IIT JEE प्रश्न और उत्तर का अभ्यास करें
8प्र: The coldest planet in the solar system is ? 1833 05b5cc723e4d2b4197774f663
5b5cc723e4d2b4197774f663- 1Venusfalse
- 2Jupiterfalse
- 3Uranustrue
- 4Plutofalse
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उत्तर : 3. "Uranus"
व्याख्या :
Answer: C) Uranus Explanation:
प्र: 88 cubic centimetres of silver is drawn into a wire 1 mm in diameter. The length of the wire in metres will be ? 1777 05b5cc723e4d2b4197774f659
5b5cc723e4d2b4197774f659- 1112 mtsfalse
- 284 mtstrue
- 396 mtsfalse
- 4108 mtsfalse
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उत्तर : 2. "84 mts"
व्याख्या :
Answer: B) 84 mts Explanation: Vol of silver = πR2h = 66 C.C Given D= 1mm => R = D/2 = 1/20 cm => 227×1202×h = 66 = 66 x 400 x (7/22) = 8400 cm = 84 mtrs.
प्र: What is the least number of squares tiles required to pave the floor of a room 15 m 17 cm long and 9 m 2 cm broad ? 1080 05b5cc723e4d2b4197774f65e
5b5cc723e4d2b4197774f65e- 1844false
- 2814true
- 3840false
- 4820false
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उत्तर : 2. "814"
व्याख्या :
Answer: B) 814 Explanation: Length of largest tile = H.C.F. of 1517 cm and 902 cm = 41 cm.Area of each tile = (41 x 41) sq.cm Required number of tiles =1517 x 902/(41 x 41) = 814.
प्र: Statement: The experts group on Technical Education has stressed that Computer Education should be provided to children from primary school itself. It should be implemented in urban and rural school, simultaneously. Courses of action:a) Government should issue instructions to all school for Computer Education.b) At least one teacher of each school should be trained in Computer operations for teaching children. 5052 05b5cc723e4d2b4197774f654
5b5cc723e4d2b4197774f654- 1Both a and b followstrue
- 2Only a followsfalse
- 3Only b followsfalse
- 4Neither a nor b followsfalse
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उत्तर : 1. "Both a and b follows"
व्याख्या :
Answer: A) Both a and b follows Explanation: Both are the right courses of action for effective implementation of Computer Education at primary level urban and rural schools.
प्र: A wheel that has 6 cogs is meshed with a larger wheel of 14 cogs. When the smaller wheel has made 21 revolutions, then the number of revolutions made by the larger wheel is ? 1629 05b5cc720e4d2b4197774f640
5b5cc720e4d2b4197774f640- 111false
- 27false
- 39true
- 413false
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उत्तर : 3. "9"
व्याख्या :
Answer: C) 9 Explanation: Here the number of cogs is inveresly proportional to number of revolutions => More cogs less revolution=> 6 : 14 :: x : 21=> (21x6)/14 = 9
प्र: The marked price of a Watch is Rs.8400. It is to be sold at Rs.6896 at two successive discounts. If the first discount is 12%, the second discount is ? 1683 05b5cc720e4d2b4197774f627
5b5cc720e4d2b4197774f627- 17.2 %false
- 29.14 %false
- 37.13 %false
- 46.709 %true
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उत्तर : 4. "6.709 %"
व्याख्या :
Answer: D) 6.709 % Explanation: (100-x)% of 88% of 8400 = 6896 => 100-x10088100x8400 = 6896 => x = 6.709%
प्र: A person walking 6/7 of his usual rate is 30 minutes late. What is his usual time ? 1250 05b5cc720e4d2b4197774f62c
5b5cc720e4d2b4197774f62c- 12 hrs 50 minfalse
- 23 hrs 25 minfalse
- 33 hrstrue
- 42 hrs 5 minfalse
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उत्तर : 3. "3 hrs"
व्याख्या :
Answer: C) 3 hrs Explanation: Let t be the usual time. If the usual rate is 1 unit, then the unusual rate is 6/7.Balance by the distance,1 x t = (6/7)(t + 30)7t = 6(t + 30)we get t as,t = 180 minutes = 3 hrs.
प्र: The reflex angle between the hands of a clock at 11:35 is ? 2097 05b5cc720e4d2b4197774f622
5b5cc720e4d2b4197774f622- 1137.5 degreesfalse
- 2222.5 degreestrue
- 3192.5 degreesfalse
- 4330 degreesfalse
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उत्तर : 2. "222.5 degrees"
व्याख्या :
Answer: B) 222.5 degrees Explanation: Apply the formula for finding the angle:Angle=(30h-(11/2)m( where m stands for minutes and h stands for hours)Hence, 30x11 - 11/2x35 = 330 - 192.5 = 137.5 degreesThe reflex angle = 360 - 192.5 degree = 222.5 degrees.