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Correct option is A) at

1. Before testing water heater, insulate yourself on the dry wood. 

2. Test the water heater in series of the electric supply to avoid the risk of failure of supply. 

3. Never give direct supply unless you are sure that there is no fault in the water heater to avoid the risk of failure of supply. 

4. Use three-wire cord for the supply. 

5. The water should be switched on to mains only after it is dipped in the water. 

6. Dip the water heater up to the indicated mark and don’t allow terminal housing to be immersed in water. 

7. First switch off the current then remove water heater from the water. 

8. Don’t take out the rod from water at once as soon as you switched off the supply. 

9. Don’t use the immersion heater in other liquids because it is meant for water only and in other liquids, it will have a corroding affect on its surface.

There are many causes of faults in ac motors. Some are listed below:

1. Low insulation resistance 

2. Over-Current

3. Overheating 

4. Vibrations

5.Dirt and moisture

6.Lack of maintenance

The Starting capacitor value must be large.

The valve of the starting winding resistance must be low.

The Torque

Correct option is B) in

No. An ammeter is a measuring device used to measure the electric current in a circuit. A voltmeter is connected in parallel with a device to measure its voltage, while an ammeter is connected in series with a device to measure its current..

Correct option is A) with

Steam at high pressure and temperature.

DC generator: Split rings.

Correct option is D) about

Kota – Nuclear power station

Correct answer is: b. downwards. According to Fleming’s Righthand rule.

Correct option is A) for

Correct option is D) to

Kinetic energy. Others are energy changes related to nuclear power stations.

a. Series. 

b. Parallel. 

c. Series Connection. 

d. Parallel Connection. 

e. Parallel Connection. 

f. Parallel Connection.

Overloading or short-circuiting may occur during the working of electrical devices due to some problems in the mains or within the circuit. The excess current produced is discharged to the ground through the earth wire. This is known as earthing.

Thus earthing provides safety in the electrical circuits. In household electrical circuits for the effective functioning of the earth wire, the earthing system should be proper.

• The pit in which the earth wire is placed should be filled with salt and coal.
• During summers it is required to wet the places where it is earthed.

a. Bulb glows.

b. No change in the intensity of light. There is no back emf produced as DC current is used in the circuit.

c. Intensity of light decreases. Back emf is produced in the circuit as A.C current flows through it and current is decreased.

Doubles:

In the game, there are two players on each side. After having been decided which side is to deliver the service first, the player in the right hand service court of that side shall start the game. He shall serve to the opposing player in the right service court. This matter is decided by the toss winners, and the other matters by the losing one. It is decided before hand whether the game shall have 15 points or 21.

If the opponent returns the shuttle before it touches the ground to the player who started the game, he shall again return it to the latter. In this way, the play shall continue until the foul is made or the shuttle falls down on the ground. In case the service is not returned or the foul is made by the opposing side, the player doing the service shall score one point.

The members of the team delivering the service shall change their service court. Now the player doing the service shall be in the left hand service court and shall serve to the player of the opposing team in the left hand service court. In the beginning of each game, each team shall deliver the service from the right hand service court.

Artificial respiration any method of forcing air into the lungs in a person who still has a pulse but whose breathing has stopped. Artificial respiration can be given with no equipment, so that it is an ideal emergency first aid procedure. Ideally, it should be given using a pocket face mask or a bag valve mask; in the absence of emergency resuscitation equipment, mouth-to-mouth RESUSCITATION may be done

The earth line is connected to the metal casing of the electrical appliances.

The earth pin is thick and long. As it is long it first comes in contact with the earth. Similarly, it loses the contact with the earth only at the end. As it is thick it offers less resistance. It carries more current than the amount of current coming from the phase.

POSSIBLE FAULTS 

(a) By switching on the supply, if the shaft of the motor does not rotate. 

(b) the tip bowl leaks. 

(c) the blades are broken. 

(d) the switch knob is loose. 

(e) the motor burns. 

