Questions

Q:

Select the synonym of

gripe

A) To grieve B) To grasp
C) To flatter D) To hold
 
Answer & Explanation Answer: A) To grieve

Explanation:
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0 8120
Q:

What value should come in place of the question mark (?) in the following question?

325-122+75=?2-68

A) 18 B) 324
C) 18 D) 3242
 
Answer & Explanation Answer: C) 18

Explanation:

?2 = 325 – 144 + 75 + 68
= 468 – 144 = 324
(?) = 18,-18

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0 8114
Q:

Which metal pollute the air of a big city?

A) Chromium B) Lead
C) Copper D) Zinc
 
Answer & Explanation Answer: B) Lead

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12 8111
Q:

Which solution has the highest pH?

A) 50.0 mL 0.0500 M calcium hydroxide, Ca(OH)2 (aq) B) 50.0 mL 0.0500 M sodium hydroxide, NaOH (aq)
C) 50.0 mL 0.0500 M nitric acid, HNO3 (aq) D) 50.0 mL 0.0500 M nitrous acid, HNO2 (aq)
 
Answer & Explanation Answer: A) 50.0 mL 0.0500 M calcium hydroxide, Ca(OH)2 (aq)

Explanation:

50.0 mL 0.0500 M calcium hydroxide, Ca(OH)2 (aq) has the highest pH value.

Sodium hydroxide and Calcium hydroxide are strong bases so they completely ionize in solution. Because they ionize at the same rate, and Calcium hydroxide has the higher pH calculated, then Calcium hydroxide, in fact, has the highest pH.

Nitric acid is a strong acid, so it completely ionizes in water. Whilst nitrous acid is a weak acid. Therefore, the nitric acid solution has the LOWEST ph.

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8 8110
Q:

Secondary storage ________

A) does not require constant power B) does not use magnetic media
C) consists of four main types of devices D) does not store information for later retrieval
 
Answer & Explanation Answer: A) does not require constant power

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18 8109
Q:

Sound waves cannot travel in

A) Vacuum B) Water
C) Glass D) Hydrogen gas
 
Answer & Explanation Answer: A) Vacuum

Explanation:

A Sound wave needs a medium for propogation. Hence, Sound cannot travel through a vacuum.

A vacuum is an area without any air, like space. So sound cannot travel through space because there is no matter for the vibrations to work in.

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Filed Under: Physics
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6 8100
Q:

Who expanded the cell theory and suggested that all the cells arise from pre-existing cells?

 

A) T. Schwann B) M. Schleiden
C) J. E. Purkinje D) Rudolf Virchow
 
Answer & Explanation Answer: D) Rudolf Virchow

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Filed Under: Biology
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0 8099
Q:

The mass of one molecule of oxygen is

 

A) 2.3 x 10-23 g B) 3.3 x 10-23 g
C) 4.3 x 10-23 g D) 5.3 x 10-23 g
 
Answer & Explanation Answer: D) 5.3 x 10-23 g

Explanation:
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4 8097