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1 Anatomy of Flowering Plants

Which of the two are associated with each other?

1) Sieve element & companion cell
2) Sieve element & Parenchyma
3) Companion cell & Parenchyma
4) Sieve element & fibre

Option 1 Solution:

Option 2

Option 3

Option 4

2 Haloalkanes and Haloarenes

The organic chloro compound, which shows complete stereochemical inversion during an S_N 2 reaction is

1) (C₂H5)₂ CHCl
2) (CH₃)₃ CCl
3) (CH₃)₂CHCl
4) CH₃Cl

Option 1

Option 2

Option 3

Option 4 Solution:

SOLUTION

Nucleophilic substitution bimolecular (S_N 2) prefers less stericallv hinciered site to attack. Lesser the steric hindrance faster the S_N 2 reaction. So ease of reaction is 1^o > 2^o > 3^o

S_N 2 involves inversion of configuration stereo, chemically. Since, 1o alkyl halides are prone to S_N2 reactions, therefor CH₃Cl undergoes complete strerochemical inversion

3 Chemistry in Everyday Life

Frequent use of sprays, oils and antiseptics in the nose during a bad cold may result in :

1) congestion of the mucous membrane in the nose
2) the spreading of the infection to the sinuses
3) damage to the olfactory nerve
4) destruction of white blood cells

Option 1

Option 2 Solution:

Solution

Frequent use of sprays, oils and antiseptics in the nose during a bad cold may result in the spreading of the infection to the sinuses and other lung diseases.

Option 3

Option 4

Hypokinetic Hypoxia concerned to

(1) Reduced blood flow rate (2) Low O_2� content in blood

(3) Low O₂ in artery (4) Low oxygen content in venous blood

Option 1 Solution:

Option 2

Option 3

Option 4

A child is born with an extra chromosome in each of its cells. This condition is usually the result of

nondisjunction
crossing-over
segregation
hybridization

Option 1 Solution:

Nondisjunction is the result of the paired homologous chromosomes seperating unequally during meiosis. So instead of one of a particular chromosome going to each of the 4 resulting sex cells, one cell gets two chromosomes of that type. Then during fertilization that zygote gets three of that particular chromosome instead of the normal two, resulting in one extra chromosome. That zygote then undergoes mitosis, resulting in all of that organisms cells containing one extra chromosome.

Option 2

Option 3

Option 4

6 Thermodynamics

A gaseous mixture enclosed in a vessel of volume V consists of one mole of gas A with γ(=CP?/CV?)=5/3 and another gas B with γ=7/5 at a certain temperature T. The relative molar masses of the gas A and B are 4 and 32, respectively. The gases A and B do not react with each other and are assumed to be ideal. The gaseous mixture follows the equation PV19/13= constant, in adiabatic processes.
Compute the speed of sound in the gaseous mixture at T=300K.

1) v = 501m/s.

2) v = 401m/s.

3) v = 701m/s.

4) v = 801m/s.

Option 1

Option 2 Solution:

Solution

v= 400.98 m/s

Option 3

Option 4

7 D and F Block Elements

Which of the following is a wrong statement about cast iron ?

1) it contains about 4.5% of carbon
2) it is also called pig iron
3) it contracts on cooling
4) it is corrosion resistant

Option 1

Option 2

Option 3

Option 4 Solution:

8 D and F Block Elements

The solubility of silver bromide in hypo solution is due to the formation of

1) [Ag(S₂O₃)] ^-

2) [Ag(S₂O₃)₂] ^-3

3) Ag₂S₂O

4) Ag₂SO₃

Option 1

Option 2 Solution:

Solution

The solubility of silver bromide in hyposolution due to the formation of [Ag(S₂O₃)₂]^3-

Option 3

Option 4

9 Electrostatics

Charges +9Q and -4Q are placed as shown in figure. The point at which electric field intensity is zero at a distance from B on the line joining AB will be :

1) l
2) 3l
3) 9 / 4l?
4) 2l

Option 1

Option 2 Solution:

Solution

Let x is distance from B where electric field is zero.

Electric field due to +9Q charge is E1? =k(9Q? / x²)

Electric field due to −4Q charge is E2? =

These fields are in same direction.

Net field is zero if E1?+E2?=0⇒

or,(3l−3x)²−(2x)²=0⇒(3l−3x+2x)(3l−3x−2x)=0

∴x=3l,

x=3l? /5

Option 3

Option 4

Which of these protects the changes in basal cell DNA from ultraviolet wavelengths of sunlight

to avoid skin cancer?

(1)Keratinocytes

(2) Melanocytes

(3) Both (1)and (2)

(4) None of these

Option 1

Option 2 Solution:

Melanocytes are found in the epidermis. They are specialized to produce dark pigments called melanin. Melanin protects the DNA in the basal stratum from damage by ultraviolet rays ofsunlight. Changes in basal cell DNA can lead to skin cancer.

Option 3

Option 4

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