IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: Tertiary structure is NOT directly dependent on 1902 0

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    hydrogen bonds
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  • 2
    ionic bonds
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  • 3
    peptide bonds
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  • 4
    hydrophobic interactions
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उत्तर : 3. "peptide bonds"
व्याख्या :

Answer: C) peptide bonds Explanation:

प्र: Who makes it has no need of it. What is it? 1902 0

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उत्तर :
व्याख्या :

A Coffin.

प्र: What kind of pet always stays on the floor? 1902 0

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    Cat
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  • 2
    Dog
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  • 3
    Carpet
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  • 4
    All of the above
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उत्तर : 3. "Carpet"
व्याख्या :

Answer: C) Carpet Explanation: A Carpet is the pet which always stays on the floor.

प्र: From a group of 7 boys and 6 girls, five persons are to be selected to form a team, so that at least 3 girls are there in the team. In how many ways can it be done? 1901 0

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    427
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  • 2
    531
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  • 3
    651
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  • 4
    714
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उत्तर : 2. "531"
व्याख्या :

Answer: B) 531 Explanation: Given in the question that, there are 7 boys and 6 girls.  Team members = 5 Now, required number of ways in which a team of 5 having atleast 3 girls in the team =  6C3  x 7C2  + 6C4 x 7C1 + 6C5= 6x5x43x2x1 x 7x62x1 + 6x5x4x34x3x2x1 x 7 + 6x5x4x3x25x4x3x2x1= 420 + 105 + 6= 531.

प्र: K and L start a business jointly. K invests Rs.16000 for 8 months and L remains in the business for 4 months. Out of the total profit L claims 2/7th share. How much money is contributed by L? 1900 0

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    Rs. 13,204
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  • 2
    Rs. 14,521
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  • 3
    Rs. 12,800
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  • 4
    Rs. 15,000
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उत्तर : 3. "Rs. 12,800"
व्याख्या :

Answer: C) Rs. 12,800 Explanation: Given share of L is 2/7 th of profit. Then, their profits are divided in to 5:2 ratio. Ratio of K and L is 16000×8x×4=52 x = Rs. 12,800.

प्र: What should come in place of the question mark(?) in the following questions ? 316 + 412 - 223 - 11112 = ? 1899 0

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    1 7/12
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  • 2
    1 5/12
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  • 3
    3 7/12
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  • 4
    3 1/12
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उत्तर : 4. "3 1/12"
व्याख्या :

Answer: D) 3 1/12 Explanation: ? = (3 + 4 - 2 - 1) + ( 1/6 + 1/2 - 2/3 - 11/12)  = 4 + [(2+6-8-11)/12]  = 4 - (11/12 )= 31/12.

प्र: The purpose of choke in tube light is 1899 0

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    Induce high voltage
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  • 2
    Induce low resistance
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  • 3
    Induce high resistance
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  • 4
    Induce low voltage
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उत्तर : 1. "Induce high voltage"
व्याख्या :

Answer: A) Induce high voltage Explanation: When the switch is ON, in a tube light choke is nothing but the coil/ballast ( inductor) which is used to induce the high voltage across it. as we know that inductor has property to induce high voltage for the brief period of time, this high voltage is required to ionize the gases in the starter. Then gas inside the starter gets ionized due to this full voltage and heats the bimetallic strip that is caused to be bent to connect to the fixed contact. Current starts flowing through the starter. Although the ionization potential of the neon is the little bit more than that of the argon but still due to small electrode gap high voltage gradient is appeared in the neon bulb and hence glow discharge is started first in a starter. As voltage gets reduced due to the current causes a voltage drop across the inductor, the strip cools and breaks away from the fixed contact. At that moment a large L di/dt voltage surge comes across the inductor at the time of breaking. This high valued surge comes across the tube light electrodes and strikes penning mixture (mixture argon gas and mercury vapor). Gas discharge process continues and current gets the path to flow through the tube light gas only due to low resistance as compared to the resistance of starter.

प्र: A man covers half of his journey by train at 60 km/hr, half of the remaining by bus at 30 km/hr and the rest by cycle at 10 km/hr. Find his average speed during the entire journey? 1898 0

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    32 kmph
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    20 kmph
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  • 3
    18 kmph
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    24 kmph
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उत्तर : 4. "24 kmph"
व्याख्या :

Answer: D) 24 kmph Explanation: Let the total distance of the journey of a man = d kms Now, the average speed of the entire journey = dd120 + d120 + d40  = 24 kmph.

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