a/r solution 4

Biology:

1. B

ADH is secreted by posterior pituitary and its deficiency causes diabetes insipidus characterised by micturating dilute urine several times a day, excessive thirst and dehydration

2. C

The fish meal is prepared from the wastes of fish oil or canning industry or from the whole fish of non oil type. The protein content of this meal is very high and used as a good feed for livestock

3. A

Banding pattern of chromosome is the direct evidence that chimpanzee is human’s closest relative

4. B

The queen bee copulates only once in its life and sperms are stored in spermatheca. It can lay both fertilised (leads to worker and next queen) and unfertilised (leads to drone ) eggs

5. A

Photomodulation of flowering is a phytochrome related process. Phytochrome occurs in two interconvertible forms- P(r) {absorbs red light} and P(fr) {absorbs far red light}. P(fr) is the active form and directly induces flowering

Physics:

1. D

The emf have no relation with the size of battery. Larger dry cells don’t have higher emf, they just last longer(producing same emf) than smaller dry cells of same type

2. B

A red object reflects red colour and absorb other colours, so when viewed in yellow light, red objects appear dark. From rayleigh’s law, we know that scattering is inversely proportional to fourth power of wavelength. As red have largest wavelength, it is scattered least

3. C

The pressure cooker works on the principle that boiling point of a liquid increases with increase of vapour pressure above the liquid. Water, along with food to be cooked are heated in a closed vessel, so that the confined water vapours raises the pressure inside. As a result, water boils at a temperature higher than 100C. when cooker is removed from stove and lid is removed, pressure again decreases due to which its boiling point decreases and water starts boiling again

4. D

From the compass, we are able to know the direction of the magnetic poles. If we know the angle of declination at a particular place( angle between geographical meridian and magnetic meridian) we can find true geographic poles. The magnetic meridian is not along the axis of rotation

5. D

Photoelectric effect demonstrate the particle nature of light. The number of photoelectrons is proportional to intencity

Chemistry:

1. A

Acidic strength is directly proportional to oxidation state

2. C

Cr – [Ar] 3d^5 4s^1

Fully filled s-orbital have greater stability

3. B

Zeolites are shape selective porous solid acid catalysts, their catalytic activity originates from the presence of highly acidic Al-(OH)-Si hydroxyl in the framework

4. C

Due to greater lone pair-bond pair repulsion, the F-S-F bond angle decrease from 180 degrees

5. C

Molecular size decrease from left to right and increas from top to bottom. Thus molecular size of N>O

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