Explore topic-wise InterviewSolutions in Current Affairs.

a. The exaggerated response of the immune system to certain antigens present in the environment is called allergic reaction. 

b. Anti-histamine, adrenaline, steroids. [Any two] 

c. In metro cities, due to deteriorating air quality the sensitivity to the environment and allergens have increased in children. This has resulted in lowering of immunity due to modern day lifestyle.

Correct answer is

(C) Back cross is always a test cross.

i. TtRrAa = 8 (TRA, TRa, TrA, Tra, tRA, tRa, trA, tra)

ii. TTRrAABB = 2 (TRAB, TrAB)

iii. TtAaBbRRCC = 8 (TABRC, TAbRC, TaBRC, TabRC, tABRC, tAbRC, taBRC, tabRC)

iv. TTaabbCCDDrreeyy = 1 (TabCDrey)

(B) chewing and biting

Correct option (B) Modern forms of life may have evolved from earlier forms of life

Explanation:

Fossils are the remains or impressions of the dead animals and plants that lived in the remote past.

ln the ocean, fossils are settled at the bottom in the soil/sand layer by layer. ln the course of time, these layers changed into rocks due to the presence of the water above and also due to chemical reactions. The distribution of fossils indicates that early fossils present in the bottom layer are simple, however, the recent fossils found in the upper layers are more complex. Thus, the fossil of layer Y will be more complex than that of layer X. Also, the fossil of layer X was formed before the fossil of layer Y. As the modern animals are more complex than the earlier animals, thus, modern forms of life may have evolved from earlier forms of life.

True

Diversity refers to flora, fauna of that particular region and loss of these may cause an ecological imbalance as they play an important role in maintaining our diversity.

(a) Chipko movement

i. Azoic

ii. Archeozoic

iii. Proterozoic

iv. Palaeozoic

v. Mesozoic

vi. Cenozoic

(d) none of the above

Coal is used in thermal power plant.

(b) Carbon monoxide

The only progressive trend in evolution seems to be that more and more complex body designs have emerged over a period of time.

a. T(K) = t°C +273.15 

∴ T(K) = -15 °C + 273.15 

= 258.15 K

b. T(K) = t°C +273.15 

∴ T(K) = 25°C + 273.15 

= 298.15 K

c. T(K) = t°C + 273.15 

∴ T(K) = -197 °C + 273.15 

= 76.15 K

d. T(K) = t°C + 273.15 

∴ T(K) = 273 °C + 273.15 

= 546.15 K

Postulates of modern cell theory:

1. All living organisms are made up of cells. 

2. Cell is the basic structural and functional unit of life. 

3. All cells arise from pre-existing cells. (Rudolf Virchow 1858 – “Omnis cellula-e-cellula”). 

4. Total activities of cells are responsible for activity of an organism.

5. Cells show transformation of energy. 

6. Cells contain nucleic acids; DNA and RNA in the nucleus and cytoplasm.

Smooth endoplasmic reticulum (SER): 

1. Depending on cell type, it helps in synthesis of lipids for e.g. Steroid secreting cells of cortical region of adrenal gland, testes and ovaries. 

2. Smooth endoplasmic reticulum plays a role in detoxification in the liver and storage of calcium ions (muscle cells).

Rough Endoplasmic Reticulum (RER): 

1. Rough ER is primarily involved in protein synthesis. For e.g. Pancreatic cells synthesize the protein insulin in the ER. 

2. These proteins are secreted by ribosomes attached to rough ER and are called secretory proteins. These proteins get wrapped in membrane that buds off from transitional region of ER. Such membrane bound proteins depart from ER as transport vesicles. 

3. Rough ER is also involved in formation of membrane for the cell. The ER membrane grows in place by addition of membrane proteins and phospholipids to its own membrane. Portions of this expanded membrane are transferred to other components of endomembrane system.

The pressure created while applying a force on a liquid is transmitted equally in all direction inside the liquid. That is why there is no fixed direction for the pressure transmitted. Hence we can say that hydrostatic pressure is a scalar quantity.

