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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18 8105

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 8102

Q:

Choose the antonym of

stun

A) petrify	B) calm
C) flabbergast	D) stupefy

Answer & Explanation Answer: B) calm

Explanation:

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Q:

What is the purpose of adding Gypsum to the cement?

A) For lubrication	B) To slow down its rate of setting
C) To increase its rate of setting	D) To make it strong

Answer & Explanation Answer: B) To slow down its rate of setting

Explanation:

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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 $120^{0} C$ for 2-3 hours.

Vulcanised rubber is a vastly improved product.

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9 8090

Q:

Select the antonym of

to muster

A) to convocate	B) to rally
C) to estrange	D) to aggregate

Answer & Explanation Answer: C) to estrange

Explanation:

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Q:

During Kargil War, Who was the Indian Army chief of staff ?

A) Ved Prakash Malik	B) Sankar Roy Chowdary
C) Nirmal chandar Vij	D) Sundar rajan Padmanabhan

Answer & Explanation Answer: A) Ved Prakash Malik

Explanation:

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37 8085

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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6 8079

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