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The boy has stage-fright and he is not confident to perform before the judges and the audience. He is trying to get away but he is being forced by his teacher to say something or sing.

Cooling with dehumidification process is used for air conditioning in summers. The process is carried out by passing the air over a cooling coil whose temperature is lower than the D.P.T. of the air.

Given m = 50g

m = 0.050 kg

v = 200m/s

(i) Momentum P = mv

P = 0.050 x 200

 = 50/1000 x 200

P= 10 kg m/s

De brogli wavelength \(\lambda = \frac{h}{P}\) 

\(\lambda = \frac{6.626\times10^{-34}}{1}\) 

\(\lambda\) = 6.626 x 10^-34 m

Electric field, an electric property associated with each point in space when charge is present in any form. The magnitude and direction of the electric field are expressed by the value of E, called electric field strength or electric field intensity or simply the electric field.

(i) \(\cfrac{T_1}{T_1-T_2}\)

(ii) Less

(iii) Less

An air-conditioning system is defined as an assembly of different parts of the system used to produce a specified condition of air within a required space or building.

The air-conditioning systems are mainly classified as :

1. Central station air- conditioning system. 

2. Unitary air-conditioning system. 

3. District air-conditioning system. 

4. Self-contained air-conditioned units.

Another method of classifying the air-conditioning system is the type of fluid used either for heating or cooling. 

Air-conditioning systems classified as per fluid used are:

(1.) Direct expansion system. 

(2.) All- water systems. 

(3.) All- air systems. 

(4.) Combined systems. 

(5.) Heat pump systems.

Refrigeration

Refrigeration means the cooling of or removal of heat from a system

(i) C.O.P.

(ii) Relative C.O.P.

(iii) \(\cfrac{T_2}{T_1-T_2}\)

(i) . Refrigeration effect + work done 

(ii) . Vapour compression 

(iii) . Compressor

All the given example are occur due to resonance phenomena.

Refrigerant

Most of the commercial refrigeration is produced by the evaporation of a liquid Refrigerant.

(a) 1 and 2 

• The WBT and DBT and Dew point temperature all are equal at saturation curve i.e. RH = 100% of psychrometric chart 

• It is impossible that vapour pressure is equal to total pressure in air-vapour mixture 

• Humidity ratio of 100% has no meaning in psychrometry

Yes, J had. I was in the 10th Standard and I was asked to make a Welcome Speech on the School Day. I was not keen on doing it. But my Principal insisted that I should do it. I prepared a speech and studied it by heart. When I got on the stage on the School Day, I started shivering and shaking and my mind went blank. I could not say a word. The Principal had to prompt me to speak some words. I somehow stammered something and fled from the stage. It was the worst day of my life as my classmates teased me about my ‘Speech’.

Tube- in-tube type/ Double pipe type condensers are used in beverage industries.

Brine is a solution containing the salt in dissolved condition in water. When the temperature required to be maintained is below the freezing point of water. Then the water cannot be used as secondary refrigerant. In such cases, brine solutions are commonly used as a secondary refrigerant.

1 a safety control, 

2. as a temperature control.

(b) Furnace operator

Furnace operator is not a green job.

Normal skin has Ph of about 5.5.

(b) Water

In all water system the working fluid used is Water.

(c) To clean the air

The function of a filter in the air conditioning system is To clean the air.

(b) A safety device

Over load protector in a refrigerator is used as A safety device.

Over load protector is connected in series with motor in a refrigerator.

Muscular dystrophy is a group of diseases that cause progressive weakness and loss of muscle mass. In muscular dystrophy, abnormal genes (mutations) interfere with the production of proteins needed to form healthy muscle.

(a) A central air conditioning plant

A.H.U. is used in A central air conditioning plant.

(b) Conditioned air

A blower in an air conditioning system is used to handle large quantities of Conditioned air.

(d) Ice plants

Dip tanks are used in the Ice plants.

