IIT JEE प्रश्न और उत्तर का अभ्यास करें
8प्र: What Asks But Never Answers? 1679 05b5cc6b1e4d2b4197774d2ef
5b5cc6b1e4d2b4197774d2ef- 1Teacherfalse
- 2Telephonefalse
- 3Letterfalse
- 4Owltrue
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उत्तर : 4. "Owl"
व्याख्या :
Answer: D) Owl Explanation: An owl. "What noise does an owl make? The sound an Owl makes, it sounds like, "Who?" to our ears. They sounds entire lives asking the same question, but they'll never give any answers.
प्र: Is C2 Paramagnetic or Diamagnetic? 1679 05b5cc6b3e4d2b4197774d3d7
5b5cc6b3e4d2b4197774d3d7- 1Paramagneticfalse
- 2Diamagnetictrue
- 3Ferromagneticfalse
- 4Can't be determinedfalse
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उत्तर : 2. "Diamagnetic"
व्याख्या :
Answer: B) Diamagnetic Explanation: Paramagnetic Molecules :: If the Electronic configuration of a molecule has any unpaired electrons, then that molecule is said to be Paramagnetic. Diamagnetic Molecules :: If the Electronic configuration of a molecule has only paired or spin paired electrons, then that molecule is said to be Diamagnetic. Here the molecule C2 has all paired electrons in its electronic configuration. So C2 is Diamagnetic. Whereas, B2 molecule has unpaired electrons. So B2 is Paramegnetic.
प्र: A shopkeeper sold a mobile phone for Rs. 12000. Had he offered discount of 10% on the selling price, there would be a loss of 4%. What is the cost price of that Mobile phone? 1679 05b5cc6bce4d2b4197774d8a7
5b5cc6bce4d2b4197774d8a7- 1Rs. 12,500false
- 2Rs. 11,250true
- 3Rs. 12,750false
- 4Rs. 11,680false
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उत्तर : 2. "Rs. 11,250"
व्याख्या :
Answer: B) Rs. 11,250 Explanation: Given that SP = Rs. 12000 - 10% = Rs. 10,800 Loss% = 4 We know that, C.P = 100/(100 - Loss%) x 100 => 100/100-4 x 10800 => 1080000/96 C.P = Rs. 11,250
प्र: What percent is 120 of 85 ? 1678 05b5cc6dde4d2b4197774ea0a
5b5cc6dde4d2b4197774ea0a- 1133.33 %false
- 2141.17 %true
- 3145.54 %false
- 4139.29 %false
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उत्तर : 2. "141.17 %"
व्याख्या :
Answer: B) 141.17 % Explanation: Px85100=120 => p = 12000/85 = 141.17 %
प्र: Arjuna Award was introduced in _____ ? 1678 05b5cc6d3e4d2b4197774e53b
5b5cc6d3e4d2b4197774e53b- 11971false
- 21961true
- 31951false
- 41987false
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उत्तर : 2. "1961"
व्याख्या :
Answer: B) 1961 Explanation:
प्र: The purest form of iron is 1678 05b5cc7efe4d2b41977751d76
5b5cc7efe4d2b41977751d76- 1wrought irontrue
- 2steelfalse
- 3pig ironfalse
- 4nickel steelfalse
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उत्तर : 1. "wrought iron"
व्याख्या :
Answer: A) wrought iron Explanation: Wrought Iron is the purest form of iron. It contains 0.12 to 0.25% carbon and so it is the purest form of iron.
प्र: Which best describes an element? 1678 05b5cc699e4d2b4197774c746
5b5cc699e4d2b4197774c746- 1An element is composed of identical atomsfalse
- 2A pure substancefalse
- 3a material that has consistent chemical propertiesfalse
- 4Both A & Btrue
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उत्तर : 4. "Both A & B"
व्याख्या :
Answer: D) Both A & B Explanation: An Element is a pure substance of one type of atom. In chemistry, any material such as carbon, hydrogen, iron, or oxygen that cannot be broken down into more fundamental substances is nothing but an element.
प्र: Choose what replaces '?' in the following figure ? 1678 05b5cc758e4d2b4197774fc19
5b5cc758e4d2b4197774fc19- 1Qfalse
- 2Ofalse
- 3Mfalse
- 4Ntrue
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उत्तर : 4. "N"
व्याख्या :
Answer: D) N Explanation: The alphabetical value of the letters in the left hand column follows through the sequence of Prime Numbers, with the letters in the right hand column representing the corresponding reverse alphabetical values. So, M = Reverse of M = N.

