Q:

Atoms of the same element can differ in

A) Atomic number	B) Atomic mass
C) electrons	D) None of the above

Answer & Explanation Answer: B) Atomic mass

Explanation:

Atoms of the same element can have same atomic number and number of electrons since, the atomic number is the number of protons and the number of protons and eectrons are the same in an element.

Hence, the atoms of the same element may differ in their atomic mass since it depends on the number of neutrons it holds and such atoms are called isotopes.

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Q:

Thermohaline circulation is mainly due to

A) cold, dense ocean water sinking and warmer water replacing it	B) winds causing circulation of ocean water
C) warmer, less dense water sinking in the ocean and cold water replacing it	D) warm water being added to the ocean due to industial waste

Answer & Explanation Answer: A) cold, dense ocean water sinking and warmer water replacing it

Explanation:

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Q:

The magnitude of buoyant force depends on the .......... of the fluid.

A) mass	B) temperature
C) volume	D) density

Answer & Explanation Answer: D) density

Explanation:

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Q:

Oxygen released during photosynthesis comes from

A) Sugar	B) Water
C) Co2	D) Pyruvic acid

Answer & Explanation Answer: B) Water

Explanation:

Oxygen released during photosynthesis comes from splitting of water.

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Q:

Molten rock inside the earth is called

A) Mantle	B) Core
C) Magma	D) Lava

Answer & Explanation Answer: C) Magma

Explanation:

Molten rock inside the earth is called Magma.

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Q:

To keep warm, polar bears have a layer of ________ under their skin.

A) muscle	B) fat
C) cartilage	D) hair

Answer & Explanation Answer: B) fat

Explanation:

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Q:

Buckingham palace became the official royal residence during the reign of which British monarch?

A) Queen Victoria	B) King George III
C) King Henry VIII	D) King George V

Answer & Explanation Answer: A) Queen Victoria

Explanation:

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Q:

If i wanted to reach the South Atlantic from the South Pacific while touching South America , I would have to use

A) Florida Straits	B) Dardaelles
C) Magellan Straits	D) Bosporus

Answer & Explanation Answer: C) Magellan Straits

Explanation:

a) joins the Gulf of Mexico and Atlantic Ocean, and touches USA and Bahama Island.

b) joins the sea of Marmara and Aegean Sea, touching Asian Turckey and European Turkey

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