Q:

Which compound contains ionic bonds?

A) CaO	B) CO2
C) NO2	D) NO

Answer & Explanation Answer: A) CaO

Explanation:

An ionic bond is a chemical bond between two atoms in which one atom seems to donate its electron to another atom.

Here in the given compounds, the compound that contains ionic bond is CaO, Calcium oxide.

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0 3006

Q:

Teens who drink are at risk of

A) HIV and other STDs	B) becoming an alcoholic
C) date rape	D) All of the above

Answer & Explanation Answer: D) All of the above

Explanation:

teens_drinking_are_at_risk_of1539257520.jpg image

Teens drinking are at risk of date rape, becoming an alcoholic, HIV and other STDs.

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1 3005

Q:

Which subatomic particle has no charge?

A) electron	B) neutron
C) proton	D) All of the above

Answer & Explanation Answer: B) neutron

Explanation:

An atom is composed of three subatomic particles. They are ::

1) Electron (-vely charged particle)

2) Proton (+vely charged particle)

3) Neutron (No charge particle)

Hence, Neutron is the subatomic particle which has no charge.

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2 3004

Q:

Which kind of energy is stored in a chemical bond?

A) Potential energy	B) Kinetic energy
C) Both A & B	D) None of the above

Answer & Explanation Answer: A) Potential energy

Explanation:

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0 3004

Q:

A seven letter word containing thousands of letters is what?

Answer

It is a Postbox or a Mailbox which contains thousands of letters or mails or messages.

Workspace

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1 3004

Q:

In a computer game, a builder can build a wall in ten hours while a destroyer can demolish such a wall completely in fourteen hours. Both, the builder and the destroyer were initially set to work together on level ground. But after 7 hours the destroyer was taken out. What was the total time (in hrs) taken to build the wall ?

A) 17	B) 15
C) 24	D) 35

Answer & Explanation Answer: B) 15

Explanation:

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5 3003

Q:

Removal of oil and grease from sewage [waste water]

A) Skimming	B) Filtration
C) Screening	D) None of the above

Answer & Explanation Answer: A) Skimming

Explanation:

Skimming is the removal of any material or particles that are floating on the surface. Hence, Removal of oil and grease from sewage - waste water is called as skimming.

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4 3003

Q:

What is the heat generated (in J) in a heating element of resistance 900 $Ω$ when a current of 0.3 A passes through it for 10 seconds?

A) 2700	B) 810
C) 405	D) 1350

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