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Why Step Down Transformer Is Used In Rectifier

While the use of the type of transformer in a rectifier depends on the voltage requirement or to meet desired operating conditions, a step-down... View Article

How Does Surfactant Reduce Surface Tension

In simple words, we can say a surfactant reduces the surface tension of a liquid such as water by adsorbing at the liquid-gas interface. On the... View Article

Why Should You Never Touch An Alkali Metal With Your Fingers

Alkali metals, in general, are quite dangerous as they are able to react readily with air and moisture. And due to their strong or high reactive... View Article

Is Oxygen Lighter Than Carbon Dioxide

Yes, oxygen is lighter than carbon dioxide.CO2 is heavier than oxygen and we can confirm this with a simple method which is by looking at the... View Article

What Is Meant By Dynamic Stability

In general, the definition of dynamic stability may depend on different systems or parameters. In a broad sense, we can say dynamic stability is... View Article

Which Is Faster Exothermic Or Endothermic

Between exothermic or endothermic, exothermic reactions are said to be faster. This is primarily because in the exothermic process the reactions... View Article

Does Vinegar Dissolve Aluminum

Acids like vinegar (acetic acid) can dissolve aluminium or aluminium foil to different compounds. The acid works more effectively in larger... View Article

What Is The Only Amino Acid That Is Not Chiral

The only amino acid that is not chiral is Glycine. It has no asymmetric (chiral) carbon due to the fact it has sidechain hydrogen. Basically, if... View Article

What Is The Common Name Of 2 Hydroxypropanoic Acid

The common name that is given to 2-hydroxypropanoic acid is lactic acid or milk acid. This chemical compound belongs to the class of... View Article

Are Lithium Batteries Ac Or Dc

All lithium or lithium-ion batteries that are used in different electronic devices operate with direct current (DC) which is mainly generated... View Article

What Are D And L Isomers

When we talk about D and L isomers we are basically referring to two different forms of enantiomers. Here the main concept to understand is that... View Article

7 Persons To Be Seated In A Row Probability That 2 Particular Persons To Sit Next To Each Other Is

1) 3/7 2) 2/7 3) 4/7 4) 5/7 Solution: Option (2) 2/7 Total cases = 7! Favourable cases = 2. 6! Hence, the required probability... View Article

A Pack Of Cards Contains 4 Aces 4 Kings 4 Queens And 4 Jacks Two Cards Are Drawn At Random The Probability That At Least One Of These

1) 9/20 2) 3/16 3) 1/6 4) 1/9 Solution: Option (1) 9/20 Total cases = 16C2 The probability that at least one of them is ace =... View Article

Three Cards Are Drawn At Random From A Pack Of 52 Cards What Is The Chance Of Drawing Three Aces

1) 3/5525 2) 2/5525 3) 1/5525 4) None of these Solution: Option (3) 1/5525 Total cases = 52C3 = 22100 Favourable cases = 4C3 = 4... View Article

A Box Contains 10 Red Balls And 15 Green Balls If Two Balls Are Drawn In Succession Then The Probability That One Is Red And Other Is Green Is

1) 1/3 2) 1/2 3) 1/4 4) None of these Solution: Option (2) ½ Total cases = 25C2 = 300 Favourable cases = 10C1. 15C1 = 10(15) =150... View Article

A Bag Contains 8 Red And 7 Black Balls Two Balls Are Drawn At Random The Probability That Both The Balls Are Of The Same Colour Is

1) 14/15 2) 11/15 3) 7/15 4) 4/15 Solution: Option (3) 7/15 Total cases = 15C2 = 105 Favourable cases = 8C2+7C2 = 28+21 = 49... View Article

From Eighty Cards Numbered 1 To 80 Two Cards Are Selected Randomly The Probability That Both The Cards Have The Numbers Divisible By 4 Is

1) 21/316 2) 19/316 3) 1/4 4) None of these Solution: Option (2) 19/316. Total cases = 80C2 Favourable cases = 20C2 (As, there... View Article

Two Numbers Are Selected Randomly From The Set S 1 2 3 4 5 6 Without Replacement One By One The Probability That Minimum Of The Two

1) 1/15 2) 14/15 3) 1/5 4) 4/5 Solution: Option (4) 4/5 Given that, S = {1, 2,3, 4, 5, 6} Total cases = 2!. 6C2 = 2(15) = 30... View Article

Three Integers Are Chosen At Random From The First 20 Integers The Probability That Their Product Is Even Is

1) 2/19 2) 3/29 3) 17/19 4) 4/19 Solution: Option (3) 17/19 Total cases = 20C3 From the first 20 integers, 10 integers should be... View Article

Out Of 30 Consecutive Numbers 2 Are Chosen At Random The Probability That Their Sum Is Odd Is

1) 14/29 2) 16/29 3) 15/29 4) 10/29 Solution: Option (3) 15/29 Total cases = 30C2 = 435 The sum is odd, if one of the integers is... View Article