question 57

**Whorled, simple leaves with reticulate venation are present in**.

Correct answer is : 4

Solution :

Whorled phyllotaxy is feature of Nerium and Alstonia. In Alstonia five leaves present in a whorl while in Nerium three leaves present in a whorl

Question 58

**Sweet potato is homolgous to**.

Correct answer is : 4

Solution :

Sweet potato and turnip both are roots

Question 59

**The unequivocal proof of DNA as the genetic material came from the studies on a**.

Correct answer is : 4

Question 60

**Consider the following four statements whether they are correct of wrong**

(A) The sporophyte in liverworts is more elaborate than that in mosses

(B) Salvinia is heterosporous

(C) The life- cycle in all seed-bearing plants is diplontic

(D) In pinus male and female cones are borne on different trees(A) The sporophyte in liverworts is more elaborate than that in mosses

(B) Salvinia is heterosporous

(C) The life- cycle in all seed-bearing plants is diplontic

(D) In pinus male and female cones are borne on different trees

.

Correct answer is : 2

Solution :

(A) Sporophyte is more developed in mosses rather than liver wort.

(B) Pinus is Monoecious in which male & female cones are borne on different branch.

Question 61

**Consider the following four statements (A-D) related to the common frog Rana tigrina, and select the correct option stating which ones are true (T) and which ones are false (F) Statements :**

(A) On dry land it would die due to lack of O2 its mouth is forcibly kept closed for a few days

(B) It has four- chambered heart

(C) On day land it turns uricotelic from ureotelic

(4) Its life-history is carried out in pond water(A) On dry land it would die due to lack of O2 its mouth is forcibly kept closed for a few days

(B) It has four- chambered heart

(C) On day land it turns uricotelic from ureotelic

(4) Its life-history is carried out in pond water

.

Correct answer is : 1

Solution :

(A) Dry skin cause ceased cutaneous respiration

(B) Three chembered heart.

(C) Frog never be uricotalic

(D) External fertilization and in water

Question 62

**In Kranz anatomy, the bundle sheath cells have**.

Correct answer is : 2

Question 63

**Given below is the ECG of a normal human. Which one of its components is human, Which one of its components is correctly interpreted below**.

Correct answer is : 3

Solution :

Peak P-causes diastolic phase in ventricle while R-Peak causes systole in ventricle means diastolic and systolic phases represented by P & R and same Diastolic and systolic B.P.

Question 64

**Which one of the following structures in Pheretima is correctly matched with its function**.

Correct answer is : 1

Solution :

Clitellum - secretes cocoon during breading season of earthworm. Gizzard -grinding of food particles. setae help in locomotion. Typhlosole increases the absorption area in intestine

Question 65

**Selaginella and Salvinia are considered to represent a significant step toward evolution of seed habit because:**.

Correct answer is : 4

Question 66

**Bulk of carbon dioxide (CO**_{2}) released from body tissues into the blood is present as.

Correct answer is : 1

Solution :

70% to 75% CO

_{2}is transported as NaHCO

_{3}by plasma and KHCO

_{3}by RBCs

Question 67

**In angiosperms, Functional megaspore develops into**.

Correct answer is : 1

Solution :

During megagametogenesis functional megaspore (mostly chalazal) gives rise to embryo sac

Question 68

**Consider the following statements (A)-(D) each with one or two blanks.**

(A) Bears go into __(1)__ during winter to __(2)__ cold weather

(B) A conical age pyramid with a broad base represents __(3)__ human population

(C) A wasp pollinating a fig flower is an example of __(4)___

(D) An area with high levels of species richness is known as __(5)___

Which one of the following options give the correct fill ups the respective blank numbers from (1) to (5) in the statements(A) Bears go into __(1)__ during winter to __(2)__ cold weather

(B) A conical age pyramid with a broad base represents __(3)__ human population

(C) A wasp pollinating a fig flower is an example of __(4)___

(D) An area with high levels of species richness is known as __(5)___

Which one of the following options give the correct fill ups the respective blank numbers from (1) to (5) in the statements

.

