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प्र: Is water a Pure substance? 911 0

  • 1
    TRUE
    सही
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  • 2
    FALSE Answer & Explanation Answer:
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उत्तर : 1. "TRUE"
व्याख्या :

Answer: A) TRUE Explanation: True, Water is a Pure substance and not a mixture.   We know that, A mixture is when two or more substances combine physically together. You can find that the mixture retains the properties of the original components. In water, two hydrogen atoms combine with one oxygen atom chemically, forming a new substance that has properties different from hydrogen alone or oxygen alone.   Therefore, water is not a mixture; it is a compound and it is pure.

प्र: Find at what time between 9 and 10 o’clock will the hands of a clock be in 180° ? 906 0

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    180/14 min past 10
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  • 2
    180/11 min past 9
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  • 3
    148/7 min past 10
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  • 4
    154/11 min past 9
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उत्तर : 2. "180/11 min past 9"
व्याख्या :

Answer: B) 180/11 min past 9 Explanation: At 9 o’clock, the hour hand is at 9 and the minutes hand is at 12, i.e., the two hands are 15 min. spaces apart.So, the minute hand should gain = (30 - 15) minutes = 15 minutes55 minutes will be gained in 60 min.15 minutes spaces will be gained in ((60/55) x 15) min. = 180/11 min.The hands will be in the same straight line but not together i.e.,in 180 degrees at 180/11 min. past 9.

प्र: There are 3 sections with 5 questions each. If four questions are selected from each section, the chance of getting different questions is ? 906 0

  • 1
    1000
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  • 2
    625
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  • 3
    525
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  • 4
    125
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उत्तर : 4. "125"
व्याख्या :

Answer: D) 125 Explanation: Methods for selecting 4 questions out of 5 in the first section = 5 x 4 x 3 x 2 x 1/4 x 3 x 2 x 1 = 5. Similarly for other 2 sections also i.e 5 and 5 So total methods = 5 x 5 x 5 = 125.

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उत्तर : 3. "Any two of (1, 2 & 3)"
व्याख्या :

Answer: C) Any two of (1, 2 & 3) Explanation: Using Both 1 & 2 statements we get the rate of interest as in (1) we have given principle amount and in (2) compound interest for 2 years. By this data we get the rate%. Using Both 1 & 3 statements we can get the rate% as we have principle amount & difference between compound interest and simple interest in 2 years. Using Both 2 & 3 statements we get compound interest & simple interest by which we get principle amount. So that we can calculate %rate. Hence by using any two of the three statements(1,2&3) we get rate of interest.

प्र: Find the length of a train if it takes 10 seconds to cross a pole and double of this time to cross a platform of length 200 mts ? 880 0

  • 1
    180 mts
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  • 2
    190 mts
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  • 3
    200 mts
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  • 4
    210 mts
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उत्तर : 3. "200 mts"
व्याख्या :

Answer: C) 200 mts Explanation: Let the length of the train be 'L' mts let the speed of the train be 'S' m/s Given it crosses a pole in 10 sec=> L/S = 10 ......(1)Given it takes 20 sec (double of pole) to cross a platform of length 200 mts => (L + 200)/S = 20 => L/S + 200/S = 20 But from (1) L/S = 10 => 200/S = 20 - 10 => S = 20 m/s Then, from (1) => L = 10 x 20 = 200 mts. Hence, the length of the train = 200 mts.

प्र: 40% of 80? 874 0

  • 1
    36
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  • 2
    32
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  • 3
    42
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  • 4
    44
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उत्तर : 2. "32"
व्याख्या :

Answer: B) 32 Explanation: Here 40% of 80 is given as 40100 x 80 = 8 x 4 = 32

प्र: How do you make the number one disappear? 867 0

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उत्तर :
व्याख्या :

Add the letter 'G' to the word 'ONE' and it become's 'Gone' which means disappear.

प्र: I have three eyes but only one leg. I still close one even if you beg.  What am I? 866 0

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उत्तर :
व्याख्या :

A traffic light. It has three 'eyes' (the red, orange and green lights) and the leg is the pole holding it up. Many people beg the light to stay green as they’re approaching.

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