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1 Environmental Chemistry

Oil refineries, paper factories, textile and sugar mills, chemical factories are responsible for water pollution.These industries discharge harmful chemicals into revers and streams, and pollute water. The chemicals released include

1) arsenic

2) lead

3) fluorides

4) all of the above

Option 1

Option 2

Option 3 Solution:

Solution

The chemicals released include arsenic, lead and fluorides which lead to toxicity in plants and animals.

Option 4

Plant fibres can originate from:
1. phloem, xylem epidermis and sclerenchyma tissues
2. phloem, xylem and sclerenchyma tissues
3. phloem, xylem and epidermis tissues
4. xylem, epidermis and sclerenchyma tissues

Option 1 Solution:

Option 2

Option 3

Option 4

3 Basic Concepts of Chemistry

In a hydrocarbon, the mass of hydrogen to carbon is 1:3. The empirical formula of the hydrocarbon is

1) CH
2) CH₂
3) CH₄
4) C₂H

Option 1

Option 2

Option 3 Solution:

Solution

Ratio of Hydrogen : Carbon mass
1 : 3
Ratio of atoms1 : 3/12
Or 4 : 1
H=4 atoms C=1 atom

Option 4

4 Chemistry in Everyday Life

When sodium stearate CH3(CH2)16COONa, is added to hard water the formula of one possible precipitate is:

1) (CH₃(CH₂)₁₆COO)₂Ca

2) (CH₃(CH₂)₁₆COO)₂Ba

3) (CH₃(CH₂)₁₆COO)₂Cd

4) CH₃(CHv)₁₆COOK

Option 1 Solution:

Solution

When sodium stearate CH₃(CH₂)₁₆COONa, is added to hard water, calcium of hard water reacts with the soap and replaces its sodium and forms calcium precipitate, (CH₃(CH₂)₁₆COO)₂Ca

Option 2

Option 3

Option 4

5 The Living World

Match the names of branches of biology listed under column I with the help of study given under column II, choose the answer which gives the correct combination of the alphabets of the two columns-

Column I Column II

(Branch of biology) (Field of study)

(A) Palynology (p) Silkworks

(B) Oncology (q) Pollens

(D) Sericulture (s) Algae

1) A = s, B = q, C = r, D = P

2) A = q, B = r, C = s, D = P

3) A = s, B = r, C = q, D =p

4) A = r, B = q, C = s, D = p

Option 1

Option 2 Solution:

Answer

A = q, B = r, C = s, D = P
Palynology ->algae , Oncology -> Cancer, Phycology ->Pollens, Sericulture -> silkworks

Option 3

Option 4

6 Ray Optics

A commonly used lens coating material is MgF₂ with n=1.38.. Find the thickness of non-reflective coating, one shall have for 550nm light if it is applied to glass of n=1.52.

1) 400nm
2) 200nm
3) 300nm
4) 100nm

Option 1

Option 2

Option 3

Option 4 Solution:

Solution

$$550nm$$ wavelength in $$MgF_2$$ will be $$\lambda=\displaystyle \frac{\displaystyle \lambda_{air}}{n}=\displaystyle \frac{550}{1.38}=400nm$$
$$l=\displaystyle \frac{\lambda}{4}=100nm$$

7 Biological Classification

Certain organisms possess specialized structures called heterocysts that help in fixing one of the gases from the atmosphere using the enzyme nitrogenase. Which group of organisms possess heterocysts?

1) Dinoflagellates
2) Euglenoid
3) Cyanobacteria
4) Archaebacteria

Option 1

Option 2

Option 3 Solution:

Solution

Cyanobacteria are the blue-green algae which have the ability of nitrogen fixation. The nitrogenase enzyme is present in the heterocyst of this organism. The heterocysts are the specialised cells other than the vegetative cells. The nitrogenase enzyme helps in the nitrogen fixation.

Option 4

8 Atomic Structure

the position of both, electron and helium atom is known with in 0.1nm. Further the momentum of electron is known with in 5.0×10^-26 kg ms^-1The minimum uncertainty in the measurement of momentum of helium atom is

1) 50 kgms^-1
2) 5.0 ×10^-26 kgms^-1
3) 80 kg m s-1
4) 80.0 ×10^-26 kgms^-1

Option 1

Option 2 Solution:

Solution

Δx_e Δp_e=Δx_He Δp_He
As Δx_e=Δx_He
Δp_e=Δp_He

Option 3

Option 4

9 The Living World

Which one of the following generates new genetic combinations leading to variation ? 
1) Sexual reproduction
2) Nucellar polyembryony
3) Vegetative reproduction
4) Parthenogenesis

Option 1 Solution:

Answer

Sexual reproduction :the production of new living organisms by combining genetic information from two individuals of different types (sexes). Since both individuals have different genetic make up so variation is maximum
Nucellar polyembryony :Zygotic and nucellar embryos can occur in the same seed, and a zygotic embryo can divide to produce multiple embryos. . Thus same genetic material with little variation.
Vegetative reproduction : A form of asexual reproduction in plants, in which multicellular structures become detached from the parent plant and develop into new individuals that are genetically identical to the parent plant.
Parthenogenesis reproduction from an ovum without fertilization

Option 2

Option 3

Option 4

In man, normal blood glucose level per 100 ml of blood is
1) 50-80 mg

2) 80-120 mg

3) 100-150 mg

4) 120-180 mg

Option 1

Option 2 Solution:

Option 3

Option 4

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