Questions

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

Explanation:
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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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Q:

Which metal pollute the air of a big city?

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

Explanation:
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Q:

Rearrange the parts of the sentence in correct order.

Senior officials
P - ­to negotiate a solution
Q - ­readiness
R­ - have signalled China's

A) QRP B) RQP
C) PRQ D) PQR
 
Answer & Explanation Answer: B) RQP

Explanation:
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Q:

Improve the bracketed part of the sentence.

 

Let us hurry, or else the bus (will be leaving) the stop by the time we reach there.

 

A) will leave B) will have left
C) would have left D) no improvement
 
Answer & Explanation Answer: B) will have left

Explanation:
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Q:

Velocitation is the tendency to

A) be traveling at a speed that is faster than perceived B) be traveling at a speed that is slower than perceived
C) Both A & B D) None of the above
 
Answer & Explanation Answer: A) be traveling at a speed that is faster than perceived

Explanation:

Velocitation is a phenomenon caused by driving for long periods at high speeds. A driver may experience velocitation when coming off of the highway; the change in speed makes him or her think that the car is going much slower than it actually is.

 

Velocitation is the tendency to be traveling at a speed that is faster than perceived.

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Q:

The main element used in the vulcanisation of rubber is

A) nickel B) copper
C) sulphur D) graphite
 
Answer & Explanation Answer: C) sulphur

Explanation:

In vulcanization, cruder rubber is heated with 3% sulphur at about for 1200C for 2-3 hours.

Vulcanised rubber is a vastly improved product.

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Q:

World Wide Web is being standard by

A) W3C B) World Wide Web Standard
C) Worldwide corporation D) World Wide Consortium
 
Answer & Explanation Answer: A) W3C

Explanation:

World Wide Web is being standard by W3C.

 

The World Wide Web Consortium (W3C) is an international community where Member organizations, a full-time staff, and the public work together to develop Web standards. Led by Web inventor and Director Tim Berners-Lee and CEO Jeffrey Jaffe, W3C's mission is to lead the Web to its full potential.

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