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Q:

Two boys starting from the same place walk at a rate of 5kmph and 5.5kmph respectively. What time will they take to be 8.5km apart, if they walk in the same direction?

A) 15 hours	B) 16 hours
C) 17 hours	D) 18 hours

Answer & Explanation Answer: C) 17 hours

Explanation:

In this type of questions we need to get the relative speed between them,
The relative speed of the boys = 5.5kmph – 5kmph
= 0.5 kmph

Distance between them is 8.5 km
Time = Distance/Speed
Time= 8.5km / 0.5 kmph = 17 hrs

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Filed Under: Time and Distance
Exam Prep: GRE

Q:

A man in a train notices that he can count 41 telephone posts in one minute. If they are known to be 50 metres apart, then at what speed is the train travelling?

A) 60 km/hr	B) 100 km/hr
C) 110 km/hr	D) 120 km/hr

Answer & Explanation Answer: D) 120 km/hr

Explanation:

Number of gaps between 41 poles = 40
So total distance between 41 poles = 40*50
= 2000 meter = 2 km
In 1 minute train is moving 2 km/minute.
Speed in hour = 2*60 = 120 km/hour

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Filed Under: Time and Distance
Exam Prep: GRE

Q:

The atoms of the elements having same mass number but different atomic number are called

A) Isotopes	B) Isobars
C) Isotones	D) Isomers

Answer & Explanation Answer: B) Isobars

Explanation:

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Filed Under: Chemistry

Q:

A radioactive substance has a half life of four months, three-fourth of the substance would decay in

A) 3 months	B) 4 months
C) 8 months	D) 12 months

Answer & Explanation Answer: C) 8 months

Explanation:

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Filed Under: Chemistry

Q:

Artificial radioactivity elements are present in

A) s - block	B) p - block
C) d - block	D) f - block

Answer & Explanation Answer: D) f - block

Explanation:

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Filed Under: Chemistry

Q:

A, B, C, D, E, F and G are members of a family consisting of four adults and three children, two of whom, F and G are girls. A and D are brothers and A is a doctor. E is an engineer married to one of the brothers and has two children. if is married to D and G is their child. Who is C ?

A) A's son	B) E's daughter
C) F's father	D) G's brother

Answer & Explanation Answer: A) A's son

Explanation:

E is mamed to A or D. But B is marned to D. Thus, E is married to A.

Thus, A, B, C, D, E are the four adults and C, F, G are the three children in the family. B and D have a child G. A and E have two children. They are C and F Now. only F and G are girls.

So, C is a boy. Thus, C is A's or E's son.

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Filed Under: Blood Relations

Q:

If the ratio of two squares is 225:256,then the ratio of the perimeters is

A) 25:16	B) 15:16
C) 16:15	D) 17:16

Answer & Explanation Answer: B) 15:16

Explanation:

$\frac{a^{2}}{b^{2}} = 225 / 256$

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Filed Under: Area
Exam Prep: Bank Exams
Job Role: Bank PO

Q:

If the length of the diagonal of a square is 20cm,then its perimeter must be

a. $40 \sqrt{2}$ cm b. $30 \sqrt{2}$ cm c. 10cm d. 15 $\sqrt{2}$ cm

A) a	B) b
C) c	D) d

Answer & Explanation Answer: A) a

Explanation:

We know that d=√2s

Given diagonal = 20 cm

=> s = 20/ $\sqrt{2}$ cm

Therefore, perimeter of the square is 4s = 4 x 20/ $\sqrt{2}$ = 40 $\sqrt{2}$ cm.

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Filed Under: Area
Exam Prep: Bank Exams
Job Role: Bank PO

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