Exams Questions and Answers

Q:

A can do 1/2 of a piece of work in 8 days while B can do1/3of the same work in 8 days. In how many days can both do it together?

A) 9.6 days	B) 10.5 days
C) 11.2 days	D) 16 days

Answer & Explanation Answer: A) 9.6 days

Explanation:

A completed their work in 8 X 2 = 16 days

B completed their work in 8 X 3 = 24 days

A and B one day work1/16 + 1/245/48

A and B completed their work in 48/5 days = 9.6 days

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Filed Under: Time and Work
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Q:

Compressions and Rarefactions are characteristic of

A) Longitudinal waves	B) Transverse waves
C) Both A & B	D) Neither of A & B

Answer & Explanation Answer: A) Longitudinal waves

Explanation:

Compressions and Rarefactions are characteristic of Longitudinal waves.

The direction of vibration of the particles is in the same plane as in which the wave is propagating. The particles vibrate back and forth, about their mean positions.

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Filed Under: Physics
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Q:

From a group of 7 boys and 6 girls, five persons are to be selected to form a team, so that at least 3 girls are there in the team. In how many ways can it be done?

A) 427	B) 531
C) 651	D) 714

Answer & Explanation Answer: B) 531

Explanation:

Given in the question that, there are 7 boys and 6 girls.

Team members = 5

Now, required number of ways in which a team of 5 having atleast 3 girls in the team =

$(6 C_{3} x 7 C_{2}) + (6 C_{4} x 7 C_{1}) + (6 C_{5}) = [\frac{6 x 5 x 4}{3 x 2 x 1} x \frac{7 x 6}{2 x 1}] + [\frac{6 x 5 x 4 x 3}{4 x 3 x 2 x 1} x 7] + [\frac{6 x 5 x 4 x 3 x 2}{5 x 4 x 3 x 2 x 1}] = 420 + 105 + 6 = 531 .$

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Filed Under: Permutations and Combinations
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Q:

The term Hassles refers to

A) major annoyances of everyday life	B) personal limitations that make it impossible for someone to pursue a desired goal
C) to interact with persons we dislike in order to obtain our goals	D) minor annoyances of everyday life

Answer & Explanation Answer: D) minor annoyances of everyday life

Explanation:

The term Hassles refers to minor annoyances of everyday life.

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Filed Under: English
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Q:

Identify the diagram that best represents the relationship among the given classes.
Bull, Animal, Carnivorous

A) 1	B) 2
C) 3	D) 4

Answer & Explanation Answer: D) 4

Explanation:

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Filed Under: Logical Venn Diagram
Exam Prep: Bank Exams

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Q:

Consider the given statement and decide which of the given assumptions is/are implicit.

Statement :

Kindly check the availability of one ticket from Tumkur to Mangalore.

Assumptions :

1. The person who is checking knows the mode of transport.

2. The person who is checking knows the passenger who is travelling very well.

A) Only assumption 1 is implicit	B) Only assumption 2 is implicit
C) Either assumption 1 or 2 is implicit	D) Both assumptions 1 and 2 are implicit

Answer & Explanation Answer: A) Only assumption 1 is implicit

Explanation:

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Filed Under: Statement and Assumptions
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Q:

A steamer moves with a speed of 4.5 km/h in still water to a certain upstream point and comes back to the starting point in a river which flows at 1.5 km/h. The average speed of steamer for the total journey is

A) 12 km/h	B) 10 km/h
C) 6 km/h	D) 4 km/h

Answer & Explanation Answer: D) 4 km/h

Explanation:

Speed of streamer = 4.5 km/hrSpeed of water = 1.5 km/hr

Downstream speed = 4.5+1.5 = 6 km/hr

Upstream speed = 4.5 -1.5 = 3 km/hr

Average Speed = (6 X 3) / 4.5 = 4km/hr

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Filed Under: Boats and Streams
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Q:

Where does hydroelectric energy come from?

A) Air	B) Water
C) Solar	D) All of the above

Answer & Explanation Answer: B) Water

Explanation:

Hydroelectricity is electricity produced from hydropower i.e, water.

Where_does_hydroelectric_energy_come_from1536043070.jpg image

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Filed Under: Physics
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