IIT JEE प्रश्न और उत्तर का अभ्यास करें
8प्र: Air pressure is measured in which of the following units? 1551 05b5cc694e4d2b4197774c47a
5b5cc694e4d2b4197774c47a- 1Steridianfalse
- 2kg/mtsfalse
- 3Newtonfalse
- 4Pascaltrue
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उत्तर : 4. "Pascal"
व्याख्या :
Answer: D) Pascal Explanation: Pressure = (Net Force) / (Applied area) = Newton / square meters Measuring units of pressure are: . Pascal. Bar. Torr. Pounds per square inch (psi). Standard atmosphere (atm).
प्र: A ball is thrown vertically upward from the ground. It crosses a point at the height of 25 m twice at an interval of 4 seconds. The ball was thrown with the velocity of 1550 05b5cc6a6e4d2b4197774cda7
5b5cc6a6e4d2b4197774cda7- 118 m/sfalse
- 225 m/sfalse
- 330 m/strue
- 436 m/sfalse
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उत्तर : 3. "30 m/s"
व्याख्या :
Answer: C) 30 m/s Explanation: The interval between object pass the same point is 4 sec. That means in 2 sec, object reaches the top and in next 2 sec, it again reaches the same point. By the info given, we can find the velocity of that point by using : v=u+(-gt) 0= u - 10×2 u = 20 Then the velocity at 25m is 20m/sec. so the initial velocity is -v2 = u2 + (-2gh)400 = u2 - 2x 10 x 25u2 = 900 => u = 30 m/s
प्र: A merchant commences with a certain capital and gains annually at the rate of 30 per cent. At the end of 2 years he has worth Rs 10,000. What was the original capital? 1550 05b5cc6abe4d2b4197774cfb2
5b5cc6abe4d2b4197774cfb2- 1Rs. 4987false
- 2Rs. 5148false
- 3Rs. 5917true
- 4Rs. 6254false
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उत्तर : 3. "Rs. 5917"
व्याख्या :
Answer: C) Rs. 5917 Explanation: Let the Original capital amount be Rs. P Given after 2 years the amount is Rs. 10000 Rate of interest = 30% According to the question, P x 130100 x 130100 = 10000=> P = 1000000169 = 5917 Therefore, the capital amount P = Rs. 5917
प्र: LCD of 12 and 18 1550 05b5cc6b8e4d2b4197774d66b
5b5cc6b8e4d2b4197774d66b- 136true
- 242false
- 312false
- 46false
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उत्तर : 1. "36"
व्याख्या :
Answer: A) 36 Explanation: LCD is nothing but Lowest or Least Common Denominator Here LCD of 12 and 18 means LCD of two fractions with denominators 12 and 18 respectively. Therefore, LCM of 12 & 18 = 6 x 3 x 2 = 36 How to calculate LCD :: The lowest common denominator or least common denominator (LCD) is the least common multiple (LCM) of the denominators of a set of fractions.
प्र: When all the students in a school are made to stand in rows of 54, 30 such rows are formed. If the students are made to stand in rows of 45, how many such rows will be formed ? 1549 05b5cc736e4d2b4197774f88d
5b5cc736e4d2b4197774f88d- 122false
- 236true
- 332false
- 426false
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उत्तर : 2. "36"
व्याख्या :
Answer: B) 36 Explanation: Total number of students = 54 x 30When arranged in rows of 45, number of rows formed are, 54x3045 = 36.
प्र: If 2 men and 3 women can do a piece of work in 8 days and 3 men and 2 women in 7 days. In how many days can the work be done by 5 men and 4 women working together? 1549 05b5cc6bde4d2b4197774d924
5b5cc6bde4d2b4197774d924- 13 daysfalse
- 26 daysfalse
- 34 daystrue
- 42 daysfalse
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उत्तर : 3. "4 days"
व्याख्या :
Answer: C) 4 days Explanation: From the given data, => (2 M + 3W) 8 = (3M + 2W)7 => 16M + 24W = 21M + 14 W => 10W = 5M => 2W = M => 14W × ? = 7W × 8 ? = 4 days
प्र: The main result of aerobic respiration is the 1549 05b5cc632e4d2b4197774b9ae
5b5cc632e4d2b4197774b9ae- 1production of lactic acid as an end productfalse
- 2production of ATP from the breakdown of glucosetrue
- 3conversion of radiant energy into chemical energyfalse
- 4storage of energy in a polysaccharidefalse
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उत्तर : 2. "production of ATP from the breakdown of glucose"
व्याख्या :
Answer: B) production of ATP from the breakdown of glucose Explanation: The three steps within the aerobic respiration process are glycolysis, the citric acid cycle, and oxidative phosphorylation. Photosynthesis builds glucose, and what was built in photosynthesis is broken down during aerobic respiration. Hence, production of ATP from the breakdown of glucose is the main result of aerobic respiration.
प्र: The More You Have, The Less You See. What is it? 1548 05b5cc6b0e4d2b4197774d2a2
5b5cc6b0e4d2b4197774d2a2- 1Lightfalse
- 2Darknesstrue
- 3Sightfalse
- 4Nonefalse
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उत्तर : 2. "Darkness"
व्याख्या :
Answer: B) Darkness Explanation: The More You Have the Darkness, The Less You See i.e, visible less.