IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: What process never occurs in interphase? 1282 0

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उत्तर :
व्याख्या :

Absence of cell division is the process that never comes in interphase.

प्र: abcdefghijklmnopqrstuvwxyz Riddle What sentence contains all abcdefghijklmnopqrstuvwxyz? 1281 0

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उत्तर :
व्याख्या :

The Quick Brown Fox Jumped Over The Lazy Dog  is the sentence which contains all 26 alphabets i.e, from a to z.

प्र: Which is an example of Phototropism? 1281 0

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    roots of a plant following water
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    plant bending toward the light
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    roots growing into the soil
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    a venus flytrap capturing a fly
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उत्तर : 2. "plant bending toward the light"
व्याख्या :

Answer: B) plant bending toward the light Explanation: Phototropism is the ability of a photosynthesizing organism, to grow directionally in response to a light source. It is very common in plants, but can also occur in other organisms such as fungi. Example :: Sunflower

प्र: Two parallel chords on the same side of the centre of a circle are 5 cm apart. If the chords are 20 and 28 cm long, what is the radius of the circle? 1281 0

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    14.69 cm
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    15.69 cm
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    18.65 cm
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    16.42 cm
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उत्तर : 2. "15.69 cm"
व्याख्या :

Answer: B) 15.69 cm Explanation: Draw the two chords as shown in the figure. Let O be the center of the circle. Draw OC perpendicular to both chords. That divides the two chords in half.So CD = 10 and AB = 14. Draw radii OA and OD, both equal to radius r.We are given that BC = 5, the distance between the two chords. LetOB = x. We use the Pythagorean theorem on right triangle ABO AO² = AB² + OB² r² = 14² + x² We use the Pythagorean theorem on right triangle DCO DO² = CD² + OC² We see that OC = OB+BC = x+5, so r² = 10² + (x+5)² So we have a system of two equations: r² = 14² + x² r² = 10² + (x+5)² Since both left sides equal r², set the right sidesequal to each other. 14² + x² = 10² + (x+5)² 196 + x² = 100 + x² + 10x + 25 196 = 125 + 10x 71 = 10x 7.1 = x r² = 14² + x² r² = 196 + (7.1)² r² = 196 + 50.41 r² = 246.41 r = √246.41 r = 15.69745202 cm

प्र: Plants are photosynthetic autotrophs. What does this mean? 1279 0

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उत्तर :
व्याख्या :

Plants are photosynthetic autotrophs, which means that they are able to produce their own food through the process called photosynthesis.   In photosynthesis, plants use light, water, and carbon dioxide to create glucose, which they convert to cellulose and use to make new cells.   Hence, that is why, Plants are called photosynthetic autotrophs.

प्र: Number Challenge Puzzle ? 1279 0

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    1
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    4
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    5
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    0
    सही
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उत्तर : 1. "1"
व्याख्या :

Answer: A) 1 Explanation: In each row,  Sum of 1st two digit number + last two digit number = Middle two digit number i.e., 1st row 15 + 40 = 55 2nd row 46 + 47 = 93 Similarly, 7x + 16 = 87 => x = 1.

प्र: Microbial Type Culture Collection Centre is situated at 1279 0

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    Chandigarh
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    New Delhi
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    Hyderabad
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  • 4
    Bangalore
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उत्तर : 1. "Chandigarh"
व्याख्या :

Answer: A) Chandigarh Explanation:

प्र: Which of the following elements has the lowest electronegativity 1278 0

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    Bromine
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    Fluorine
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    Carbon
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    Lithium
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उत्तर : 4. "Lithium"
व्याख्या :

Answer: D) Lithium Explanation: Electronegativity is the tendency for an atom to attract electrons. There are general trends on the periodic table which you can use to determine the relative electronegativity for different elements, but otherwise you can also look at their valence shell and effective nuclear charge to determine their relative electronegativity.   Here from the given options, Lithium has least tendency to attract electrons and thus has a lower electronegativity.

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