A father tells his son, “I was of your present age when you were born”. If the father is 36 now, how old was the boy five years back ?

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Question: A father tells his son, “I was of your present age when you were born”. If the father is 36 now, how old was the boy five years back ?
[A].

13

[B].

15

[C].

17

[D].

20

Answer: Option A

Explanation:

Let the father’s age be x and the son’s age be y.

Then, x – y = y or x = 2y,

Now, x = 36. So, 2y = 36 or y = 18.

Therefore Son’s present age = 18 years.

So, son’s age 5 years ago = 13 years.

A is three times as old as B. C was twice-as old as A four years ago. In four years’ time, A will be 31. What are the present ages of B and C ?

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Question: A is three times as old as B. C was twice-as old as A four years ago. In four years’ time, A will be 31. What are the present ages of B and C ?
[A].

9, 46

[B].

9, 50

[C].

10, 46

[D].

10, 50

Answer: Option B

Explanation:

We have : A = 3B …(i) and

C – 4 = 2 (A – 4) …(ii)

Also, A + 4 = 31 or A= 31-4 = 27.

Putting A = 27 in (i), we get: B = 9.

Putting A = 27 in (ii), we get C = 50.

Latent heat of dry steam at atmospheric pressure is 539 Kcal/kg; which __________ with increase in the pressure of steam.

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Question: Latent heat of dry steam at atmospheric pressure is 539 Kcal/kg; which __________ with increase in the pressure of steam.
[A].

decreases

[B].

increases

[C].

remains same

[D].

may increase or decrease

Answer: Option A

Explanation:

No answer description available for this question.

Nitin’s age was equal to square of some number last year and the following year it would be cube of a number. If again Nitin’s age has to be equal to the cube of some number, then for how long he will have to wait?

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Question: Nitin’s age was equal to square of some number last year and the following year it would be cube of a number. If again Nitin’s age has to be equal to the cube of some number, then for how long he will have to wait?
[A].

10 years

[B].

38 years

[C].

39 years

[D].

64 years

Answer: Option B

Explanation:

Clearly, we have to first find two numbers whose difference is 2 and of which the smaller one is a perfect square and the bigger one a perfect cube.

Such numbers are 25 and 27.

Thus, Nitin is now 26 years old. Since the next perfect cube after 27 is 64,

so required time period = (64 – 26) years = 38 years.

Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the __________ temperature of air.

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Question: Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the __________ temperature of air.
[A].

wet bulb

[B].

dry bulb

[C].

saturation

[D].

dew point

Answer: Option A

Explanation:

No answer description available for this question.

He said to his father, “Please increase my pocket-money.”

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Question: He said to his father, “Please increase my pocket-money.”
[A].

He told his father, “Please increase the pocket-money”

[B].

He pleaded his father to please increase my pocket money.

[C].

He requested his father to increase his pocket-money.

[D].

He asked his father to increase his pocket-money.

Answer: Option C

Explanation:

No answer description available for this question.