IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: There are approximately how many muscles in Human body ? 1860 0

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    206
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    310
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    554
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    700
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उत्तर : 4. "700"
व्याख्या :

Answer: D) 700 Explanation: Approximatey there are 700 muscles in Human body.

प्र: A train covers 180 km distance in 5 hours. Another train covers the same distance in 1 hour less. What is the difference in the distances covered by these trains in one hour if they are moving in the same direction? 1859 0

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    15 kms
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    9 kms
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    6 kms
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    18 kms
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उत्तर : 2. "9 kms"
व्याख्या :

Answer: B) 9 kms Explanation: The first train covers 180 kms in 5 hrs => Speed = 180/5 = 36 kmph Now the second train covers the same distance in 1 hour less than the first train => 4 hrs => Speed of the second train = 180/4 = 45 kmph Now, required difference in distance in 1 hour = 45 - 36 = 9 kms.

प्र: The ratio of speeds of a car, a train and a bus is 5:9:4. The average speed of the car, the bus and the train is 72 km/hr together. What is the average speed of the car and the train together ? 1859 0

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    84 km/hr
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    96 km/hr
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    72 km/hr
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    60 km/hr
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उत्तर : 1. "84 km/hr"
व्याख्या :

Answer: A) 84 km/hr Explanation: Let the speeds of the car, train and bus be 5x, 9x and 4x km/hr respectively.Average speed = 5x + 9x + 4x/3 = 18x /3 = 6x km/hr.Also, 6x = 72 => x = 12 km/hrTherefore, the average speed of the car and train together is = 5x+9x2= 7x = 7 x 12 = 84 km/hr.

प्र: Twelve percent of Kalyan's monthly salary is equal to the sixteen per cent of Nandu's monthly salary. Sarnesh's monthly salary is half that of Nandu's monthly salary. If sarnesh's annual salary is Rs. 1.08 lacs, What is Kalyan's monthly salary ? 1858 0

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    15,000
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    36,000
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    24,000
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    12,500
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उत्तर : 3. "24,000"
व्याख्या :

Answer: C) 24,000 Explanation: Let K = Kalyan's monthly salaryN = Nandu's monthly salaryS = Sarnesh's monthly salary.Then from given data, 12% of K = 16% of NS = N/2 => N = 2SK = 16/12 x N = 16/12 x 2S= 16/6 x 1.08/12 = 16/6 x 0.09 = 0.24 lacs = 24,000

प्र: If a trader sold two cars each at Rs. 404415 and gains 15% on the first and loses 15% on the second, then his profit or loss percent on the whole is ? 1857 0

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    1.44 %
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    2.02 %
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    1.04 %
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    2.25 %
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उत्तर : 4. "2.25 %"
व्याख्या :

Answer: D) 2.25 % Explanation: SP of each car is Rs. 404415, he gains 15% on first car and losses 15% on second car. In this case, there will be loss and percentage of loss is given by = [(profit%)(loss%)]/100 = (15)(15)/100 % = 2.25%

प्र: Which of the following statements about monosaccharide structure is true? 1857 0

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    Aldoses and ketoses differ in the position of their hydroxyl groups.
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    Monosaccharides can be classified according to the spatial arrangement of their atoms.
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    All monosaccharides contain carbon, hydrogen, oxygen, and nitrogen atoms.
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    A six-carbon sugar is called a pentose.
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उत्तर : 2. "Monosaccharides can be classified according to the spatial arrangement of their atoms."
व्याख्या :

Answer: B) Monosaccharides can be classified according to the spatial arrangement of their atoms. Explanation: Monosaccharides, also called simple sugars, are the most basic units of carbohydrates. They are fundamental units of carbohydrates and cannot be further hydrolyzed to simpler compounds.   Hence, Monosaccharides can be classified according to the spatial arrangement of their atoms is true about Monosaccharides.

प्र: Why is Golden Rice pale yellow in color? 1856 0

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    Rich in Beta-Carotene
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    Rich in Phycobilins
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    Rich in Chlorophyll
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    None
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उत्तर : 1. "Rich in Beta-Carotene"
व्याख्या :

Answer: A) Rich in Beta-Carotene Explanation: Golden Rice (Oryza sativa) denotes a genetically modified rice capable of biosynthesizing and accumulating β-carotene (provitamin A) in the endosperm, yielding a characteristic yellow color in the polished grains. Golden rice was developed to help cope with vitamin A deficiency, a problem that prevails in developing countries, affecting millions (Underwood, 2000; UNICEF, 2000). Vitamin A deficiency causes mortality and growth retardation in children and frequently impairs vision, leading to blindness. It also contributes indirectly to anemia by interfering with iron bioavailability.   The endosperm of Golden Rice (Oryza sativa) is yellow due to the accumulation of β-carotene (provitamin A) and xanthophylls. The product of the two carotenoid biosynthesis transgenes used in Golden Rice results in Pale Yellow color.

प्र: Which of the following is considered a modified stem? 1856 0

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    Tendril
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    Taproot
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    Petiole
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    Tuber
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उत्तर : 4. "Tuber"
व्याख्या :

Answer: D) Tuber Explanation: Tuber is considered as a modified stem. These type of stems carry out special functions that are important for the plant to survive. Tubers serves as a food reserve and bearing buds wherein new plants can grow.

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