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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Filed Under: Chemistry
Exam Prep: AIEEE , GATE

9 8200

Q:

What is the position of metallic ion and non-metallic ion in a chemical formula?

A) Metal ion at second position	B) Non-metal ion at first position
C) Metal ion at first and non-metal ion at second position	D) No option is correct

Answer & Explanation Answer: C) Metal ion at first and non-metal ion at second position

Explanation:

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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 8196

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 8193

Q:

The oldest dynasty still ruling in which country ?

A) India	B) Iran
C) Japan	D) England

Answer & Explanation Answer: C) Japan

Explanation:

The longest-surviving dynasty in the world is the Imperial House of Japan.

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21 8192

Q:

Dronacharya Award Is Given To

A) Sports Editors	B) Umpires
C) Sportsmen	D) Coaches

Answer & Explanation Answer: D) Coaches

Explanation:

The Dronacharya Award, formally known as Dronacharya Award for Outstanding Coaches in Sports and Games, is sports training honour of the Republic of India. The award is named after Drona, often referred as "Dronacharya" or "Guru Drona", a character from the Sanskrit epic Mahabharata of ancient India.

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15 8190

Q:

The effects of any drug depend on

A) The amount taken at one time	B) The circumstances under which the drug is taken such as the simultaneous use of alcohol or other drugs, etc.
C) How the drug is consumed	D) All the above

Answer & Explanation Answer: D) All the above

Explanation:

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Filed Under: Biology
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3 8189

Q:

Which of the statements given below are correct?

A) Rafael Nadal won the Tennis 2017 Wimbledon Championships Men's Singles.

B) Aryan Tari won the 2017 World Junior Chess Championship.

C) Viktor Axelsen won the Men's Singles Badminton 2017 BWF World Championships.

A) Only A	B) Only B
C) Both B and C	D) None of these

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