Aptitude miscellaneous
- A piece of cloth measured with a metre stick, one cm short, is 100 metres long. Reckoning the metre stick as being right, the actual length of the cloth (in cm) is
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As per the given in question ,
∵ 1 metre ≡ 99 cm
∴ 100 metre ≡ 9900 cmCorrect Option: B
As per the given in question ,
∵ 1 metre ≡ 99 cm
∴ 100 metre ≡ 9900 cm
Hence , option B is correct answer .
- If a clock strikes appropriate number of times at each hour, how many times will it strike a day ?
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As we know that ,
∵ Sum of first n natural no.s = n(n + 1) 2
Here , n = 12
Required answer = 2 (1 + 2 + 3 + ..... + 12)
Correct Option: B
As we know that ,
∵ Sum of first n natural no.s = n(n + 1) 2
Here , n = 12
Required answer = 2 (1 + 2 + 3 + ..... + 12)Required answer = 2 × 12 ×13 = 156 2
- A wall-clock takes 9 seconds in tringing at 9 O’clock. The time, it will take in tringing at 11 O’clock, is
[Note : The wall-clock trings 9 times at 9 O’clock and 11 times at 11 O’clock.]
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we can say that the wall-clock trings 9 times at 9 O’clock and 11 times at 11 O’clock .
Correct Option: B
we can say that the wall-clock trings 9 times at 9 O’clock and 11 times at 11 O’clock .
So , A wall-clock takes 9 seconds in tringing at 9 O’clock. The time, it will take in tringing at 11 O’clock, is 11 seconds .
- For a certain month, the dates of three of the Sundays are even numbers. Then, the 15th of that month falls on a
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If a sunday lies on 2nd of a month, other sundays will lie on 9, 16, 23, 30.
Correct Option: C
If a sunday lies on 2nd of a month, other sundays will lie on 9, 16, 23, 30.
Hence, 15th will fall on Saturday.
- There are 222 red balls in a basket. A boy takes out 6 red balls from it and replaces them by 12 white balls. He continues to do so till all the red balls are replaced by white balls. Determine the number of white balls put in the basket.
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According to question ,
6 red balls ≡ 12 white balls∴ 1 red ball ≡ 12 6 ∴ 222 red balls ≡ 12 × 222 6
Correct Option: A
According to question ,
6 red balls ≡ 12 white balls∴ 1 red ball ≡ 12 6 ∴ 222 red balls ≡ 12 × 222 6
Hence , 222 red balls = 444 white balls
