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Q:

The average age of eight teachers in a school is 40 years. A teacher among them died at the age of 55 years whereas another teacher whose age was 39 years joins them. The average age of the teachers in the school now is (in years)

A) 35	B) 36
C) 38	D) 39

Answer & Explanation Answer: C) 38

Explanation:

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Filed Under: Problems on Ages
Exam Prep: Bank Exams

Q:

Which one of the following is the value of one nanometer?

A) 10-7 cm	B) 10-6 cm
C) 10-4 cm	D) 10-3 cm

Answer & Explanation Answer: A) 10-7 cm

Explanation:

1 nanometer (nm) of length

Equals: 0.00000010 centimetres (cm) in length.

This is equal to 10^-7 cm.

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Filed Under: Physics
Exam Prep: Bank Exams

Q:

Sound waves can not travel through a

A) copper wire placed in air	B) silver slab placed in air
C) glass prism placed in water	D) wooden hollow pipe placed in vacuum

Answer & Explanation Answer: D) wooden hollow pipe placed in vacuum

Explanation:

Sound is a kind of energy created when something vibrates. When this vibration reaches an ear, it is translated into what we recognize as a sound. Sound vibration must travel through matter. Therefore, it can travel through air and water but not through vacuum.

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Filed Under: Physics
Exam Prep: Bank Exams

Q:

One number is 25% of another number. The larger number is 12 more than the smaller. The large number is

A) 48	B) 16
C) 4	D) 12

Answer & Explanation Answer: B) 16

Explanation:

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Filed Under: Problems on Numbers
Exam Prep: Bank Exams

Q:

Consider the following chemical reaction :

${aFe}_{2} O_{3} (s) + bCO (g) + cFe (s) + {dCO}_{2}$

In the balanced chemical equation of the above, which of the following will be the values of the coefficients a, b, c and d respectively?

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

Answer & Explanation Answer: B) 1, 3, 2, 3

Explanation:

Fe2O3 + 3CO = 2Fe + 3CO2

Hematite + Carbon Monoxide = Iron + Carbon Dioxide

In this reaction, the iron oxide is reduced to iron, and the carbon is oxidised to carbon dioxide.

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Filed Under: Chemistry
Exam Prep: Bank Exams

Q:

In terms of economics, if it is possible to make someone betteroff without making someone worseoff, then the situation is

A) Inefficient	B) Efficient
C) Optimal	D) Paretosuperior

Answer & Explanation Answer: D) Paretosuperior

Explanation:

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Filed Under: Indian Economy
Exam Prep: Bank Exams

Q:

A man starts running from point P at 11:00 a.m. with a speed of 10 km/hr. He runs for 2 hours and then takes a 1 hour rest. He continues this till he is caught by another man who starts at 2:00 p.m. from point P and runs non-stop at a speed of 15 km/hr towards the first man. At what time (in p.m.) will the first man be caught?

A) 6:20	B) 4:40
C) 6:00	D) 5:30

Answer & Explanation Answer: B) 4:40

Explanation:

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Filed Under: Time and Distance
Exam Prep: Bank Exams

Q:

If A/3 = B/2 = C/5, then what is the value of ratio ${(C + A)}^{2} : {(A + B)}^{2} : {(B + C)}^{2} ?$

A) 9 : 4 : 25	B) 25 : 4 : 9
C) 64 : 25 : 49	D) 49 : 25 : 64

Answer & Explanation Answer: C) 64 : 25 : 49

Explanation:

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Filed Under: Simplification
Exam Prep: Bank Exams

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