Q:

A bucket of water is hung from a spring balance. A piece of iron is suspended in the water without touching the sides or touching the bottom of the the bucket. The reading of the spring balance

A) will increase	B) will decrease
C) does not change	D) varies with the increase of depth of the immersion of the iron piece

Answer & Explanation Answer: A) will increase

Explanation:

When the piece of iron is lowered into the water, the water level in the bucket increases. And so the pressure at the bottom of bucket also increases. Thus the total thrust at bottom also increases. Therefore the spring balance reading increases. Thus (a) is correct.

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Filed Under: Physics

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Q:

Which action is the best example of a direct observation?

A) listening to a cricket chirp at night and counting the number of chirps per minute	B) determining the seal population of an island by counting seals in 10 square meters of the island
C) identifying which bird was present by the tracks that it leaves in the sand at a beach	D) reading numbers on a heat sensor to conclude that there is a deer in the night woods

Answer & Explanation Answer: A) listening to a cricket chirp at night and counting the number of chirps per minute

Explanation:

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Filed Under: General Science
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4 3581

Q:

Fat can be seperated from milk in a cream seperator because of :

A) Cohesive Force	B) Gravitational Force
C) Centripetal Force	D) Centrifugal Force

Answer & Explanation Answer: D) Centrifugal Force

Explanation:

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Filed Under: Physics

6 3580

Q:

A series of fast moving still pictures can be made to appear as a moving picture because the eye

A) can focus very rapidly as pictures change	B) is quicker than the brain
C) can see 2 images separated only if the interval betwen seeing them is more than one-tenth of a second	D) can shut out some of the light

Answer & Explanation Answer: C) can see 2 images separated only if the interval betwen seeing them is more than one-tenth of a second

Explanation:

The eye can see images separately only if they are exhibited at an interval of more than 1/10 of a second. In the case of a movie, the still pictures come one after the other at less than this minimum interval. So we do not see them separately but only as a continuous moving picture.

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Q:

Which statement best describes electrons?

A) Electrons orbit around the nucleus	B) Electrons are composed of protons and neutrons
C) Electrons reside in the nucleus	D) Electrons have a positive charge

Answer & Explanation Answer: A) Electrons orbit around the nucleus

Explanation:

Electrons orbit around the nucleus is correct about them.

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Filed Under: Chemistry
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Q:

A hunter on the ground wishes to shoot a bird on a tree at a distance with his rifle. He has to point the rifle

A) at the lower alevation than the bird	B) at a higher alevation than the bird
C) In the same direction as the bird	D) vertically upwards

Answer & Explanation Answer: B) at a higher alevation than the bird

Explanation:

The trajectory of the bullet is a parabola

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Filed Under: Physics

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Q:

The capital of Colombia is ?

A) Caracas	B) Santiago
C) Lima	D) Bogota

Answer & Explanation Answer: D) Bogota

Explanation:

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Filed Under: World Geography
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9 3579

Q:

How much water can be used by a camel in drinking in a single time ?

A) Up to 60 ltr.	B) Up to 100 ltr.
C) Up to 80 ltr.	D) Up to 120 ltr.

Answer & Explanation Answer: B) Up to 100 ltr.

Explanation:

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Filed Under: Animals and Birds
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