IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: Sneha’s weight is 140% of Veena’s weight. Rina’s weight is 90% of Sana’s weight. Sana weighs twice as much as Veena. If Sneha’s weight is x% of Rina’s weight, then x is equal to: 2013 0

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    596/9
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    605/9
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    645/9
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  • 4
    700/9
    सही
    गलत
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उत्तर : 4. "700/9"
व्याख्या :

Answer: D) 700/9 Explanation: Let Veena's weight = 1 kg Sana's weight = 2 kg Sneha's weight = 1.4 kg Rina's weight = 1.8 kg Now,according to the given data in the question, 1.8x100 = 1.4   x = 1.4 × 1001.8 = 7009 = 77 79.

प्र: In e-FRRO, 'FRRO' stands for? 2012 0

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    Foreigners Reacceptance Registration Office
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    Foreigners Regional Registration Office
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    Foreigners Regaining Registration Office
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    Foreigners Registry Registration Office
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उत्तर : 2. "Foreigners Regional Registration Office"
व्याख्या :

Answer: B) Foreigners Regional Registration Office Explanation: Home Minister Rajnath Singh launched the web-based application e-FRRO (e-Foreigners Regional Registration Office) scheme under which foreigners can avail, various visa and immigration-related services online. This will facilitate hassle-free travel to India for foreigners.

प्र: Negative divided by Negative 2011 0

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    -ve
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    +ve
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    0
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    Can't be determined
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उत्तर : 2. "+ve"
व्याख्या :

Answer: B) +ve Explanation: We know the Mathematical rules that   ++ = ++- = --+ = --- = +

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उत्तर : 2. "100"
व्याख्या :

Answer: B) 100 Explanation: Let the Efficiency of pavan be E(P) Let the Efficiency of sravan be E(S) Here Work W = LCM(25,20) = 100 Now, E(P+2S) = 100/25 = 4 ....(1) E(2P+S) = 100/20 = 5 ....(2) Hence, from (1) & (2) we get E(S) = 1 => Number of days Savan alone work to complete the work  = 100/1 = 100 days.

प्र: The average age of 7 boys is increased by 1 year when one of tem whose age is replaced by a girl. What is the age of the girl ? 2010 0

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    33 yrs
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    27 yrs
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    21 yrs
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    29 yrs
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उत्तर : 4. "29 yrs"
व्याख्या :

Answer: D) 29 yrs Explanation: Let the avg age of 7 boys be 'p' yearsLet the age of the girl be 'q' yearsFrom given data,The age of 7 boys = 7p yearsNow the new average = (p + 1) when 22 yrs is replaced by qNow the age of all 7 will become = 7(p + 1) yrsHence, 7p - 22 + q = 7(p + 1) yrs7p - 22 + q = 7p + 7q = 22 + 7 = 29 Therefore, the age of girl = q = 29 years.

प्र: What is a process whereby an Ecosystem can renew itself? 2010 0

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    Succession
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    Reconstruction
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    Cleansing
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    Purification
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उत्तर : 1. "Succession"
व्याख्या :

Answer: A) Succession Explanation: The process which wherein an Ecosystem may renew itself is known as Ecological Succession. The time scale may be decades or a million of years after a mass extinction.  It may be achieve over a period of time.

प्र: What was the purpose of the double v campaign? 2010 0

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उत्तर :
व्याख्या :

The Double V Campaign was used in World War II. The purpose of the double v campaign is to fight for victory and ending segregation at home. It was aimed at African-Americans, and it first appeared in an African-American newspaper, the Pittsburgh Courier, in 1942. The Double V Campaign worked to have a victory over racism abroad and racism in the United States.It stood so it gave a chance for Black Americans to fight in the war so they could achieve Victory at Home and Abroad- (Civil Rights then the war in the Atlantic and Pacific).

प्र: On her deathbed, a grand mother called upon his three grand sons and told them to distribute all her assets worth Rs. 52,500 in the ratio of 1/35 : 1/21 : 1/15 amongst themselves. Find the smallest share amongst the three portions ? 2010 0

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    Rs. 5422
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    Rs. 10,500
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    Rs. 12,800
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    Rs. 15,000
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उत्तर : 2. "Rs. 10,500"
व्याख्या :

Answer: B) Rs. 10,500 Explanation: The ratio of distribution should be: 21 x 15 : 15 x 35 : 35 x 21= 315 : 525 : 735 = 3 : 5 : 7The smallest share will be of worth: 3/15 x 52,500 = Rs. 10,500

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