IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: Resistance of human body in dry condition 5001 0

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    10 ohm
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    1000 ohm
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    10000 ohm
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  • 4
    100000 ohm
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उत्तर : 4. "100000 ohm"
व्याख्या :

Answer: D) 100000 ohm Explanation: Under dry conditions, the resistance offered by the human body may be as high as 100,000(10^5) Ohms.   Depending on the person, a rough value for the internal resistance of the human body is 300-1,000 Ohms. The skin's resistance is much lower if it is wet or burnt/blistered. There are a lot of factors involved and not every person has the same electrical resistance. For instance, men tend to have lower resistance than women. Within the body, the tissues with the greatest resistance are bone and fat - nerves and muscle have the least resistance.

प्र: What is the principle carbohydrate of milk? 2692 0

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    Fructose
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    Sucrose
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    Lactose
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    Galactose
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उत्तर : 3. "Lactose"
व्याख्या :

Answer: C) Lactose Explanation: Lactose is the major carbohydrate in the milk of most species.   Lactose is a disaccharide composed of the monosaccharides D-glucose and D-galactose, joined in a ß-1,4-glycosidic linkage. The chemical name for lactose is 4-0-ß-D-galactopyranosyl-D-glucopyranose.

प्र: Which statement is true of all atoms that are anions? 2547 0

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    The atom has fewer protons than does a neutral atom of the same element.
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    The atom has more protons than electrons.
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    The atom has more neutrons than protons.
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    The atom has more electrons than protons.
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उत्तर : 4. "The atom has more electrons than protons."
व्याख्या :

Answer: D) The atom has more electrons than protons. Explanation: Anions are atoms or radicals (groups of atoms), that have gained electrons. Since they now have more electrons than protons, anions have a negative charge.

प्र: The product of a number and its multiplicative inverse is 4891 0

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    1
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    0
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    -1
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    Infinity
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उत्तर : 1. "1"
व्याख्या :

Answer: A) 1 Explanation: The mutiplicative inverse of a number is nothing but a reciprocal of a number. Now, the product of a number and its multiplicative inverse is always equal to 1.   For example : Let the number be 15 Multiplicative inverse of 15 = 1/15 The product of a number and its multiplicative inverse is = 15 x 1/15 = 1.

प्र: How many inches is 5' 4"? 2036 0

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    66
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    64
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    62
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    60
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उत्तर : 2. "64"
व्याख्या :

Answer: B) 64 Explanation: We know 1 feet = 12 inches. According to the question, 5' 4''  =  5 feet 4 inches = 12 x 5 + 4 = 64 inches.   Hence,  5' 4''  =  5 feet 4 inches = 64 inches.

प्र: Cosmetic powders are prepared from 2251 0

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    Talc
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    Serpentine
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    Asbestos
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    Gypsum
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उत्तर : 1. "Talc"
व्याख्या :

Answer: A) Talc Explanation: Cosmetic powders are prepared from Talc. Face powder is a cosmetic powder applied to the face to set a foundation after application. It can also be reapplied throughout the day to minimize shininess caused by oily skin. There is translucent sheer powder, and there is pigmented powder.

प्र: Animal migration on savannas is often governed by 1857 0

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    Rainfall
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    Distance
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    Reproduction
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    Fire
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उत्तर : 1. "Rainfall"
व्याख्या :

Answer: A) Rainfall Explanation: Savannas are home to a wide diversity of animals. Many animals of the savanna migrate throughout the year, searching for food and water. Many of the droughts are seasonal and hit one area before another, so animals are constantly following the rains.   Hence, Rain fall is what often governs animal migration on savannas.

प्र: A F Z U G L T _  Find the next letter in the above given letter series? 2635 0

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    K
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    M
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    O
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    Q
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उत्तर : 3. "O"
व्याख्या :

Answer: C) O Explanation: Given series is A F Z U G L T _ Starts with A A + 5 letters = F go to end of alphabet= Z Z - 5 letters = U from F go one more to G + 5 letters = L from U go one back to U, T - 5 letters = O   Second Method :: Change the letters to their corresponding number. A=1 B=2 C=3 ... Z=26 A F Z U G L T _ 1 6 26 21 7 12 20 ? Look at the pattern: the 1st and 3rd numbers = 27, 1+26 the 2nd and 4th numbers = 27, 6+21 the 5th and 7th numbers = 27, so the 6 and 8th would also equal 27. 27 - 12 = 15, so the letter is O.

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