Correct answer is : 4

Question 69

**What is common between vegetative reproduction and Apomixis**.

Correct answer is : 4

Solution :

The progeny are genetically similar to parent and called clone

Question 70

**Common cold is not cured by antibiotics because it is**.

Correct answer is : 4

Solution :

The progeny are genetically similar to parent and called clone

Question 71

**Which one of the following is not an essential mineral element for plants while the remaining three are**.

Correct answer is : 3

Solution :

Cadmium is not essential element for plants

Question 72

**Biodiversity of a geographical region represents**.

Correct answer is : 2

Question 73

**Which one of the following is not considered as a part of the endomembrane system ?**.

Correct answer is : 2

Solution :

Except peroxisome the remaining three and ER are the parts of Endomembrane system.

Question 74

**Which one of the following correctly represents the normal adult human dental formula ?**.

Correct answer is : 3

Question 75

**Charge q is uniformly spread on a thin ring of radius R. The ring rotates about its axis with a uniform frequency f Hz. The magnitude of magnetic induction at the centre of the ring is**.

Correct answer is : 1

Solution :

B = µI/2R

I = q/T=qf

B = µ

_{0}qf /2R

Question 76

**The figure shows four animals (a), (b), (c) and (d). Select the correct answer with respect to a common characteristics of two of these animals.**

.

Correct answer is : 4

Solution :

From Annaelida to chordata all are Eucoelomate C-Mollusca (Octopus), D-Arthropoda (Scorpion)

Question 77

**In history of biology, human genome project led to the development of :**.

Correct answer is : 3

Question 78

**Which one of the following conditions of the zygotic cell would lead to the birth of a normal human female child ?**.

Correct answer is : 1

Question 79

**Which one of the following is essential for photolysis of water ?**.

Correct answer is : 1

Question 80

**Which one of the following techniques made it possible to genetically engineer living organism ?**.

Correct answer is : 1

Question 81

**Ureters act as urogenital ducts in**.

Correct answer is : 4

Question 82

**The type of muscles present in our :**.

Correct answer is : 3

Solution :

Thigh muscles are skeletal muscle that are striated and voluntary.

Question 83

**Pure Si at 500K has equal number of electron (n**_{e}) and hole (n_{h}) concentrations of 1.5 * 10^{16}m?^{-3}. Doping by indium increases n_{h}to 4.5 * 10^{22}m?^{-3}. The doped semiconductor is of :.

Correct answer is : 4

Solution :

n

_{i}

^{2}= n

_{e}n

_{h}

n

_{e}= 0.5 *10

^{10}

n

_{h}= 4.5 *10

^{22}

n

_{h}>>n

_{e}

Trivalent impurity

→p type semiconductor

Question 84

**Read the following four statements (A-D) about certain mistakes in two of them**

(A) The first transgenic buffalo, Rosie produced milk which was human alpha-lactal bumin enriched.

(B) Restriction enzymes are used in isolation of DNA from other macro-molecules.

(C) Downstream processing is one of the steps of R-DNA technology.

(D) Disarmed pathogen vectors are also used in transfer of R-DNA into the host.

Which are the two statements having mistakes ?(A) The first transgenic buffalo, Rosie produced milk which was human alpha-lactal bumin enriched.

(B) Restriction enzymes are used in isolation of DNA from other macro-molecules.

(C) Downstream processing is one of the steps of R-DNA technology.

(D) Disarmed pathogen vectors are also used in transfer of R-DNA into the host.

Which are the two statements having mistakes ?

.

Correct answer is : 4

Solution :

Transgenic Rosie is actually cow Restriction enzymes cut the DNA at specific site The separation of DNA is performed by Gel electrophorasis

Question 85

**The 24 hour (diurnal) rhythm of our body such as the sleep-wake cycle is regulated by the hormone :**.

Correct answer is : 4

Solution :

Responsible for circadian cycle

Question 86

**Guttation is the result of :**.

Correct answer is : 4

Solution :

Guttation is due to root pressure.

