प्रश्न और उत्तर का अभ्यास करें
8प्र: The Ozone Layer restricts from 4739 05b5cc6b7e4d2b4197774d633
5b5cc6b7e4d2b4197774d633- 1Infrared Raysfalse
- 2Radio wavesfalse
- 3Ultraviolet Radiationtrue
- 4X-Rays and Gamma Raysfalse
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उत्तर : 3. "Ultraviolet Radiation"
व्याख्या :
Answer: C) Ultraviolet Radiation Explanation: The Ozone layer which is present in the Earth's atmosphere protects it by restricting from UV or Ultraviolet radiation, the dangerous rays contained by Sun.
प्र: रतन एक काम को \(5-{1-\over-2}\) दिन में करता है जबकि रूपेश इसी काम को \(10-{1-\over-2}\)दिन में समाप्त करता है। दोनों मिलकर उसकी काम को कितने दिन में समाप्त करेंगे? 4739 25d147c239aeb0a08f1e67215
5d147c239aeb0a08f1e67215- 1\(3 {39 \over 64 }\)true
- 2\(4 {39 \over 64 }\)false
- 3\(5 {39 \over 64 }\)false
- 4\(6 {39 \over 64 }\)false
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उत्तर : 1. "\(3 {39 \over 64 }\) "
प्र: Early morning after sunrise, Karthik was standing infront of his house in such a way that his shadow was falling exactly behind him. He starts walking straight and walks 5 metres. He turns to his left and walks 3 metres and again turning to his left walks 2 metres. Now in which direction is he from his starting point? 4739 05b5cc705e4d2b4197774f211
5b5cc705e4d2b4197774f211- 1Westfalse
- 2North-Easttrue
- 3Eastfalse
- 4South-Westfalse
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उत्तर : 2. "North-East"
व्याख्या :
Answer: B) North-East Explanation: Early morning suns rise at east, if his shadow falls exactly behind him that means he is facing towards east. now he walks 5mt towards east, then he turns left that means he facing towards north and walk 3mt and if he turn left then he is facing towards west and he walk only 3 kms thats why man is in north east direction from starting point.
प्र: 510 रु. में 30 संतरे और 75 सेब खरीदे गए यदि सेब का दाम 2 रु० प्रति सेब था, तो संतरे का औसत दाम था
4739 063285afb8146e66c29925ab4
63285afb8146e66c29925ab4- 1रु० 10false
- 2रु० 15false
- 3रु० 12true
- 4रु० 14false
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उत्तर : 3. "रु० 12"
प्र: Which action is the best example of a direct observation? 4738 05b5cc66de4d2b4197774bfaa
5b5cc66de4d2b4197774bfaa- 1listening to a cricket chirp at night and counting the number of chirps per minutetrue
- 2determining the seal population of an island by counting seals in 10 square meters of the islandfalse
- 3identifying which bird was present by the tracks that it leaves in the sand at a beachfalse
- 4reading numbers on a heat sensor to conclude that there is a deer in the night woodsfalse
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उत्तर : 1. "listening to a cricket chirp at night and counting the number of chirps per minute"
व्याख्या :
Answer: A) listening to a cricket chirp at night and counting the number of chirps per minute Explanation:
प्र: कम्प्यूटरों में प्रयुक्त आई. सी. चिप बनते हैं ?
4734 15f644620a372fb536711a238
5f644620a372fb536711a238- 1क्रोमियमfalse
- 2आयरन औकसाइडfalse
- 3सिल्वरfalse
- 4सिलिकॉनtrue
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उत्तर : 4. "सिलिकॉन "
प्र: A, B, C, D, E, F and G are members of a family consisting of four adults and three children, two of whom, F and G are girls. A and D are brothers and A is a doctor. E is an engineer married to one of the brothers and has two children. if is married to D and G is their child. Who is C ? 4729 05c2ddcc894bba731de8f0ad2
5c2ddcc894bba731de8f0ad2- 1F's fatherfalse
- 2E's daughterfalse
- 3A's sontrue
- 4G's brotherfalse
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उत्तर : 3. "A's son"
प्र: The Indian to beat the computers in mathematical wizardry is 4728 05b5cc6a2e4d2b4197774cb66
5b5cc6a2e4d2b4197774cb66- 1Shakuntala Devitrue
- 2Raja Ramannafalse
- 3Rina Panigrahifalse
- 4Ramanujamfalse
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उत्तर : 1. "Shakuntala Devi"
व्याख्या :
Answer: A) Shakuntala Devi Explanation: