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Q:

A sum of money lent at compound interest for 2 years at 20% per annum would fetch Rs.482 more, if the interest was payable half yearly than if it was payable annually . The sum is

A) 10000	B) 20000
C) 40000	D) 50000

Answer & Explanation Answer: B) 20000

Explanation:

Let sum=Rs.x

C.I. when compounded half yearly = $[x {(1 + \frac{10}{100})}^{4} - x] = \frac{4641}{10000}$

C.I. when compounded annually = $[x {(\frac{20}{100})}^{2} - x] = \frac{11}{25}$

$\frac{4641}{10000} x - \frac{11}{25} x = 482$

=> x=20000

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Filed Under: Compound Interest
Exam Prep: Bank Exams
Job Role: Bank PO

Q:

An element X forms an oxide $XO_{_{3}}$ , what ihe valency of X

A) 1	B) 2
C) 3	D) 6

Answer & Explanation Answer: D) 6

Explanation:

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Filed Under: Chemistry

Q:

Which one of the following elements is the poorest conductor of heat

A) sodium	B) lead
C) zinc	D) mercury

Answer & Explanation Answer: B) lead

Explanation:

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Filed Under: Chemistry

Q:

Which one among the following is the heaviest

A) 1 mole of water molecules	B) 1 mole of ammonia molecules
C) 1 mole of sodium atoms	D) 1 mole of hydrogen molecules

Answer & Explanation Answer: C) 1 mole of sodium atoms

Explanation:

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Filed Under: Chemistry

Q:

How many electrons are there in Na+

A) 1	B) 10
C) 11	D) 12

Answer & Explanation Answer: B) 10

Explanation:

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Filed Under: Chemistry

Q:

Which one of the following substances does not have a melting point

A) bromine	B) sodium chloride
C) mercury	D) glass

Answer & Explanation Answer: D) glass

Explanation:

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Filed Under: Chemistry

Q:

Which one of the following mixture is homogeneous

A) starch and sugar	B) methanol and water
C) graphite and charcoal	D) calcium carbonate and calcium bicarbonate

Answer & Explanation Answer: B) methanol and water

Explanation:

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Filed Under: Chemistry

Q:

Which of the following is an element

A) alumina	B) brass
C) graphite	D) silicon

Answer & Explanation Answer: D) silicon

Explanation:

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Filed Under: Chemistry

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