Procedures for Powder Bleach

1. R emove the jewellery and make up 

2. Cleanse the face and neck thoroughly 

3. Prepare the client using head band and wrap the towel or neck cape 

4. Prepare the bleach pack by mixing two tea spoons of bleaching powder, 5-6 drops of liquid ammonia and hydrogen peroxide (20 volumes) as per requirement to make a smooth paste 

5. Cover the client’s eyes with cotton dipped in Rose water 

6. Apply bleach pack in upward and outward movements. Leave for 10- 15 minutes and clean the face with tap water. 

7. Apply moisturizer

The correct option is (c) metanephric

Stages of kidney development: 

• Pronephros is the earliest nephric stage in humans and constitutes the mature kidney in most primitive vertebrates.
• Mesonephros develops by the formation of mesonephric tubules from the intermediate mesoderm, it is the principal excretory organ during early embryonic life (4-8 weeks). It gradually degenerates, although parts of its duct system become associated with the male reproductive organs.
• Metanephros arises caudal to the mesonephros at five weeks of development; it is the permanent and functional kidney in higher vertebrates. It is derived from the intermediate mesoderm. The ureteric bud arises as a diverticulum from the Wollfian duct, close to the entrance to the cloaca and grows towards and inside the metanephric mesenchyme.

The basic function of the overload protector is to protect compressor motor winding from damage due to high current drawn, overheating and over load conditions.

A refrigerant is a substance which will absorb the heat from the source (low temp) and dissipate the same to the sink (high temp) either in the form of sensible heat or in the form of latent heat.

Properties of Ammonia(NH₃) as refrigerant:- 

(1.) It is toxic, flammable, irritating and food destroying. 

(2.) It has low volumetric displacement, low cost, low weight of liquid refrigerant per ton of refrigeration and high efficiency. 

(3.) Ammonia attacks on non-ferrous metals in the presence of water therefore copper and brass are never used with ammonia refrigeration system. 

In a central air-conditioning system, all the components of the system are grouped together in one central room and conditioned air is distributed from the central room to the required places though extensive duct work. The central air-conditioning system is generally used for the load above 25 TR and 2500cubic meter/min of conditioned air. The central plants require the following components and all the components are assembled on the site:-

(A) Cooling and de-humidifying coils 

(B) Heating coils 

(C) Blower with motor 

(D) Sprays for cooling, de humidifying or washing 

(E) Air-cleaning equipments 

(F) A control device.

The central system serves different rooms through extensive duct work with individual control. The system may use one of the following methods to supply the conditioned air.

(a) Air-is conditioned in the center conditioned room and is supplied to the required rooms with controlled air- discharge in each room. 

(b) The water is chilled in the central conditioned room and is supplied to the required room with individual flow control.

Individual evaporator in each room with thermostatic flow control or direct expansion system.

(c) Year round air conditioning

Central air conditioning system is used for Year round air conditioning.

Refrigeration system is used in dairies particularly for preservation of dairy products like milk and butter etc. Milk preservation includes blending, processing, packaging and distribution to the consumers.

There are six basic types of refrigerant flow controls, namely:

• The automatic expansion valve or constant pressure expansion valve 
• The thermostatic expansion valve or constant superheat expansion valve 
• Capillary tube 
• High side float valve 
• Low side float valve 
• Solenoid valve

Correct option: c) Producer

The substances which are used to retard the heat transfer between cold spaces and warm surroundings are commonly known as thermal insulating materials they isolate the warm surrounding from cold refrigerated spaces. The properties of the thermal insulating materials which are used in refrigerating systems to insulate refrigerated spaces from surroundings can be grouped as:- 

(1) Thermal properties 

(2) Mechanical properties 

(3) Physical properties

(1.) Thermal properties:- The ability of a material to retard the flow of heat is given by its thermal conductivity. The thermal conductivity is a property of a homogeneous material which changes with the variation of density. A compressible substance such as glass wool, if loosely packed, is a better insulator than if closely packed. The other important thermal properties are specific heat capacity, thermal diffusivity etc. 

(2.) Mechanical properties:- The mechanical properties of an insulating material includes strength in compression, tension, shear, impact and flexure. These properties become important when some insulating materials are also to be used as load bearing floors and to form self-supporting partitions. 

(3.) Physical properties:- These properties include permanence, low odour level, moisture resistance, safety to health, inflammability, repellence to insects & vermin.

c. Fashion Victims

Consumer segmentation attempts to identify clusters of people who share characteristics. There are people who are extreme followers in fashion, known as Fashion Victims.

Correct option: C. Audio-Video