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8प्र: Mg+O2=MgO Balance the above Chemical equation? 1757 05b5cc6b1e4d2b4197774d2ea
5b5cc6b1e4d2b4197774d2ea- 12Mg + O2 ----> 2MgOtrue
- 22Mg + O ----> 2MgOfalse
- 32Mg + O ----> MgO2false
- 42Mg + O2 ----> MgO2false
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उत्तर : 1. "2Mg + O2 ----> 2MgO"
व्याख्या :
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.
प्र: Highest Bridge in the world 1757 05b5cc6bbe4d2b4197774d82f
5b5cc6bbe4d2b4197774d82f- 1Millau Viaductfalse
- 2Sidu River Bridgefalse
- 3Bailey Bridgetrue
- 4Nonefalse
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उत्तर : 3. "Bailey Bridge"
व्याख्या :
Answer: C) Bailey Bridge Explanation: The Highest bridge in the world is Bailey bridge. It is located in the Ladakh valley between Dras and Suru rivers in the Himalayan mountains. It was built by the Indian Army in August 1982. It is 30 meters (98 ft) long and is at an altitude of 5,602 meters (18,379 ft) above sea level.
प्र: If [P @ Q] means [P is wife of Q], [P+Q] means [P is father of Q] and [P - Q] means [P is sister of Q] then in [G+ H - R @ D], how is G related to D ? 1756 05b5cc715e4d2b4197774f422
5b5cc715e4d2b4197774f422- 1Son-in-lawfalse
- 2Grand fatherfalse
- 3Father-in-lawtrue
- 4Brotherfalse
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उत्तर : 3. "Father-in-law"
व्याख्या :
Answer: C) Father-in-law Explanation: "G is father in law of D"G+H means G is father of HH is either son or daughter of GH-R means H is sister of RR@D means R is wife of Dso H and R are sistersand daughters of Gso husband of R i.e. D is son in law of Gor G is father in law of D
प्र: First Bank to introduce ATM in India is ? 1756 05b5cc711e4d2b4197774f3fa
5b5cc711e4d2b4197774f3fa- 1ICICI Bankfalse
- 2HSBC Banktrue
- 3HDFC Bankfalse
- 4YES Bankfalse
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उत्तर : 2. "HSBC Bank"
व्याख्या :
Answer: B) HSBC Bank Explanation: HSBC (Hongkong and Shanghai Banking Corporation) is the first bank to introduce ATM concept in India in the year 1987 in Mumbai.
प्र: A watch which gains uniformly is 2 minutes low at noon on Tuesday and is 4 min 48 sec fast at 2 p.m. on the following Tuesday. When was it correct ? 1754 05b5cc761e4d2b4197774fd0c
5b5cc761e4d2b4197774fd0c- 112 p.m. on Wednesdayfalse
- 22 p.m. on Thursdaytrue
- 33 p.m. on Thursdayfalse
- 42 p.m. on Wednesdayfalse
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उत्तर : 2. "2 p.m. on Thursday"
व्याख्या :
Answer: B) 2 p.m. on Thursday Explanation: Time from 12 p.m. on Tuesday to 2 p.m. on the following Tuesday = 7 days 2 hours.= 170 hours.The watch gains = (2 + 4 x 4/5) min= 34/5 min. in 170 hrs.Now, 34/5 min are gained in 170 hrs.Then, 2 min are gained in (170 x 5/34 x 2) hrs.Watch is correct after 2 days 2 hrs after 12 p.m. on Tuesday, i.e., it will be correct at 2 p.m. on Thursday.
प्र: 45 men working 9 hours per day dig 40 m deep. How many extra men should be put to dig to a depth of 56 m working 7 hours per day ? 1752 05b5cc6dae4d2b4197774e8c8
5b5cc6dae4d2b4197774e8c8- 136true
- 261false
- 348false
- 454false
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उत्तर : 1. "36"
व्याख्या :
Answer: A) 36 Explanation: (45 x 9)/40 = (M x 7)/56 => M = 81 => 81 – 45 = 36
प्र: 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. 1752 05b5cc76ae4d2b4197774fe84
5b5cc76ae4d2b4197774fe84- 1a onlyfalse
- 2a and bfalse
- 3b onlytrue
- 4b and cfalse
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उत्तर : 3. "b only"
व्याख्या :
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.
प्र: What is the smallest number by which 2880 must be divided in order to make it into a perfect square ? 1752 05b5cc74fe4d2b4197774fb0d
5b5cc74fe4d2b4197774fb0d- 12false
- 23false
- 34false
- 45true
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उत्तर : 4. "5"
व्याख्या :
Answer: D) 5 Explanation: By trial and error method, we get2880/3 = 960 is not a perfect square2880/4 = 720 is not a perfect square2880/5 = 576 which is perfect square of 24Hence, 5 is the least number by which 2880 must be divided in order to make it into a perfect square.