Question 87

**Examine the figure given below and select the right option giving all the four parts (a, b, c and d) correctly identified.**.

Correct answer is : 1

Question 88

**Three of the following pairs of the human skeletal parts are correctlymatched with their respective inclusiveskeletal category and one pair is not matched. Identify the non-matching pair**Disease | Gausative Organisms | Mode of Infection |

.

Correct answer is : 2

Solution :

Glenoid cavity found in pectoral girdle

Question 89

**Which one of the following aspects is an exclusive characteristic of living things ?**.

Correct answer is : 3

Question 90

**"Good ozone " is found in the :**.

Correct answer is : 3

Question 91

**Which one of the following is a wrong matching of a microbe and its industrial product, while the remaining three are correct ?**.

Correct answer is : 3

Solution :

Clostridium butylicum form butyric acid

Question 92

**The logistic population growth is expressed by the equation**.

Correct answer is : 2

Question 93

**Two identical piano wires kept under the same tension T have a fundamental frequency of 600 Hz. The fractional increase in the tension of one of the wires which will lead to occurrence of 6 beats/s when both the wires oscillate together would be :**.

Correct answer is : 1

Solution :

1/2l * √(F/µ) = f (for fundamentalmode)

l and µ are constant

Taking ln on both side & differentiating

= dF/2F = df/f

= dF/F = 2*df/f

=2 * 6/600 = 0.02

Question 94

**In the following figure, the diodes which are forward biased, are :**.

Correct answer is : 2

Solution :

Only in (a) and (c),

Diodes are forward biased

As p?type should be higher potential & n?type at lower potential.

Question 95

**The threshold frequency for a photosensitive metal is 3.3 * 10**^{14}Hz. If light of frequency 8.2 * 10^{14}Hz is incident on this metal, the cut-off voltage for the photoelectric emission is nearly :.

Correct answer is : 1

Solution :

KE = hv - hv

_{th}=eV

_{0}

^{14}- 3.3 * 10

^{14}

Question 96

**A galvanometer of resistance, G is shunted by a resistance S ohm. To keep the main current in the circuit unchanged, the resistance to be put in series with the galvanometer is :**.

Correct answer is : 3

Solution :

G = GS/(S+G) + S'

G- GS/(S+G) = S'

S' = G

^{2}/(S+G)

Question 97

**A square loop, carrying a steady current I, is placed in a horizontal plane near a long straight conductor carrying a steady current I**_{1}at a distance d from the conductor as shown in figure. The loop will experience.

Correct answer is : 4

Solution :

F

_{1}> F

_{2}. hence net attraction force will be towards conductor.

Question 98

**A thermocouple of negligible resistance produces an e.m.f. of 40 µV/°C in the linear range of temperature. A galvanometer of resistance 10ohm whose sensitivity is 1µA/div, is employed with the termocouple. The smallest value of temperature difference that can be detected by the system will be :**.

Correct answer is : 4

Solution :

1 division = 1µA

current for 1°C = 40µ/10 = 4µA

1µA = 1/4 °C = 0.25°C

Question 99

**The r.m.s. value of potential difference V shown in the figure is :**.

Correct answer is : 2

Question 100

**A coil has resistance 30 ohm and inductive reactance 20 Ohm at 50 Hz frequency. If an ac source, of 200 volt, 100 Hz, is connected across the coil, the current in the coil will be :**.

Correct answer is : 1

Solution :

R = 30 Ω

X

_{L}= 20 Ω = Lω

f = 50 Hz

X

_{L'}= 20/50 * 100= 40 Ω (Θ ω' = 2ω)

Z = √(R

^{2}+ X

_{L'}

^{2}) = 50 Ω

I

_{max}= 200/50 = 4A

Question 101

**A particle of mass m is thrown upwards from the surface of the earth, with a velocity u. The mass and theradius of the earth are , respectively,Mand R. G is gravitational constant and g is acceleration due to gravityon the surface of the earth. The minimum value of u so that the particle does not return back to earth, is :**.

Correct answer is : 1

Solution :

GM = gR

^{2}

=V

_{e}= √(2gR)

=√(2GM/R

^{2})*R

=√(2GM/R)

Question 102

**Azener diode, having breakdown voltage equal to 15V, is used in a voltage regulator circuit shown in figure. The current through the diode is :**.

Correct answer is : 4

Solution :

Voltage across zener diode is constant

(i)

_{1kΩ}15 volt / 1kΩ = 15mA

(i)

_{250Ω}(20-15)volt / 250Ω = 20mA

(i)

_{zener diode}= 20-15 =5mA

Question 103

**A particle covers half of its total distance with speed v**_{1}and the rest half distance with speed v_{2}. Its average speed during the complete journey is :.

Correct answer is : 2

Solution :

V

_{av}= S+S/(S/V

_{1}+ S/V

_{2}) = 2v

_{1}v

_{2}/ ( v

_{1}+ v

_{2})

Question 104

**The electric potential V at any point (x, y, z), all in meters in space is given by V = 4x**^{2}volt. The electric field at the point (1, 0, 2) in volt/meter is :.

Correct answer is : 4

Question 105

**A short bar magnet of magnetic moment 0.4J T**^{?-1}is place in a uniform magnetic field of 0.16 T. The magnet is stable equilibrium when the potential energy is:.

Correct answer is : 1

Solution :

For stable equilibrium U =-?MB

=-(0.4) (0.16)

= ?-0.064 J

Question 106

**A thin prism of angle 15° made of glass of refractive index µ**_{1}= 1.5 is combined with another prism of glass of refractive index µ_{2}= 1.75. the combination of the prism produces dispersion without deviation . The angle of the second prism should be:.

Correct answer is : 2

Solution :

Deviation = zero

So, δ = δ

_{1}+ δ

_{2}= 0

( µ

_{1}-1)A

_{1}+ (µ

_{2}-1)A

_{2}= 0

A

_{2}=-0.5/0.75 * 15°

A

_{2}=-10°

Question 107

**Aconveyor belt ismoving at a constant speed of 2m/s.Abox is gently dropped on it. The coefficient of friction between them is µ= 0.5. The distance that the box will move relative to belt before coming to rest on it taking g = 10 ms**^{-?2}, is.

Correct answer is : 4

Solution :

a = µg =5

v

^{2}= u

^{2}+ 2as

Find s using above equations

Question 108

**A mass of diatomic gas (γ = 1.4) at a pressure of 2 atmospheres is compressed adiabatically so that its temperature rise from 27°C to 927°C. The pressure of the gas is final state is :**.

Correct answer is : 3

Question 109

**A mass m moving horizontally (along the x-axis) with velocity v collides and sticks to mass of 3m moving vertically upward (along the y-axis) with velocity 2v. The final velocity of the combination is :**.

Correct answer is : 1

Solution :

From momentum conservation

mvî + 3m(2v)ĵ = (4m)v̂

v̂ = (v/4)î + (6/4)vĵ

=(v/4)î + (3/2)vĵ

Question 110

**Two particle are oscillating along two close parallel straight lines side by side, with the same frequency and amplitudes. They pass each other, moving in opposite directions when their displacement is half of the amplitude. The mean positions of the two particles lie on a straight line perpendicular to the paths of the two particles. The phase difference is :**.

Correct answer is : 2

Question 111

**A small mass attached to a string rotates on frictionless table top as shown. If the tension is the string is increased by pulling the string causing the radius of the circular motion to decrease by a factor of 2, the kinetic energy of the mass will:**.

Correct answer is : 3

Solution :

KE = L

^{2}/2I

From angular momemtum conservation about centre

L → constant

I = mr

^{2}

KE' = L

^{2}/2mr'

^{2}

r' = r/2

KE' = 4KE

K.E. is increased by a factor of 4

Question 112

**The density of material in CGS system of units is 4g/cm**^{3}. In a system of units in which unit of lengths is 10 cm and unit of mass is 100 g, the value of density of material will be :.

