IIT JEE Practice Question and Answer
8Q: Voiceless it cries, wingless flutters, toothless bites, mouth-less mutters. What is it? 1939 05b5cc619e4d2b4197774b74c
5b5cc619e4d2b4197774b74c- Show AnswerHide Answer
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Answer :
Explanation :
It is The Wind which cries without a voice, flutters without wings, bites toothless and mutters mouthless.
Q: What can you hear but not touch or see? 1938 05b5cc69ee4d2b4197774c96a
5b5cc69ee4d2b4197774c96a- Show AnswerHide Answer
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Answer :
Explanation :
The sound is what can you hear but not touch or see.
Q: A class has 8 football players. A 5-member team and a captain will be selected out of these 8 players. How many different selections can be made ? 1938 05b5cc6d0e4d2b4197774e38a
5b5cc6d0e4d2b4197774e38a- 1210false
- 2168true
- 31260false
- 410!/6!false
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Answer : 2. "168"
Explanation :
Answer: B) 168 Explanation: we can select the 5 member team out of the 8 in 8C5 ways = 56 ways. The captain can be selected from amongst the remaining 3 players in 3 ways. Therefore, total ways the selection of 5 players and a captain can be made = 56x3 = 168 ways. (or) Alternatively, A team of 6 members has to be selected from the 8 players. This can be done in 8C6 or 28 ways. Now, the captain can be selected from these 6 players in 6 ways. Therefore, total ways the selection can be made is 28x6 = 168 ways.
Q: Mg+O2=MgO Balance the above Chemical equation? 1938 05b5cc6b1e4d2b4197774d2ea
5b5cc6b1e4d2b4197774d2ea- 12Mg + O2 ----> 2MgOtrue
- 22Mg + O ----> 2MgOfalse
- 32Mg + O ----> MgO2false
- 42Mg + O2 ----> MgO2false
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Answer : 1. "2Mg + O2 ----> 2MgO"
Explanation :
Answer: A) 2Mg + O2 ----> 2MgO Explanation: Given Equation is Mg + O2 → MgO Balancing the Chemical Equation is nothing but Conservation of Matter. As Matter is Neither created nor Destroyed, it must be conserved. Here we have 1 Mg and 2 O on the left side and 1 Mg and 1 O on the right side To balance that, add 1 Mg on the left side so that it becomes 2 Mg and 2 O on the left side i.e, 2 Mg + O2 → 2 MgO Here it has 2 Mg & 2 O on the left side and 2 Mg and 2 O on the right side and the Chemical equation is Balanced.
Q: Tanks A and B are each in the shape of a right circular cylinder. The interior of tank A has a height of 10 meters and a circumference of 8 meters, and the interior of tank B has a height of 8 meters and a circumference of 10 meters. The capacity of tank A is what percent of the capacity of tank B ? 1937 05b5cc71ee4d2b4197774f568
5b5cc71ee4d2b4197774f568- 176%false
- 272%false
- 380%true
- 482%false
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Answer : 3. "80%"
Explanation :
Answer: C) 80% Explanation: circumference of A = 2πr = 8 => so r = 4πvolume = π×4π2×10 = 160πcircumference of B = 2πr = 10 => so r = 5πvolume = π×5π2×8 = 200πso ratio of capacities = 160/200 = 0.8 so capacity of A will be 80% of the capacity of B.
Q: The highway transportation system is coordinated by 1937 05b5cc669e4d2b4197774bf72
5b5cc669e4d2b4197774bf72- 1Department of Transportationtrue
- 2Your local police departmentfalse
- 3The Department of Educationfalse
- 4The Internal Revenue Servicefalse
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Answer : 1. "Department of Transportation"
Explanation :
Answer: A) Department of Transportation Explanation:
Q: There are 5 consecutive odd numbers. If the difference between square of the average of first two odd number and the of the average last two odd numbers is 396, what is the smallest odd number? 1937 05b5cc6aee4d2b4197774d165
5b5cc6aee4d2b4197774d165- 129true
- 227false
- 331false
- 433false
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Answer : 1. "29"
Explanation :
Answer: A) 29 Explanation: Let the five consecutive odd numbers be x-4, x-2, x, x+2, x+4 According to the question, Difference between square of the average of first two odd number and the of the average last two odd numbers is 396 i.e, x+3 and x-3 ⇒x + 32 - x - 32 = 396⇒ x2 + 9 + 6x - x2 + 6x - 9 = 396⇒ 12x = 396⇒ x = 33 Hence, the smallest odd number is 33 - 4 = 29.
Q: There are 15 lines in plane. How many intersections (Maximum) can be made ? 1936 05b5cc73de4d2b4197774f916
5b5cc73de4d2b4197774f916- 155false
- 2105true
- 3215false
- 4148false
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Answer : 2. "105"
Explanation :
Answer: B) 105 Explanation: First line will cut all other 14, similarly second will cut 13, and so onTotal = 14+13+12+11+10+9+8+7+6+5+4+3+2+1 = 105.

