Q:

A boat loaded with rocks floats in the middle of a swimming pool. A man in the boat throws the rocks overboard. The level of water in the pool will

A) increase	B) decrease
C) remains the same	D) first decrease and then increase

Answer & Explanation Answer: B) decrease

Explanation:

Let M and m grams be the mass of boat + rock in it. By law of floatation(M+m) grams of water will be displaced. This has a volume of (M+m)cc. That means the level of water in pool has risen up by (M+m)cc with the boat + rock when it is floating. If the rocks in the boat are thrown not into the pool but outside, the weight left is only M grams the weight of the boat. This will have displaced M cc of water only i.e less water than in the case of loaded boat. But if the rocks are put in the water in the pool and not outside, then the water in the pool will rise not only by M cc on account of empty boat but also by a volume of the stone put into it. This volume will be $\frac{m}{d}$ where m is the mass of rock and d density of rock.

Now $\frac{m}{d}$ is < m. Thus the total rise will be $(M + \frac{m}{d})$ which is < M + m.

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Filed Under: Physics
Exam Prep: AIEEE , CAT
Job Role: Analyst

36 11723

Q:

According to Strabo, the Tamil kingdom to first send emissaries to meet Augustin in Athens in 20 BC, was

A) Pallava	B) Chola
C) Pandya	D) Chera

Answer & Explanation Answer: C) Pandya

Explanation:

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Filed Under: Indian History

6 11717

Q:

Choose the correctly spelt word

The threat of an epidemic caused great alarm and

A) Trepidation	B) Terpidation
C) Trepidition	D) Trepidattion

Answer & Explanation Answer: A) Trepidation

Explanation:

Trepidation is spelt correctly which means a feeling of fear or anxiety about something that may happen.

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Filed Under: English
Exam Prep: Bank Exams

1 11714

Q:

The term 'mixed economy' denoted

A) existence of both rural and urban sectors	B) existence of both private and public sectors
C) existence of both heavy and small industries	D) existence of both developed and underdeveloped sectors

Answer & Explanation Answer: B) existence of both private and public sectors

Explanation:

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Filed Under: Indian Economy

15 11706

Q:

Which of the following pairs is INCORRECT?

I. Haematite : Iron

II. Pitchblende : Copper

III. Monazite : Thorium

A) Only I	B) Only II
C) Only I and Only II	D) Only I and Only III

Answer & Explanation Answer: B) Only II

Explanation:

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Filed Under: Chemistry
Exam Prep: Bank Exams

0 11703

Q:

Improve the bracketed part of the sentence.

I won't be able to leave for office until they (arrive).

A) have arrived	B) had arrived
C) will have arrived	D) no improvement

Answer & Explanation Answer: A) have arrived

Explanation:

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Filed Under: English
Exam Prep: Bank Exams

0 11691

Q:

Improve the bracketed part of the sentence.

Election was an ‘opinion minus democracy’ in which the innocent and helpless (people were pitted among) government’s muscle power State machinery.

A) people were pitted against	B) people are pitted against
C) people would pitted against	D) No improvement

Answer & Explanation Answer: A) people were pitted against

Explanation:

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Filed Under: English
Exam Prep: Bank Exams

0 11689

Q:

Improve the bracketed part of the sentence.

By the end of this decade, doctors surely (must have discover) a cure for cancer.

A) would have discovered	B) could discover
C) have discovered	D) no improvement

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