Q:

Which word best describes the structure of the cell membrane?

A) Rigid	B) Impermeable
C) Nonpolar	D) Layered

Answer & Explanation Answer: D) Layered

Explanation:

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Q:

The number of electron levels in a magnesium atom is

A) 3	B) 2
C) 1	D) 0

Answer & Explanation Answer: A) 3

Explanation:

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Q:

An improvement in production technology will

A) shift the supply curve to the left	B) shift the demand curve to the left
C) shift the supply curve to the right	D) increase equilibrium price

Answer & Explanation Answer: C) shift the supply curve to the right

Explanation:

An improvement in production technology will shift the supply curve to the right.

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Q:

For an ideal gas, which one of the following statements does not hold true?

A) The speed of all gas molecules is same	B) The kinetic energies of all gas molecules are not same
C) The potential energy of the gas molecules is zero	D) There is no interactive force between the molecules.

Answer & Explanation Answer: A) The speed of all gas molecules is same

Explanation:

In an ideal gas, at any particular time, different particles in the gas have different speeds and hence different kinetic energies. This assumption is reasonable because as the particles collide, we expect their speed to change. Even if initial speed of all the particles was same, the molecular collisions will disrupt this uniformity.Hence statement 1 is incorrect and 2 is correct.

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Q:

Which one of the following physical quantities has the same dimensions as that of Planck’s constant h?

A) Linear momentum	B) Angular momentum
C) Force	D) Potential energy

Answer & Explanation Answer: B) Angular momentum

Explanation:

In S.I. System unit of angular momentum is "joule.Second".

SI unit of Planck's constant is joule-seconds(j-s).

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Q:

Which statement best characterizes animism?

A) It's the basis of social status within a tribe.	B) It combines natural, human, and spiritual forces.
C) It's a religion that maintains the futility of human existence.	D) It's composed of irrational superstitions that arise in underdeveloped rural communities.

Answer & Explanation Answer: B) It combines natural, human, and spiritual forces.

Explanation:

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Q:

Crystal size in igneous rocks is determined by

Answer

Crystal size in igneous rocks is determined by rate of cooling i.e, the time taken by magma to cool down.

Crystal_size_in_igneous_rocks_is_determined_by1554209716.jpg image

Hence, the slower the rate of cooling the larger the crystals. The faster the rate of cooling the smaller the crystals.

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Q:

The Second World War ended in

Answer

1945 AD

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Subject: World History

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