Practice Question and Answer
8Q: Statement 1: Elizabeth has four children.Statement 2: Two of the children have blue eyes and two of the children have brown eyes.Statement 3: Half of the children are girls.If the first three statements are facts, which of the following statements must also be a fact? a. At least one girl has blue eyes.b. Two of the children are boys.c. The boys have brown eyes. 2146 05b5cc76ae4d2b4197774fe84
5b5cc76ae4d2b4197774fe84- 1a onlyfalse
- 2a and bfalse
- 3b onlytrue
- 4b and cfalse
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Answer : 3. "b only"
Explanation :
Answer: C) b only Explanation: Since half of the four children are girls, two must be boys. It is not clear which children have blue or brown eyes. So only statement (b) follows.
Q: Multiplicative inverse of 0 2146 05b5cc651e4d2b4197774bce5
5b5cc651e4d2b4197774bce5- 10false
- 21false
- 3infinityfalse
- 4None of the abovetrue
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Answer : 4. "None of the above"
Explanation :
Answer: D) None of the above Explanation: In the real numbers, zero does not have a reciprocal because no real number multiplied by 0 produces 1 (the product of any number with zero is zero). Hence, 0 doesn't have any multiplicative inverse.
Q:निर्देश : यहाँ दिया गया दण्ड आलेख विभिन्न जनगणना वर्षों में भारत की जनसंख्या (करोड़ में) को दर्शाता है । आलेख को ध्यानपूर्वक देखिए तथा इस पर आधरित प्रश्नों के उत्तर दीजिए।
किस जनगणना वर्ष में उससे ठीक पहले वाले जनगणना वर्ष की तुलना में जनसंख्या में प्रतिशत वृद्धि सबसे कम है?
2146 05ea811ae3b50714be9b1d5c9
5ea811ae3b50714be9b1d5c9- 11961false
- 21951true
- 31971false
- 41941false
- 5इनमें से कोई नहींfalse
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Answer : 2. "1951 "
Q: रोगजनक बैक्टीरिया का स्राव किसके द्वारा होता है ?
2146 15f4cd595081699374e810e4e
5f4cd595081699374e810e4e- 1हार्मोनfalse
- 2इंटरफेरॉनfalse
- 3प्रतिजनtrue
- 4प्रतिरक्षीfalse
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Answer : 3. "प्रतिजन "
Q: A boy is swinging a ball attached to a string in a horizontal circle.If the string snaps 2146 05b5cc7b6e4d2b41977750923
5b5cc7b6e4d2b41977750923- 1the ball will travel towards the center of the circle and fall downfalse
- 2it will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall downtrue
- 3it will fall down at the same place where the string breaksfalse
- 4none of thesefalse
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Answer : 2. "it will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down"
Explanation :
Answer: B) it will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down Explanation: The centripetal force having been removed the body cannot execute the curved path. (B) is Correct.
Q: भक्त तुकाराम कौन-से मुगल सम्राट के समकालीन थे ?
2146 060a5c36deb4d147142b9c787
60a5c36deb4d147142b9c787- 1अकबरfalse
- 2जहाँगीरtrue
- 3औरंगजेबfalse
- 4बाबरfalse
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Answer : 2. "जहाँगीर"
Q: किस राज्य सरकार ने 15 अगस्त,2019 को 73 वें स्वतंत्रता दिवस पर ऑनलाइन राजस्व भुगतान प्रणाली शुरू की है
2146 05da6d6146e9c8d68fb890cc0
5da6d6146e9c8d68fb890cc0- 1ओडिशाtrue
- 2पश्चिम बंगालfalse
- 3उत्तराखंडfalse
- 4बिहारfalse
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Answer : 1. "ओडिशा"
Q:Read the passage carefully and choose the best answer to each question out of the four alternatives.
The problem of water pollution by pesticides can be understood only in context, as part of the world to which it belongs- the pollution of the total environment of making. The pollution entering our waterways comes from many sources, radioactive wastes from reactors, laboratories, and hospitals; fallout from nuclear explosions; domestic wastes from cities and towns; chemical wastes from factories. To these is added a new kind of fallout the chemical sprays applied to crop lands and gardens, forests and fields. Many of the chemical agents in this alarming melange initiate and augment the harmful effects of radiation, and within the group of chemicals themselves there are sinister and little- understood interactions, transformations, and summations of effect.
Even since the chemists began to manufacture substances that nature never invented, the problems of water purification have become complex and the danger to user of water has increased. As we have seen, the production of these synthetic chemicals in large volume begin in the 1940’s. It has now reached such proportion that an appalling deluge of chemical pollution is daily poured into the nation’s waterways. When inextricably mixed with domestic and other wastes discharged into the same water, these chemicals sometimes defy detection by the methods in ordinary use by purification plants. Most of them are so complex that they cannot be identified. In rivers, a really incredible variety of pollutants combine to produce deposits that sanitary engineers can only despairingly refer to as “gunk”.
water contamination has become serious.
2146 05dafe1557f47a948b611e650
5dafe1557f47a948b611e650The problem of water pollution by pesticides can be understood only in context, as part of the world to which it belongs- the pollution of the total environment of making. The pollution entering our waterways comes from many sources, radioactive wastes from reactors, laboratories, and hospitals; fallout from nuclear explosions; domestic wastes from cities and towns; chemical wastes from factories. To these is added a new kind of fallout the chemical sprays applied to crop lands and gardens, forests and fields. Many of the chemical agents in this alarming melange initiate and augment the harmful effects of radiation, and within the group of chemicals themselves there are sinister and little- understood interactions, transformations, and summations of effect.
Even since the chemists began to manufacture substances that nature never invented, the problems of water purification have become complex and the danger to user of water has increased. As we have seen, the production of these synthetic chemicals in large volume begin in the 1940’s. It has now reached such proportion that an appalling deluge of chemical pollution is daily poured into the nation’s waterways. When inextricably mixed with domestic and other wastes discharged into the same water, these chemicals sometimes defy detection by the methods in ordinary use by purification plants. Most of them are so complex that they cannot be identified. In rivers, a really incredible variety of pollutants combine to produce deposits that sanitary engineers can only despairingly refer to as “gunk”.
- 1Since water pollution was difficult to assesfalse
- 2Since nature has taken a hand in pollutionfalse
- 3Since chemists began to use new substancetrue
- 4since businessmen authorised the use of chemicalsfalse
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