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नवीनतमलोकप्रियमूल्यांकनपेज देखें 5931 of 6017कुल सवाल 48131 जॉइन Examsbook

प्र: A periscope works by the principle of 3235 0

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    Total internal reflection
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    Refraction
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    Diffraction
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    Reflection & Refraction
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उत्तर : 1. "Total internal reflection"
व्याख्या :

Answer: A) Total internal reflection Explanation: A periscope is an optical instrument that uses a system of prisms, lenses, or mirrors to reflect images through a tube.       Light from a distant object strikes the top mirror and is then reflected at an angle of 90 degrees down the periscope tube. At the bottom of the periscope, the light strikes another mirror and is then reflected into the viewer’s eye.   Hence, A periscope works by the principle of Total internal reflection.

प्र: The law of demand states that other things equal 1539 0

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    as the price increases, the quantity demanded will decrease.
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    as the price increases, the quantity demanded will increase.
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    as the price decreases, the demand curve will shift to the right.
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    as the price increases, the demand will decrease.
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उत्तर : 1. "as the price increases, the quantity demanded will decrease."
व्याख्या :

Answer: A) as the price increases, the quantity demanded will decrease. Explanation:

प्र: What was the final score of the super bowl 2018? 1332 0

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    33
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    43
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    41
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    38
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उत्तर : 3. "41"
व्याख्या :

Answer: C) 41 Explanation: The Super Bowl is the annual championship game of the National Football League (NFL). In Super bowl 2018, the Eagles secured a 41-33 victory, and the celebration of the franchise's first Super Bowl victory was on.

प्र: Which would provide the body with the most energy? 2489 0

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    Breaking a single carbon bond
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    Forming bonds between two amino acids
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    Creating bonds to form a carbohydrate
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    Breaking the bonds in a monosaccharide
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उत्तर : 4. "Breaking the bonds in a monosaccharide"
व्याख्या :

Answer: D) Breaking the bonds in a monosaccharide Explanation:

प्र: In which layer is the pressure the highest? 1535 0

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    Ionosphere
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    Stratosphere
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    Troposphere
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    Inner core
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उत्तर : 4. "Inner core"
व्याख्या :

Answer: D) Inner core Explanation: "Pressure" is the ratio of mass to area. So, for any given area, the one with more mass pressing on it will experience a higher pressure.   As you go more deeply into the atmosphere OR earth itself, you are putting more and more mass over you. For the same unit area therefore, the pressure, (mass/area) increases.   Hence, the lowest layer will always have the highest pressure i.e, inner core.

प्र: One year ago the ratio between Maneela’s and Shanthi’s salary was 3 : 4. The ratios of their individual salaries between last year’s and this year’s salaries are 4 : 5 and 2 : 3 respectively. At present the total of their salary is Rs. 4160. The salary of Maneela, now is? 6020 0

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    Rs. 1600
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    Rs. 1700
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    Rs. 1800
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    Rs. 1900
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उत्तर : 1. "Rs. 1600"
व्याख्या :

Answer: A) Rs. 1600 Explanation: Let the salaries of Maneela and Shanthi one year before be M1, S1 & now be M2, S2 respectively. Then, from the given data, M1/S1 = 3/4  .....(1) M1/M2 = 4/5 .....(2) S1/S2 = 2/3  .....(3) and M2 + S2 = 4160  .....(4)   Solving all these eqtns, we get M2 = Rs. 1600.

प्र: Mohan spends 23% of an amount of money on an insurance policy, 33% on food, 19% on children’s education and 16% on recreation. He deposits the remaining amount of Rs. 504 in bank. How much amount does he spend on food and insurance policy together? 1443 0

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    Rs. 2326
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    Rs. 5876
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    Rs. 1741
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    Rs. 3136
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उत्तर : 4. "Rs. 3136"
व्याख्या :

Answer: D) Rs. 3136 Explanation: Let total amount = Rs. P Total expenditure = (23 + 33 + 19 + 16)% of P = 91%ofP Remaining money = (100 - 91)% of P = 9% of P But given in the question that, 9% of P = 504 9p/100 = 504 => P = 50400/9 => P = Rs. 5600   Required money spent on Food & Insurance = 23 + 33 % = 56% of 5600 = 56 x 5600/100 = 56 x 56 = Rs. 3136

प्र: Hormones are chemicals secreted and regulated by the endocrine system. 1365 0

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    TRUE
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    FALSE Answer & Explanation Answer:
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उत्तर : 1. "TRUE"
व्याख्या :

Answer: A) TRUE Explanation: True. Hormones are chemicals secreted and regulated by the endocrine system.

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