Correct answer is : 2

Solution :

U

_{2}= U

_{1}* (M

_{1}/ M

_{2}) * (L

_{1}/ L

_{2})

^{-3}

4 * (1/100)(1/10)

^{-3}

=40

Question 113

**An electron in the hydrogen atom jumps from excited state n to the ground state. The wavelength so emitted illuminates a photosensitivematerial having work function 2.75 eV. If the stopping potential of the photoelectron is 10 V, the value of n is :**.

Correct answer is : 2

Solution :

KE

_{max}=10eV

φ = 2.75 eV

E = φ + KE = 12.75eV

Energy difference between n = 4 and n = 1

value of n = 4

Question 114

**A particle of mass M is situated at the centre of spherical shell of mass and radius a. The magnitude of the gravitational potential at a point situated at a/2 distance from the centre, will be:**.

Correct answer is : 2

Question 115

**Two radioactive nuclei P and Q, in a given sample decay into a stable nucleolus R. At time t = 0, number of P species are 4 N**_{0}and that of Q are N_{0}. Half-life of P (for conversion to R) is 1 minute where as that of Q is 2 minutes. Initially there are no nuclei of R present in the sample. When number of nuclei of P and Q are equal, the number of nuclei of R present in the sample would be.

Correct answer is : 2

Solution :

P→4N

_{0}

Q→N

_{0}

Half time T

_{P}=1min

T

_{Q}= 2min

Let after time t number of nuclie of P and Q are equal that is 4N

_{0}/2

^{t/1}

=N

_{0}/2

^{t/2}

4/2

^{t/2}=1

t = 4min

N

_{P}=N

_{0}/4

at t=4min.

N

_{Q}= N

_{0}/2

^{4/2}

N

_{0}/4

popu of R= (4N

_{0}-N

_{0})+(N

_{0}-N

_{0}/4)

Question 116

**A projectile is fired at an angle of 45° with the horizontal. Elevation angle of the projectile at its highest point as seen from the point of projection is :**.

Correct answer is : 2

Solution :

RtanΘ = 4H

_{max}

R * tan 45° = 4H

_{max}

H

_{max}= R/4

tan φ =H

_{max}/(R/2)

=1/2

Question 117

**Out of the following which one is not a possible energy for a photon to be emitted by hydrogen atom according to Bohr?s atomic model?**.

Correct answer is : 2

Question 118

**In the circuit shown in the figure, if potential at point A is taken to be zero the potential at point B is :**.

Correct answer is : 4

Solution :

Current through DC = 2 - 1 = 1 A from D to C

Path DBCB

V

_{C}= 1V

V

_{DC}=2*1=2V

V

_{B}=0 + 1 + 2V -2V

Question 119

**A conversing beam of rays is incident on a diverging lens. Having passed though the lens the rays intersect at a point 15 cm from the lens on the opposite side. If the lens is removed the point where the rays meets will move 5 cm closer to the lens. The focal length of the lens is :**.

Correct answer is : 3

Solution :

u=10cm

v=15cm

f=?

use -1/u + 1/v =1/f

f=-30cm

Question 120

**Three charges, each +q, are placed at the corners of an isosceles triangle ABC of sides BC and AC, 2a. D and E are the mid points of BC and CA. The work done in taking a charge Q from D to E is:**.

Correct answer is : 3

Pairs of skeletalparts | Category |

TOTAL = 120 | |||

ANSWERED = | |||

CORRECT / TOTAL = | /120 | ||

POSITIVE SCORE = | |||

NEGATIVE SCORE = | |||

FINAL SCORE = |

## Prepjunkie

Home . Contact . About . Disclaimer

Prepjunkie© 2015

Picture Palace Tilak Road Mussoorie, Uttarakhand

contactus@prepjunkie.com

About Prepjunkie PrepJunkie provides comprehensive guidance for entrance exams with well thought of solutions for selected questions, notes, books & much more.