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1 Molecular Basis of Inheritance

In DNA finger-printing, advantage is taken of the fact that

1) DNA, as a whole differs from person to person
2) sections of DNA like repetitive DNA differ from person to person
3) DNA can be easily printed as a chromatogram
4) radioactive isotopes can be used as labels in respect of as many as three atoms, S, P and C

Option 1

Option 2 Solution:

Option 3

Option 4

2 Morphology of Flowering Plants

Which of the following is endogenous in origin?

1) Leaf
2) Stem
3) Root
4) Bud

Option 1

Option 2

Option 3 Solution:

Option 4

3 Chemical Kinetics

A chemist prepares 1.00 g of pure $$_{6}^{11}{C}$$. This isotope has half-life of 21 min, decaying by equation:
$$_{6}^{11}{C} \longrightarrow _{5}^{11}{B}+_{1}^{0}{e}$$

What is rate of disintegration per second (dps) at start?
1) 3×10¹⁹ dps
2) 4×10¹⁹ dps
3) 6×10¹⁹ dps
4) None

Option 1 Solution:

Solution

$$\displaystyle -\frac{dN}{dt}=\lambda N_0$$
where $$\lambda$$(disintegration constant) $$\displaystyle = \frac{0.693}{T_{50}}$$ and $$N_0$$ the number of atoms present initially
$$\displaystyle N_0=\frac{weight}{atomic\quad weight}\times Avogadro's\quad number$$
$$\displaystyle -\frac{dN}{dt}=\frac{0.693}{21\times 60}\times \frac{1}{11}\times 6.02\times 10^{23}$$ dps
$$=3\times 10^{19}$$ dps

Option 2

Option 3

Option 4

4 Environmental Chemistry

The function of automobile catalytic converter is to control emissions of:

1) carbon dioxide and hydrogen

2) carbon monoxide and hydrogen

3) carbon monoxide and carbon dioxide

4) carbon monoxide and nitrogen dioxide

Option 1

Option 2 Solution:

Solution

CA catalytic converter is an emissions control device that converts toxic gases and pollutants in exhaust gas to less toxic pollutants by catalyzing a redox reaction (an oxidation and a reduction reaction).

Catalytic converters are used with internal combustion engines fueled by either petrol (gasoline) or diesel—including lean-burn engines as well as kerosene heaters and stoves.

These "two-way" converters combined oxygen with carbon monoxide (CO) and unburned hydrocarbons (HC) to produce carbon dioxide and water.

Option 3

Option 4

Dark reaction does not require light but needs
1) Water
2) ATP + NADPH2
3) Oxygen
4) Chlorophyll pigment

Option 1

Option 2 Solution:

Option 3

Option 4

The element that helps in transport of electrons from water in photosynthesis
Molybdenum
Zinc
Chlorine
Boron

Option 1

Option 2

Option 3 Solution:

Option 4

7 The Living World

Choose the correct pair option:
(i) Growth by mass – Defining property.
(ii) Hominidae – Family of humans.
(iii) Potato and brinjal – belong to the same species.
(iv) The specialised gardens with collections of living plants – Indian Botanical Garden.
(v) Biological names – Seldom Latin.

1) (i), (ii) and (v).
2) (ii) and (iv).
3) (i), (ii) and (iv).
4) (ii), (iii) and (iv).

Option 1

Option 2 Solution:

Answer

(i) incorrect as Cellular metabolism is defining characteristic

(iii) incorrect as Potato: Species: S. tuberosum and brinjal: Species: S. melongena

(v) incorrect: Biological name written in italic or underline

(ii) correct as Hominidae was originally the name given to the family of humans and their (extinct) close relatives, with the other great apes (that is, the orangutans, gorillas, and chimpanzees) all being placed in a separate family, the Pongidae

(iv) is correct : A botanical garden or botanic garden is a garden dedicated to the collection, cultivation, preservation and display a wide range of plants labelled with their botanical names

Option 3

Option 4

8 Environmental Chemistry

Biochemical Oxygen Demand(BOD) value can be a measure of water pollution caused by the organic matter. Which of the following statements is correct?

1) Polluted water has BOD value higher than 10 ppm

2) Aerobic bacteria decrease the BOD value

3) Anaerobic bacteria increase the BOD value

4) Clean water has BOD value higher than 10 ppm

Option 1 Solution:

Solution

Clean water has BOD value less than 5 ppm. Polluted water has BOD value higher than 10 ppm

Option 2

Option 3

Option 4

9 Biomolecules

Which of the following is NOT a nitrogen base of nucleotides present in plasmid DNA?

1) Thymine
2) Cytosine
3) Uracil
4) Adenine

Option 1

Option 2

Option 3 Solution:

SOLUTION

Uracil is not a nitrogen base of nucleotides present in plasmid DNA because it is only present in RNA as uridine but is replaced by thymidine in DNA .

Option 4

10 Alternating Currents

When a series combination of LL and RR are connected with a 10V 50HZ A.C. source, a current 1A flows in the circuit. The voltage leads the current by a phase angle of π/3 radian. Then the resistance is

1) 15Ω
2) 10Ω
3) 5Ω
4) 20Ω

Option 1

Option 2

Option 3 Solution:

Solution

$$Vrms=10V, Irms=1A$$

i.e. $$tan\dfrac{\pi}{3}=\dfrac{x_L}{x_R}$$

$$\sqrt{3}=\dfrac{x_L}{R}$$

also $$\dfrac{10}{z}=1$$

$$10^2=R^2\times X_L^2$$

$$10^2=R^2+3^2$$

$$100=4R^2$$

$$R=5\Omega$$

Option 4

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