प्रश्न और उत्तर का अभ्यास करें
8प्र: Two metallic plate of equal thickness and coefficient thermal conductivity K1 and K2 put together face to face. A common plate is constructed. What is equivalent K? 1901 05b5cc6bfe4d2b4197774d9e7
5b5cc6bfe4d2b4197774d9e7- 1K1k2/k1+k2false
- 22k1k2/k1+k2true
- 3K1+k2/k1k2false
- 4Nonefalse
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उत्तर : 2. "2k1k2/k1+k2"
व्याख्या :
Answer: B) 2k1k2/k1+k2 Explanation: We know that, The equivalent K = L1 + L2L1K1+L2K2 where L1 & L2 are plate1 & Plate2 thicknesses, K1 & K2 are coefficient thermal conductivity of plate1 & Plate2 respectively. But here L1 = L2 = L (say) Then K = L+L/(L/K1 + L/K2) = 2K1K2K1+K2
प्र: मानव मस्तिष्क के निम्नलिखित में से किस भाग में सेरेब्रम होता है?
1901 060920fcd875ac251e1a31f7f
60920fcd875ac251e1a31f7f- 1मध्य मस्तिस्कfalse
- 2पश्च मस्तिस्कfalse
- 3अग्र मस्तिस्कtrue
- 4उपरोक्त में से कोई नहींfalse
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उत्तर : 3. "अग्र मस्तिस्क "
प्र: The ratio of investments of two partners A and B is 7:5 and the ratio of their profits is 7:10. If A invested the money for 5 months, find for how much time did B invest the money ? 1901 05b5cc6dfe4d2b4197774eaf3
5b5cc6dfe4d2b4197774eaf3- 111 monthsfalse
- 29 monthsfalse
- 37 monthsfalse
- 410 monthstrue
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उत्तर : 4. "10 months"
व्याख्या :
Answer: D) 10 months Explanation: 7x5: 5xk = 7:10k = 10 months
प्र: Which of the following is not an intensive property? 1901 05b5cc6ade4d2b4197774d139
5b5cc6ade4d2b4197774d139- 1Weighttrue
- 2Densityfalse
- 3Refractive indexfalse
- 4Melting pointfalse
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उत्तर : 1. "Weight"
व्याख्या :
Answer: A) Weight Explanation: An intensive property is a physical quantity whose value does not depend on the amount of the substance for which it is measured. For example, the temperature of a system in thermal equilibrium is the same as the temperature of any part of it. If the system is divided the temperature of each subsystem is identical. The same applies to the density of a homogeneous system, if the system is divided in half, the mass and the volume change in the identical ratio and the density remains unchanged. Additionally, the boiling point of a substance is another example of an intensive property. For example, the boiling point for water is 100 °C at a pressure of one atmosphere, a fact which remains true regardless of quantity.
प्र: Which of the following substances undergo ‘sublimation’ on heating 1.Iodine 2.Napthalene 3.Camphor 1901 15cc94a8ee1609b6461ac9801
5cc94a8ee1609b6461ac9801- 11 and 2false
- 21 and 3false
- 32 and 3false
- 4all of themtrue
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उत्तर : 4. "all of them"
प्र: जय जवान, जय किसान का नारा किसने दिया था?
1901 0609a66adf738a51c29ae29b0
609a66adf738a51c29ae29b0- 1लाल बहादुर शास्त्रीtrue
- 2चन्द्रशेखर आजादfalse
- 3चरण सिंहfalse
- 4भगत सिंहfalse
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उत्तर : 1. "लाल बहादुर शास्त्री"
व्याख्या :
भारत के दूसरे प्रधान मंत्री लाल बहादुर शास्त्री ने पहली बार वर्ष 1965 में दिल्ली के रामलीला मैदान में एक सार्वजनिक सभा में भाषण देते हुए "जय जवान जय किसान" का नारा दिया था।
प्र: यदि A, '-' का प्रतिनिधित्व करता है और C, '×' का प्रतिनिधित्व करता है, D '÷' का प्रतिनिधित्व करता है, और E '+' का प्रतिनिधित्व करता है, तो 14 C 3 A 12 E 4 D 2 का मान =?
1901 0601d1640552e5f41f7ba4783
601d1640552e5f41f7ba4783- 16false
- 217false
- 328false
- 432true
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उत्तर : 4. "32"
प्र: A certain job was assigned to a group of women to do it in 20 days. But 12 women did not turn up for the job and the remaining did the job in 32 days. The original number of women in the group was? 1900 05b5cc6bae4d2b4197774d794
5b5cc6bae4d2b4197774d794- 136false
- 232true
- 322false
- 428false
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उत्तर : 2. "32"
व्याख्या :
Answer: B) 32 Explanation: Let the total women in the group be 'W' Then according to the given data, W x 20 = (W-12) x 32 => W = 32 Therefore, the total number of women in the group = 32