When a man sitting in a boat drinks m gram of water from the pond, the weight of (boat + man) system will increase by mg and so the system will displace m gram more water for floating. Due to removal of water from pond, the water level in pond will fall. But due to water displaced by the floating system the water level in the pond will rise. Since the water removed from the pond is equal to the water displaced by the system, the level of water in the pond remains unchanged.

• In the plane of the paper itself. The axis of the compass is vertical and the field due to the conductor is also vertical. 
• It could result in a dip of compass needle which is not possible in this case (dips result only if axis of compass is horizontal). 
• The deflection is maximum when the conductor through A is perpendicular to the plane of paper and the field due to it is maximum in the plane of the paper

Yes, we can express the motion of objects by graphs.

Force makes the objects move and moving object to come to rest.

Characteristics of angle of contact:

1. It depends upon the nature of the liquid and solid in contact, and is constant for a given liquid-solid pair, other factors remaining unchanged.

2. It depends upon the medium (gas) above the free surface of the liquid. 

3. It is independent of the inclination of the solid to the liquid surface. 

4. It changes with surface tension and, hence, with the temperature and purity of the liquid.

D) Movement of train on tracks is translatory motion.

Bernoulli's theorem is applicable only for the ideal fluids in streamlines motion. Since, the flow of water in a river in a rapid way can not be treated as streamlined motion, the theorem can not be used.

False. Bernoulli’s equation can be applied only to streamline flow.

Correct option is A) Translatory motion
 

No

Bernoulli’s equation cannot be used to describe the flow of water through a rapid in a river because of the turbulent flow of water. This principle can only be applied to a streamline flow. 

Figure (a) is incorrect. From the equation of continuity AV = constant. Thus, when the area of constriction is narrow, velocity of streamline is high. If the velocity is high, we can say that the pressure head is low at that point (from Bernoulli’s equation). Correspondingly the height of the liquid column should be lesser at the narrow construction than that of the wide construction. Hence figure (a) is incorrect.

No. The flow of water through a rapid in a river is turbulent and hence Bernoulli’s principle cannot be applied.

No, unless the atmospheric pressure at the two points where Bernoulli’s equation is applied are significantly different.

No

It does not matter if one uses gauge pressure instead of absolute pressure while applying Bernoulli’s equation. The two points where Bernoulli’s equation is applied should have significantly different atmospheric pressures.

It is pressure exerted by the atmosphere of our earth.

Units used in medicine, physiology etc.

1 mm of mercury = 1 torr

1 torr = 133 Pa

Nits of meterology etc.

1 bar = 10⁵ Pa

1 millibar = 10² Pa

An ideal fluid should have the following qualities:

(a) It should be non-viscous, i.e., dragging force or other opposing force should be zero.

(b) It should have steady flow.

(c) It should be incompressible.

(d) The flow of such fluid should be stream line.

A) All points

The angle of contact between water and the material of the rain coat is obtuse. So the rain water does not wet the rain coat.

C) concave mirror

1. Yes the Incident angle and the Reflected angles are same.

2. According to this law, the value of Incident angle and the Reflected angle are always same.

Incident angle (i) = Reflected angles (r)

3. According to the second law of reflection, incident ray, reflected ray and normal all exist in same plane.

Specific heat (s)

= θ/m x θ

= ML²T^-2/[M] [K]

= [M⁰L²T^-2K^-1]

1. The image formed by a plane mirror is upright (erect).

2. The image of the object is equal in size to the object.

B) Concave mirror

Correct option is C) 20 cm

Latent heat = θ(Heat energy)/m(mass)

= [ML²T^-2/[M]

=[M⁰L²T^-2]

D) Distance of the image behind the mirror is greater than the distance of the object from the mirror.

Correct option is D) 9:25

Correct option is C) 4m

By doing so, the area of outlet of water eject is reduced, so velocity of water increases according to equation of continuity, av = constant

Correct option is: (A) more in thin bar.

There will be no change in mass. The volume will undergo largest percentage increase; while the radius, minimum. it is because, volume  of the spherical ball depends on cube of its radius: