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The essential components of a cold storage plant are:- 

Compressor, condenser, expansion device and evaporator for small cold storages the rooms are cooled by air. The warm air from the room is drawn in at the bottom, it passes over the coils of evaporator and chilled air is blown out in the room through the directing louvers. Such units use direct refrigerant in their cooling coils or brine is circulated in which case secondary coils are to be provided. For large cold storages the rooms are cooled by brine which is cooled at control point and pumped through pipes to the respective rooms.

1.Commpressor 

2.Condesing Unit 

3.Evporative Unit 

4. Control Unit 

5.Supply Fan 

6. Humidifier 

7.Boiler 

8. Chiller 

9.Filters 

10. Ducts, Supply and Return

Relay is an electrical operated switch used to disconnect the starting winding or starting capacitor from the circuit when the motor reaches at its rated speed. 

Types of Relays. 

1. Current coil or amperage type relay. 

2. Potential or voltage type relay. 

3. Hot wire relay.

It is a switch which disconnects the electric supply when the oil pressure goes below normal in the compressor. It consist two bellows one bellow is connected to the low pressure side and other to the oil pump where it build the oil pressure. It is connected in series circuit of electric motor.

(d) 1 and 3 are correct.

Desirable properties of ideal refrigerant. 

1. It should be non poisonous. 

2. It should be non-explosive. 

3. It should be non-flammable. 

4. It should be non corrosive to metal.

Leaks of Freon/halocarbon refrigerants are detected with a halide (alcohol) torch. If the intake tube of the halide torch is brought near the leaking joint, then the leaking gas will enter into intake tube of the torch and gives a green hue. Which is a sure indication of a gas leak.

(1) Gibberellin

Pit-fall tray contains a container such as a Jar.

In Berles’s funnel, the top of the funnel extends into a jar of 70% alcohol.

 Alcohol responds to change in temperature in 7-8 seconds.

Ethyl alcohol have LD₅₀ value (mg/kg) 10,000.

The correct answer is Methane.

• Green-House Gas
  • Greenhouse gases are those that absorb and emit infrared radiation in the wavelength range emitted by Earth.
  • Greenhouse gases trap heat and make the planet warmer and are the reason for global warming.
  • Carbon Dioxide, Nitrous Oxide, Methane, and Ozone are trace gases that account for almost 0.1% of Earth's atmosphere and have an appreciable greenhouse effect.
• Methane (CH₄)
  • It is the simplest hydrocarbon consisting of one carbon atom and four hydrogen atoms.
  • It is a powerful greenhouse gas.
  • Major natural sources of methane include emissions from wetlands, and oceans and from the digestive processes of termites.
  • Methane is more than 25 times as potent as carbon dioxide at trapping heat in the atmosphere.

• Hydrogen
  • It has atomic number 1 and mass number 1.
  • It has the simplest atomic structure among all the elements around us in nature.
  • It is the first element in the periodic table.
  • It resembles alkali metals as well as halogens in some properties.
• Oxygen
  • Its atomic number is 8 and its mass number is 16.
  • It is the most abundant of all the elements on earth.
  • It is paramagnetic in nature.
  • Ozone(O3) is an allotropic form of oxygen.
• Nitrogen
  • Its atomic number is 7 and its mass number is 14.
  • It is inert at room temperature.
  • Nitrogen comprises 78% by volume of the atmosphere.​

The correct answer is Uranium.

• Nuclear Power Plant
  • It is a type of power plant that uses the process of nuclear fission in order to generate electricity.
  • They do this by using nuclear reactors in combination with the Rankine cycle, where the heat generated by the reactor converts water into steam, which spins a turbine and a generator.
• Uranium
  • It is a silvery-white element.
  • Its atomic number is 92 and its mass number is 238.
  • This element was discovered by German Chemist MH Klaproth.
  • It is also called the metal of hope.
  • It does not occur in the free state and is extracted from pitch blended ore.
  • It is used in the atomic reactor as nuclear fuel.

• Gasoline
  • It is a derivative product of crude oil or petroleum.
  • It is derived during the fractional distillation process and has a translucent liquid form.
  • It is not used in its crude form. Different additives are added like ethanol to use as fuel for passenger vehicles.
• Gold
  • It is a soft, bright yellow-colored lustrous metal.
  • Its atomic number is 79 and its mass number is 197.
  • It occurs in nature in free element form or in alluvial deposits or in the form of ores.
  • It is used in making ornaments, coins, electroplating, and in the sugar and pharmaceutical industries.
• Radium
  • Radium is a silvery-white metal that does not occur free in nature.
  • It is a chemical element with the symbol Ra and atomic number 83.
  • It was first discovered in 1898 by Pierre Curie and Marie Curie.
  • Radium's main practical use has been in the medicine producing radon gas from radium chloride to be used in radiotherapy for cancer.

The correct answer is Colours that cannot be produced by mixing other colors.

• Primary Colours-
  • Colors that cannot be produced by mixing other colors are termed primary colors or "elemental" colors.
  • The three primary colors are red, yellow, and blue because they are the only colors that cannot be made by mixing any other colors.
  • They can be combined to create additional colors which are called secondary colors. 

f(z) = e^x+iy = e^x.e^iy

= e^x(cos y + i sin y)     (∵ e^iy =  cos y + i sin y)

= e^x cos y + i e^x sin y

By comparing with f(z) = u(x, y) + i v(x, y), we get

u(x, y) = e^x cos y and

v(x, y) = e^x sin y

\(\frac{\partial u}{\partial x}\) = e^x cos y which is continuous on TR²

\(\frac{\partial u}{\partial y}\) = - e^x sin y which is continuous on TR²

\(\frac{\partial v}{\partial x}\) = e^x sin y which is continuous on TR²

\(\frac{\partial v}{\partial y}\) = e^x cos y which is continuous on TR²

By observation, we obtain

\(\frac{\partial u}{\partial x} = \frac{\partial v}{\partial y}\) and \(\frac{\partial u}{\partial y}= -\frac{\partial v}{\partial x}\)\(\)

Hence, function f satisfies the cauchy-riemann equations.

Since, \(\frac{\partial u}{\partial x}\),  \(\frac{\partial u}{\partial y}\), \(\frac{\partial v}{\partial x}\) and \(\frac{\partial v}{\partial y}\) are continuous on TR² and satisfy the cauchy-riemann equations.

\(\therefore\) f(z) = e^x+iy is an analytical function.

Correct option: (4) Combustion of coal

b. Forensic toxicology 

Explanation:

Anuria is non-passage of urine, in practice is defined as the passage of less than 100 ml of urine in a day.

Anuria is mostly caused by a failure in the function of kidneys, but it can also result from problems in the heart.

Some of the causes of anuria include:

• Diabetes: When a person’s blood sugar is consistently high, such as with uncontrolled diabetes, it can result in diabetic ketoacidosis, and damage to the small blood vessels in the kidneys. This can cause acute renal failure and poor or absent urine production.
• Kidney stones: These stones can cause blockages in the kidneys or ureters, the tubes that transport urine from the kidneys to the urethra where it is passed out of the body. These blockages mean the urine is unable to exit the body.
• Kidney failure: Acute kidney failure occurs when the kidneys stop functioning and are unable to filter urine anymore.
• High blood pressure: Also known as hypertension, high blood pressure can damage the blood vessels in the kidneys over time. Without treatment, high blood pressure can lead to permanent kidney damage and anuria.
• Tumours: A growth on or near the kidney can cause a blockage and keep urine from passing out of the body.
• Heart failure: When a person has heart failure the heart cannot pump enough blood around the body. Processes in the body kick in if there is not enough fluid in the blood vessels. One of these is the kidneys ceasing to make urine to hold on to extra fluid.

The correct option is (4) Positively and negatively charged sols, respectively.

Explanation:

Glasgow Coma Scale

• The Glasgow Coma Scale provides a practical method for assessment of impairment of conscious level in response to defined stimuli.
• The Glasgow Coma Scale (GCS) is used to objectively describe the extent of impaired consciousness in all types of acute medical and trauma patients.
• The scale assesses patients according to three aspects of responsiveness: eye-opening, verbal, and motor responses. Reporting each of these separately provides a clear, communicable picture of a patient’s state.

 (D) Mucopolysaccharides

(C) γ-Subunit

(C) G_q proteins

(D) Signal transduction and activators of transcription

(A) Phosphatidyl inositol-4, 5-biphosphate

(D) All of these

In a food chain herbivores are  Primary consumers.

If a linear DNA fragment and a plasmid, each has three recognition sites for EcoRI, then total of four fragments are produced from linear DNA fragment and  three from a circular plasmid. Restriction sites are the sites present on DNA molecule where restriction endonucleases like EcoRI cut the DNA.

Given

One liter of water at 40°C is mixed with one liter of water at 60°C

Calculation 

One liter of water at 40°C is mixed with one liter of water at 60°C

Volume of both are same

Heat will transfer from higher temperature water to lower temperature water

Means from 60°C to 40°C 

Hence 60°C temperature will decrease because of heat transferred to 40°C 

And 40°C temperature will increase 

⇒ Temperature will be between 40°C and 60°C 

One liter of water at 40°C is mixed with one liter of water at 60°C.

∴ The temperature of the mixture will be between 40°C and 60°C.

(i) Here, q = +15 kJ

w = – 5 kJ

∴ According to first law of thermodynamic

ΔU = q + w = 15 + (–5) = 10 kJ 

Thus, internal energy of the system increases by 10 kJ

(ii) Here, w = + 5 kJ

q = – 5 kJ

∴ According to first law of thermodynamics,

ΔU = q + w = – 15 + (+ 5) = – 10 kJ 

Thus, the internal energy of the system decreases by 10 kJ.