Q:

Which of the following substances cause temporary hardness in water?

1. Mg(HCO3)2

2. Ca(HCO3)2

3. CaCl2

4. MgSO4

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

Answer & Explanation Answer: D) 1 and 2

Explanation:

There are two types of water hardness: temporary and permanent hardness. Temporary hardness is due to the presence of calcium hydrogen carbonate Ca(HCO3)2(aq) and magnesium hydrogen carbonate Mg(HCO3)2(aq).

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Filed Under: Chemistry
Exam Prep: Bank Exams

0 14154

Q:

A periscope works by the principle of

A) Total internal reflection	B) Refraction
C) Diffraction	D) Reflection & Refraction

Answer & Explanation Answer: A) Total internal reflection

Explanation:

A periscope is an optical instrument that uses a system of prisms, lenses, or mirrors to reflect images through a tube.

per11526634345.jpg image

Light from a distant object strikes the top mirror and is then reflected at an angle of 90 degrees down the periscope tube. At the bottom of the periscope, the light strikes another mirror and is then reflected into the viewer’s eye.

Hence, A periscope works by the principle of Total internal reflection.

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Filed Under: Physics
Exam Prep: GATE , CAT , Bank Exams , AIEEE
Job Role: Bank PO , Bank Clerk , Analyst

37 14140

Q:

Who wrote a book describing the theory of economic drain of India during British rule

A) Late lajpat rai	B) Mahatma Gandhi
C) Jawaharlal nehru	D) Dadabhai naoroji

Answer & Explanation Answer: D) Dadabhai naoroji

Explanation:

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Filed Under: Indian Economy

23 14138

Q:

What is page cannibalizing?

Answer

Page swapping or page replacements are called page cannibalizing.

Workspace

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Subject: Operating Systems

22 14132

Q:

Two cubes have their volumes in the ratio 1 : 27. Find the ratio of their surface areas.

A) 2:9	B) 3:9
C) 1:9	D) 4:9

Answer & Explanation Answer: C) 1:9

Explanation:

Let their edges be a and b. Then,

a3/b3 = 1/27 (or) (a/b)3 = (1/3)3 (or) (a/b) = (1/3).

\Ratio of their surface area = 6a2/6b2 = a2/b2 = (a/b)2 = 1/9, i.e. 1:9.

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Filed Under: Quantitative Aptitude - Arithmetic Ability

31 14129

Q:

Improve the bracketed part of the sentence.

As management we are accountable (to) the Board of Directors.

A) towards	B) with
C) against	D) no improvement

Answer & Explanation Answer: D) no improvement

Explanation:

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Filed Under: English
Exam Prep: AIEEE , Bank Exams , GRE

0 14123

Q:

Rearrange the parts of the sentence in correct order.

P: Added to this is their economic dissatisfaction.
Q: The youth get frustrated when they see a great deal of disparity between the theory and its application.
R: All these factors blend together and give rise to a cult of violence.
S: This causes them to wonder whether all that they ever learnt would overcome in use or would go waste.

A) QSPR	B) QPRS
C) QSRP	D) SPQR

Answer & Explanation Answer: A) QSPR

Explanation:

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Filed Under: English
Exam Prep: Bank Exams

0 14120

Q:

Which of the following group is NOT Dobereiner Triads?

A) Li, Na, K	B) N, P Au
C) Cl, Br, I	D) Ca, Sr, Ba

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