(f) the blade does not rotate properly (freely).

1. Leaking mixer grinder: Leaking proves to be one of the most common mixer grinder problems. To correct it, you first need to check the blade assembly and ensure that it is tightly screwed onto the jar. Another reason for a leaking mixer could be problem with the rubber gasket.

2. Stuck buttons of the mixer grinder: Another one of the common mixer grinder problems is stuck buttons. This usually happens when foods and liquids spill a little bit and enter the space in between the buttons. To correct this issue, you must unplug the appliance and give it a nice thorough cleaning.

3. Slow moving blades: Out of the many common mixer grinder problems, one is slow moving blades. This can prove irritating because in this case the foods and liquids take a long time to get mixed or churned. In most of the cases, this problem is caused due to food particles clogging the blade assembly.

Earth line comes into contact with the pin E.

The pin E of a three-pin plug comes into contact with the earth line. This pin is now connected to the body of the appliance. If the body comes into contact with an electrie connection, electricity flows to the earth through the earth wire. The flow of current to the earth through a circuit of low resistance increases the current. Hence heat generated in the fuse wire increases, the fuse wire melts and the circuit is broken. This will protect the instrument and the person handling it.

The two teams shall toss before the play starts. 

The toss winning team shall have the option of:

(I) Serving First
(II) Choosing Sides.

Men’s doubles and singles games consist of 7.

We can divide Badminton court into two parts. Right court and left court.

ELCB helps to break the circuit automatically whenever there is a current leak due to insulation failure or any other reason. Hence a person touching the electric circuit or a device does not get an electric shock. Nowadays RCCB, which ensures more safety than ELCB is made use of. In an ELCB one end of the relay coil is connected to the outer metallic cover and the other end is earthed.

If current leaks into the earth due to insulation failure or any other reason, a potential difference is developed between the ends of the relay coil. As a result, ELCB gets tripped off if the current exceeds a particular limit. This is with the help of a relay. In RCCB there is a provision to distinguish between the phase current and neutral current and to break the circuit if needed.

To increase the body temperature.

Significance of Inbreeding:– 

(i) Inbreeding increases homozygosity in the population which is used for developing a pure line of animals. 

(ii) It helps in accumulation of superior genes and elimination of less desirable genes. 

(iii) It increases the productivity of inbreed population. 

(iv) Inbreeding exposes harmful recessive genes that are eliminated by selection.

Goals of Human genome project:– 

(i) Identify all the genes in Human DNA. 

(ii) Determine the sequence of 3 billion chemical base pairs that make up human DNA. 

(iii) Store this information in Database. 

(iv) Address the ethical, legal and social issues that may arise from the project.

Mutations are sudden heritable discontinuous variations which appear in the organisms due to permanent change in their genotype. Hugo-de-vries coined the term mutation

Middle lamella

Interphase occupies the maximum part of cell cycle.

Barrier method is a contraceptive in which ovum and sperms are prevented from physically meeting with the help of barriers. Such methods are available for both males and females. eg. Condoms

Microgametogenesis is the process in plant reproduction where a microgametophyte develops in a pollen grain to the three called stage of its development. In flowering plants it occurs with a microspore mother cell inside the anther of the plant.  

(C) Epinephrine

Option : D. Iodine

Option : C. Pancreas

Option : A. LH

Option : C. Producer

Option : C. Darwinism

हैलोजन प्रबल ऑक्सीकारक इसलिए होते है क्योंकि हैलोजन कम वियोजन ऊर्जा और उच्च ऋणात्मक इलेक्ट्रॉन लब्धि एन्थैल्पी के साथ अत्यधिक विद्युत ऋणात्मक होते हैं। इसलिए, उनमें एक इलेक्ट्रॉन प्राप्त करने की उच्च प्रवृत्ति होती है । इसलिए, वे मजबूत ऑक्सीकरण एजेंट के रूप में कार्य करते हैं।

Option : A. Well